JP2022185496A - Abnormality determination apparatus - Google Patents

Abstract

To suppress the occurrence of erroneous determination in monitoring control for changing shift ranges of a vehicle.SOLUTION: An abnormality determination apparatus includes a first microcomputer and a second microcomputer, which respectively execute controls in accordance with an operation of a switch for changing shift ranges of a vehicle, the second microcomputer executing monitor control for determining whether an abnormality has occurred. In the case of detecting an event where change control for switching the shift range to a shift range corresponding to the switch is executed by the first microcomputer during a period between an input state of a signal input from the switch and a passage of a given period of time, the second microcomputer determines to be normal; whereas in the case of detecting an event where the change control for switching the shift range to a shift range corresponding to the switch is executed by the first microcomputer after the given period of time has elapsed since the input state of the signal changed, the second microcomputer determines to be abnormal.SELECTED DRAWING: Figure 3

Description

The present invention relates to an abnormality determination device.

In Patent Document 1, when a vehicle control device controls shift range change, it is determined whether shift range change control is normally performed using calculation results by a main microcomputer and calculation results by a sub-microcomputer. It is disclosed to determine whether

JP 2013-23859 A

In the configuration described in Patent Document 1, it is determined whether or not the control shift range calculated by the main microcomputer and the comparison shift range calculated by the sub-microcomputer match. However, the main microcomputer and the sub-microcomputer do not necessarily execute processing in the same calculation cycle. Therefore, due to the difference in the operation cycle of each microcomputer, only the shift range for control is switched when the shift range for comparison does not change, or only the shift range for comparison is switched when the shift range for control does not change. can happen. In other words, if each microcomputer outputs a calculation result judged to be normal, but the output timing is shifted due to a difference in the calculation cycle, and it is judged that the shift range for control and the shift range for comparison do not match. , there is a risk of erroneous determination that an abnormality has occurred.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an abnormality determination device capable of suppressing the occurrence of an erroneous determination of an abnormality when monitoring control for changing the shift range of a vehicle. for the purpose.

The present invention includes a first microcomputer and a second microcomputer that respectively execute control according to the operation of the switch for changing the shift range of the vehicle when the switch is operated. When the switch is operated, based on a signal input from the switch, change control is performed to switch the shift range to a shift range corresponding to the switch, and the second microcomputer controls the signal input from the switch. and a signal input from the first microcomputer, wherein the second microcomputer executes monitoring control to determine whether an abnormality has occurred, based on the signal input from the switch setting a permission time for permitting a change to the shift range corresponding to the switch when the input state of the switch changes; When it is detected that change control for switching the shift range to the shift range corresponding to the switch has been executed, it is determined to be normal, and after the permission time has passed since the input state changed, the first It is characterized in that when it is detected that the microcomputer has executed change control to switch the shift range to the shift range corresponding to the switch, it is determined that there is an abnormality.

According to this configuration, the first microcomputer controls the change to the shift range corresponding to the switch from when the input state of the signal input from the switch to the second microcomputer changes until the permission time elapses. If executed, it can be determined that the second microcomputer is normal. By setting the permission time in this way, it is determined that the change of the shift range performed during the permission time is normal. It is possible to suppress erroneous determination as abnormal.

Further, the second microcomputer detects that the first microcomputer has executed change control to switch to the shift range corresponding to the switch when the input state of the signal input from the switch has not changed. If so, it may be tentatively determined to be abnormal.

According to this configuration, when the first microcomputer executes change control to the shift range corresponding to the switch before the input state of the signal input from the switch to the second microcomputer changes, the second The microcomputer can make a provisional determination of abnormality.

Further, when the second microcomputer temporarily determines that there is an abnormality, it sets a predetermined grace period. If the input state of the switch changes, the temporary determination is canceled, and if the input state of the signal input from the switch does not change during the period from the temporary determination of abnormality until the grace period elapses, it is determined to be abnormal. You can judge.

According to this configuration, by providing a predetermined grace period after the provisional determination, it is possible to cancel the provisional determination before the grace period has elapsed and to determine the abnormality determination after the grace period has elapsed. As a result, the occurrence of erroneous determination can be suppressed.

The present invention includes a first microcomputer and a second microcomputer that respectively execute control according to the operation of the switch for changing the shift range of the vehicle when the switch is operated. When the switch is operated, based on a signal input from the switch, change control is performed to switch the shift range to a shift range corresponding to the switch, and the second microcomputer controls the signal input from the switch. and a signal input from the first microcomputer, wherein the switch comprises a normally open contact and a normally closed contact. and controls the on and off of the switch according to the signal output from each contact, and the second microcomputer is in a state where all the signals input from each contact of the switch are off. continues for a predetermined period of time or more, if it is detected that all the signals input to the first microcomputer from each contact of the switch are off, the wire provided between the switch and each microcomputer When it is determined that there is an abnormality in the harness or the switch, and the state in which all the signals input from the switch are off continues for a predetermined time or longer, the signal input from the switch to the first microcomputer is It is characterized by determining that an abnormality has occurred in the input circuit of the second microcomputer when it is detected that all of them are not turned off.

According to this configuration, in a switch having a plurality of contacts with different characteristics such as a normally open contact and a normally closed contact, by comparing the input state of the signal input from each contact of the switch to each microcomputer, , the occurrence of an abnormality can be determined. Further, it is possible to determine the type of abnormality based on the combination of signals input from each contact to each microcomputer.

Further, the first microcomputer maintains a state in which all signals input from the contacts of the switch are off for a second predetermined time or longer before the second microcomputer determines that the abnormality has occurred. If it continues, it may be determined that an abnormality has occurred in the input circuit of the first microcomputer, and the second predetermined time may be longer than the predetermined time used in the processing of the second microcomputer.

According to this configuration, the first microcomputer can determine that an abnormality has occurred in the input circuit of the first microcomputer.

Further, the second microcomputer may execute the monitoring control using the signal input from the switch to the first microcomputer after determining that the input circuit of the second microcomputer is abnormal.

According to this configuration, after determining that an abnormality has occurred in the input circuit of the second microcomputer, the second microcomputer can continue monitoring control using the signal input from the switch to the first microcomputer.

The first microcomputer may execute the change control using a signal input from the switch to the second microcomputer after determining that the input circuit of the first microcomputer is abnormal.

According to this configuration, after determining that the input circuit of the first microcomputer has an abnormality, the first microcomputer can continue the change control using the signal input from the switch to the second microcomputer.

The switch includes an operating member that is displaced between a first position and a second position, and an ON switch that connects the signal line by displacing the operating member between the first position and the second position. three contacts whose states are switched between a state and an off state for disconnecting the signal line, the three contacts being the normally open contacts, and the operation member being in the first position. is composed of a first contact that switches from the off state to the on state in the middle of displacement from the operating member to the second position, and the normally open contact, and the operating member moves from the first position to the second position is composed of a second contact that switches from the off state to the on state at a timing later than that of the first contact during the displacement of the operating member, and the normally closed contact, and the operating member moves from the first position to the first contact. In the middle of the displacement to position 2, the ON state occurs later than the switching of the first contact from the OFF state to the ON state and earlier than the switching of the second contact from the OFF state to the ON state. a first signal output from the first contact and the second contact as signals from the switch to the first microcomputer and the second microcomputer. A second signal output from the switch and a third signal output from the third contact are input, and the first microcomputer and the second microcomputer receive the first signal and the second signal in the switch. If all of the third signals are off, it may be determined that all of the signals input from the switch are off.

According to this configuration, the first microcomputer and the second microcomputer can monitor the occurrence of an abnormality in the switch having the first contact, the second contact, and the third contact having different characteristics.

In the present invention, when monitoring the change control of the shift range based on the input state of the signal input to each microcomputer from the switch, it is determined that there is an abnormality until a predetermined time has passed since the input state of the signal changed. do not Also, if it can be determined that the system is normal before the predetermined time elapses, it can be determined that the system is normal. As a result, it is possible to suppress the occurrence of erroneous determination of abnormality.

FIG. 1 is a skeleton diagram that schematically shows the vehicle of the first embodiment. FIG. 2 is a functional block diagram for explaining the electronic control device of the first embodiment. FIG. 3 is a flow chart showing the control shift range monitoring process. FIG. 4 is a flow chart showing control shift range monitoring processing in a modification of the first embodiment. FIG. 5 is a diagram showing a schematic configuration of a shift switch in the second embodiment. FIG. 6 is a functional block diagram for explaining the electronic control device of the second embodiment. FIG. 7 is a diagram for explaining a case where the NC contact of the shift switch is broken. FIG. 8 is a diagram for explaining a case where the NC contact of the shift switch is short-circuited. FIG. 9 is a flow chart showing shift operation monitoring processing in the second embodiment. FIG. 10 is a flow chart showing the control shift range determination process in the second embodiment. FIG. 11 is a flow chart showing shift operation monitoring processing in a modification of the second embodiment. FIG. 12 is a flow chart showing a control shift range determination process in a modification of the second embodiment. FIG. 13 is a diagram showing a schematic configuration of a shift switch in a modified example of the second embodiment. 14A and 14B are diagrams showing the operation of the shift switch shown in FIG. 13. FIG. 15 is a diagram showing the operation of the shift switch shown in FIG. 13. FIG. 16 is a diagram showing the operation of the shift switch shown in FIG. 13. FIG. FIG. 17 is a diagram showing a schematic configuration of a shift switch in another modified example of the second embodiment. 18 is a diagram showing the operation of the shift switch shown in FIG. 17. FIG. 19 is a diagram showing the operation of the shift switch shown in FIG. 17. FIG. 20 is a diagram showing the operation of the shift switch shown in FIG. 17. FIG.

An abnormality determination device according to an embodiment of the present invention will be specifically described below with reference to the drawings. In addition, this invention is not limited to embodiment described below.

(First embodiment)
FIG. 1 is a skeleton diagram that schematically shows the vehicle of the first embodiment. A vehicle 1 includes an engine 2 as a power source for running, a transmission 3 , a differential gear 4 , an axle 5 , and drive wheels 6 . This vehicle 1 is a FF (front engine/front drive) vehicle. The power output from the engine 2 is transmitted to the left and right drive wheels 6 through the transmission 3, the differential gear 4, and the left and right axles 5 in sequence. The transmission 3 is, for example, a multi-stage transmission including a plurality of planetary gear units and engagement devices.

The vehicle 1 includes a shift-by-wire system 20 that electrically switches the shift range of the transmission 3 according to the shift range selected by the shift switch 10 arranged near the driver's seat. The shift-by-wire system 20 includes a shift operating device 30 having a shift switch 10 , an electronic control unit (ECU) 40 and a parking lock device 50 .

The shift operation device 30 is arranged, for example, on an interior panel near the driver's seat, and includes a shift switch 10 for changing the shift range of the transmission 3 . The shift switch 10 is operated when the driver selects a shift range, and is composed of, for example, a momentary push button switch. This shift switch 10 is an ON/OFF switch for designating a shift range, and has a plurality of contacts for determining ON and OFF with one switch.

Further, the shift operation device 30 is provided with a plurality of shift switches 10 for selecting each shift range. This shift operation device 30 includes, as shift switches 10, a P switch 11 for selecting a parking range, an R switch 12 for selecting a reverse running range, and a neutral range for cutting off power transmission. An N switch 13, a D switch 14 for selecting the forward travel range, and a B switch 15 for selecting the deceleration forward travel range are provided.

The P switch 11 is a switch for switching the shift range of the transmission 3 to the parking range (P range), and is operated when the driver selects the P range. The P range is a shift range in which the power transmission path in transmission 3 is blocked and parking lock is performed by parking lock device 50 . The parking lock device 50 is a mechanism that mechanically prevents the drive wheels 6 from rotating when the vehicle is parked. For example, when the parking lock is not executed by the parking lock device 50 (non-parking lock state), when the driver presses the P switch 11 when a predetermined condition is satisfied, a signal is output from the P switch 11. The electronic control unit 40 that receives the output signal switches the shift range of the transmission 3 to the P range. The non-parking lock state is a state in which the drive wheels 6 are allowed to rotate.

The R switch 12 is a switch for switching the shift range of the transmission 3 to a reverse running range (R range), and is operated when the driver selects the R range. The R range is a shift range in which the driving force for moving the vehicle 1 backward is transmitted to the drive wheels 6 .

The N switch 13 is a switch for switching the shift range of the transmission 3 to a neutral range (N range), and is operated when the driver selects the N range. The N range is a shift range in which the power transmission path within the transmission 3 is cut off and is in a neutral state. In this N range, the power transmission path from the engine 2 to the drive wheels 6 is blocked, but the rotation of the drive wheels 6 is permitted.

The D switch 14 is a switch for switching the shift range of the transmission 3 to a forward running range (D range), and is operated when the driver selects the D range. The D range is a shift range in which driving force for driving the vehicle 1 forward is transmitted to the drive wheels 6 .

The B switch 15 is a switch for switching the shift range of the transmission 3 to a deceleration forward driving range (B range), and is operated when the driver selects the B range. The B range is a shift range in which the vehicle 1 exerts an engine braking effect to decelerate the rotation of the driving wheels 6 in the D range. That is, the B range can be selected by pressing the B switch 15 while the D range is selected.

The shift switch 10 outputs a shift signal to the electronic control unit 40 each time it is pressed by the driver. The shift signal is an electrical signal indicating that the shift switch 10 has been turned ON or OFF. Electronic control unit 40 electrically detects that shift switch 10 has been operated in response to a shift signal from shift switch 10 .

The electronic control unit 40 includes a microcomputer having a CPU, RAM, ROM, and an input/output interface. The electronic control unit 40 performs signal processing according to a program pre-stored in the ROM. For example, the electronic control unit 40 executes output control of the engine 2, shift control of the transmission 3, change control of the shift range in the shift-by-wire system 20, and the like. A command signal for controlling the engine 2 and a command signal for controlling the transmission 3 are output from the electronic control unit 40 .

Explaining the change control of the shift range, when any shift range is selected by the shift switch 10, the electronic control unit 40 controls the transmission 3, the parking lock device 50 and the display device corresponding to the selected shift range. 60 and the like. For example, the electronic control unit 40 performs control to switch from a non-forward travel range (non-D range) other than the forward travel range to a forward travel range (D range). In this case, a command signal is output from the electronic control device 40 to the display device 60 . As a result, the D range is displayed on the display device 60 that displays the currently selected shift range.

Control for changing the shift range also includes control for switching the state of the parking lock device 50 . For example, when the signal from the P switch 11 is input to the electronic control unit 40 while the parking lock device 50 is in the non-parking lock state, the electronic control unit 40 executes the parking lock by the parking lock device 50 . When any one of the R switch 12, N switch 13, and D switch 14 is pressed when the parking lock device 50 is in the parking lock state, the brake pedal is depressed. The electronic control unit 40 releases the parking lock on condition that a predetermined condition is satisfied.

The electronic control unit 40 also includes a control microcomputer 41 and a monitoring microcomputer 42 . A signal from the shift switch 10 is input to a control microcomputer 41 and a monitoring microcomputer 42, as shown in FIG. A signal input from the shift switch 10 to the control microcomputer 41 is a control shift signal. A signal input from the shift switch 10 to the monitoring microcomputer 42 is a monitoring shift signal. In this electronic control unit 40, the control microcomputer 41 is the first microcomputer, and the monitoring microcomputer 42 is the second microcomputer.

The control microcomputer 41 switches the shift range to the shift range corresponding to the shift switch 10 based on the signal output from the shift switch 10 when one of the shift switches 10 is pressed by the driver. It is the main microcomputer that executes change control. The control microcomputer 41 has a determination section 41a.

The determination unit 41 a determines the control shift range based on the shift signal input from the shift switch 10 . The control microcomputer 41, which is the first microcomputer, switches the shift range of the transmission 3 based on the control shift range determined by the determining section 41a. Also, a signal is output from the control microcomputer 41 to the display device 60 . Therefore, the control shift range determined by the determination unit 41a is displayed on the display device 60 that displays the currently selected shift range.

The monitoring microcomputer 42 is a sub-microcomputer that monitors change control by the control microcomputer 41 . The monitoring microcomputer 42, which is the second microcomputer, executes monitoring control to determine whether or not an abnormality has occurred based on the signal input from the shift switch 10 and the signal input from the control microcomputer 41. . The monitoring microcomputer 42 has a monitoring section 42a.

The monitoring unit 42 a monitors shift range change control by the electronic control unit 40 . The monitoring unit 42a receives the signal output from the determining unit 41a and the shift signal output from the shift switch 10 that has been pressed. A signal input from the determining unit 41a to the monitoring unit 42a is a signal indicating the control shift range determined by the determining unit 41a. Therefore, the monitoring unit 42a is selected by operating the shift switch 10 based on a signal input from the shift switch 10 to the monitoring microcomputer 42 and a signal input from the control microcomputer 41 to the monitoring microcomputer 42. It can be determined whether or not the shift range matches the control shift range determined by the control microcomputer 41 .

In this way, the monitoring microcomputer 42 monitors the occurrence of an abnormality in the shift-by-wire system 20 by monitoring the shift signal from the shift switch 10 and the calculation result of the control microcomputer 41 . In this case, since the signal output from the determination unit 41a of the control microcomputer 41 is input to the monitoring unit 42a, the monitoring microcomputer 42 detects that the control microcomputer 41 has executed change control to switch the control shift range. can be detected. For example, when the signal from the D switch 14 is not input to the monitoring microcomputer 42, when the control microcomputer 41 performs control to switch the control shift range to the D range, the monitoring microcomputer 42 It is determined that an abnormality has occurred in shift range change control. In this way, the electronic control device 40 is a device that monitors malfunction of the shift-by-wire system 20 and is an abnormality determination device that determines abnormality of the shift-by-wire system 20 .

FIG. 3 is a flow chart showing the control shift range monitoring process. Note that FIG. 3 shows a case of monitoring the D range among a plurality of shift ranges. Further, the processing shown in FIG. 3 is repeatedly executed by the monitoring microcomputer 42 at a predetermined calculation cycle.

The monitoring microcomputer 42 determines whether or not the input state of the monitoring shift signal from the D switch 14 has changed (step S101). In step S101, it is determined whether or not the input state of the signal from the D switch 14 among the shift signals input from the shift operating device 30 to the monitoring microcomputer 42 has changed from OFF to ON.

In this step S101, it can be determined whether or not the input state of even one of the signals input from the plurality of contacts of the D switch 14 has changed. In short, the signal whose input state changes may be the signal output from any of the contacts having different characteristics. When the input state of even one of the signals input from the plurality of contacts of the D switch 14 changes, it is not the case that the shift signal changes due to an operation other than the D range, but rather the operation of selecting the D range. I know you are doing

When the input state of the monitoring shift signal from the D switch 14 changes (step S101: Yes), the monitoring microcomputer 42 sets the D range permission flag to ON and sets the D range counter to a predetermined value A (step S102). The D range permission flag is a flag that permits switching of the control shift range to the D range. The D-range counter represents the permitted time for permitting a change to the D-range. The predetermined value A is a value greater than zero. That is, by setting the predetermined value A to the D-range counter, the predetermined time is set as the permission time for permitting the change to the D-range.

When the input state of the signal from the D switch 14 for the monitoring shift signal has not changed (step S101: No), or after performing the process of step S102, the monitoring microcomputer 42 detects that the D range counter is less than zero. is also greater (step S103).

When the D range counter is greater than zero (step S103: Yes), the monitoring microcomputer 42 subtracts the D range counter (step S104). In step S104, for example, the value of the D range counter is decremented by one. If the D range counter before subtraction is "A", the D range counter after subtraction can be expressed as "A-1". In short, in step S104, the countdown from the predetermined time corresponding to the predetermined value A set in the D range counter is performed.

If the D range counter is not greater than zero (step S103: No), the monitoring microcomputer 42 sets the D range permission flag to OFF (step S105). In step S105, if the current D-range permission flag is ON, it is switched from ON to OFF, and if the current D-range permission flag is OFF, it is kept OFF.

After performing the process of step S104 or after performing the process of step S105, the monitoring microcomputer 42 determines whether or not the control shift range has changed from other than the D range to the D range (step S106). In step S106, based on a signal input from the control microcomputer 41 to the monitoring microcomputer 42, it is determined whether or not the control shift range has been switched to the D range.

When the control shift range has changed from other than the D range to the D range (step S106: Yes), the monitoring microcomputer 42 determines whether or not the D range permission flag is ON (step S107).

If the D-range permission flag is not ON (step S107: No), the monitoring microcomputer 42 performs an abnormality treatment for the control shift range (step S108). In step S108, the monitoring microcomputer 42 detects that the control shift range has been switched to the D range while the change to the D range is not permitted, and determines that the shift-by-wire system 20 has an abnormality. . The case where the process of step S108 is executed is the case where the shift range for control is switched to the D range when the input state of the shift signal for monitoring has not changed at all. In other words, this case occurs when all of the signal lines for inputting the shift signal for monitoring (multiple signal lines provided for each contact) are disconnected or short-circuited, and the input signal does not change (first abnormality ), if only the input of the shift signal for control is input with noise that erroneously determines that there is a pressing operation (second abnormality), even if there is no input of the shift signal due to a bug or malfunction of the control Regardless, it is one of the cases where it is determined that there is a pressing operation (third abnormality). Therefore, the electronic control unit 40 executes fail-safe control, such as cutting the driving force of the vehicle 1, as an abnormality measure for the control shift range. After the process of step S108 is executed, this control routine ends.

If the control shift range does not change from other than the D range to the D range (step S106: No), or if the D range permission flag is ON (step S107: Yes), this control routine ends. In this case, the monitoring microcomputer 42 determines that the processing for the D range of the control shift ranges is normal.

Since the monitoring microcomputer 42 repeats the processing at a predetermined calculation cycle, the processing shown in FIG. 3 is looped. Therefore, after it is determined that the input state of the signal from the D switch 14 has been switched to ON, a loop is entered in which a negative determination is made in step S101. Once this loop is entered, the D range counter is counted down to 0 each time the process of step S104 is performed. If the D-range counter is greater than zero, the D-range permission flag remains ON, so a loop is formed in which the determination in step S107 is affirmative. Then, when the D range counter reaches 0 in the loop several times, a negative determination is made in step S103, and the D range permission flag is switched from ON to OFF in step S105. That is, after the permission time (predetermined time corresponding to the predetermined value A) elapses after the input state of the signal from the D switch 14 changes, the D range permission flag is turned OFF, so that the shift range for control is set to D. If it changes to the range, it is determined to be abnormal, and the process of step S108 is performed.

As described above, according to the first embodiment, when the monitoring microcomputer 42 monitors a malfunction, the monitoring microcomputer 42 receives a predetermined shift signal from the time when the state of the monitoring shift signal input from the shift switch 10 to the monitoring microcomputer 42 changes. The change to that shift range is permitted until the permitted time of . When the control microcomputer 41 changes the control shift range to the shift range when the monitoring microcomputer 42 does not permit the change to the shift range, the monitoring microcomputer 42 determines that there is an abnormality. . As a result, since it is not determined that there is an abnormality until the predetermined permission time elapses after the input state of the shift signal changes, a difference occurs between the calculation timings of the control microcomputer 41 and the monitoring microcomputer 42. However, it is possible to suppress the occurrence of erroneous determination of abnormality.

Also, in the first embodiment, the configuration in which one shift switch 10 is provided corresponding to each shift range has been described, but the present invention is not limited to this. The shift switch 10 may be provided in at least one of the P range, R range, N range, D range, B range, and the like. For example, shift switch 10 may be composed of P switch 11 and D switch 14 . Furthermore, the processing shown in FIG. 3 can also be applied to control shift ranges other than the D range. For example, the electronic control unit 40 can execute the processing shown in FIG. 3 for the P range. In short, the processing shown in FIG. 3 can be applied to the shift range provided with the shift switch 10 .

In addition, as a modification of the first embodiment, the monitoring microcomputer 42 may be configured to make a provisional determination that there is an abnormality, and then determine that there is an abnormality after a predetermined grace period has passed since the provisional determination. can be done. The control of this variant is shown in FIG.

FIG. 4 is a flow chart showing control shift range monitoring processing in a modification of the first embodiment. The processing shown in FIG. 4 is for monitoring the D range among a plurality of shift ranges, and is repeatedly executed by the monitoring microcomputer 42 at a predetermined calculation cycle. Further, the processing of steps S201 to S205 shown in FIG. 4 is the same as the processing of steps S101 to S105 shown in FIG. 3, so the description thereof will be omitted.

After performing the process of step S204 or after performing the process of step S205, the monitoring microcomputer 42 determines whether or not the D range permission flag is ON (step S206).

If the D range permission flag is ON (step S206: Yes), the monitoring microcomputer 42 sets the D range abnormality counter to zero (step S207). After performing the process of step S207, this control routine ends.

If the D range permission flag is not ON (step S206: No), the monitoring microcomputer 42 determines whether the D range abnormality counter is greater than zero (step S208).

If the D range abnormality counter is not greater than zero (step S208: No), the monitoring microcomputer 42 determines whether or not the control shift range has changed from other than the D range to the D range (step S209).

When the control shift range has changed from other than the D range to the D range (step S209: Yes), the monitoring microcomputer 42 sets the D range abnormality counter to a predetermined value B (step S210). The D-range abnormality counter represents a grace period until it is determined that the processing of the D-range is abnormal. The predetermined value B is a value greater than zero. That is, by setting the predetermined value B to the D-range abnormality counter, a grace period (predetermined time corresponding to the predetermined value B) until determination of abnormality is established. In other words, when the monitoring microcomputer 42 detects that the control shift range has switched to the D range when the D range permission flag is OFF, it provisionally determines that there is an abnormality. Further, the monitoring microcomputer 42 sets a grace period during which this provisional determination remains. That is, after step S209 provisionally determines that there is an abnormality, step S210 sets a grace period until the D-range permission flag is changed to ON. After performing the process of step S210, this control routine ends.

If the control shift range does not change from other than the D range to the D range (step S209: No), the control routine proceeds to step S207.

When the D range abnormality counter is greater than zero (step S208: Yes), the monitoring microcomputer 42 subtracts the D range abnormality counter (step S211). In step S211, for example, the value of the D range abnormality counter is subtracted by one. Assuming that the D range abnormality counter before subtraction is "B", the D range abnormality counter after subtraction can be expressed as "B-1". In short, in step S211, a countdown from a predetermined time corresponding to the predetermined value B set in the D range abnormality counter is performed.

After performing the process of step S211, the monitoring microcomputer 42 determines whether or not the D range abnormality counter is greater than zero (step S212).

If the D range abnormality counter is greater than zero (step S212: Yes), this control routine ends. In this case, the loop is performed while maintaining the state temporarily determined to be abnormal.

If the D-range abnormality counter is not greater than zero (step S212: No), the monitoring microcomputer 42 performs abnormality treatment for the control shift range (step S213). A negative determination in step S212 means that the grace period has elapsed. In other words, the state in which the abnormality has been provisionally determined has shifted to the state in which the determination of the abnormality has been finalized. Therefore, the electronic control unit 40 executes fail-safe control, such as cutting the driving force of the vehicle 1, as an abnormality measure for the control shift range. After executing the process of step S213, this control routine ends.

Since the monitoring microcomputer 42 repeats the process at a predetermined calculation cycle, the process shown in FIG. 4 loops. Therefore, after the control shift range is switched to the D range while the input state of the signal from the D switch 14 remains unchanged, a loop is entered in which the determination in step S208 is affirmative. Once this loop is entered, the D-range abnormality counter is counted down to 0 each time the process of step S211 is performed. If the D-range abnormality counter is greater than zero, affirmative determination is made in step S212, so the state of provisional determination of abnormality is maintained. Then, when the D-range abnormality counter becomes 0 in the loop several times, the determination of abnormality is confirmed because the determination in step S212 is negative. In other words, after the delay time has elapsed since the control shift range was switched to the D range when the input state of the signal from the D switch 14 has not changed, the determination of the abnormality is confirmed, and the process of step S213 is terminated. be implemented.

According to this modification, if the control shift range is switched to the shift range corresponding to the shift switch 10 while the input state of the shift signal for monitoring does not change, it is provisionally determined as abnormal. It can be performed. Then, if the input state of the shift signal for monitoring changes in the corresponding shift switch 10 before the predetermined grace period elapses in the state of the provisional determination, the provisional determination that there is an abnormality can be canceled. can. As a result, even if there is a difference in calculation timing between the control microcomputer 41 and the monitoring microcomputer 42, erroneous determination of abnormality can be suppressed. In other words, due to the asynchronous operation cycle of each microcomputer and the time lag for exchanging shift control information between microcomputers, there is a risk that the control side will change the shift range before the monitoring side determines permission. Therefore, in consideration of this, it is possible to prevent this by judging an abnormality after waiting for a predetermined grace period.

(Second embodiment)
Next, a second embodiment will be described. In the second embodiment, a shift switch having a normally open contact and a normally closed contact is configured to monitor the occurrence of an abnormality using a signal output from each contact of the shift switch. In addition, in the description of the second embodiment, the description of the same configuration as that of the first embodiment is omitted, and the reference numerals thereof are used.

FIG. 5 is a diagram showing a schematic configuration of a shift switch in the second embodiment. The shift switch 100 of the second embodiment includes one movable terminal 110 functioning as an operating member, and three fixed terminals, namely a first fixed terminal 111, a second fixed terminal 112 and a third fixed terminal 113. there is This shift switch 100 is a sliding contact type switch. Signal lines 114, 115 and 116 are connected to the fixed terminals 111, 112 and 113, respectively. A ground wire 117 is connected to the movable terminal 110 . In this description, normally open may be described as NO, and normally closed as NC. Moreover, the shift switch 100 can be mounted on the vehicle 1 in place of the shift switch 10 of the first embodiment.

The first fixed terminal 111 is a terminal that forms a normally open contact with the movable terminal 110 and forms the first contact of the three contacts. This first fixed terminal 111 is a first NO terminal forming a first NO contact. The second fixed terminal 112 is a terminal that forms a normally open contact with the movable terminal 110 and forms the second of the three contacts. This second fixed terminal 112 is a second NO terminal forming a second NO contact. The third fixed terminal 113 is a terminal that forms a normally closed contact with the movable terminal 110 and forms the third contact of the three contacts. This third fixed terminal 113 is an NC terminal forming an NC contact.

The movable terminal 110 slides over the fixed terminals 111, 112, 113 in a range from a first position indicated by a solid line to a second position indicated by a dashed line in FIG. The black circles shown in FIG. 5 indicate the state in which the contacts are closed, and the white circles in FIG. 5 indicate the state in which the contacts are open. At the first position, the movable terminal 110 is in contact only with the third fixed terminal 113 . That is, in the first position, the NC contact is closed and the first NO contact and the second NO contact are open. This state is the OFF state of the shift switch 100 .

Moreover, when the movable terminal 110 moves from the first position to the second position, the movable terminal 110 also contacts the first fixed terminal 111 . As a result, the NC contact and the first NO contact are closed and only the second NO contact is open.

Further, when the movable terminal 110 moves further toward the second position, the movable terminal 110 comes out of contact with the third fixed terminal 113 and contacts only the first fixed terminal 111 . As a result, the NC contact and the second NO contact are opened and only the first NO contact is closed.

When the movable terminal 110 moves further toward the second position, the movable terminal 110 reaches the second position. At the second position, the movable terminal 110 contacts the first fixed terminal 111 and the second fixed terminal 112 . That is, in the second position, the first NO contact and the second NO contact are closed and the NC contact is open. This state is the ON state of the shift switch 100 .

In this way, the three fixed terminals 111, 112, and 113 are arranged so that one or two of them come into contact with the movable terminal 110 when the movable terminal 110 slides from the first position to the second position. arrayed. In other words, until the shift switch 100 is switched from the OFF state to the ON state, none of the fixed terminals 111, 112, 113 are in contact with the movable terminal 110, and none of the fixed terminals 111, 112, 113, 113 The three fixed terminals 111 , 112 , 113 are arranged so that neither the 113 nor the movable terminal 110 is in contact with each other.

Signal lines 114 , 115 , 116 extending from each contact are connected to the electronic control unit 40 . As shown in FIG. 6, the signal lines 114, 115, 116 are connected to the control microcomputer 41 and the monitoring microcomputer 42, respectively. Signal line 114 transmits a first signal, which is a signal from the first NO contact. Signal line 115 transmits a second signal, which is a signal from the second NO contact. A signal line 116 transmits a third signal, which is a signal from the NC contact. An OFF signal is output from the open contact. An ON signal is output from the closed contact.

Electronic control unit 40 determines the operation performed on shift switch 100 based on the combination of signals input from signal lines 114 , 115 , and 116 . For example, when the combination of signals on signal lines 114, 115, and 116 is ON/ON/OFF, electronic control unit 40 determines that shift switch 100 has been turned on. When the combination of signals on signal lines 114, 115, and 116 is OFF/OFF/ON, electronic control unit 40 determines that shift switch 100 has been turned off. One shift switch 100 is provided for each range such as P, R, N, D, and B. Switching to each range is assigned to the ON operation of shift switch 100 . In the second embodiment, at least the D switch 14 is provided as the shift switch 100 . Therefore, the shift switch 100 may be referred to as the D switch 14 when describing the D range.

Further, electronic control unit 40 determines whether or not an abnormality has occurred based on the combination of signals input from signal lines 114 , 115 , and 116 . The control microcomputer 41 has an abnormality determination section 41b that determines whether there is an abnormality using signals from the signal lines 114, 115, and 116. FIG. Based on the signal input from each contact of the shift switch 100 and the information indicating the determination result input from the monitoring microcomputer 42, the abnormality determination unit 41b determines whether an abnormality has occurred on the control microcomputer 41 side. determine whether The monitoring microcomputer 42 also has an abnormality determination section 42b that determines whether there is an abnormality using signals from the signal lines 114, 115, and 116. FIG. Based on the signals input to the monitoring microcomputer 42 from each contact of the shift switch 100 and the signals input to the control microcomputer 41 from each contact of the shift switch 100, the abnormality determination unit 42b determines the monitoring microcomputer 42 side. determines whether or not an abnormality has occurred. The result of determination by the abnormality determination section 42b is input to the abnormality determination section 41b on the control side.

According to the shift switch 100, when there is no abnormality in any of the three contacts and the movable terminal 110 is in the first position, the first NO contact and the second NO contact are open, and the NC contact is closed. Further, when there is no abnormality in any of the three contacts and the movable terminal 110 is in the second position, the first NO contact and the second NO contact are closed, and the NC contact is open. . When none of the three contacts has an abnormality, none of the contacts are opened during the process of displacing the movable terminal 110 from the first position to the second position. It cannot be closed.

That is, according to the shift switch 100, the first NO contact, the second NO contact, and the NC contact are all opened only when the shift switch 100 has an abnormality. Similarly, all of these contacts are closed only when shift switch 100 malfunctions. If a switch is configured to go through a state in which all contacts are in the same state in the process of ON or OFF operation, the state of all contacts being in the same state can cause contact failure such as sticking OFF or sticking ON. It is not immediately possible to determine whether or not this is due to an abnormality. On the other hand, according to the shift switch 100, all of the contacts will not be in the same state if they are normal.

Here, types of abnormalities that occur in shift switch 100 will be described.

First, disconnection of the NC contact will be described with reference to FIG. As shown in FIG. 7, it is assumed that all the contacts are open when the movable terminal 110 is at the position indicated by the dashed line. In this case, the combination of signals input from the signal lines 114, 115, and 116 to the electronic control unit 40 is OFF-OFF-OFF, but such a signal combination does not exist in the shift switch 100 in a normal state. . Therefore, it is determined that the contact is fixed off, that is, disconnection occurs at some point of contact.

When the movable terminal 110 moves to the position indicated by the solid line in FIG. 7, the first fixed terminal 111 and the second fixed terminal 112 are closed if both are normal. Therefore, the signals input from the signal lines 114 and 115 to the electronic control unit 40 are switched from OFF to ON. On the other hand, the signal input to the electronic control unit 40 from the signal line 116 corresponding to the third fixed terminal 113 is kept OFF. When it becomes clear from changes in the signals on the signal lines 114 and 115 that both the first NO contact and the second NO contact are normal, it is determined that the abnormal contact is the NC contact and that the abnormality is disconnection. It turns out. In other words, it is determined that disconnection has occurred in the NC contact.

Next, short-circuiting of the NC contact will be described with reference to FIG. As shown in FIG. 8, it is assumed that all the contacts are closed when the movable terminal 110 is at the position indicated by the dashed line. In this case, the combination of the signals input to the electronic control unit 40 from the signal lines 114, 115 and 116 is ON-ON-ON. However, such a combination of signals does not exist in shift switch 100 in a normal state. Therefore, it is determined that some contact is stuck on, that is, a short circuit has occurred.

When the movable terminal 110 moves to the position indicated by the solid line in FIG. 8, the first fixed terminal 111 and the second fixed terminal 112 are opened if both are normal. Therefore, the signals input to the electronic control unit 40 from the signal lines 114 and 115 are switched from ON to OFF. On the other hand, the signal input to the electronic control unit 40 from the signal line 116 corresponding to the third fixed terminal 113 is kept ON. When it becomes clear from changes in the signals on the signal lines 114 and 115 that both the first NO contact and the second NO contact are normal, it is determined that the abnormal contact is the NC contact and that the abnormality is a short circuit. It turns out. That is, it is determined that the NC contact is short-circuited.

These abnormality determination methods are possible because the shift switch 100 does not contact the movable terminal 110 with any of the fixed terminals 111, 112, and 113, and the movable terminal 110 does not contact any of the fixed terminals 111, 112, This is because there is no non-contact state with 113 . If the movable terminal were configured so as not to contact any fixed terminal during the sliding process, it would be assumed that disconnection would occur immediately based on the fact that all the signals are OFF. cannot be determined. In this case, in order to determine whether disconnection has actually occurred, for example, it is conceivable to determine whether or not all the signals have been in the OFF state for a predetermined period of time. However, in this case, when the driver continues to move the movable terminal by a small amount, it may be erroneously determined that the shift switch is disconnected even though there is no actual abnormality. . Alternatively, in the case where the movable terminal is configured to come into contact with all the fixed terminals in the process of sliding, it is immediately determined that a short circuit has occurred based on all the signals being ON. Not sure. In this case as well, when the driver continues to move the movable terminal by a small amount, it may be erroneously determined that the shift switch is short-circuited, even though there is actually no abnormality.

FIG. 9 is a flow chart showing shift operation monitoring processing in the second embodiment. The processing shown in FIG. 9 is for monitoring the shift operation in the D range among the plurality of shift ranges, and is repeatedly executed by the monitoring microcomputer 42 at a predetermined calculation cycle.

The monitoring microcomputer 42 receives a control shift signal from the control microcomputer 41 (step S301). In the electronic control unit 40 , a control shift signal input from the shift switch 10 to the control microcomputer 41 is output from the control microcomputer 41 to the monitoring microcomputer 42 . In step S301, a signal input from the shift switch 10 to the control microcomputer 41 is input to the monitoring microcomputer . That is, a control shift signal used for control by the control microcomputer 41 is input to the monitoring microcomputer 42 .

The monitoring microcomputer 42 detects that the signal from the D switch 14 has been input with respect to the monitoring shift signal (step S302). In step S302, the signal output from each contact of the shift switch 10 is input to the monitoring microcomputer .

The monitoring microcomputer 42 determines whether or not all of the monitoring shift signals input from the contacts of the D switch 14 are OFF (step S303). In step S303, it is determined whether or not the combination of signals input to the monitoring microcomputer 42 from the signal lines 114, 115 and 116 is OFF-OFF-OFF.

Regarding the shift signal for monitoring, if all the signals input from the contacts of the D switch 14 are not OFF (step S303: No), the monitoring microcomputer 42 clears the duration (step S304). The continuation time represents the time during which all the signals input from the contacts of the D switch 14 to the monitoring microcomputer 42 remain OFF.

After executing the process of step S304, the monitoring microcomputer 42 determines that there is no abnormality on the monitoring side (step S305). In step S305, a determination result indicating that there is no abnormality on the monitoring side is output to the control microcomputer 41. FIG.

After performing the processing of step S305, the monitoring microcomputer 42 performs monitoring control of the D range (step S306). In step S306, monitoring control of processing relating to the D range of the control shift ranges is performed. In other words, normal monitoring control is performed. After performing the process of step S306, this control routine ends.

Regarding the monitoring shift signal, if all the signals input from the contacts of the D switch 14 are OFF (step S303: Yes), the monitoring microcomputer 42 counts up the duration (step S307). In step S307, the duration of the state in which all the signals input to the monitoring microcomputer 42 from each contact of the D switch 14 are OFF is added.

After performing the process of step S307, the monitoring microcomputer 42 determines whether or not a predetermined time C has passed (step S308). In step S308, it is determined whether or not the duration time counted up in step S307 exceeds a predetermined time period C or not. The predetermined time C is a preset value. When the duration exceeds the predetermined time C, it is determined that the predetermined time C has passed.

If it is not determined that the predetermined time C has passed (step S308: No), the control routine proceeds to step S305.

When it is determined that the predetermined time C has passed (step S308: Yes), the monitoring microcomputer 42 checks whether or not all the signals input from the respective contacts of the D switch 14 regarding the shift signal for control are OFF. Determine (step S309). In step S309, it is determined using the shift signal for control acquired in step S301 whether or not all the signals input to the control microcomputer 41 from each contact of the D switch 14 are OFF. That is, in step S309, the monitoring microcomputer 42 determines whether or not the signal input from the shift switch 100 to the control microcomputer 41 matches the signal input from the shift switch 100 to the monitoring microcomputer 42. do.

Regarding the shift signal for control, if all the signals input from the contacts of the D switch 14 are OFF (step S309: Yes), the monitoring microcomputer 42 determines that there is an abnormality in the wire harness or the shift switch 100 in the shift-by-wire system 20. Determine (step S310). In step S310, it is determined that the wire harness (W/H) provided between the shift switch 100 and the monitoring microcomputer 42 or the module of the shift switch 100 is abnormal. This abnormality includes wire harness disconnection or short circuit, or shift switch 100 disconnection or short circuit. That is, it is determined that an abnormality has occurred in the signal lines 114, 115, 116 connected to the D switch 14 or the shift switch 100 itself. Further, in step S310, a determination result indicating abnormality of the wire harness or the shift switch 100 is output to the control microcomputer 41. FIG. After performing the process of step S310, this control routine ends.

Regarding the shift signal for control, if all the signals input from the contacts of the D switch 14 are not OFF (step S309: No), the monitoring microcomputer 42 determines that there is an abnormality in the input circuit on the monitoring side (step S311). . At step S311, it is determined that an abnormality has occurred in the input circuit of the monitoring microcomputer . Further, in step S311, a determination result indicating an abnormality in the input circuit of the monitoring microcomputer 42 is output to the control microcomputer 41. FIG. After performing the process of step S311, this control routine ends.

Since the monitoring microcomputer 42 repeats the process at a predetermined calculation cycle, the process shown in FIG. 9 is looped. Therefore, after it is determined that all of the signals input from the respective contacts of the D switch 14 regarding the shift signal for monitoring are OFF, a loop for executing the processing of step S307 is entered. Once this loop is entered, the duration is counted up each time the process of step S307 is performed. If the duration is shorter than the predetermined time C, a negative determination is made in step S308, so it is determined that there is no abnormality on the monitoring side. Then, when the duration exceeds the predetermined time C in the loop several times, the affirmative determination is made in step S308, so that it is determined to be abnormal.

In addition, in the process flow shown in FIG. 9, the monitoring microcomputer 42 outputs to the control microcomputer 41 the determination result regarding the presence or absence of an abnormality, so the control microcomputer 41 can monitor the control of the monitoring microcomputer 42. .

FIG. 10 is a flow chart showing the control shift range determination process in the second embodiment. The processing shown in FIG. 10 is for determining the D range as the control shift range, and is repeatedly executed by the control microcomputer 41 at a predetermined calculation cycle.

The control microcomputer 41 detects that a control shift signal is input from the D switch 14 (step S401). In step S401, the signal output from each contact of the shift switch 10 is input to the control microcomputer 41. FIG.

The control microcomputer 41 receives the determination result on the monitoring side from the monitoring microcomputer 42 (step S402). In step S402, as the determination result on the monitoring side, information indicating that the processing of step S305 shown in FIG. It is input to the control microcomputer 41 .

The control microcomputer 41 determines whether all of the control shift signals input from the contacts of the D switch 14 are OFF (step S403). In step S403, it is determined whether or not the combination of signals input to the control microcomputer 41 from the signal lines 114, 115 and 116 connected to the D switch 14 is OFF-OFF-OFF.

Regarding the shift signal for control, if all the signals input from the contacts of the D switch 14 are not OFF (step S403: No), the control microcomputer 41 clears the duration (step S404). The continuation time represents the time during which all the signals input to the control microcomputer 41 from the contacts of the D switch 14 remain OFF.

After executing the process of step S403, the control microcomputer 41 determines that there is no abnormality on the control side (step S405).

After performing the processing of step S405, the control microcomputer 41 performs determination control for switching the control shift range to the D range (step S406). In step S406, control for changing the shift range in normal operation is performed. That is, in step S406, the electronic control unit 40 determines whether or not the D range is selected based on the shift signal input from the D switch 14 to the control microcomputer 41, and sets the control shift range to the D range. Make a decision to switch. After performing the process of step S406, this control routine ends.

Regarding the shift signal for control, if all the signals input from the contacts of the D switch 14 are OFF (step S403: Yes), the control microcomputer 41 counts up the duration (step S407). In step S407, the duration of the state in which all the signals input to the control microcomputer 41 from the respective contacts of the D switch 14 are OFF is added.

After performing the process of step S407, the control microcomputer 41 determines whether or not a predetermined time D has passed (step S408). In step S408, it is determined whether or not the duration added in step S407 exceeds a predetermined time D. When the duration exceeds the predetermined time D, it is determined that the predetermined time D has passed. Also, the predetermined time D is a second predetermined time longer than the predetermined time C. As shown in FIG.

If it is not determined that the predetermined time D has passed (step S408: No), the control routine proceeds to step S405.

If it is determined that the predetermined time D has passed (step S408: Yes), the control microcomputer 41 determines whether the result of determination on the monitoring side indicates an abnormality in the wire harness or the shift switch 100 ( step S409). In step S409, it is determined whether or not the result of the determination on the monitoring side obtained in step S402 indicates that the wire harness or shift switch 100 is abnormal. That is, it is determined whether or not step S310 shown in FIG. 9 has been performed.

If the monitoring determination result indicates an abnormality in the wire harness or the shift switch 100 (step S409: Yes), the control microcomputer 41 determines that the wire harness or the shift switch 100 in the shift-by-wire system 20 is abnormal ( step S410). The process of step S410 is the same as the process of step S310 on the monitoring side. After performing the process of step S410, this control routine ends.

If the monitoring determination result does not indicate an abnormality in the wire harness or the shift switch 100 (step S409: No), the control microcomputer 41 determines that an input circuit on the control side is abnormal (step S411). In step S411, it is determined that the input circuit of the control microcomputer 41 is abnormal. After executing the process of step S411, this control routine ends.

Since the control microcomputer 41 repeats the process at a predetermined calculation cycle, the process shown in FIG. 10 loops. Therefore, after it is determined that all the signals input from the respective contacts of the D switch 14 regarding the shift signals for control are OFF, a loop for executing the processing of step S407 is entered. Once this loop is entered, the duration is counted up each time the process of step S407 is performed. If the duration is shorter than the predetermined time D, a negative determination is made in step S408, so it is determined that there is no abnormality on the control side. Then, when the duration exceeds the predetermined time D in the loop several times, the determination in step S408 is affirmative, so that it is determined to be abnormal.

As described above, according to the second embodiment, whether or not an abnormality has occurred is determined by comparing the signals input from each contact of the shift switch 10 to the control microcomputer 41 and the monitoring microcomputer 42 . judge. The control microcomputer 41 and the monitoring microcomputer 42 use the information obtained from the other microcomputer to determine that there is an abnormality after the state in which all the signals input from the contacts of the shift switch 10 are OFF for a predetermined period of time. can do. As a result, even if there is a difference in calculation timing between the control microcomputer 41 and the monitoring microcomputer 42, erroneous determination of abnormality can be suppressed.

Further, as a modification of the second embodiment, when the monitoring microcomputer 42 determines that an abnormality has occurred in its own input circuit, monitoring control is performed using a control shift signal in the control microcomputer 41. can be configured as Furthermore, when the control microcomputer 41 determines that an abnormality has occurred in its own input circuit, it can be configured to perform shift range change control using a monitoring shift signal in the monitoring microcomputer 42 . can. The control of this modification is shown in FIGS. 11 and 12. FIG.

FIG. 11 is a flow chart showing shift operation monitoring processing in a modification of the second embodiment. Note that the processing shown in FIG. 11 is a modification of the processing shown in FIG. Since the processing of steps S501 to S511 shown in FIG. 11 is the same as the processing of steps S301 to S311 shown in FIG. 9, description thereof is omitted.

After executing the process of step S511, the monitoring microcomputer 42 shifts to a control state in which the shift signal for control is substituted for the shift signal for monitoring (step S512). In step S512, instead of the shift signal for monitoring, the control state is switched to use the shift signal for control acquired in step S501.

After performing the process of step S512, the control routine proceeds to step S506. In this case, the monitoring microcomputer 42 continues monitoring and controlling the shift operation of the D range using the shift signal for control.

FIG. 12 is a flow chart showing a control shift range determination process in a modification of the second embodiment. Note that the process shown in FIG. 12 is a modification of the process shown in FIG. The processing of steps S601 and S603 to S612 shown in FIG. 12 is the same as the processing of steps S401 to S411 shown in FIG. 10, so description thereof will be omitted.

After executing the process of step S601, the control microcomputer 41 receives a monitoring shift signal from the monitoring microcomputer 42 (step S602). In the electronic control unit 40 , a monitoring shift signal input from the shift switch 10 to the monitoring microcomputer 42 is output from the monitoring microcomputer 42 to the control microcomputer 41 . A monitoring shift signal used for monitoring control by the monitoring microcomputer 42 is input to the control microcomputer 41 . After executing the process of step S602, the control routine proceeds to step S603.

After executing the process of step S612, the control microcomputer 41 shifts to a control state in which the shift signal for monitoring is substituted for the shift signal for control (step S613). In step S613, instead of the shift signal for control, the control state is switched to use the shift signal for monitoring acquired in step S602.

After performing the process of step S613, the control routine proceeds to step S607. In this case, the control microcomputer 41 performs control to determine switching to the D range using the shift signal for monitoring.

Moreover, it is possible to configure a modified example of the shift switch 100 . Modifications of the shift switch are illustrated in FIGS. 13 to 20. FIG.

As shown in FIG. 13, the shift switch 200 in the modified example is an opposed contact type switch. The first NO terminal 211 and the second NO terminal 212 are arranged to face a ground terminal 216 whose position is fixed. The NC terminal 213 is installed to face a ground terminal 217 whose position is fixed. However, the direction in which NC terminal 213 faces ground terminal 217 is opposite to the direction in which first NO terminal 211 and second NO terminal 212 face ground terminal 216 .

The first NO terminal 211 and the second NO terminal 212 are arranged between the operating member 210 and the ground terminal 216 . The first NO terminal 211 is connected to the operating member 210 by a spring 214 having a small spring constant, and is connected to a ground terminal 216 by a spring 215 having a large spring constant. Conversely, the second NO terminal 212 is connected to the operating member 210 by the spring 215 and is connected to the ground terminal 216 by the spring 214 . The NC terminal 213 is arranged between the operating member 210 and a fixed member 218 whose position is fixed. The NC terminal 213 is connected to the operating member 210 and the spring 214 and is connected to the fixing member 218 and the spring 215 .

When no force is applied to the operating member 210 , the first NO terminal 211 and the second NO terminal 212 are separated from the ground terminal 216 and the NC terminal 213 is in contact with the ground terminal 217 . The first NO terminal 211 and the ground terminal 216 constitute a first NO contact as a first contact, and the second NO terminal 212 and the ground terminal 216 constitute a second NO contact as a second contact. Also, the NC terminal 213 constitutes an NC contact as a third contact together with the ground terminal 217 .

A signal line is connected to each of the first NO terminal 211 , the second NO terminal 212 and the NC terminal 213 . When no force is applied to the operating member 210, the operating member 210 is positioned at the first position as shown in FIG. In this state, the first NO contact and the second NO contact are open, and OFF signals are output from them. On the other hand, the NC contact is closed and an ON signal is output from it. This state is the OFF state of shift switch 200 .

In this shift switch 200, when the operating member 210 is pushed down, the spring 214 having a small spring constant contracts, and the first NO terminal 211 contacts the ground terminal 216, as shown in FIG. As a result, the signal output from the first NO contact becomes an ON signal. As the operation member 210 is further pushed down, the spring 215 having a large spring constant begins to contract, and the NC terminal 213 is separated from the ground terminal 217, as shown in FIG. As a result, the signal output from the NC contact becomes an OFF signal.

When the operating member 210 is further pushed down, the operating member 210 reaches the second position as shown in FIG. In the second position, second NO terminal 212 contacts ground terminal 216 . As a result, the signal output from the second NO contact becomes an ON signal. At this time, the first NO contact and the second NO contact are closed, and the NC contact is open. This state is the ON state of shift switch 200 .

Also, as shown in FIG. 17, a shift switch 300 in another modification is a hybrid switch having two sliding contacts and one opposing contact. This shift switch 300 has two NO terminals 311 and 312 whose positions are fixed, and one movable terminal 310 which is grounded. Each NO terminal 311 , 312 constitutes a sliding contact with the movable terminal 310 . The shift switch 300 also has an NC terminal 313 and a ground terminal 317 whose position is fixed. NC terminal 313 constitutes an opposing contact with earth terminal 317 . The NC terminal 313 is arranged between the movable terminal 310 as an operating member and the fixed member 316 . The NC terminal 313 is connected to the movable terminal 310 by a spring 314 having a small spring constant, and is connected to a fixed member 316 by a spring 315 having a large spring constant. Each NO terminal 311 , 312 constitutes a NO contact with the movable terminal 310 . The NC terminal 313 constitutes an NC contact with the earth terminal 317 .

When no force is applied to the movable terminal 310, the movable terminal 310 is positioned at the first position as shown in FIG. In this state, the first NO contact and the second NO contact are open, and OFF signals are output from them. A white circle shown in FIG. 17 indicates a state in which the contact is open. On the other hand, the NC contact is closed and an ON signal is output from it. This state is the OFF state of shift switch 300 .

In this shift switch 300, when the movable terminal 310 is slid in the direction of contracting the springs 314 and 315, the movable terminal 310 comes into contact with the first NO terminal 311 as shown in FIG. As a result, the NC contact and the first NO contact are closed and only the second NO contact is open. A black circle shown in FIG. 18 indicates a state in which the contact is open. At this time, the NC terminal 313 is still in contact with the ground terminal 317 although the spring 314 having a large spring constant begins to contract. As the movable terminal 310 is further slid, the spring 315 having a large spring constant begins to contract, and the NC terminal 313 separates from the ground terminal 317, as shown in FIG. As a result, the signal output from the NC contact becomes an OFF signal.

When the movable terminal 310 is further slid, the movable terminal 310 reaches the second position as shown in FIG. At the second position, movable terminal 310 contacts second NO terminal 312 . As a result, the signal output from the second NO contact becomes an ON signal. At this time, the first NO contact and the second NO contact are closed, and the NC contact is open. This state is the ON state of shift switch 300 .

All of the shift switches 100, 200, and 300 described in the second embodiment and each modification can be applied to the first embodiment. That is, the shift switch 10 of the first embodiment can be configured like the shift switch 200 of the second embodiment.

1 vehicle 3 transmission 10 shift switch (switch)
11 P switch 14 D switch 20 Shift-by-wire system 30 Shift operation device 40 Electronic control device (abnormality determination device)
41 control microcomputer (first microcomputer)
42 Monitoring microcomputer (second microcomputer)
100 shift switch 110 movable terminal 111 first fixed terminal (first NO terminal)
112 second fixed terminal (second NO terminal)
113 Third fixed terminal (NC terminal)

Claims (8)

a first microcomputer and a second microcomputer that respectively execute control according to the operation of the switch for changing the shift range of the vehicle when the switch is operated;
The first microcomputer performs change control to switch a shift range to a shift range corresponding to the switch based on a signal input from the switch when the switch is operated,
The second microcomputer is an abnormality determination device that executes monitoring control to determine whether an abnormality has occurred based on a signal input from the switch and a signal input from the first microcomputer,
The second microcomputer
setting a permission time for permitting a change to a shift range corresponding to the switch when the input state of the signal input from the switch changes;
When it is detected that the change control for switching the shift range to the shift range corresponding to the switch is executed by the first microcomputer during the period from when the input state changes until the permission time elapses, normal determined to be
When it is detected that the change control for switching the shift range to the shift range corresponding to the switch is executed by the first microcomputer after the allowable time has passed since the input state changed, it is determined as abnormal. An abnormality determination device characterized by: When the second microcomputer detects that the first microcomputer has executed change control to switch to the shift range corresponding to the switch when the input state of the signal input from the switch has not changed. , is provisionally determined to be abnormal. The second microcomputer
When it is provisionally determined that there is an abnormality, a predetermined grace period is set,
canceling the provisional determination when the input state of the signal input from the switch changes during the period from when the provisional determination of the abnormality is made until the grace period elapses;
3. The abnormality according to claim 2, wherein the abnormality is determined when the input state of the signal input from the switch does not change during the period from when the abnormality is provisionally determined until the grace period elapses. judgment device. a first microcomputer and a second microcomputer that respectively execute control according to the operation of the switch for changing the shift range of the vehicle when the switch is operated;
The first microcomputer performs change control to switch a shift range to a shift range corresponding to the switch based on a signal input from the switch when the switch is operated,
The second microcomputer is an abnormality determination device that executes monitoring control to determine whether an abnormality has occurred based on a signal input from the switch and a signal input from the first microcomputer,
The switch has a normally open contact and a normally closed contact, controls on and off of the switch according to a signal output from each contact,
The second microcomputer
When it is detected that all the signals input to the first microcomputer from the contacts of the switch are off when the state in which all the signals input from the contacts of the switch are off continues for a predetermined time or longer. , it is determined that an abnormality has occurred in the wire harness provided between the switch and each microcomputer or in the switch,
When it is detected that all the signals input from the switches to the first microcomputer are not off when the state in which all the signals input from the switches are off continues for a predetermined time or longer, the second microcomputer An anomaly judgment device characterized by judging that an abnormality has occurred in an input circuit. Before the first microcomputer determines that the abnormality has occurred, the state in which all the signals input from the contacts of the switch are off continues for a second predetermined time or longer. , it is determined that an abnormality has occurred in the input circuit of the first microcomputer,
5. The abnormality determination device according to claim 4, wherein said second predetermined time is longer than said predetermined time used in processing of said second microcomputer. 5. After determining that the input circuit of the second microcomputer is abnormal, the second microcomputer executes the monitoring control using the signal input from the switch to the first microcomputer. 6. The abnormality determination device according to 5. 6. After determining that the input circuit of the first microcomputer is abnormal, the first microcomputer executes the change control using a signal input from the switch to the second microcomputer. Abnormality determination device according to. The switch is
an operating member displaceable between a first position and a second position;
three contacts whose states are switched between an ON state for connecting a signal line and an OFF state for disconnecting the signal line by displacement of the operating member between the first position and the second position; with
The three contacts are
a first contact that is composed of the normally open contact and that switches from the off state to the on state while the operation member is being displaced from the first position to the second position;
A second contact, which is composed of the normally open type contact and switches from the off state to the on state at a timing later than that of the first contact while the operating member is being displaced from the first position to the second position. a point of contact;
During the displacement of the operating member from the first position to the second position, the first contact is switched from the OFF state to the ON state, and the first contact is switched to the ON state. a third contact that switches from the on state to the off state at an earlier timing than the two contacts switch from the off state to the on state;
In the first microcomputer and the second microcomputer, as signals from the switch, a first signal output from the first contact, a second signal output from the second contact, and a signal output from the third contact A third signal to be output and a are input,
The first microcomputer and the second microcomputer determine that all the signals input from the switch are off when the first signal, the second signal, and the third signal in the switch are all off. 8. The abnormality determination device according to any one of claims 4 to 7, characterized in that it determines.

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