JP3830837B2 - In-vehicle electronic control circuit with sensor self-diagnosis signal proper processing function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle electronic control circuit with a sensor self-diagnosis signal proper processing function that avoids erroneous processing in a microcomputer for various sensor inputs used in an in-vehicle electronic control circuit for controlling the brake fluid pressure of an automobile.
[0002]
[Prior art]
Electronic control circuits for controlling the brake hydraulic pressure circuit that sends hydraulic pressure to the wheel cylinders of automobile wheel brakes include wheel speed sensors, G sensors, lateral G sensors, yaw rate sensors, pressure sensors (P sensors), etc. Detection signals for performing the control are connected so as to be sent from the respective sensors. The brake fluid pressure circuit is equipped with multiple sets of solenoid valves, fluid pressure pumps, reservoirs, etc., which are required during driving by driving the solenoid valves and pump motors with control signals from the electronic control circuit to increase or decrease pressure. Control is performed.
[0003]
Such control is based on detection signals from the various sensors described above, and the control content required during travel is determined. ASC control (Active Stability Control), ABS control (Antilock Brake System), BA control (Brake Assist), etc. However, based on the contents of the determination, the operation states of the electromagnetic valves and the like necessary for each control are combined.
[0004]
When performing the various controls described above, detection signals from various sensors are sent to the microcomputer used as the main control unit of the electronic control circuit, and the microcomputer has no failure in the components in its circuit at the time of startup. A self-diagnostic function for diagnosing such a fault diagnoses a fault in its own circuit, and accepts signals of sensor self-diagnosis results of various sensors to diagnose whether a fault has occurred in the sensor.
[0005]
However, the various sensors are premised on sensors having a self-diagnosis function for self-diagnosing whether a signal measured by each sensor circuit has failed. Such a sensor with a self-diagnosis function includes, for example, a P sensor, a G sensor, a lateral G sensor, a yaw rate sensor, or a combine sensor in which a G sensor and a yaw rate sensor are integrated, and a small microcomputer attached thereto. A check at the start of the sensor and a constant check after the start are performed.
[0006]
Self-diagnosis includes sensor element operation check, sensor disconnection check, internal diagnostic circuit check, sensor power supply, GND, output disconnection check, and the like.
[0007]
[Problems to be solved by the invention]
By the way, in the circuit configured to input the sensor signal to the microcomputer of the electronic control circuit using the sensor having the above-described self-diagnosis function, the sensor self-diagnosis result signal is output after the microcomputer self-diagnosis operation at the start-up. It accepts and checks whether there is any abnormality in the sensor. However, as shown in FIG. 8, when it takes time for the self-diagnosis of the microcomputer, since the self-diagnosis is performed separately in parallel even with the sensor that is activated at the same time and a failure diagnosis signal is output, the microcomputer There may be a timing shift (delay) in which the failure diagnosis signal cannot be received at the timing when the permission to receive the failure diagnosis signal is given.
[0008]
On the other hand, a sensor having a self-diagnosis function outputs a signal measured by a sensor element as a sensor signal, and if the self-diagnosis result is abnormal as a self-diagnosis signal, L ₀ In some cases, the sensor may have two output lines for outputting a Hi signal. However, an abnormal signal (L ₀ Output) for a few seconds so that the self-diagnosis signal can be determined normally. If the circuit of the self-diagnosis signal is normal, even if an abnormal signal is forcibly sent, the output should be able to output the signal as instructed. If there is a normal side fixing failure that continues to output ₀ This is because a failure of the self-diagnosis signal circuit can be detected by not being in the output state.
[0009]
However, when a self-diagnostic sensor having such a useful function is used, the output of such a sensor is simply output without taking measures to effectively operate the function of such a sensor in the electronic control circuit. Simply connecting to a microcomputer causes the following inconveniences. In other words, if the line that supplies power to the microcomputer drops in voltage for some reason, a reset signal is input to the microcomputer, so the microcomputer is reset. Similarly, the computer waits for an abnormal signal for several seconds from the sensor assuming that the sensor is also reset.
[0010]
However, even if the microcomputer is reset, the sensor is not always reset and may not be reset. In such a case, the self-diagnosis signal from the sensor remains Hi. For this reason, the microcomputer determines that the Hi self-diagnostic signal is a normal-side fixing signal, determines that the self-diagnostic circuit has failed, and does not receive the sensor signal. Therefore, if the sensor is connected without taking any measures against the reset operation of the microcomputer, the microcomputer malfunctions.
[0011]
The present invention pays attention to the first problem and sends out a signal representing the self-diagnosis result of the self-diagnostic sensor at an appropriate timing at a timing receivable by a microcomputer for self-diagnosis. It is an object of the present invention to provide an in-vehicle electronic control circuit with a sensor self-diagnosis signal proper processing function that can prevent erroneous signal processing by simple means.
[0012]
In addition to the above-mentioned problems, when a sensor of a type including a normal-side fixing failure detection signal is used as a self-diagnosis signal, this detection signal causes the microcomputer to be reset when the microcomputer is reset or started in a normal-side fixing failure state. Another object is to provide an in-vehicle electronic control circuit that avoids erroneous processing of sensor input erroneous processing.
[0013]
[Means for Solving the Problems]
As a means for solving the first problem, the present invention provides a microcomputer having a self-diagnostic function, which is supplied with power from an in-vehicle power supply unit via a power supply circuit and outputs a control signal for controlling an actuator to be controlled. In the electronic control circuit equipped with, a sensor having a self-diagnosis function is connected to the microcomputer, a delay switch means is provided in a path for separately supplying power from the in-vehicle power supply unit to the sensor, and a command is issued from the microcomputer supplied with power In-vehicle electronic control with sensor self-diagnosis signal proper processing function, which sends power to sensor when signal is sent to delay switch means, and accepts self-diagnosis signal at sensor activation after self-diagnosis at microcomputer activation It was a circuit.
[0014]
In the vehicle-mounted electronic control circuit with the sensor self-diagnosis signal proper processing function of the first invention configured as described above, it is possible to avoid sensor input error processing by optimizing the input timing of the sensor input to the microcomputer. Arithmetic control is performed. It is assumed that the microcomputer and the sensor each have a function for self-diagnosis of the configuration and function in its circuit. The power supply to the microcomputer and the power supply to the sensor are supplied through separate power supply circuits, respectively, but the original power supply unit is common, and the power supply is branched from this power supply unit.
[0015]
However, the power supply to the sensor is sent through another power supply circuit by turning on the switch by sending a command signal output after the self-diagnosis process in the microcomputer to the delay switch means. Immediately after the sensor to which power is supplied is activated, self-diagnosis in the sensor is performed, and if the signal of the self-diagnosis result is normal, the microcomputer reads these signals together with the sensor signal and performs appropriate arithmetic processing. Control is performed. Therefore, there is no inconvenience that the signal from the sensor is not input because the microcomputer has not finished self-diagnosis processing and is not processed as a normal signal.
[0016]
The second invention is employed as a means for solving the second problem, and is based on the first invention, and includes a signal that outputs an abnormal output for a short time immediately after the sensor is started. Output a self-diagnosis signal as a sensor signal, or have a self-diagnosis signal separately from the sensor output, and output it for a short time immediately after startup. ₀ If the reset signal is input to the microcomputer after the microcomputer is started, the command signal to the delay switch means is turned OFF and the sensor is reset. This is a vehicle-mounted electronic control circuit with a sensor self-diagnosis signal proper processing function that is not mistaken for an original abnormality signal by accepting a self-diagnosis signal at the time of sensor activation after restarting and self-diagnosis of the microcomputer.
[0017]
In the present invention, as in the first invention, the sensor is activated after the microcomputer is activated, and the signal from the sensor is properly received and processed after the microcomputer self-diagnosis, as well as only in the microcomputer. Even when the reset signal is applied or when the self-diagnosis signal of the sensor is in the normal fixing side failure state, each signal is correctly received and appropriate processing is performed. In the sensor of the present invention, the self-diagnosis result signal is an abnormal signal only at startup. ₀ Thus, it has a function of confirming whether or not the circuit system can be determined to be abnormal when it is abnormal. This sensor is also used in the third invention.
[0018]
The third invention is employed as another means for solving the above second problem, and is supplied with power from the in-vehicle power supply unit via the power supply circuit and controls the control target actuator. In an electronic control circuit equipped with a microcomputer having a self-diagnosis function of its operation, it has a self-diagnosis function and outputs an output L for a short time immediately after the start of the sensor. ₀ A sensor that outputs a self-diagnosis signal including the signal to be used is connected to a microcomputer, and another power supply circuit is provided in the path for separately supplying power from the in-vehicle power supply unit to the sensor. When the signal adding means is connected to the detection circuit to output the sensor additional signal by the signal adding means simultaneously with the output of the self-diagnosis signal at the time of starting the sensor, the reset signal is input only to the microcomputer. Proper processing of sensor self-diagnosis signal, characterized in that the computer can determine whether the sensor is abnormal or only the microcomputer itself has been reset based on both the sensor self-diagnosis signal and the sensor additional signal. This is an in-vehicle electronic control circuit with functions.
[0019]
In this invention, power is sent from the power supply unit to the microcomputer and the sensor via respective separate power supply circuits, but no delay switch means is provided as in the first and second inventions. However, the sensor has a self-diagnosis function as in the second invention, and outputs a self-diagnosis signal including an output OFF signal for a short time immediately after activation of the sensor. In addition, since the sensor additional signal is added to the sensor signal, the microcomputer can identify each signal from the sensor and receive the signal immediately after the microcomputer is started. Whether the signal from the sensor is a normal signal or a signal including a self-diagnosis signal of a normal side fixing failure even at reset, correct processing is performed.
[0020]
Embodiment
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic block diagram of an in-vehicle electronic control circuit with a sensor self-diagnosis signal proper processing function according to the first embodiment. A microcomputer 11 used in the illustrated electronic control circuit 10 outputs a control signal for controlling an actuator (not shown) to be controlled. In this embodiment, a hydraulic circuit for controlling a wheel brake of an automobile. A plurality of solenoid valves provided in the inside are mainly controlled actuators. Combining the open and closed states of multiple solenoid valves, various sensors such as ASC control (Active Stability Control), ABS control (Antilock Brake System), and BA control (Brake Assist) are used as sensors. 14 is an electronic control circuit 10 of the apparatus which is performed based on the detection signal from 14.
[0021]
As shown in the figure, power is supplied from the battery B, which is an in-vehicle power supply unit, to the microcomputer 11 via the power supply circuit 12 and to the sensor 14 via the power supply circuit 13. Yes. The power supply circuits 12 and 13 are provided separately from the sensor power supply because the operating voltages of the microcomputer 11 and the sensor 14 are different or to protect the power supply of the microcomputer from noise, but the function is stabilized. A circuit for supplying power, which is basically the same functional member. A reset signal is input from the power supply circuit 12 from the line indicated by the symbol (6) in order to prevent the microcomputer from malfunctioning when the power supply voltage to the microcomputer 11 instantaneously becomes a low voltage for some reason. So connected.
[0022]
As shown in the figure, a delay switch means 15 is inserted in a line (3) for supplying power from the power supply circuit 13 to the sensor 14, and the delay switch means 15 is set by the input of a command signal (7) from the microcomputer 11. The power is supplied by turning it on. The sensor 14 is of a type having a self-diagnosis function, and a measurement signal from the sensor element 14a is input to the sensor circuit 14b, and a state circuit to be measured is detected from the measurement signal using a small microcomputer. 14c, the detection signal is sent to the control microcomputer 11 as a sensor signal (5), and a self-diagnosis circuit (14d) for self-diagnosis of the detection circuit (14c) including the sensor element is provided. ▼ is also sent to the microcomputer 11 through the same route as the sensor signal (5).
[0023]
The sensor element 14a of the sensor 14 is a pressure sensor in this embodiment, and its self-diagnosis signal is composed of a combination of Hi signals indicating that the operating voltage of the sensor element 14a and the detection circuit 14c itself is normal. If these self-diagnosis signals are not output (L ₀ Signal), either of which is faulty.
[0024]
According to the on-vehicle electronic control circuit with the sensor self-diagnosis signal proper processing function of this embodiment configured as described above, even if the self-diagnosis operation takes a long time when the microcomputer 11 is started, the self-diagnosis signal from the sensor is output. Receiving without ignoring, appropriate calculation processing based on the sensor signal is performed in accordance with the state indicated by the self-diagnosis signal of the sensor.
[0025]
When power is sent from the power supply unit, the microcomputer starts immediately via the power supply circuit 12, and first performs a self-diagnosis operation such as whether the operating voltage of the internal circuit is normal. If there is no abnormality as a result of the self-diagnosis, the signal reception permission for the sensor self-diagnosis signal (4) and sensor signal (5) from the sensor 14 is given to the input line, and a command signal (7) is output to delay the switch. The means 15 is turned on. As a result, power from the power supply unit is supplied from the power supply circuit 13 to the sensor 14.
[0026]
The sensor 14 supplied with power is also checked immediately after startup by the self-diagnosis circuit 14d for abnormalities such as operating voltage, disconnection, and short circuit of the sensor element 14a and the sensor circuit 14b, and the self-diagnosis signal (4) is used as the sensor. Output on the same line as signal (5). Therefore, the signal from the sensor 14 that starts in such an operation sequence and outputs a signal is received after the microcomputer 11 is ready to accept the input signal from the outside, and thus the microcomputer is not ignored. 11 and the subsequent calculation process can be executed properly and reliably.
[0027]
FIG. 2 shows the above operation timing as a time chart. From this figure, it can be seen that after the self-diagnosis is completed, the microcomputer 11 gives an external signal acceptance permission by the command signal (7) and accepts the sensor self-diagnosis signal (4) and the sensor signal (5).
[0028]
FIG. 3 is an overall schematic block diagram of an in-vehicle electronic control circuit with a sensor self-diagnosis signal aptitude processing function according to the second embodiment. The in-vehicle electronic control circuit with sensor self-diagnosis signal aptitude processing function of the second embodiment is the same as that of the first embodiment as a hardware configuration, but the function of the sensor 14 is slightly different. As in the first embodiment, this sensor 14 also has a sensor element 14a, a detection circuit 14c, and a self-diagnosis circuit 14d. Therefore, the sensor 14 has a self-diagnosis function. Is L ₀ A signal is output, but in order to determine whether there is a failure of normal side fixing (Hi fixing) for the output signal, an abnormal signal (L ₀ ) In that it has a function of outputting for a few seconds. This makes it possible to determine whether the self-diagnosis signal is normal or abnormal.
[0029]
In this embodiment, the sensor 14 having the self-diagnosis function is a combine sensor in which a G sensor, a lateral G sensor, and a yaw rate sensor are provided in an integrated type (combined type). It has a function of outputting a failure detection signal immediately after startup. This is because if an erroneous signal such as a normal-side fixing signal continues to be output, there is a possibility that a large error will occur in the contents of arithmetic control performed based on the signal from each sensor, which may directly lead to a serious accident. This is because it is necessary to increase the reliability of the signal. Therefore, not all sensors having a self-diagnosis function have the normal side fixing failure detection signal as described above.
[0030]
In this embodiment, the sensor 14 is started after the self-diagnosis of the microcomputer 11, and the self-diagnosis signal (4) and the sensor signal (5) from the sensor 14 are received in a state where the microcomputer 11 is ready to receive. It is the same as in the first embodiment that the timing of power supply to the sensor 14 is delayed by the command signal to optimize the input timing of the signal from the sensor (see the time chart of FIG. 4A). However, in this embodiment, when a reset signal is input only to the microcomputer 11 for some reason during traveling, the sensor signal {circle around (5)} is prevented so that the sensor self-diagnosis signal {circle around (4)} is not mistaken as an abnormal signal. Can be properly processed as a normal signal (see the time chart of FIG. 4B).
[0031]
As shown in FIG. 4B, when the reset signal (6) is input to the microcomputer 11, the command signal (7) is changed to a predetermined time L. ₀ At the same time, since the power supply to the sensor 14 is cut off, the output of the self-diagnosis signal (4) and sensor signal (5) of the sensor 14 is also turned OFF, but if the reset signal becomes Hi, the command signal (7) The self-diagnosis signal (4) and the sensor signal (5) also immediately return to Hi, and the self-diagnosis signal (4) remains at the constant time L as in the start-up. ₀ Thus, the microcomputer 11 recognizes that the sensor 14 is operating normally, and the subsequent control operation is appropriately performed.
[0032]
If the command signal {circle over (7)} and the delay switch means 15 are not provided as in the prior art, and therefore the power supply to the sensor 14 is not stopped by the command signal {circle over (7)}, the reset signal is sent to the microcomputer 11. Even if (6) is input, the power supply to the sensor 14 is not cut off. Therefore, the self-diagnosis signal (4) of the sensor 14 remains Hi, and the sensor signal (5) is also sent to the microcomputer 11 with Hi. However, in the microcomputer 11, since the self-diagnosis signal (4) is Hi, it is determined that the self-diagnosis signal (4) of the sensor 14 is in the abnormal state of the normal side fixing, and the sensor signal (5) is not received. Therefore, the sensor signal (5) from the sensor 14 is Hi in the microcomputer 11 even though it is Hi. ₀ Processing will be performed as the state. From the above, it can be seen that in this embodiment, the signal from the sensor 14 is reliably received and appropriate processing is performed at the time of start-up and during traveling.
[0033]
FIG. 5 is an overall schematic block diagram of an on-vehicle electronic control circuit with a sensor self-diagnosis signal aptitude processing function according to the third embodiment. In this embodiment, the electronic control circuit 10 is the same as the conventional one (no delay switch means is provided), but the configuration and function of the sensor 14 are different from the conventional one. The same members as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The sensor 14 has the same basic configuration and function as in the second embodiment, except that a signal addition circuit 14e is provided.
[0034]
The signal addition circuit 14e is added to the line of the sensor signal (5) from the detection circuit 14c, and is used to add an additional signal for the sensor signal (5) before the sensor signal is transmitted when the sensor 14 is activated. Is provided. This additional signal is for identifying a case where an abnormality has occurred in the self-diagnosis circuit 14d of the sensor 14, as will be described later. Since the basic function of the sensor 14 is the same as that of the second embodiment, as shown in FIG. 6A, when the reset signal (6) is input to the microcomputer 11 at the time of startup, the sensor 14 A self-diagnosis signal (4) and a sensor signal (5) are output. The self-diagnosis signal (4) indicates that there is no abnormality in the self-diagnosis and is output for a certain period of time. ₀ For the signal and sensor signal (5), L indicating that the signal is normal is output for a certain period of time. ₀ Since the signals are included, the microcomputer 11 determines that there is no abnormality in the sensor 14 from each signal, and the subsequent processing is performed using the sensor signal as a normal signal.
[0035]
As shown in FIG. 6B, when the reset signal (6) is inputted only to the microcomputer 11 during traveling, only when the signal (4) from the sensor 14 at that time is Hi (5). By confirming that the signal is Hi, the microcomputer 11 determines that only the microcomputer 11 has been reset, and the subsequent processing is not affected.
[0036]
As shown in FIG. 6C, when the self-diagnosis signal (4) is activated when a normal side fixing failure has occurred, the state of the normal side fixing failure is identified. In this case, the self-diagnosis signal (4) and the sensor signal (5) are activated almost immediately when the reset signal rises immediately after activation, but if the self-diagnosis signal (4) is malfunctioning in the normal side, the sensor 14 The sensor signal {circle over (5)} is output as an additional signal indicating that the sensor 14 is normal as long as the measurement operation itself of the sensor 14 is normal. Therefore, when the microcomputer 11 receives that the signal (4) remains Hi and the signal (5) is an additional signal, the microcomputer 11 determines that the self-diagnostic signal (4) has failed in the normal side. As a result, the sensor failure is judged and the subsequent sensor information is not used for the control, and the system is sometimes shut down.
[0037]
FIG. 7 shows an overall schematic block diagram of a modification of the in-vehicle electronic control circuit of the first embodiment. In this modification, the power supply circuit 13 is omitted, and the power supply circuit 12 is provided in common as the same power supply circuit for the microcomputer 11 and the sensor 14, but other than this point, the basic configuration and operation of the first embodiment are the same. The same. It should be noted that the circuit configuration for supplying power to the microcomputer 11 and the sensor 14 while omitting the power supply circuit 13 and sharing the power supply circuit 12 can be commonly applied to the second embodiment of FIG. 3 and the third embodiment of FIG. Obviously, a detailed description is omitted, but the same applies.
[0038]
【The invention's effect】
As described in detail above, the on-vehicle electronic control circuit according to the first aspect of the present application is configured to control the timing of power supply to the sensor when inputting a sensor signal having a self-diagnosis function to the microcomputer for self-diagnosis. By delaying the command from the delay switch means to send the sensor signal input in a timely manner so that the microcomputer does not misprocess the sensor signal, the microcomputer performs a self-diagnosis of the sensor self-diagnosis signal. Therefore, when it is not possible to receive the signal and it is possible to receive the signal, it is possible to avoid the inconvenience that the microcomputer erroneously processes a signal that is not self-diagnosis as a self-diagnosis signal. The effect is obtained.
[0039]
A vehicle-mounted electronic control circuit according to a second invention is based on the vehicle-mounted electronic control circuit according to the first invention, and the sensor has a self-diagnosis function and includes a signal that is output OFF for a short time immediately after activation of the sensor. Since the sensor that outputs the signal is used, the sensor is also reset using the delay switch means when resetting only the microcomputer. Therefore, the microcomputer correctly receives the self-diagnosis signal at the time of reset as well as immediately after startup. The effect that processing becomes possible is acquired.
[0040]
The on-vehicle electronic control circuit according to the third aspect of the invention supplies power to the microcomputer and the sensor via separate power supply circuits, and the sensor has a self-diagnosis function and outputs a short time L immediately after the sensor is started. ₀ As a sensor that outputs a self-diagnosis signal including a signal that becomes a sensor, and a sensor that outputs a sensor additional signal in response to the sensor signal, the microcomputer is locked at the time of start-up, reset, or normal side fixing of the sensor self-diagnosis signal Even at the time of start-up, since the sensor self-diagnosis signal and the sensor signal can be distinguished from each other, it is possible to avoid erroneous processing of the sensor signal and to perform appropriate processing.
[Brief description of the drawings]
FIG. 1 is an overall schematic block diagram of an on-vehicle electronic control circuit with a sensor self-diagnosis signal suitability processing function according to a first embodiment.
FIG. 2 is an explanatory diagram of the operation of the above.
FIG. 3 is an overall schematic block diagram of an in-vehicle electronic control circuit with a sensor self-diagnosis signal suitability processing function according to a second embodiment.
FIG. 4 is an explanatory diagram of the operation of an in-vehicle electronic control circuit with a sensor self-diagnosis signal suitability processing function according to a second embodiment.
FIG. 5 is an overall schematic block diagram of an in-vehicle electronic control circuit with a sensor self-diagnosis signal suitability processing function according to a third embodiment.
FIG. 6 is an explanatory diagram of the operation of the above.
7 is an overall schematic block diagram of a modification of the on-vehicle electronic control circuit with sensor self-diagnosis signal suitability processing function of the first embodiment. FIG.
8A is an overall schematic block diagram of an in-vehicle electronic control circuit having a sensor input of a conventional example, and FIG.
[Explanation of symbols]
10 Electronic control circuit
11 Microcomputer
12, 13 Power circuit
14 sensors
15 Delay switch
14a Sensor element
14b Sensor circuit
14c detection circuit
14d Self-diagnosis circuit

Claims (3)

A sensor having a self-diagnostic function is provided in an electronic control circuit including a microcomputer having a self-diagnosis function, which is supplied with power from an in-vehicle power supply unit via a power supply circuit and outputs a control signal for controlling an actuator to be controlled. A delay switch means is provided in the path for supplying power separately from the in-vehicle power supply unit to the sensor connected to the microcomputer. When a command signal is sent from the microcomputer supplied with power to the delay switch means, the power is sent to the sensor. After the self-diagnosis at the time of starting the computer, the microcomputer's signal reception permission is given to the sensor input line, the self-diagnosis signal at the time of starting the sensor is accepted, and when the reset signal is input to the microcomputer after the microcomputer starts The command signal to the switch means is turned off and Reset the sensor, restart the sensor after the microcomputer restarts, and after the microcomputer self-diagnosis, give the microcomputer signal reception permission to the sensor input line and accept the self-diagnosis signal when the sensor restarts An in- vehicle electronic control circuit with a sensor self-diagnosis signal proper processing function, characterized in that it is not mistaken for an original abnormal signal . Claim 1, characterized in that a sensor for outputting a self diagnosis signal containing an abnormal signal L _0, which is different from the Hi signal in the normal short time the sensor immediately after starting the sensor with the self-diagnostic function as a sensor signal The vehicle-mounted electronic control circuit with the sensor self-diagnosis signal proper processing function described in 1. An electronic control circuit equipped with a microcomputer having a self-diagnosis function, which is supplied with power from an in-vehicle power supply unit via a power supply circuit, outputs a control signal for controlling an actuator to be controlled, has a self-diagnosis function, A sensor that outputs a self-diagnosis signal including an abnormal signal L ₀ that is different from a normal Hi signal for a short time immediately after the start of the sensor is connected to a microcomputer, and a path for supplying power separately from the in-vehicle power supply unit to the sensor other power supply circuit is provided, so that the sensor outputs the abnormal signal L ₀ at the same time as the signal adding means of the sensor the additional signal of the sensor startup connect the signal adding means to a detection circuit for detecting a measurement signal from the sensor element If the reset signal is input only to the microcomputer, the microcomputer Or sensors based on both signals of the additional signal that abnormal, vehicle electronic control circuit with a sensor self-diagnosis signal proper processing function, characterized in that only the microcomputer itself is to be able to determine whether the reset is triggered.

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