JP3294894B2 - Evacuation traveling device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evacuation traveling device for a vehicle, and more particularly, to a vehicle equipped with an electronically controlled engine, which can safely drive the vehicle even when an abnormality occurs in control of an electronic throttle valve. The present invention relates to a possible evacuation traveling device for a vehicle.

[0002]

2. Description of the Related Art In recent years, control devices using microcomputers have been actively developed, and many on-vehicle control devices have been developed. Conventionally, the throttle valve of an internal combustion engine has been mainly of a mechanical type whose opening is linked to the opening of an accelerator pedal, but recently, an electronically controlled throttle valve device (hereinafter referred to as an electronic throttle valve) has been put into practical use. ing.
In this electronic throttle valve, the microcomputer calculates an optimum throttle valve opening degree based on parameters indicating the operation state of the engine, for example, the engine speed, the intake manifold negative pressure, etc., in addition to the depression amount of the accelerator pedal. The actuator controls the opening of the throttle valve so that the calculated opening of the throttle valve is obtained.

With such an electronic throttle valve, there is no problem when the microcomputer is operating normally, but if the microcomputer does not operate normally depending on the operating state of the engine, an appropriate throttle valve opening can be calculated. Or the actuator cannot be controlled to an appropriate throttle valve opening. Therefore, in the conventional electronic throttle valve, a link mechanism for interlocking the throttle valve and the accelerator pedal is provided separately. When the microcomputer is operating normally, its operation is stopped by the clutch device. I have.
Then, only when an abnormality of the microcomputer is detected, the clutch device operates to connect the throttle valve and the accelerator pedal.

[0004]

However, in a vehicle equipped with the conventional electronic throttle valve configured as described above, a link connecting the accelerator pedal and the throttle valve in a system different from the actuator for driving the throttle valve. Since the apparatus is required, there is a problem that it is disadvantageous in terms of cost.

[0005] Therefore, a link device for connecting the accelerator pedal and the throttle valve in a system different from the actuator for driving the throttle valve is eliminated, and the throttle valve is fully closed when the computer or the actuator for driving the throttle valve is abnormal. However, there is a problem in that this makes it impossible for the vehicle to perform evacuation when the vehicle is abnormal.

The present invention eliminates the need for a link device that connects the accelerator pedal and the throttle valve in a different system from the actuator that drives the throttle valve. It is an object of the present invention to provide an evacuation traveling device capable of safely performing traveling for evacuation.

[0007]

[MEANS FOR SOLVING THE PROBLEMS]
The evacuation travel device vehicles of light, comprising a bypass passage bypassing the throttle valve provided in an intake passage, an accelerator pedal and a throttle valve of the electronic throttle valve in the electronically controlled internal combustion engine which is not mechanically connected An evacuation traveling device that can safely drive a vehicle when an abnormality occurs, comprising: accelerator opening detection means for detecting an amount of depression of an accelerator pedal; throttle opening detection means for detecting an opening degree of a throttle valve; Slot valve interlocking determination means for determining whether the throttle opening is controlled in conjunction with the opening, and fully closing the throttle valve in the event of an abnormality in which the throttle opening is not controlled in conjunction with the accelerator opening A throttle fully closing means for controlling the flow rate control valve provided in the bypass passage at the time of the abnormality; And feeding means, it is previously stored in the abnormal state
The fixed injection amount is read and the fixed injection amount is
Output correction means for correcting according to the opening degree of the steering wheel .

[0008]

[0009]

According to the evacuation and traveling device for a vehicle of the present invention, when an abnormality is detected in a computer or an actuator for driving an electronic throttle valve , the throttle valve is controlled to a fully closed state.
Is your and Rutotomoni is the air passage is fully opened to bypass the throttle valve, a fixed injection amount stored in advance is
The fixed injection amount is read out and corrected according to the accelerator opening . As a result, even in the event of an abnormality, the vehicle can perform a minimum evacuation run.

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall schematic diagram showing an electronically controlled internal combustion engine provided with a vehicle limp-home system according to the present invention. In FIG. 1, an air flow meter 3, a throttle valve 12, and a fuel injection valve 7 are provided in the intake passage 2 of the engine body 1 in this order from the upstream side of the intake passage 2.

The air flow meter 3 directly measures the intake air amount Q, and generates an analog voltage output signal proportional to the intake air amount by a built-in potentiometer. This output signal is supplied to an A / D converter (A / D) 101 with a built-in multiplexer of the control circuit 10.
The throttle valve 12 closes during idling operation, and its opening increases as the engine load increases. The throttle valve 12 is not mechanically connected to the accelerator pedal 20, and the control circuit 1
It is driven by an actuator 15 controlled by 0. The throttle valve 12 has a built-in potentiometer 13, which outputs a voltage proportional to the opening of the throttle valve 12, and is provided with an idle switch 14 for detecting the full closing of the throttle valve. The potentiometer 13 is connected to the A / D converter 101, and the idle switch 14 is connected to the input / output interface (I
/ O) 102. The fuel injection valve 7 is provided for each cylinder, and when energized, opens to supply pressurized fuel to the intake port.

Then, as described above, the accelerator pedal 20
Is not communicated with the throttle valve 12, so that the depression amount of the accelerator pedal 20 (accelerator opening θacc) is A
/ D converter 101. The intake passage 2 is provided with a main bypass passage 18 having an air flow control valve 16 and a sub bypass passage 19 having an adjusting screw 17 so as to bypass the throttle valve 12. The opening of the air flow control valve 16 provided in the middle of the main bypass passage 18 and adjusting the amount of air flowing through the bypass passage 18 is controlled by an electric signal from the control circuit 10. . Further, the air flow control valve 16 is connected to an input / output interface 102 of the control circuit 10.

An analog voltage proportional to the engine water temperature ThW is generated by a water temperature sensor 11 attached to a cylinder block of the engine, and is supplied to an A / D converter 101. The distributor 4 includes a crank angle sensor 5 whose axis generates a reference position detection pulse signal every 720 ° in terms of crank angle, for example, and an angular position detection pulse signal in every 30 degrees which is converted into crank angle. Is provided. The pulse signals of the crank angle sensors 5 and 6 are supplied to an input / output interface 102 of the control circuit 10, and the output of the crank angle sensor 6 is supplied to an interrupt terminal of the CPU 103.

In the exhaust passage 8 of the engine, there is provided an O ₂ sensor 9 for generating an electric signal corresponding to the concentration of the oxygen component in the exhaust gas. The output of the O ₂ sensor 9 is supplied to the input / output interface 102 via the buffer circuit 109 of the control circuit 10 and the comparison circuit 110. In addition, 21
Is a spark plug provided in the engine body 1, the ignition timing that are controlled in the control circuit 10. An abnormality lamp 112 is provided on an instrument panel or the like in a driver's seat for displaying an abnormality of the throttle valve 14 to an occupant of the vehicle. The abnormality lamp 112 is turned on by the drive circuit 111 when an abnormality signal is output from the input / output interface 102 when the throttle valve 14 is abnormal.

The control circuit 10 is constructed using, for example, a microcomputer, and includes an A / D converter 101, an input / output interface 102, a CPU 103, a buffer circuit 10
9, in addition to the comparison circuit 110 and the drive circuit 111, the ROM 1
04, a RAM 105, and the like are provided. In the control circuit 10, a down counter 106, a flip-flop 107, and a drive circuit 108 are for controlling the fuel injection valve 7, and correspond to the calculated value of the fuel injection amount TAU. The fuel injection valve 7 is energized to feed fuel into the combustion chamber of the engine body 1 in an amount corresponding to the fuel injection amount TAU, but the description of the operation is omitted.

The CPU 103 generates an interrupt when the A / D converter 101 completes A / D conversion, when the input / output interface 102 receives a pulse signal from the crank angle sensor 6, and the like. Also, the intake air amount data Q of the air flow meter 3, the throttle valve opening θth, and the accelerator opening θac
c, the oxygen concentration signal and the like are taken in by an A / D conversion routine executed every predetermined time and are updated and stored in a predetermined area of the RAM 105.

Next, when the throttle valve in the electronically controlled internal combustion engine configured as described above is abnormal, the control circuit 10
Will be described with reference to the flowcharts of FIGS. 2 to 4. The abnormality of the throttle valve 12 includes an abnormality in which the throttle valve 12 does not move from the fully closed state due to a failure of the control circuit 10 or a failure of the actuator 15, and an abnormality in which the throttle valve 12 moves regardless of the depression amount of the accelerator pedal 20. Can be considered. Therefore, a control procedure when the throttle valve is abnormally fully closed, or a procedure for controlling the throttle valve to fully closed when the throttle valve moves regardless of the depression amount of the accelerator pedal 20 will be described with reference to FIG.

In step 201, first, the accelerator opening θ
The operating state parameters of the engine, such as acc, throttle valve opening θth, engine speed Ne, and intake air amount Q, are read.
In the following step 202, it is determined whether or not the throttle valve 12 is abnormal. The abnormality of the throttle valve 12 is determined based on whether or not the accelerator opening θacc and the throttle valve opening θth substantially match.

In step 202, the throttle valve 12
If it is determined that is not abnormal, the routine proceeds to step 203, where normal control (throttle valve control, fuel injection control,
And ignition timing control), and this routine ends. On the other hand, in step 202, the throttle valve 1
2 is determined to be abnormal, the abnormal lamp 112 is turned on in step 204 and the subsequent step 20
At 5, the throttle valve 12 is fully closed. With this control, when the throttle valve 12 stops moving from fully closed, the throttle valve 12 is fully closed when the throttle valve moves regardless of the depression amount of the accelerator pedal 20.

In this case, in step 206, the air flow control valve 18 (shown as a bypass valve in FIG. 2) of the main bypass passage 18 that bypasses the throttle valve 12 is controlled to a fully opened state. When the adjusting screw 17 (shown as an ISC valve in FIG. 2) provided in the sub bypass passage 19 can be adjusted by the control circuit 10, the adjusting screw 17 is also controlled to be fully opened.

In the following step 207, R
The fixed injection amount stored in the ROM 104 is stored in a predetermined area RAM1 of the AM 105, and is stored in another area RAM1.
2 stores the basic ignition timing stored in the ROM 104. Then, in step 208, it is determined whether or not the accelerator opening θacc is fully opened, that is, whether or not the accelerator pedal 20 is fully depressed.

If the accelerator opening .theta.acc is fully open, the routine proceeds to step 209, where a predetermined area R
A coefficient K larger than 1 is added to the fixed injection amount stored in AM1.
(For example, 1.2) to increase the fixed injection amount, and newly store it in the area RAM1. Similarly, RAM1
05 is multiplied by a coefficient L to the basic ignition timing stored in another area RAM2 to advance the basic ignition timing, and this is newly stored in the area RAM2. By increasing the fixed injection amount and advancing the ignition timing, the torque of the engine can be increased.

As described above, when the accelerator opening θacc is fully open, the injection amount is increased in step 209, the ignition timing is advanced, and the routine proceeds to step 210, where the accelerator opening θacc
If acc is not fully opened, the process proceeds from step 208 to step 210 as it is. In step 210, the RAM 10
5, the fuel is injected with the fuel injection amount stored in the predetermined area RAM1, and the engine is driven by the ignition timing stored in another area RAM2.

As described above, when the throttle valve 12 is fully closed or when the throttle valve 12 is controlled to be fully closed, intake air is supplied from the main bypass passage 18 or the sub bypass passage 19 to the engine body 1. Thus, the engine can be driven and the vehicle can be evacuated. When the vehicle is approaching a hill or there is a step, the engine torque can be increased by fully depressing the accelerator pedal. Can be

Next, a control procedure in which the throttle valve is not fully closed when the throttle valve is abnormal will be described with reference to FIG. Step 201 to Step 20 in this procedure
4 is the same as that in FIG. 2, the description thereof will be omitted, and the description will be started from step 300 performed after step 204.
In step 300, it is determined whether or not the opening of the throttle valve 12 is greater than 50%. 50% throttle opening
In the following cases, the throttle valve 1
2 is fixed at the opening degree at that time. And
In step 302, a target engine output Paim is calculated from the accelerator opening θacc. In the following step 303, the actual engine output Pre is determined from the engine speed Ne and the torque characteristics of the engine stored in the ROM 104.
Is obtained by calculation.

In step 304, the magnitude of the target engine output Paim and the actual engine output Pre are compared. If the actual engine output Pre is less than the target engine output Paim, it is determined that the engine output is insufficient. In step 305, the fuel injection amount of the engine is increased, and then in step 306
In this case, the ignition timing is advanced, and this routine ends. Note that either step 305 or step 306 may be performed.

If the actual engine output Pre is larger than the target engine output Paim in step 304,
It is determined that the output of the engine is too large, and the fuel injection amount of the engine is reduced in step 307. In step 306, the ignition timing is retarded, and this routine ends. Note that either step 307 or step 308 may be executed.

On the other hand, if the throttle valve opening is greater than 50% in step 300, the process proceeds to step 309, where the throttle valve is fully closed. This prevents the vehicle from overrunning due to the rapid depression of the throttle valve 12. In this case, this routine is performed with the throttle valve 12 fully closed.
The process may be ended, or the process may proceed to step 302 to execute the same control as the above-described control.

FIG. 4 shows a modified embodiment of the control procedure shown in FIG. In this embodiment, in order to prevent running hunting of the vehicle at the time of evacuation running, step 3 shown in FIG.
Insert step 401 between step 03 and step 304,
The actual engine output Pre is a predetermined range α of the target engine output Paim.
If the value is within the range, the routine is terminated.

In the embodiment described above, the case where the control circuit 10 performs all controls has been described. However, as shown in FIG. 5, the control circuit 10 includes an ECU (engine control controller) 10 'and an electronic throttle controller 30. May be provided separately. In such a case, the electronic throttle controller 30 drives the throttle valve 12 via the step motor 31, the signal of the accelerator opening θacc from the accelerator pedal 20 and the throttle valve opening from the throttle valve opening sensor (potentiometer) 13. The signal of the degree θth is input to both the ECU 10 ′ and the electronic throttle controller 30. When the throttle valve 12 is abnormal, an abnormality detection signal is output from the electronic throttle controller 30 to the ECU 10 ′. When the throttle valve 12 is abnormal, the electronic throttle controller 30 fixes the throttle valve 12 by energizing only one phase of the step motor 31. be able to.

FIG. 6 shows an example of a circuit for judging whether or not the accelerator opening θacc and the throttle valve opening θth in step 202 of the above-described embodiment coincide. This circuit has two comparators 61 and 62 and a low-pass filter 63. The positive input terminals of the comparators 61 and 62 each include a signal obtained by subtracting a predetermined voltage from the accelerator opening signal and a signal obtained by adding a predetermined voltage. Has been applied. With this circuit, the difference between the opening (voltage) of the throttle valve opening θth and the accelerator opening θacc is equal to or more than a certain level and can be continued for a certain period of time to obtain an abnormality detection signal.

[0032]

As described above, according to the present invention,
In a vehicle equipped with an electronically controlled internal combustion engine in which the throttle valve is driven and controlled only by the actuator, when the computer or the actuator that drives the throttle valve becomes abnormal, the vehicle can safely travel for the minimum evacuation. There is an effect that can be.

[Brief description of the drawings]

1 is a configuration diagram showing a schematic configuration of a tower mounting the electronic control type engine the evacuation travel equipment of a vehicle of an embodiment of the present invention.

FIG. 2 is a flowchart showing an evacuation traveling procedure when an abnormality occurs when a throttle valve of the control circuit of FIG. 1 is fully closed.

FIG. 3 is a flowchart showing a limp-home running procedure when the throttle valve of the control circuit of FIG. 1 is not fully closed;

FIG. 4 is a flowchart of a modified example of the flowchart in FIG. 3;

FIG. 5 is a configuration diagram showing a signal flow when the control circuit of FIG. 1 is separated into two;

FIG. 6 is a circuit diagram showing an example of a circuit for determining whether or not an accelerator opening and a throttle valve opening match;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine main body 2 ... Intake passage 3 ... Air flow meter 7 ... Fuel injection valve 10 ... Control circuit 12 ... Throttle valve 13 ... Potentiometer 14 ... Idle switch 15 ... Actuator 16 ... Air flow control valve 17 ... Adjusting screw 18 ... Main bypass Passage 19: Sub bypass passage 20: Accelerator pedal 112: Abnormal lamp

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-56941 (JP, A) JP-A-61-8441 (JP, A) JP-A-2-286837 (JP, A) JP-A-3- 182667 (JP, A) JP-A-4-265431 (JP, A) JP-A-4-166642 (JP, A) JP-A-4-166634 (JP, A) JP-A-6-264800 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) F02D 41/00-45/00 F02P 5/15 F02D 9/00-11/10

Claims (1)

(57) [Claims] 1. A vehicle according to claim 1, further comprising: a bypass passage that bypasses a throttle valve provided in an intake passage, wherein when an electronic throttle valve is abnormal in an electronically controlled internal combustion engine in which an accelerator pedal and a throttle valve are not mechanically connected. An evacuation traveling device capable of traveling safely, comprising: accelerator opening detection means for detecting an amount of depression of an accelerator pedal; throttle opening detection means for detecting an opening of a throttle valve; A throttle valve interlock determining means for determining whether or not the degree is controlled in conjunction with the throttle, and a throttle for controlling the throttle valve to a fully closed state when the throttle opening is not controlled in conjunction with the accelerator opening. Full-close means, and abnormal-time intake supply means for controlling the flow control valve provided in the bypass passage to a fully-open state at the time of the abnormality. Read out a fixed injection quantity which is previously stored at the time of the abnormality
And an output correction means for correcting the fixed injection amount according to the accelerator opening .