JPS61220947A - Car controller having trouble diagnosing function - Google Patents

Abstract

PURPOSE:To easily diagnose troubles by judging by judging means if the input supplied into an input means into which the result of the detection is input from a various sorts of detectors is varied or not when the start of the diagnosing troubles is instructed and outputting the kind of the input which is varied on judgement. CONSTITUTION:In the ordinary traveling state of a car, each detection signal of a various sorts of detectors installed into each part of the car is input into a control means (b) through an input means (a), and the car is controlled by driving a various sorts of apparatuses by the control signals obtained by the means (b). When the instruction for starting the diagnosis for troubles is input for the inspection and repair of the car, the instruction is detected by a trouble diagnosis instruction means (c), and the result is transmitted into a judging means (d). The judging means (d) successively detects a various sorts of the input supplied into the input means (a), and it is judged if a various sorts of inputs are varied or not, and the kind of the varied input and the state of variation of the input are outputted in a prescribed form from a diagnostic-data output means (e) on the basis of the result of the judgement.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle-side device having a failure diagnosis function that allows easy confirmation of input/output circuits.

[Background Art] With the recent advances in electronic technology, the computerization of vehicle control devices has progressed, and highly accurate and complex control has come to be performed on a variety of control objects. The vehicle control device has fuel injection amount control, ignition timing control, fuel injection timing control, idle speed control,
Development began with engine control devices such as exhaust gas recirculation control, and now control of turbochargers, superchargers, etc. is also being performed, and optimal engine control is being realized. Furthermore, regarding the transmission, electronic control of the automatic transmission is performed, and anti-skid control, acceleration slip control, electronic control of the suspension, etc. are implemented in the driving system. Furthermore, electronic control for information display inside the vehicle interior, electronic control to improve comfort, and even electronic control aimed at autonomous driving have been proposed and realized.

However, as mentioned above, various electronic vehicle control I
As the number of control devices increases, the number of input signals and output signals of I-devices increases, and the configurations of the input/output circuits that process these signals also become more complex. For this reason, when checking the functionality of vehicle control devices during each process such as production and inspection at the factory, or during maintenance in the field, specialized testing machines with sufficient functionality and accuracy or advanced This requires engineers with specialized knowledge, making the work extremely difficult.

For this reason, some of the vehicle control devices described above have a self-diagnosis function. For example, in a vehicle control device to which a microcomputer is applied, by incorporating a hardware failure detection program, it is possible to periodically or When detected by a separate dedicated failure detector, by inputting a check signal, the failure detection program inputs the status of all inputs and no inputs, and compares it with the internal check pattern. , Japanese Patent Laid-Open No. 166401/1989 discloses a device that can determine whether a failure has been detected in either the input/output section or the calculation section by determining whether the input/output section or the calculation section is normal. Japanese Patent Laid-Open No. 56-4780 discloses a device configured to perform failure diagnosis for each check item under specific operating conditions based on a check program, and display the diagnosis results on a display unit in association with the check items.
Publication No. 5 etc. have been proposed.

[Problems to be Solved by the Invention] By the way, especially regarding the input/output circuit of the vehicle control device as described above, as the number of control objects increases, the number of input/output signals increases, so the input/output circuit also becomes complicated. Therefore, there is a problem in that it is difficult to check the function of the input/output circuit in a vehicle (with the above vehicle control device installed).

In addition, in conventional vehicle control devices with self-diagnosis functions, various types of information are output continuously, and it takes time to understand the correspondence between input and output signals. There was also the problem that it was difficult to do so.

For example, even if any of the input/output signals of the vehicle control device becomes abnormal, if the abnormal signal has little effect on the vehicle during normal driving, the driver may If the driver does not notice the abnormality and continues to drive the vehicle, the original functions of the vehicle control device will not be fully utilized. If this is not done, there is a risk that damage to the faulty part will progress.

In addition, due to the above-mentioned background, it is necessary to add a function to the vehicle control device that allows failure diagnosis of its input/output circuit to be easily performed on-site in a short time without using special equipment. was desired.

[Means for Solving the Problems] Means for solving the above problems will be explained based on FIG. 1. FIG. 1 is a block diagram showing the basic concept of the present invention. As shown in FIG. 1, the present invention comprises: an input means a for inputting detection results from one or more detectors provided in each part of the vehicle; Control means for controlling the vehicle comprises: failure diagnosis instruction detection means C for detecting an instruction to start failure diagnosis;
and a determination means d for determining whether or not the input to the input means a has changed when the failure diagnosis instruction detection means C has detected the instruction to start the failure diagnosis; The gist of the present invention is to provide a vehicle control device having a failure diagnosis function, characterized in that it includes: diagnostic data output means e that outputs the type of input that has changed when it is determined that the input has changed.

Here, the diagnostic data output means e may be composed of a dedicated output circuit, for example.

Furthermore, the diagnostic data output means e may also serve as an output circuit for the control means, for example.

Note that the diagnostic data output means e may output, for example, the type of input that has changed and also display the state of the change at the same time.

[Effect] Next, the operation of the present invention will be explained based on FIG.

In the vehicle control device having a failure diagnosis function of the present invention, when the vehicle is in a normal running state, the detection results of various detectors provided in various parts of the vehicle are input to the input means a. Based on the detection results input to the input means a, the control means controls the vehicle by, for example, driving various devices provided in various parts of the vehicle.

On the other hand, when the vehicle is not in a normal running state, for example, when inspecting the vehicle or repairing the vehicle, an instruction to start failure diagnosis is input. Then, the fault diagnosis instruction detection means C detects the above instruction and transmits to the determination means d that the fault diagnosis state is present. Then, the determining means d sequentially detects various inputs to the input means a. Then, it is determined whether or not the various inputs have changed, and the result is transmitted to the diagnostic data output means e. When there is an input that is determined to have changed by the determination means d, the diagnostic data output means e outputs the type of input that has changed and, for example, the state of change of the input, from various output terminals. Output in the format. Here, the various output terminals may be, for example, specially provided output terminals, or, for example, a path S that also serves as an output terminal of the control means.

It may be something. Roughly speaking, the predetermined format may be, for example, a flashing check lamp or a 4-bit binary code. As described above, the technical problems of the present invention are solved.

[Example] Next, a preferred example of the present invention will be described based on the drawings.

FIG. 2 is a system configuration diagram of an internal combustion engine control device for a four-cylinder engine having a failure diagnosis function, which is an embodiment of the present invention.

In the figure, various controls are mainly carried out by a one-chip microcomputer (hereinafter simply referred to as OMC) in which a main memory and an interface circuit are integrated on a processor chip.

)1.

0MC1 inputs and calculates data detected by various sensors installed in each part of the vehicle according to a control program, and also performs processing to control the vehicle by driving various devices installed in each part of the vehicle. Central processing unit (hereinafter simply referred to as CPU) >1a
, a read-only memory (hereinafter simply referred to as ROM) 1b in which the above control program and various initial data are stored in advance, and various data, calculation data, and data necessary for calculation control that are input from the outside to 0MC1 at any time. Random access memory (hereinafter simply referred to as RA) in which RA is temporarily stored
It's called M. 1c, and a backup random access memory (hereinafter simply referred to as backup RAM) backed up by a battery so as to retain various data necessary for controlling the vehicle after the vehicle key switch is turned off by the driver. >1d.

0MC1 also includes multiplexer 3 and A/
The detection signals of various sensors are sent to the CPU 1a via the D converter 4.
and the multiplexer 3 from the CPU 1a.
, an input/output port 1e that outputs a control signal to the A/D converter 4, and an external interrupt port 1f that inputs a signal from the input circuit 2 (described later) as an interrupt signal and sends it to the CPLlla.
, an input/output port 1q which outputs a control signal to a serial input circuit 5, which will also be described later, and which sequentially inputs data from the serial input circuit 5 and sends it to the CPU 1a, a conveyor register, etc. When the values match with the conveyor register, an interrupt occurs and output port 1h outputs various data from CPLlla to each output circuit 6, 7.8, which will be described later, and a control signal is sent to the serial circuit 9, which will also be described later. An output port 1i that sequentially outputs data from the CPU 1a is also provided.

Roughly speaking, 0MC1 is a path line 1j that serves as a path for control signals and data, and ROM1b, RA including CPUA.
The clock circuit 1 sends clock signals serving as control timing to the serial input circuit 5 and the like at predetermined intervals.

Among the various sensors installed in each part of the vehicle, there is an air flow meter AFM installed in the intake system of the 4-cylinder engine to detect the amount of intake air, and a vehicle DC power supply BD that serves as a power source for the 4-cylinder engine and other devices in the vehicle. A cooling water temperature sensor WTS is installed in the cooling system of a cylinder engine to detect the cooling water temperature, an intake temperature sensor ATS is installed to detect the temperature of intake air, and an intake air temperature sensor ATS is installed in a four-cylinder engine to detect the opening of the throttle valve. Throttle position sensor TP
S is an air flow sensor signal @U, a battery voltage signal 10B/4, a cooling water temperature sensor signal @THW, and an intake air temperature sensor signal TI-, which are analog signals as detection data.
IA, outputs throttle position sensor signal VTA. These analog signals are sent to each buffer 2a provided within the input circuit 2.

2b, 20.2d, and 2e are first input. and,
Each of the above signals is sent to 4 [m5e
cl is selected for each cl, and the analog signal is converted into a digital signal by the A/D converter 4, and the above-mentioned 0
It is transmitted to the CPU 1a via the input/output port 1e of the MC1.

Additionally, a cylinder discrimination sensor C8 is provided in a distributor connected to the crankshaft of a four-cylinder engine to discriminate between cylinders, and a rotation angle sensor A detects the engine speed.
s, and a vehicle speed sensor SM built in the transmission that detects vehicle speed, respectively have a cylinder discrimination signal G, a crank angle rotation signal @Ne, and a vehicle speed sensor signal SPD, which are square waves.
Output. Each of these square wave signals is input to a waveform shaping circuit 2f provided within the input circuit 2. Then, the cylinder discrimination signal G is changed to the rotation angle signal N for every 720 degrees of crank angle.
e generates an interrupt process every 30 degrees of crank angle, and the vehicle speed sensor signal SPD generates an interrupt process every output shaft rotation, and the external interrupt boat 1f of 0MC1 mentioned above is generated.
The data is transmitted to the CPU'a via the CPU'a.

In addition, the starter STS, which detects when the 4-cylinder engine is starting, is installed as a sensor in each part of the vehicle.
, full-throttle switch ISW that detects the engine idle state, neutral safety switch NSS that detects the shift position of the transmission, air conditioner switch AC8 that detects the operating state of the air conditioner, The oxygen concentration sensor O8 detects the oxygen concentration in the gas, the brake switch BS installed in the brake pedal bracket detects the brake operating state, and the test mode terminal TS inputs a command when starting a test of the internal combustion engine control device. , a starter signal S which is a digital signal as detection data, respectively.
Outputs TA, throttle 'close switch signal 1dQ, neutral safety switch signal NSW, air conditioner signal A/C1 oxygen concentration signal @Ox, brake signal STP, and test mode signal T. These digital signals are manually input to the serial input circuit 5 as needed. The serial input circuit 5 is composed of a buffer circuit that serially transfers parallel input. Then, the load signal @LD is sent to the serial input circuit 5 from the input/output port 1g of the 0MC1 mentioned above at a low level (Low level) every 4 [m5eC].
1-evel), each digital signal is sequentially input from the serial input circuit 5 to the input/output port 1q as a serial output signal 5OUT, and is transmitted to the CPtJ1a.

On the other hand, from the output port 1h of the 0MC1 mentioned above, an interrupt occurs at a predetermined time and a control signal is sent to each output circuit.
．． 8 is output. Each of these output circuits 6, 7, and 8 is composed of an amplifier and a drive circuit for control signals for various drive devices disposed in various parts of the vehicle.

The output circuit 6 outputs a first cylinder fuel injection signal #10, a second cylinder fuel injection signal #20, a third cylinder fuel injection signal #30, and a third cylinder fuel injection signal #30 in order to perform fuel injection independently for each of the four cylinders. The four-cylinder fuel injection signal #40 is output to the first cylinder fuel injection valve INJ1, the second cylinder fuel injection valve INJ2, the third cylinder fuel injection valve INJ3, and the fourth cylinder fuel injection valve INJ4, respectively.

In addition, from the output circuit 7, a high level (1-1high level) is output from 30 degrees of crank angle before the predetermined ignition timing.
), and the ignition timing is low level (1ow 1
The energized ignition signal IGt which becomes eVel) is the igniter IG
is output to.

Furthermore, the output circuit 8 outputs a negative pressure switching valve (VSV) drive signal ISO at a predetermined duty ratio every 8 m5ecl to the negative pressure switching valve AVSV that adjusts the opening of the air control valve (ACV). be done. Therefore, in the engine idle state, the air control valve (AC
The amount of intake air is controlled by adjusting V>. Similarly, from the output circuit 8, F3 [m5eC]
At each time, a negative pressure switching valve (VSV) drive signal ERG is outputted at a predetermined duty ratio to the negative pressure switching valve EVSV that adjusts the opening degree of the ERG control valve (ERGCV). Therefore, exhaust gas recirculation control is performed by adjusting the ERG control valve provided in the exhaust gas recirculation path.

Further, from the above-mentioned one output port 11, a clock signal CLK and an output data signal DATA are output.

The control signal @LOAD is sequentially output to the serial output circuit 9 according to the instructions of the program. The serial output circuit 9 is composed of a shift register that outputs serial input in parallel. Then, the serial output circuit 9
The output signals of are respectively input to the output circuit 10. The output circuit 10 is a circuit for amplifying a signal, 11.12.1
3 and high-speed circuits 14 and 15.

Throttle opening signals L1, L2, and L3 are output from circuits 11, 12, and 13, respectively, to the transmission control computer TMC. The transmission control computer TMC determines the shift point and lockup point based on these signals and controls the shift and lockup operations. Further, the circuit 14 outputs a check lamp signal W to a check lamp C[ provided on the instrument panel. Roughly, circuit 1
5 connects the diagnostic display signal VF to the diagnostic display terminal D.
Output to T.

Next, details of the above-mentioned circuit 14 will be explained based on FIG. As shown in the figure, the circuit 14 includes an input terminal 14a, a transistor 14b1, and a Darlington-connected transistor 14.
It consists of a C1 output terminal 14d, a resistor, etc. When a low level (LOW 1-eVel) signal is input from the serial output circuit 9 to the input terminal 14a, the transistor 14b first becomes conductive (ON).

As a result, the Darlington-connected transistor 14c also becomes conductive (ON). Therefore, the circuit extending in the forward direction from the output terminal 14d to the Darlington-connected transistor 14c is closed. One terminal of the above-mentioned check lamp CL is connected to the output terminal 14d, and the other terminal is connected to the power source. Therefore, a current flows through the above circuit, and the check lamp CL changes to a point fIt'Tj. On the other hand, when a high level (Hioh Level) signal is input from the serial output circuit 9 to the input terminal 14a, the transistor 14b and the Darlington-connected transistor 14C are both turned off (OFF>), the circuit is opened, and the check is performed. The lamp CL goes out.

Next, details of the above-mentioned circuit 15 will be explained based on FIG. As shown in the figure, the circuit 15 includes an input terminal 15a1, a capacitor 15b, a resistor 15C115d, and an output terminal 15e.
, and other resistors. When the input terminal 15a is opened by the serial output circuit 9, the capacitor 15b is charged by the power supply VCC (eg, 5.0 [V]) via the resistors 15c and 15d, and the output 15e is Voltage is generated. On the other hand, when the input terminal 15a is grounded by the serial output circuit 9, the capacitor 15b is discharged via the resistor 15d.
The voltage at output terminal 15e drops. In this way, when the capacitor 15b is charged and discharged, the time constant changes depending on whether the resistors 15c and 15d are included in the circuit or only 15d. For this reason, for example, the input terminal 15a is connected to the input terminal 15a by the serial output circuit 9, for example, 4 [m
If it is always grounded every 5ecl, the potential of the output terminal 15e will be O.
[V], and for example input terminal 15a, 4 [m
If the input terminal 15a is kept open every 5 ecl, the potential of the output terminal 15e becomes 5.0 [V], which is equal to Vcc.If the input terminal 15a is kept open or grounded every 4 [m5 ecl], the potential of the output terminal 15e becomes 5.0 [V], which is equal to Vcc. potential is 0
[V]~5. It can be set to a desired value between O[V]. In this way, it is possible to output signals of three types of potential, such as 0 [V], 2.5 [V, ], and 5°0 [V], to the above-mentioned diagnostic display terminal DT. Become.

Next, the process executed by the above 0MC1 will be explained in detail based on the flowchart of FIG.

Note that the three-digit number in parentheses indicates the step number of each process. This process is executed repeatedly, for example, every 50 m5ec, following a known main control process for an internal combustion engine.

When this process is executed, first, the rotation angle signal Ne output from the rotation angle sensor AS is detected, and the engine rotation speed is calculated based on the rotation angle signal Ne (100).

Here, the engine rotation speed is calculated from the reciprocal of the interval between the rotation angle signals Ne stored in the RAM 1c.

Next, it is determined whether the engine speed calculated in step 100 is Q(r, p, m] (102)
. If this condition does not apply, this process ends. On the other hand, if the condition of step 102 is met, the process proceeds to step 104. Here, the vehicle speed sensor signal SPD output from the vehicle speed sensor SM is detected, and the vehicle speed is calculated based on the vehicle speed sensor signal SPD (104). Here, the vehicle speed is determined by the interval of the vehicle speed sensor signal SPD in RAM1.
c and is calculated from its reciprocal. Next, it is determined whether the vehicle speed calculated in step 104 is O [km/old] (106). If this condition does not apply, this process ends. On the other hand, if the condition of step 106 is met, the process proceeds to step 108.

Here, the test mode signal T output from the test mode terminal TS is detected (108). Then, it is determined whether the test mode signal T is at a high level (ON) (110). If this condition does not apply, this process ends. On the other hand, if the conditions in step 110 (if applicable) proceed to step 112, and the process executed by 0MC1 shifts to the test mode.
00 to 110), when the engine is running and the vehicle is running, the test mode terminal TS is set to high level (ON) due to the influence of noise etc.
), the process executed by 0MC1 does not shift to the test mode, but continues the normal main control process. For this reason,
Malfunctions can be prevented when the vehicle is running.

Next, proceeding to step 112, 0MC1 detects input signals from each sensor via input circuit 2 and serial input circuit 5. Next, it is determined whether or not the detection process in step 112 is the first time after the execution of this process (114).

If this condition is met, the process returns to step 108. On the other hand, if the condition in step 114 is not met, the process proceeds to step 116. Here, each input signal detected this time in step 112 is compared with each input signal detected in the previous process of step 112 and stored in the RAM 1c, and the input signals that have changed compared to the previous time are determined. It is determined whether there is one (116). If this condition does not apply,
Proceed to step 120. Here, the output code corresponding to the input signal that changed most recently among the input signals detected several times in step 112 is read from the table (120). Here, the table is a table that sets a one-to-one correspondence between each input signal and an output code, and is stored in advance in the ROM 1b, as shown in Table 1, for example.

Table 1 Then, the process proceeds to step 122. Meanwhile, step 116
If the condition is met, the process advances to step 118. Here, the output code corresponding to the input signal that has changed compared to the previous detection is read from the table above (118
). The process then proceeds to step 122. Here, the changed input signal changes from low level (OFF) to high level (ON).
＞ (122＞. This Article 1
1! If ① applies, proceed to step 124. 0
After setting N10FF Norag SWF, step 12
Proceed to step 8. On the other hand, if the condition of step 122 is not met, the process proceeds to step 126, and the 0N10FF flag SW
After resetting F, the process proceeds to step 128. Here, the 0N10FF change state of the changed input signal determined from the state of the 0N10FF flag SWF and the ROM1b
Output the output code read from, for example, from the output port 11 to the output circuit 10 via the serial output circuit 9,
It is displayed on the check lamp CL as the check lamp signal W, or outputted to the diagnostic display terminal DT as the diagnostic display signal VF.

Then, the process returns to step 108 again. Thereafter, the above process is repeated until the test mode signal T becomes low level (OFF>).

Next, an example of the control timing of the above process is shown in FIG. FIG. 6 is a timing chart showing changes in the test mode signal @T1 throttle full open switch signal IdQ, neutral safety switch signal NSW, air conditioner signal A/C1, and diagnostic display signal VF over time.

In the figure, the test mode signal T becomes high level (ON) at time t1, and 0MC1 shifts to the test mode. In this case, at the same time t1, the diagnostic display signal VF
The voltage changes from Vl to v2. Note that the voltage V1 has a value such as, for example, O [Vl, and the voltage (2) has a value such as, for example, 2.5 [Vl. Next, at time t2, the throttle full-open switch signal IdΩ changes from high level (ON) to low level (OFF>. Then, the voltage of the diagnostic display signal VF changes from v2 at time t2 to indicate the start of output. Note that the voltage V3 has a value such as 5.0 [Vl, for example.

Next, at time t3, the voltage changes from V3 to ■2,
Roughly at time t4, the voltage changes from V2 to Vl,
At time t5, the voltage returns from ■1 to V2 again.

Note that each time interval between times t2, t3, t4, and t5 has a value of, for example, 0.3 [5 ecl. This time t2
The change in the diagnostic display signal VF from to time t5 is as follows:
This is an output start code indicating the start of output of the output code of the changed input signal. Next, throttle full open switch signal 1
The output code 1 corresponding to dΩ is changed from high level (ON) to low level (
In order to also display that the voltage has changed to OFF>, the voltage of the diagnostic display signal VF changes from V2 to vl at time t6, and roughly returns from vl to 2 for display at time t7. Note that time t5 and time t6
The time interval is, for example, 1.5 [SeC], and the time interval between time t6 and time t7 is, for example, 1.0 [SeC].
C]. After that, since there is no change in the input signal, the diagnostic display signal VF changes from time t8 to time t1.
0, the output start code and the output code 1 which changes from high level (ON) to low level (OFF) are output, showing the same changes as described above. In the test mode, the input signal can be changed as described above, for example, by the inspector operating switches on each sensor of the vehicle.

At time t9 while output code 1 is being output, the neutral safety switch signal NSW changes from low level (OFF> to high level (ON>). Correspondingly, the diagnostic display signal VF changes from low level (OFF> to high level (ON>). Time t
The above output start code is output from time t11 to time t12. Next, the neutral safety switch signal N
In order to display the output code 2 corresponding to SW together with the fact that the neutral safety switch signal NSW has changed from low level (OFF) to high level (ON), the voltage of the diagnostic display signal @VF is changed at time t13. changes from V2 to V3, and then returns from V3 to ■2 at time t15. Then, time t16
At time t17, the voltage changes again from V2 to v3, and roughly at time t17, the voltage returns from v3 to V2 and is displayed.

Roughly speaking, time t1 while outputting the above output code 2
4, the air conditioner signal A/C is at low level (OFF
> has changed to high level (ON>. For this reason,
The diagnostic display signal VF is from time t18 to time t19.
The above output start code is output until Then, the output code 3 corresponding to the air conditioner signal A/C is changed from low level (OFF>) to high level (ON).
) from time t20 to time t2.
For the diagnostic display signal VF up to 2, the voltage is v2 and ■
3 at predetermined time intervals.

Next, time t21 while outputting the above output code 3
, the throttle full-open switch signal IdQ changes from low level (OFF> to high level (ON>). Therefore, the diagnostic display signal VF outputs the above output start code from time t23 to time t24. The output code 1 corresponding to the fully open switch signal IdΩ is changed from the low level (OFF') to the high level (ON) of the throttle fully open switch signal 1dQ, and the diagnostic display signal VF is changed from time t25 to time t26. , the voltage is changed and displayed at predetermined time intervals between V2 and V3.

Next, FIG. 7 shows another example of control timing for the above-described process. FIG. 7 is a timing chart showing changes in the test mode signal @O, the throttle fully open switch signal 1 dΩ, and the check lamp signal W over time.

In the same figure, at time t30, the test mode signal T becomes high level (ON>, and 0MC1 shifts to the test mode.Next, at time t31, the throttle close switch signal @I d Q changes from low level (OFF>) to high level. level (ON).

Then, the check lamp signal W first outputs an output start code indicating the start of output between time t31 and time t34. That is, at time t31, the check lamp signal W changes from the off state (OFF) to the on state (ON), and at time t32, the check lamp signal W changes from the on state (ON> to the off state (OFF). The same change as described above is shown from t33 to time t34.The time intervals between times t31, t32, t33, and t34 are, for example, 0.25[5ecl.This causes the output start to be displayed. Next, the output code 1 corresponding to the full throttle switch signal 1dQ and the fact that the full throttle switch signal 1dQ has changed from low level (OFF> to high level (ON)) are displayed together.

That is, at time t35, the check lamp signal W
changes from an unlit state (OFF) to a lit state (ON>).

Then, at time t37, the lighting state (ON> changes to the off state (OFF>.
The time interval 37 is a value such as i, o (secl). Here, the output time interval of the output code 1 indicates that the input signal changes from low level (OFF) to high level (ON). ing.

Next, at time 136 while the above signal is being output, the throttle fully open switch signal 1dQ is at a high level (
ON> to low level (OFF). Correspondingly, the check lamp signal W outputs the output start code from time t38 to time t39. Then output code 1 is the throttle fully open switch signal 1dΩ
At time t40, the check lamp signal W changes from the off state (OFF> to the on state (ON)), and at time t41, the check lamp signal W changes from the high level (ON) to the 01 level (OFF). The light changes from the lighting state (ON> to the light-off state (OFF).
The time interval between time t40 and time t41 is, for example, 0.5 [5
It is a value like ecl. Again, the above output code 1
The input signal becomes high level (ON) depending on the output time interval of
> to low level (OFF).

In this way, there are two states: the lighting state (ON>) and the lighting state (OFF).
When the input signal type and change state are indicated by the check lamp signal W that takes a normal state, the input signal is set to a high level ( It is possible to display whether the signal has changed from a low level (ON) to a low level (OFF) or vice versa.

Next, a roughly different example of the control timing of the above process is shown in the eighth section.
FIG. 8 is a timing chart showing changes in the test mode signal T, the throttle fully open switch signal IdQ, and the diagnostic display signal VF over time. In this example, the output code is 4 bits (bat).
Displayed as a binary number. Further, it is assumed that the voltage v4 of the diagnostic display signal VF corresponds to the binary number O, and the voltage ■6 corresponds to the binary number 1. Note that, for example, the voltage v4 is O[V], V
5 has a value such as 2.5 [V], and V6 has a value such as 5.0 [V].

In the figure, at time t50, test mode signal T
changes from low level (OFF> to high level (ON>), and 0MC1 shifts to test mode. In this case, at the same time t50, the voltage of the diagnostic display signal VF changes from v4 to ■5.

Next, at time t51, the throttle full-open switch signal IdΩ changes from a low level (OFF>) to a high level (ON
). Then, from time t51 to time t52, the diagnostic display signal VF changes from voltage v5 to voltage V6.
It changes twice at a predetermined time interval between. In this case, the change in voltage from v5 to V6 indicates that the input signal has changed from low level (OFF> to high level (ON).Next, the output corresponding to the fully open throttle switch signal is In order to output code 0001, the diagnostic display signal VF changes three times between voltages V5 and V4 at predetermined time intervals from time t53 to t55 and displays 000. Next, at time t55 from time t
During the period of 56, the voltage changes from v5 to V6, returns to V5 again, and 1 is displayed.

Next, at time t54 while the above output code is being output, the throttle fully open switch signal IdΩ changes from high level (ON) to low level (OFF). Correspondingly, the input signal of the diagnostic display signal VF changes from high level (ON> to low level (OF).
In order to display the change to F>, the time t
Between 57 and time ↑58, the output start code is output by changing the voltage twice between voltage V5 and ■4. Then, between time t59 and time t60, the output code is output as 0001 in binary as in the case described above.

As described above, in this example, the changing state of the input signal is simultaneously displayed by the difference in the changing voltage when outputting the start code, and the output code corresponding to the input signal is 4-bit ( It is displayed as a binary number (bit). In addition, each input signal name used in this example,
The corresponding output code and binary representation are shown in 1 above.
As shown in the table.

In this embodiment, the input means a is connected to the panono circuit 2, the multiplexer 3, the A/D converter 4, the serial input circuit 5 and 0MC1, the control means is connected to 0MC1, and the fault diagnosis instruction detection means C is used for the test mode. Processing (1) executed by terminal T-S and serial input circuit 5 and 0MC1
08, 110>, the determination means d performs the process executed by 0MCl (112, 116>, the diagnostic data output means e
is the process executed by the serial output circuit 9, output circuit 10, check lamp CL, diagnostic display terminal DT and 0MCl (118, 120, 122°124.
6.128) respectively.

In this embodiment, when a test mode instruction signal T is input to the test mode terminal TS, a check lamp signal W is output,
Alternatively, changes in the input signal to the internal combustion engine control device for a four-cylinder engine can be easily confirmed by outputting the diagnostic display signal VF.

Further, with the above effects, it becomes possible to easily perform a failure diagnosis of the input circuit of the internal combustion engine control device for a four-cylinder engine.

Furthermore, in this embodiment, the fault diagnosis data is checked at 0N10F of the check lamp signal W or the diagnostic display signal VF.
Since the output signal is output based on the F change, the output signal can be easily checked.

Furthermore, in this embodiment, failure diagnosis of the input/output circuit can be easily performed when assembling the internal combustion engine control device for a four-cylinder engine into a vehicle or when performing vehicle maintenance.

In general, this embodiment has the advantage that even if the input/output circuit is diagnosed for failure, it does not interfere with the vehicle running function.

Furthermore, in this embodiment, since only the signal that has changed is selected and output from among the plurality of input signals, it is easy to check the input signal that has actually changed when diagnosing a fault. It becomes possible.

In this example, for example, oxygen 8! For an input signal whose frequency changes, such as the frequency sensor signal Qx, if the frequency is above a predetermined value, it is determined to be high level (ON), and if the frequency is below the predetermined value, it is determined to be low level (OFF). Even if it is done, the effects of the present invention can still be obtained.

Further, in this embodiment, changes in various input signals are displayed using the check lamp signal W or the diagnostic display signal @VF, but for example, the throttle open/close switch signal 1dQ is used as the throttle opening signal L1, and the air conditioner signal A/C is used as the throttle opening signal L1. It may be configured such that each input signal corresponds one-to-one with each output signal, such as the throttle opening signal L2, and a change in the input signal is output as a change in the corresponding output signal.

When such a configuration is adopted, it becomes possible to simultaneously check the failure diagnosis of the input circuit and the failure diagnosis of the output circuit.

Furthermore, in this embodiment, the case of an internal combustion engine control II system for a four-cylinder engine has been explained as an example of a vehicle control system. Even when the present invention is applied to a control device, the effects of the present invention can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not equally limited to these embodiments, and it goes without saying that it can be implemented in various forms without departing from the gist of the present invention. .

[Effects of the Invention] As detailed above, according to the present invention, failure diagnosis of input circuits and output circuits can be easily performed with a vehicle control device mounted on a vehicle by using only simple measuring instruments. It is possible to do this in a short time.

Furthermore, according to the present invention, failure diagnosis of input circuits and output circuits can be performed without impairing the driving function of the vehicle.

In summary, according to the present invention, it is possible to perform failure diagnosis of input circuits and output circuits of a vehicle control device without using special dedicated equipment or without requiring advanced specialized knowledge. There is also the advantage that costs associated with factory production and inspection, on-site maintenance, etc. can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic concept of the present invention, FIG. 2 is a system block diagram showing an embodiment of the present invention, FIG. 3 is a check lamp signal output circuit diagram used in the embodiment of the present invention, and FIG. 4
The figure is a diagram of the diagnostic display signal output circuit used in the embodiment of the present invention, Figure 5 is a flowchart of the processing executed by the OMC, and Figure 6 shows changes in the input signal and the diagnostic display signal over time. A timing chart expressed according to
FIG. 7 is a timing chart showing changes in the input signal and check lamp signal over time, and FIG. 8 is a timing chart showing changes in the input signal and diagnostic display signal over time. a... Input means b... Control means C...
Failure diagnosis instruction detection means d...judgment means e...diagnosis data output means 1...one-chip microcomputer (OMC) 2
...Input circuit 3...Multiplexer 4.
...A/D converter 5...Serial input circuit 6.
7, 8.10...Output circuit 9...Serial output circuit TS...Des 1 to mode terminal CL...Check lamp DT...Diagnostic display terminal

Claims (1)

[Scope of Claims] 1. Input means for inputting detection results from one or more detectors provided in each part of the vehicle, and control means for controlling the vehicle based on each detection result input to the input means. , a fault diagnosis instruction detection means for detecting an instruction to start a fault diagnosis; and whether the input to the input means changes when the fault diagnosis start instruction is detected by the fault diagnosis instruction detection means. A vehicle control having a failure diagnosis function, comprising: a determination means for determining whether or not the input has changed; and a diagnostic data output means for outputting the type of input that has changed when the determination means has determined that the input has changed. Device. 2. A vehicle control device having a failure diagnosis function according to claim 1, wherein the diagnostic data output means is constituted by an output circuit provided exclusively for the purpose. 3. A vehicle control device having a failure diagnosis function according to claim 1, wherein the diagnostic data output means also serves as an output circuit of the control means.