JPH09193744A - Vehicle control device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent erroneous diagnosis of system abnormality caused by theft determination processing. SOLUTION: A code collation control unit 27 reads a personal identification code of a key 25 inserted in a key cylinder 26 and collates it with a predetermined personal identification code. If both personal identification codes match, it is determined as normal (theft is not present). , And outputs a start permission signal to both the engine control unit 28 and the throttle control unit 29. The throttle control unit 29 completely closes the throttle valve 13 to prohibit engine start until a start permission signal is input, and after the start permission signal is input, the throttle valve 13 is driven to open to start the engine 11. . The engine control unit 28 prohibits the storage process of the abnormality diagnosis result until a predetermined time elapses after the start permission signal is input. This is because it takes some time for the opening of the throttle valve 13 to reach the normal range from the fully closed position after the start permission signal is input (after the start prohibition is released).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle control device provided with a device for preventing vehicle theft and a device for diagnosing vehicle abnormality.

[0002]

2. Description of the Related Art In recent years, some vehicles are equipped with anti-theft devices. In this anti-theft device, for example, a key for starting an engine has a secret code, and when the key is inserted into a key cylinder, the secret code of the key is read by a reading device on the key cylinder side and stored in an in-vehicle computer. There is a device that prevents the vehicle from being stolen by checking whether it is a legitimate key by comparing it with a personal identification code. . Here, as a method of prohibiting the engine start, the starter relay is cut to prohibit the starter operation, or the injection / ignition signal is cut.

Further, in recent automobiles that have been electronically controlled, an abnormality diagnosis device (diagnosis) is mounted. This abnormality diagnosis device monitors the operating status of various in-vehicle systems during engine operation to diagnose whether there is an abnormality, and when an abnormality occurs, stores the diagnosis result in the memory in the in-vehicle computer. If the abnormality diagnosis result is read from the memory when repairing the, the details of the abnormality can be easily analyzed.

In a vehicle equipped with the above-mentioned abnormality diagnosis device and anti-theft device, engine start is prohibited until it is determined that there is no theft (normal), and the engine will not start normally even if the key is operated. The abnormal result of the abnormality diagnosing device is "abnormal", and if this is stored in the memory as it is, an erroneous abnormality diagnosis will be made.

In order to avoid this problem, paying attention to the fact that the theft decision is made immediately after the ignition switch is turned on, and for example, 500 m after the ignition switch is turned on.
During the period s, the storage process of the abnormality diagnosis is prohibited, and the storage process of the abnormality diagnosis is started after this abnormality diagnosis prohibition time has elapsed.

[0006]

However, the time until it is determined to be normal (no theft) by the theft determination process varies depending on external factors. For example, when the battery voltage is low, or a communication error occurs due to external noise or the like. When the theft determination is repeated due to the occurrence of the theft, it takes a long time until it is determined to be normal. Therefore, the theft determination may not be completed even after the preset abnormality diagnosis prohibition time has elapsed, and there is a possibility that an erroneous abnormality diagnosis result may be stored as described above. To avoid this, it is conceivable to set the abnormality diagnosis prohibition time to a long time, but in this case, the abnormality diagnosis storage processing is prohibited for a while even after the theft determination processing ends, and this occurs during this period. The abnormality cannot be stored, resulting in a result contrary to the original purpose of the abnormality diagnosis.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to prohibit the memory processing of the abnormality diagnosis during the theft determination processing and store the erroneous abnormality diagnosis result. It is an object of the present invention to provide a vehicle control device that can prevent the above-mentioned problems and can start the storage process of the abnormality diagnosis promptly after the theft determination processing is completed, without damaging the original function of the abnormality diagnosis.

[0008]

In order to achieve the above object, according to the vehicle control device of claim 1 of the present invention, the theft determination means determines whether or not the vehicle has been stolen after the ignition switch is turned on. When it is determined that there is no theft, a start permission signal is output to permit engine start. At this time, until the start permission signal is output, the engine start is prohibited by the theft prevention means to prevent the vehicle from being stolen. Furthermore,
At least until the start permission signal is output, storage of the abnormality diagnosis result by the abnormality diagnosis means is prohibited by the abnormality diagnosis prohibition means to prevent erroneous abnormality diagnosis results from being stored. Then, immediately after the abnormality diagnosis prohibition is released, the abnormality diagnosis storage process is started, and if an abnormality is detected,
Remember the anomaly.

Further, in the present invention, the abnormality diagnosis prohibiting means prohibits the abnormality diagnosis means from storing the abnormality diagnosis result until a predetermined time elapses from the time when the start permission signal is output from the theft determination means. . That is, until the start permission signal is output, the engine start is kept in a state in which the theft prevention means prohibits the engine start. Therefore, the theft determination means outputs the start permission signal and the engine start is canceled after the start prohibition state is released. It takes some time for the control state to reach the normal range. In consideration of this point, after the "predetermined time" required for the engine control state to reach the normal region after the start prohibition is released, the abnormality diagnosis storage process is started to improve the abnormality diagnosis accuracy.

Further, in claim 3, the abnormality diagnosis prohibiting means sets the predetermined time in accordance with the battery voltage.
That is, since the time until the engine control state reaches the normal region after the release of the start prohibition tends to become longer as the battery voltage becomes lower, by setting the predetermined time according to the battery voltage, the battery voltage at that time is set. Accordingly, the storage process of the abnormality diagnosis is started at the optimum timing.

Further, in the present invention, an electronic throttle system is used, and the theft prevention means fully closes the throttle valve to shut off intake air to the engine until the start permission signal is output from the theft determination means, Prohibit engine operation.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, a schematic configuration of the entire system will be described with reference to FIG. A throttle valve 13 is provided in the middle of an intake pipe 12 of the engine 11, and the opening of the throttle valve 13 is detected by a throttle opening sensor 14. The drive system of this throttle valve 13 is
An electronic throttle system using a DC motor 16 as a drive source is adopted, and the intake air that has passed through the throttle valve 13 is supplied into the cylinders of each cylinder along a path from the surge tank 15 to the intake manifold 12a. An injector 18 for injecting fuel supplied from a fuel tank 17 is attached to the intake manifold 12a of each cylinder.

The fuel in the fuel tank 17 is pumped up by the fuel pump 19, filtered by the fuel filter 20 and sent to the delivery pipe 21, and is distributed from the delivery pipe 21 to the injector 18 of each cylinder. The excess fuel in the delivery pipe 21 is returned to the return pipe 2
2 is returned to the inside of the fuel tank 17. A pressure regulator 23 is provided in the middle of the return pipe 22, and the back pressure chamber of the pressure regulator 23 is communicated with the surge tank 15 via the intake pressure introducing pipe 24, so that the back pressure chamber of the pressure regulator 23 is sucked. The atmospheric pressure is introduced and the fuel pressure in the delivery pipe 23 is adjusted so that the differential pressure from the intake pressure is constant.

On the other hand, the key 25 for starting the engine 11 is provided with a memory (not shown) for storing a predetermined secret code, and the key cylinder 26 into which the key 25 is inserted has the secret code of the key 25. A reading device (not shown) for reading the code is provided. The personal identification code read by this reading device is input to the code collation control unit 27 which is the theft determination means, and collated with the personal identification code stored in the memory (not shown) built in the code collation control unit 27. Then, it is determined whether or not the key 25 inserted in the key cylinder 26 is a legitimate key. If it is not the legitimate key, it is determined that the vehicle is stolen. Further, the code collation control unit 27, during the theft determination process, the engine control unit 28
A start prohibition signal is outputted to both the throttle control unit 29 and the throttle control unit 29 to prohibit the engine 11 from being started, and when the result of the theft determination is a secret code match, that is, when it is determined that there is no theft (normal), the both control units 28. , 29 to output the start permission signal immediately to permit the start of the engine 11.

The engine control unit 28 is mainly composed of a microcomputer, and calculates the fuel injection amount, the ignition timing, etc. based on the output information of various sensors for detecting the engine operating state such as the engine speed and the intake air amount. The injection pulse width of the injector 18 and the ignition timing of the spark plug 30 are controlled based on the calculation result.

On the other hand, the throttle control unit 29 controls the DC motor 16 that drives the throttle valve 13, and as shown in FIGS.
And a motor drive circuit 33. The controller 32 reads the output signal of the accelerator sensor 34 and the output signal of the throttle opening sensor 14 for detecting the accelerator opening (depression amount of the accelerator pedal) through the A / D converter 35, and calculates the target throttle opening. Then, the calculated value is output to the motor drive circuit 33 to control the rotation amount of the DC motor 16. The rotary shaft of the DC motor 16 and the throttle valve 13 are connected by a valve opening / closing mechanism 36, and the throttle valve 13 is rotated by the rotation of the DC motor 16.
Is adjusted. The throttle valve 13 is biased in the closing direction by a return spring 37.

In this embodiment, the controller 32 of the throttle control unit 29 sends the motor drive circuit 33 to the motor drive circuit 33 when the start prohibition signal is input from the code matching control unit 27 (that is, when the start permission signal is not input). A fully closed signal is output, the throttle valve 13 is fully closed as shown in FIG. 3, the intake air to the engine 11 is cut off, and engine start is prohibited (this function is the antitheft means in the claims). Equivalent to). Throttle opening sensor 1 at this time
The output value of 4 becomes 0V (see FIG. 4). Further, in the present embodiment, as the second means for prohibiting the start, the engine control unit 28 executes the injection / ignition cut to take a double start prohibition measure.

Further, when the start permission signal is input from the code matching control unit 27, the controller 32 of the throttle control unit 29 calculates the target throttle opening amount based on the output signals of the accelerator sensor 34 and the throttle opening sensor 14. Then, the calculated value is output to the motor drive circuit 33, the rotation amount of the DC motor 16 is controlled, and the opening of the throttle valve 13 is adjusted to the target throttle opening (FIG. 2 shows a normal throttle opening control state). Indicates). The output value of the throttle opening sensor 14 at this time becomes a value in the range from the lower limit value VTL to the upper limit value VTH shown in FIG. 4, and 0.0 to VTL, VTH to 5.0 (V The area of () is an area where the throttle opening sensor 14 is detected as abnormal.

The engine control unit 28 also functions as an abnormality diagnosing means for reading the outputs of various sensors for detecting the operating conditions of various in-vehicle systems, monitoring the output values of them and diagnosing whether or not there is an abnormality. Further, the engine control unit 28
It also functions as an abnormality diagnosis prohibition means for prohibiting the storage of the abnormality diagnosis result until a later-described predetermined time K elapses from the time when the start permission signal is input from the code matching control unit 27.
The engine control unit 28 is provided with a backup RAM (not shown) backed up by a battery (not shown), and the backup RAM stores an abnormality code as an abnormality diagnosis result.

Next, with reference to the time chart shown in FIG. 5, a description will be given of the operating condition of each part from the turning on of the ignition switch (not shown) to the completion of engine start. When the ignition switch is turned on, the engine control unit 2
8 and the throttle control unit 29 start control, but until the code matching control unit 27 outputs the start permission signal "1", the throttle valve 13 is kept in a fully closed state, and intake air to the engine 11 is not supplied. It is shut off and engine start is prohibited. During this engine start prohibition period, the engine control unit 2
The injection / ignition cut is executed by 8 and a double start prohibition measure is taken.

During the engine start prohibition period, the code collation control unit 27 causes the key 2 inserted in the key cylinder 26 to operate.
The security code of No. 5 is read and collated with the security code stored in the memory (not shown) to determine the presence or absence of theft. If the two personal identification codes match, it is determined to be normal (no theft), and the start permission signal “1” is output to the engine control unit 2.
8 and the throttle control unit 29. here,
Start permission signal "1" from turning on the ignition switch
The time T1 until the output of T varies depending on external factors (battery voltage, etc.) and internal factors (checking method, etc.), and is not constant.

When the code collation control unit 27 outputs the start permission signal "1", the start inhibition state is released, and the controller 32 of the throttle control unit 29 outputs the target throttle opening signal to the motor drive circuit 33. Is
The DC motor 16 is activated to open the throttle valve 13 from the fully closed position to the target throttle opening. Here, the time T2 from the output of the start permission signal "1" to the start of movement of the throttle valve 13 is calculated by the controller 32, the data communication time, the DC motor 16
Is the total of the response delay times of.

Further, even if the throttle valve 13 actually starts to move, the opening degree of the throttle valve 13 reaches the normal range from the fully closed position (that is, the output value of the throttle opening sensor 14 is in the range of VTL to VTH in FIG. 4). It will take some time. If the abnormality diagnosis result is stored before the opening of the throttle valve 13 reaches the normal range, the abnormality of the throttle opening sensor 14 will be erroneously diagnosed. To avoid this, until the predetermined time K (= T2 + α) elapses after the start permission signal "1" is output, the abnormal memory permission flag XIMOOK is maintained at "0" indicating prohibition and the abnormality diagnosis result is obtained. Is prohibited and erroneous diagnosis of abnormality of the throttle opening sensor 14 is prevented. Here, α in FIG. 5 is the time required for the opening of the throttle valve 13 to reach the normal range (that is, the output value of the throttle opening sensor 14 is in the range from VTL to VTH in FIG. 4) and some margin time. And is added. The predetermined time K (= T2 + α) is a delay time for avoiding erroneous diagnosis, which is preset by the theft determination system.

The processing described above is executed according to the routines shown in FIGS. The abnormal storage permission flag setting routine shown in FIG. 6 is executed by the engine control unit 28 as follows each time the base routine of the engine control program is executed. First, in step 101, it is determined whether or not the start permission signal “1” is received from the code collation control unit 27, and if not received, the process proceeds to step 102 and the counter CDIMO is cleared to “0”. Here, the counter CDIMO is an auto-increment counter that is incremented at regular intervals (for example, every 8 ms),
The upper limit is guarded by $ FF. Until the engine control unit 28 receives the start permission signal “1”, step 102
Then, after the counter CDIMO is cleared to "0" and the start permission signal "1" is received, the elapsed time is counted by the counter CDIMO.

Then, in the next step 103, the battery voltage is read, and in the following step 104, the predetermined time K is set according to the battery voltage. This is because the throttle valve 1 is activated after the start permission signal is received (that is, after the start prohibition is released).
The time taken for the opening of No. 3 from the fully closed position to reach the normal range (the output value of the throttle opening sensor 14 is in the range of VTL to VTH in FIG. 4) tends to become longer as the battery voltage becomes lower, so By setting the time K according to the battery voltage, the storage process of the abnormality diagnosis can be started at the optimum timing according to the battery voltage at that time.

Thereafter, at step 105, the count value of the counter CDIMO that counts the elapsed time after the start permission signal is received is checked to determine whether or not the predetermined time K has passed since the start permission signal was received, and the predetermined time If K has not elapsed, it is determined to be "No" in step 105, the process proceeds to step 106, and the abnormal memory permission flag XIMOOK is maintained at "0" indicating prohibition. After that, when the predetermined time K has elapsed from the reception of the start permission signal, in step 105, “Yes
s ”, the process proceeds to step 107, and the abnormal memory permission flag XIMOOK is set to“ 1 ”indicating permission.

On the other hand, in the abnormality diagnosis routine shown in FIG. 7, after the ignition switch is turned on, a fixed time interval (for example, 6
Every 5 ms). Although not shown in detail, this abnormality diagnosis routine reads the outputs of various sensors that detect the operating states of various in-vehicle systems and monitors the output values thereof to diagnose an abnormality. For example, in the electronic throttle system, it is monitored whether the output value of the throttle opening sensor 14 is within the normal range from the lower limit value VTL to the upper limit value VTH shown in FIG. , Diagnose as abnormal.

Thereafter, in step 121 of FIG. 7, it is determined whether or not the abnormal memory permission flag XIMOOK is "1" indicating permission, and if "0" indicating prohibition, the abnormality is the abnormality diagnosis result. This routine ends without storing the code. This prevents erroneous abnormality diagnosis codes from being stored. On the other hand, the abnormal storage permission flag XI
If MOOK is "1" indicating permission, step 122
Go to, store the error code in the backup RAM,
This routine ends.

In the embodiment described above, the abnormality diagnosis result is stored from the time when the start permission signal "1" is output from the code collation control unit 27 until the preset minimum required time K elapses. Since it is prohibited, it is possible to prevent the erroneous abnormality diagnosis result from being stored, and it is possible to quickly start the abnormality diagnosis storage processing after the theft determination processing is completed, without impairing the original function of the abnormality diagnosis.

In the above embodiment, the storage of the abnormal code is prohibited when the abnormal storage permission flag XIMOOK = 0, but the abnormal storage permission flag XIMOOK = 0.
It is also possible to prohibit the abnormality diagnosis processing itself at the time, and start the abnormality diagnosis processing when the abnormality storage permission flag XIMOOK = 1 and store the abnormality code when the abnormality is detected.

Further, in the above embodiment, when the abnormal memory permission flag XIMOOK = 0, as a measure for prohibiting the engine start, the throttle valve 13 is fully closed and the injection / ignition cut is performed at the same time, and a double start prohibition measure is performed. However, even if only one of them is used to prohibit the start, or if the start is prohibited by other means such as cutting the starter relay to prohibit the starter operation. good.

Further, in the above embodiment, the predetermined time K is set according to the battery voltage so that the storage process of the abnormality diagnosis can be started at the optimum timing according to the battery voltage at that time. However, the predetermined time K may always be a fixed time, and even in this case, the intended object of the present invention can be achieved.

Further, in the above embodiment, from the time when the start permission signal "1" is output from the code collation control unit 27,
The predetermined time K is set in consideration of the fact that it takes some time for the opening of the throttle valve 13 to reach the normal range (that is, the output value of the throttle opening sensor 14 is in the range of VTL to VTH in FIG. 4). When applying the present invention to a system having a different engine start inhibition method or control system, in a system in which the engine control state immediately reaches the normal range immediately after the start permission signal is output, it is not necessary to provide the predetermined time K, and the start permission signal is output. The storage process of the abnormality diagnosis may be started immediately later.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an entire system showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a state of an electronic throttle system in a normal state.

FIG. 3 is a schematic configuration diagram showing a state of the electronic throttle system in a start prohibited state.

[Fig. 4] Output characteristic diagram of the throttle opening sensor

FIG. 5 is a time chart for explaining the operation status of each part from turning on of the ignition switch to completion of engine start.

FIG. 6 is a flowchart showing a processing flow of an abnormal memory permission flag setting routine.

FIG. 7 is a flowchart showing a part of the processing flow of an abnormality diagnosis routine.

[Explanation of symbols]

11 ... Engine, 13 ... Throttle valve, 14 ... Throttle opening sensor, 16 ... DC motor, 25 ... Key, 2
6 ... Key cylinder, 27 ... Code collation control section (theft determination means), 28 ... Engine control section (abnormality diagnosis means, abnormality diagnosis prohibition means), 29 ... Throttle control section (theft prevention means), 32 ... Controller, 33 ... Motor drive circuit, 3
4 ... Accelerator sensor.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G08B 13/00 0234-2E G08B 13/00 B

Claims (4)

[Claims] 1. An abnormality diagnosing means for diagnosing an abnormality of an in-vehicle system, a theft judging means for judging whether or not a vehicle is stolen, and outputting a start permission signal when it is judged that there is no theft, and a start from the theft judging means. A theft prevention means for prohibiting the engine start until the permission signal is output, and an abnormality diagnosis prohibition means for prohibiting the storage of the abnormality diagnosis result by the abnormality diagnosis means at least until the start permission signal is output from the theft determination means. A vehicle control device comprising: 2. The abnormality diagnosis prohibiting means prohibits storage of the abnormality diagnosis result by the abnormality diagnosing means until a predetermined time elapses from the time when the start permission signal is output from the theft determination means. The vehicle control device according to claim 1. 3. The vehicle control device according to claim 1, wherein the abnormality diagnosis prohibiting unit sets the predetermined time period according to a battery voltage. 4. The theft prevention means shuts off intake air to the engine by fully closing the throttle valve until a start permission signal is output from the theft determination means. The vehicle control device described in (1).