JPS6132175B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a vehicle abnormality display device that detects and displays an abnormality in a control device provided in a vehicle. In conventional vehicles, the OK monitor is used to detect insufficient oil level, insufficient window wash fluid, head lamp disconnection, tail lamp disconnection, stop lamp disconnection, etc.
There are devices that detect charging system abnormalities and display warnings.
These inspection items were selected from items that were relatively easy to inspect and repair even for ordinary drivers, and the warning device was originally intended for ordinary drivers. However, the latest vehicles have become increasingly electronic and complex, making it difficult to find the location of the failure. For example, recently, one or more control devices using microcomputers, such as a fuel injection control device, ignition control device, air conditioner control device, automatic operation speed control device, etc., are mounted on a single vehicle. Each of these control devices has a plurality of sensors and actuators, and takes advantage of the characteristics of a microcomputer to precisely control the device according to a control program stored in a storage section built into each control device. Even if an abnormality occurs in the control process of a complex control device equipped with many sensors and actuators,
Recognizing the abnormality is difficult when the degree of the abnormality is low, and various conditions or combinations of these can be considered as the cause, but discovering the true cause is difficult when the control device is removed from the outside. As far as diagnosis is concerned, the more complex the operating logic of the control program, the easier it becomes. Further, even if an abnormality occurs intermittently, it is not easy for a repair shop to discover and confirm the cause of the abnormality. The present invention has been made in view of the above-mentioned problems, and is designed to enable vehicle operators to easily recognize abnormalities in the plurality of control devices described above when necessary, and to recognize the latest abnormality occurrence details. The purpose is to Therefore, in order to achieve this object, the present invention provides a vehicle equipped with a plurality of control devices that independently control various control target parts of the vehicle according to a predetermined control program, wherein the plurality of control devices include: In the control process of the control target part, each control device has a function of detecting a control abnormality of the control device itself using a part of the diagnostic program in the control program and generating an abnormal signal, and detects abnormality from the plurality of control devices. A central control device that centrally manages the presence or absence of a signal for each control device and stores abnormality data for each control device regarding the occurrence of an abnormal signal, and a central control device that receives instructions from the outside to display the details of the abnormality. an instruction generating means for generating an instruction; a display device for displaying the content of an abnormality based on abnormal data stored in the central control device when an instruction is issued from the instruction generating means; A technical means is adopted that includes: a reset means for resetting abnormal data stored in a management device; The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is an overall configuration diagram showing one embodiment. In this Figure 1, 1 is a switch group, 1a
1b is a first diagnosis switch that issues a command to the central management device 6 to select and display the first diagnosis information, giving priority to other display contents to be displayed on the display device 7; 1b is the central management device 6; This is a second diagnosis switch that issues a command to selectively display the second diagnosis information with priority over other display contents to be displayed on the display device 7. The first and second diagnosis switches 1a and 1b constitute instruction generation means. The contents of the first and second diagnosis information will be described later, but the second diagnosis switch is a hidden switch in normal vehicles.
It is designed so that it cannot be easily operated by the driver, and is normally only used for repairs or inspections by transporting it to a place that has equipment for the purpose of service or repair, such as a dealer. It is something. 1c is an initialization switch (IS switch) serving as a reset means, which issues a command to the central management device 6 to initialize the diagnosis information stored in the non-volatile RAM 6c, which is a main component of the central management device 6. It is something that emanates. 2 is a group of detectors, including a cooling water level warning switch 2a, a window washer fluid level warning switch 2b, a head lamp disconnection detection circuit 2c, a rear lamp disconnection detection circuit 2d, a stop lamp disconnection detection circuit 2e, a steering unlock switch 2f, and a door. They are installed in each part of the vehicle, such as an open switch 2g, an ignition close switch 2h, a lighting switch 2i, a battery voltage divider circuit 2j, a vehicle interior temperature sensor (thermistor, etc.) 2k, and monitor the condition of the installed parts. It converts those states into analog or digital electrical signals in accordance with changes and provides the information to the central control device 6. Reference numeral 4 designates a group of in-vehicle control devices, including a comprehensive engine control device 4a, a vehicle speed control device (including a vehicle speed warning control device) 4b, an anti-skid control device 4c, an air conditioner control device 4d, and the like. These control devices are connected to actuator groups and detector groups (not shown) necessary for accomplishing the purpose of each control device.
Various information is collected from these detector groups, and the information is processed by a microcomputer (not shown), which is the main component of the control device, and the actuator group is controlled based on the results. In addition, each control device 4a, 4b, 4c, 4d receives diagnosis information and operating state information for each control device 4a, 4b, 4c, 4d generated during the control process by a part of the diagnostic program in the control program. The information is transmitted in series according to a certain communication procedure via the data communication line 5 between the central management device 6 and each control device 4a, 4b, 4c, and 4d at an appropriate timing. The information is sent to the central management device 6. For example, the engine integrated control device 4a includes a water temperature sensor (thermistor), an intake air temperature sensor (thermistor), an intake air amount sensor (potentiometer), a battery voltage sensor, an acceleration sensor, an oxygen sensor (not shown),
A group of detectors that detect the operating status of the engine, such as an engine crank angle sensor, a vehicle speed sensor, an idle switch, a full throttle switch, an air conditioner operating switch, a starter operating switch, and a neutral position switch, are connected. A microcomputer (not shown), which is the main component of the control device, processes that information to purify exhaust gas, improve drivability,
In order to optimize the fuel supply to the engine for the purpose of improving fuel efficiency, increasing output, etc., the conduction time and start of conduction of the drive coil of the injector, which is an actuator (not shown) that injects fuel into the intake system of the engine (not shown). For the same purpose, information from various sensors is processed to control the ignition timing of an ignition device (not shown) and to control the ignition ability of the ignition device to a certain level over the entire rotation range. Based on the results, the timing for starting conduction and the timing for cutting off conduction of an ignition coil (not shown) in the ignition device are controlled. Further, in order to stabilize the engine speed at a constant value when the engine is idling, the opening and closing of the intake valve is controlled by a step motor (not shown) which is an actuator for feedback controlling the amount of intake air according to the engine speed.
In addition, this is done by controlling the duty of the conduction time of the drive coil of a negative pressure switching valve (not shown), mixing the engine intake negative pressure and atmospheric pressure at a duty ratio, creating an appropriate negative pressure, and applying the negative pressure to the created negative pressure. Therefore, the amount of intake air may be adjusted by an air switching valve (not shown) that controls the amount of intake air. In the process of control, this engine comprehensive control device diagnoses the operating states of various detectors and actuators connected to the engine control device, as well as the operating state of the control device's own circuits, and determines whether they are normal or abnormal. data is retained. Also, based on the information from the detector, data on operating conditions such as engine rotation speed are held, and at an appropriate timing, data is sent to the central control device 6 in series via the data communication line 5 according to a predetermined communication procedure. Send those data accordingly. 5 is a central control device 6 and other in-vehicle control devices 4
A group of data communication lines that connect Reference numeral 6 denotes a central control device, which includes a one-chip microcomputer 6a consisting of a CPU, ROM, RAM, I/O circuit, etc., and an A/D.
Converter 6b and CMOS non-volatile RAM 6
c as the main component, a microcomputer 6a
central control device 6 of switch group 1 from the input port of
inputs control command information to the detector group 2, inputs information on the status of each part of the vehicle in which the detector is installed from the detector group 2, and receives serial data communication from the other on-vehicle control device group 4. , the microcomputer 6a processes the information to create various display information, stores it in RAM, selects data to be displayed from among the stored various display information, and displays it for display. Control device 7. In addition, RAM
Necessary display information stored in the display information is stored in the non-volatile RAM 6c, which retains its memory even when the power is turned off. The storage contents of this nonvolatile RAM 6c are as shown in Table 1, and the A area of this nonvolatile RAM 6c mainly contains diagnosis abnormality information sent from each control device 4a, 4b, 4c, and 4d, and central management. Diagnosis abnormality information of the device 6 itself is stored, and area B stores OK monitor information, switch information, operation information of each control device 4a, 4b, 4c, 4d, battery voltage, room temperature, etc., and information that occurs during arithmetic processing. Temporary data is stored.

[Table] Note that the contents stored in area B may be erased by turning off the ignition switch. Further, the A/D converter 6b inputs the analog voltage generated from the battery voltage divider circuit 2j and the room temperature detection circuit (using a thermistor) 2k in the detector group 2, converts it into A/D, and converts it. The subsequent digital information is provided to the microcomputer 6a in response to a request from the microcomputer 6a. Reference numeral 7 denotes a display device that displays characters and numbers corresponding to display commands from the central control device 6 using a display 7a and a lamp (warning light) 7b. Electroluminescent display (EL), liquid crystal display (LC), gas discharge tube display (GC), fluorescent display, light emitting diode display (LED), etc. can be used. Moreover, an LED, a white light bulb, a gas discharge tube, etc. can be used as the lamp. A buzzer 8 is turned on and off in response to a buzzer electromotive signal from the central control device 6 (the output stage of the central control device 6 is equipped with a buzzer drive transistor) to issue a warning to the driver. 9 is a power supply section of the central control device 6, and a battery 10
Generates a constant voltage by receiving DC power from the
Reference numerals 9a and 9b are constant voltage circuits of the central control device 6, which generate a constant voltage (both constant voltages of 5V) from an on-vehicle battery 10 and supply it to the central control device 6. The first constant voltage circuit 9a is directly connected to the battery 10,
A non-volatile device in the central control device 6 that constantly maintains a constant voltage.
The non-volatile RAM 6c is always energized, and the memory is retained even when the ignition switch 9c is turned off. Further, when the ignition switch 9c is turned on, the second constant voltage circuit 9b receives power from the ignition switch 9 from the battery 10.
c. Power is supplied via the diode 9f, and a constant voltage is supplied to other parts of the central control device 6 except for the nonvolatile RAM 6c. Also, even if the ignition switch 9c is off, if the door switch 9d (the switch turns on when the driver's door opens) is on,
The PNP transistor 9e becomes conductive, and the second constant voltage circuit 9b comes into operation with power supplied from the battery 10 via the PNP transistor 9e and the diode 9g. Next, in the above configuration, the operation is shown in the display explanatory diagram shown in FIG. 2, the calculation flow chart in FIGS. 3 to 10, the timing chart shown in FIGS. 12 to 14,
This will be explained with reference to serial data configuration diagrams shown in FIGS. 11 and 15. Now, in a vehicle equipped with components 1 to 10 in FIG.
A constant voltage is supplied through the constant voltage circuit 9b, and each part of the electrical system is brought into operation. The microcomputer 6a then receives the stabilizing voltage from the second constant voltage circuit 9b and enters the operating state.
Arithmetic processing of the control program is executed at a cycle of approximately 100 msec. That is, the arithmetic processing is started from the start step 100 in FIG. 3, and the process proceeds to the initial setting routine 200 where the registers and
Set the counters, latches, and some storage in RAM to the initial state necessary to begin the operation. The OK setting operation in this initial state will be explained later.
Resetting the monitor flags of each monitor item, initializing the serial data reception routine, and each control device 4
This includes work such as initializing the operation data of a, 4b, 4c, and 4d. However, at this time, only the diagnosis information of each control device 4a, 4b, 4c, and 4d that has been stored up to that point is not affected by this initial setting operation. In addition, the check code data in the check code area in the non-volatile RAM 6c (non-volatile RAM
If constant voltage power has been continuously supplied to 6c since the last time the ignition switch 9c was turned on, the non-volatile RAM written in the non-volatile RAM 6c immediately before the previous ignition switch 9c was turned off.
6c) and non-volatile RAM
By checking other data in 6c at the same time, if the reference result is different from the predicted value, the ignition switch 9c is turned on for the first time after constant voltage power is supplied to the nonvolatile RAM 6c, and the central control device It is determined that constant voltage power is supplied to the entire nonvolatile RAM 6c, and all data in the nonvolatile RAM 6c is determined to be invalid and initialized. After this initial setting, the routine advances to an information search (switch group, detector group) routine 300. This information search routine 300 sets/resets the first and second diagnosis switch flags and IS switch flags in response to the on/off states of the first and second diagnosis switches 1a, 1b, and IS switch 1c. do. It also detects the on/off states of the cooling water level warning switch 2a and window washer fluid level warning switch 2b in the detector group 2 to determine whether or not the cooling water and window washer fluid are insufficient. Judgment: insufficient cooling water,
Reset the window washer fluid shortage flag/
Set. Also, headlamp disconnection detection circuit 2
c. High/low output voltages of the rear lamp disconnection detection circuit 2d and stop lamp disconnection detection circuit 2e are detected to determine disconnection/continuity of the head lamp, rear lamp, and stop lamp, and each lamp disconnection flag is set/reset. Also, by detecting the on/off states of the ignition close switch 2h, lighting switch 2i, and door open switch 2g, the ignition close switch 2h is turned off (open), the lighting switch 2i is turned on, and the door open switch 2g is turned on. It is determined that the three on (open) states have been established, and a flag indicating ``forgot to turn off the light'' is set for a certain period of time after the conditions are established. Also, turn on/off the ignition close switch 2h, steering unlock switch 2f, and door open switch 2g.
It detects the off state and determines that the ignition close switch 2h is off, the steering unlock switch 2f is on (with the key inserted), and the door open switch 2g is on. After this is established, a ``KEY forgotten'' flag is set for a certain period of time. Further, data on the battery voltage and room temperature are determined based on the output voltages of the battery voltage voltage dividing circuit 2j and the room temperature detection circuit 2k and the digital signals sent through the A/D converter 6b, and these data are stored in the RAM. After performing the above arithmetic processing, the process proceeds to the communication information processing routine 400. This communication information processing routine 400 decodes the data received from each control device group 4 in the timer interrupt routine shown in FIG.
Diagnosis information and operating state information of the controllers 4a, 4b, 4c, and 4d are obtained, and data processing for displaying the operation and diagnosis of each control device 4a, 4b, 4c, and 4d is performed based on the information.
(The detailed calculation process is shown in FIG. 6.) The received data used in this communication information processing routine 400 will be explained below. Now, while the series of routines shown in Fig. 3 are being executed, the timer interrupt routine shown in Fig. 4, which is executed with priority over other routines due to timer interrupts that occur at a predetermined cycle of 1 msec. When the serial data reception routine 800 is reached, the data communication line group 5
Each control device 4a, 4 is transmitted from the control device group 4 via a predetermined communication procedure.
Diagnosis information and operation information data of b, 4c, and 4d are sampled at appropriate timings synchronized with timer interrupts, and after performing arithmetic processing such as parity error check to confirm the validity of the data, it is determined that the data is valid. When it is determined, the data is stored for each communication line in the nonvolatile RAM 6c, and at the same time, the unprocessed data flag for that communication line is set. The configuration of this serial data is
Shown in Figure 1. Next, the operation of this serial data reception routine 800 will be explained with reference to the serial data reception timing chart shown in FIG. In FIG. 12, 1 indicates the timing at which a timer interrupt occurs. 2 and 6 indicate serial data on two data communication lines (hereinafter referred to as first and second data communication lines) of the data communication line group 5. 3,7
indicates the data sampling timing of the first and second data communication lines. 4 and 8 indicate the timing of resetting/setting the data receiving flag indicating that serial data on the first and second data communication lines is being received. Reference numerals 5 and 9 indicate unprocessed data presence flags corresponding to the first and second data communication lines, indicating that the data received from each communication line has not yet been processed by the communication information processing routine 400 in the main routine. Indicates when to set. The transmission rate of this serial data is 250 bits/second, and as shown in Figure 11, the start bit (ST) is low level, 1 bit data is positive logic, 8 bits, and the parity (P) is an even number. The parity is 1 bit, and the stop bit (ST) is 1 bit at high level. It is at a high level when there is no data. Next, this serial data reception routine 800
The operation will be explained with reference to the timing chart shown in FIG. 12 and detailed calculation processing shown in FIG. The arithmetic processing shown in FIG. 5 is for one piece of serially received data, and similar arithmetic processing is sequentially executed for other serially received data. First in the timing chart shown above,
Data on the second data communication line (Fig. 12 2,
6) is the timer interrupt generation timing (Figure 12 1)
The data sampling timing (first
2) is sampled in Figures 3 and 7). Period 801
a, 801b is a start bit detection period, during which the data communication line is in a state of no data after one data communication is completed, and each data communication line is detected every time a timer interrupt occurs (every 1 msec). data is sampled. This period is a period in which the data communication line goes to a high level state after the previous data communication ends, and then finds the timing at which it changes to a low level for the first time. Subsequently, during periods 802a and 802b, each data communication line is activated in synchronization with the second timer interrupt timing (after 2 msec) after a change in the level of each data communication line from high to low is detected during the start bit confirmation period. The data is sampled, and if it is at the same low level at this time, it is determined that there is a true start bit (ST). or,
If the sampled value is a high level, it is determined that the previously sampled low level was noise, and the process returns to the states 802a and 802b again. Then, following periods 802a and 802b, in serial data reception periods 803a and 803b, the fourth time (4 msec) after the previous data sampling
Data on the first and second data communication lines is sampled by the number of bits of communication data (8 data bits + 1 parity bit + 1 stop bit = 10 bits) at each timer interrupt generation timing. The relationship between the 8 bits of data and the parity bit in the 10-bit data thus obtained is checked (parity check), and the stop bit level (high level) is checked, and if it is determined that reception has been completed normally, the data is 8 bits RAM
At the same time, the unprocessed data presence flag corresponding to each data communication line is set at the timings shown in FIGS. 5 and 9. As shown in Figures 4 and 8 in Figure 12, the data receiving flag is set from the time the start bit is confirmed until the first timer interrupt occurs after the stop bit is sampled, and during this time, data is unconditionally transmitted. The data is sampled every fourth timer interrupt and is handled as communication data. Based on the above-described received data and the unprocessed data flag, the communication information processing routine 400 first enters step 401 for determining the unprocessed data flag shown in FIG. Here, the set/reset state of the unprocessed data flag for each communication line is determined, and if the unprocessed data flag is set and the determination is YES, the next diagnosis information and operation information are determined. Proceed to step 402.
In this judgment step 402, information on each communication line or even information on the same communication line is classified into diagnosis and operation status information according to predetermined classifications depending on the data format. The process advances to an information decoding and storing routine 403, and if it is operational information, the process advances to an operational information decoding and storing routine 407. If the process proceeds to routine 407, the received data is decoded and stored in the RAM as information such as the engine rotational speed, the autodrive operating state, the speed winner operating state, etc., and then the process proceeds to the next step 408. Furthermore, when proceeding to routine 403, the received data is decoded as diagnosis abnormality information, classified by each control device and by item, and as shown in Tables 2 and 3, the diagnosis information storage area in the non-volatile RAM 6c is (Tables 2 and 3 show the 1st and 2nd groups of diagnosis abnormalities. The 1st group is from address ADR ₁ to ADR _1+o , and the 2nd group is from address ADR ₂ to ADR _2+o .) Diagnosis error flag group in Group 1 and Group 2 for each diagnosis error item (1/1 in the table)
Set the corresponding diagnosis error flags in the 0 part) (set the 1/0 part to 1)
do. Then, the corresponding diagnosis counters are set to 0. This diagnosis counter is set at a fixed cycle synchronized with the timer interrupt (1 second for group 1, 1 hour for group 2) in routine 1000 for accumulating the elapsed time after diagnosis abnormality reception in the timer interrupt routine shown in FIG. ), the contents of the diagnosis counter whose diagnosis error flag is set to 1 are read into the microcomputer 6a, incremented by 1 in the microcomputer 6a, and the value is returned to the counter at the address where it was previously stored. will be written to. That is, the counter of the first group or the second group whose diagnosis abnormality flag is set to 1 is incremented by 1 every second for the first group and every hour for the second group. Therefore, these two types of diagnosis counters indicate the elapsed time since the corresponding diagnosis abnormality item was last received, one in units of one second and one in units of one hour. Note that (1), (2), (3), and (4) in Tables 2 and 3 are, for example, the No. 1 item of the engine ECU, the No. 2 item of the engine ECU, and the No. 1 item of the air conditioner ECU. Each item corresponds to the No.j item of the auto drive ECU.

【table】

[Table] When this routine 403 ends, the process proceeds to an importance classification routine 404. In this routine 404, the diagnosis received data processed in the routine 403 is classified into two stages, A/B, according to the predetermined importance for each diagnosis abnormality item, and the next A/B judgment step 4 is performed.
If the flag is classified as A, the flow advances to flag A set routine 406. And this routine 406
The flag A is set at step 408, and the routine proceeds to routine 408. Also, in the A/B determination step 405, B
If it is classified, the process directly advances to routine 408. This unprocessed data flag reset routine 408
is a routine for resetting the unprocessed data presence flag corresponding to the received data processed in routines 403 and 407. After passing through this routine 408, a step 40 for determining the elapsed time after diagnosis reception is performed.
Proceed to 9. Further, if the determination at the first unprocessed data presence flag determination step 401 is NO, the process directly advances to this determination step 409. In this judgment step 409, the elapsed time for each item of the first group of diagnosis abnormalities in Table 2 is judged based on the value of the timer counter accumulated in the routine 1000 of FIG. If the elapsed time is longer than T1 (for example, 15 seconds), the process proceeds to flag reset routine 410, and if the elapsed time is less than T1, the process directly proceeds to routine 400a in FIG. 3. Then, if the flag reset routine 410 is proceeded to, a determination step 409 is performed.
All diagnostic abnormality flags in the group for which it is determined that T1 or more have elapsed are reset.
Then, in the next determination step 411, it is determined whether all the diagnosis abnormality flags of classification A in one group have been reset, and if they have all been reset, the process advances to routine 412,
The flag A set in step 06 is reset, and if even one flag is still set, the process directly advances to the next determination step 413. This judgment step 413
Then, the elapsed time after receiving the diagnosis corresponding to the flag set in the second group is determined by the value of the timer counter accumulated in routine 1000 in FIG. 2nd group flag reset routine 41
4, and if it is within T2, the process directly proceeds to routine 400a in FIG. Further, when the routine proceeds to routine 414, all flags in the second group for which it is determined in determination step 413 that T2 or more has elapsed are reset, and the counting operation of the corresponding counter is disabled. Then, the process advances to the next routine 400a. In a self-diagnosis processing routine 400a shown in FIG. 3, a self-diagnosis of the central management device 6 is performed in accordance with a predetermined determination standard. That is, the microcomputer 6a of the central control device 6 checks the level of the input signal line to the central control device 6 under certain conditions and the presence or absence of a signal within a certain period of time, and if it is out of specification, the input signal is checked. It is determined that there is an abnormality somewhere in the signal input system, and the diagnosis abnormality information is stored in the non-volatile RAM 6c and sent to other control devices 4.
It is stored in the same way as the diagnosis abnormality information sent from a, 4b, 4c, and 4d. In addition to this self-diagnosis, it is also possible to perform diagnosis by monitoring the output signal with a separate circuit, checking the program ROM depending on the microcomputer, and checking the RAM when the power is turned on. Following this routine 400, determination step 5
Go to 00. In this determination step 500, the routine 300
The IS switch 1c information input in is judged by the IS switch flag, and if the IS switch flag is set, the diagnosis information initial setting routine 1 is executed.
100 and returns to the initial setting routine 200.
If it is a reset, the next display item selection routine 60
Go to 0. When the routine proceeds to routine 1100, all of the first and second groups of abnormality flags in the diagnosis abnormality information are reset, and flag A is also reset. Further, when proceeding to the display item selection routine 600, based on the information input in the routine 300 and the routine 400, items to be displayed on the display device 7 are selected according to a predetermined display priority order,
The contents of the selected item are set in a display command register that stores commands for the display device 7.
This display command includes a command to turn on a warning light and a command to turn on a buzzer, and these commands to turn on a warning light and a command to turn on a buzzer can be performed in parallel with a command to display a selected display item. This display item selection routine 600 will be explained with reference to the detailed flowchart of FIG. When entering this display item selection routine 600, the process first proceeds to step 601 in which the value of flag A is determined.
If the flag A set/reset in routines 406 and 412 is checked, and it is set, it is determined that a diagnostic abnormality of high importance is currently occurring in some control device, and the warning light lighting command routine 602 is executed. A warning light display command for lighting up a warning light to urge the driver to promptly repair the vehicle is set in the display command register. Also, if flag A is checked and reset, it is determined that no diagnostic abnormality of high importance is occurring in any of the vehicle's systems at this time, and the process proceeds to the warning light extinguishing routine 603, where the warning light is extinguished. Set the command to the display command register. The process then proceeds to a determination step 604a in which the next first diagnosis switch flag is determined.
In this determination step 604a, the value of the first diagnosis switch flag set/reset in the routine 300 described above is determined, and if it is set, it is determined that a request to display the first diagnosis information has occurred. The routine then proceeds to the first diagnosis display command routine 605a. This first
In the diagnosis display command routine 605a, codes for distinguishing the control devices as shown in FIG.
In order to display on the display device 7 a display of a combination of item codes for distinguishing the content of the diagnosis abnormality, a display command corresponding to each display is set in the display command register. The code that distinguishes this control device is the second one.
E/G (engine controller), A/C (air conditioner controller), as shown in Figures 1, 2, and 3.
An ESC (skid controller), an A/D (auto drive controller), etc. (not shown) are used. Also, the diagnosis abnormality item classification code for each control device 4a, 4b, 4c, and 4d is "01".
Expressed with Arabic numerals such as "02" and "11".
This first diagnosis display command routine 6
FIG. 8 shows the detailed arithmetic processing of 05a. In response to the above-mentioned operation, if there are multiple diagnosis abnormalities, a display command is issued at a fixed cycle (for example, every 2 seconds) in order of the lowest address number in one group, that is, according to a predetermined priority order. Rewrite the command cyclically.Also, if there is no diagnosis abnormality item to be displayed in one group, simply use "OK" to indicate that there is no abnormality.Next, in the judgment routine 604a, the judgment is NO.
If so, the process advances to the next determination step 604b in which the second diagnosis switch flag is determined. In this judgment step 604b, the above-mentioned routine 30
The value of the second diagnosis switch flag that is set/reset at 0 is determined, and if it is set, the first and second diagnosis information (1
It is determined that a display request for the group (group 2, group 2) has occurred, and the second diagnosis display command routine 605 is executed.
Proceed to b. In this diagnosis display command routine 605b, codes for distinguishing the control devices as shown in FIG.
A display command corresponding to each display is set in the display command register so that a combination display of item codes for distinguishing the contents of diagnosis abnormalities of 4c and 4d is displayed on the display device 7. In addition, for items for which abnormality flags are set for both groups 1 and 2, it is determined that the abnormality is continuing, and the lamp 7b used as a warning light is turned on at the same time as the diagnosis abnormality item display. A warning light lighting command is also set in the display command register, and abnormalities that are currently occurring and abnormalities that have occurred in the past are distinguished and displayed by lighting/extinguishing the warning light. In this case as well, in response to a plurality of diagnosis abnormalities, the display is cyclically rewritten at regular intervals (for example, 2 seconds), similar to the calculation processing of the first diagnosis display command routine 605a. Therefore, the user can prepare a correspondence table between diagnosis abnormality item codes and abnormality contents, thereby knowing the contents of the diagnosis abnormality and using it as a source of information for troubleshooting. When determining this error code, it is desirable to use the same code regardless of vehicle model if the error content is the same.
It is also desirable for troubleshooters to classify and allocate codes depending on the nature of the abnormality. Next, if the determination in the second diagnosis switch flag determination step 604b is NO, the process advances to determination step 606 in which it is determined whether or not there is an OK monitor display item, which is the next display priority. In this judgment step 606, all values of the flag group of each OK monitor item set/reset in the information search routine 300 are judged, and if one or more of them is set, it is judged that there is an OK monitor display item. OK monitor display command routine 60
Proceed to 7. This OK monitor display command routine 6
In 2007, the information search routine 300 set the abnormalities that should be alerted to the driver as an OK monitor.
According to the setting of the OK monitor abnormality flag, display commands corresponding to each display are displayed as words using alphabetic or katakana characters as shown in Figure 2 5, 6, 7, 8, and 9. Set in register. In addition, if you forget to remove the key, "IG KEY" and if you forget to turn off the light, "LIGHT"
When setting the "SW" display command in the display command register, also set the buzzer-on command at the same time. The "IG KEY", "LIGHT SW" and buzzer-on display command registers are set for a certain period of time (for example, 10 seconds). Both of these two items generate a warning when the driver attempts to exit the vehicle by turning off the ignition key switch 9c and opening the door, so a buzzer is also used to attract the driver's attention. If there are a plurality of OK monitor items to be displayed, the display command is cyclically rewritten at a fixed period (for example, 5 seconds) as in the calculation process of the first diagnosis display command routine 605a. If it is determined in judgment step 606 that there are no OK monitor items to be displayed, judgment step 6 is performed to judge whether or not to display the operation of Auto Drive and SpeedWoner, which have the next display priority.
Proceed to 08. In this judgment step 608, the operating information of the auto drive and the operating information of the speed winner processed in the communication information processing routine 400 are judged, and if there is information that either of them is operating, the operating information of the auto drive or the speed winner is displayed. The process advances to command routine 609. In this Auto Drive/Speedwinner operation display command routine 609, the display corresponding to the operating state of the Auto Drive/SpeedWoner operating display that is determined to be currently operating is displayed as shown in FIGS. 10 and 11. In order to display as shown in 12 and 13, display commands corresponding to each display are set in the display command register.
In the display example, "AUTO DRIVE" is an operation display indicating that vehicle speed control is in progress, and "A/D 100KM" is currently in the cancel state, but the vehicle speed setting for vehicle speed control has already been set and the resume switch (Fig. (not shown) indicates the operating state in which control can be started for automatic operation at a speed of 100 KM/h. "A/D MAIN" represents an operating state in which the main power of the vehicle speed control device 4b is simply turned on. "S/W 60KM" means that the lower limit vehicle speed at which the vehicle speed warning device operates and issues an alarm is 60.
This indicates that the vehicle is set to KM/h and is currently traveling at or below the set speed. Further, the blinking of the display indicates that the current speed of the vehicle is higher than the set vehicle speed, and the blinking of the display gives a warning to the driver. (Does not explain details about this feature) Also,
When it is determined in determination step 608 that the auto drive and speed winner are not operating, the process advances to determination step 610, which determines whether or not to display the engine rotational speed, which is the next display priority. In this determination step 610, it is determined whether or not the engine is rotating based on the engine rotation speed information processed in the communication information processing routine 400, and when it is determined that the engine is rotating, the process advances to the engine rotation speed display command routine 611. routine 400
A display command corresponding to the display of the engine speed processed in step 2 as shown in FIG. 14 is set in the display command register. Also, the determination routine 610
When it is determined that the engine is not rotating,
The process advances to routine 612, which instructs to display battery voltage or room temperature, which is the last display priority. This display command routine 612 displays the battery voltage and room temperature information input in the information search routine 300 as shown in FIG. 2, 15 and 16.
Set the display command corresponding to each display in the display command register. The display command routines 605a, 605b, 607, 609, 6 described above
After executing the routines 11 and 612, the process advances to the next display control routine 700 shown in FIG. This display control routine 700 sends a character display and warning light lighting command to the display device 7 in accordance with the display command set in the display command register in the display item selection routine 600 described above,
It also sends a buzzer activation signal to the buzzer 8. The calculation process of this routine 700 will be explained with reference to the detailed calculation flowchart shown in FIG. First, when this routine 700 is entered, the process proceeds to step 701 for determining the presence or absence of a buzzer activation command, and then proceeds to a routine 702 that refers to the buzzer activation command flag in the display command register and turns on the buzzer drive transistor if the flag is set. . If the buzzer activation command flag has been reset, the routine advances to routine 703 for turning off the buzzer drive transistor. After this routine 702 or 703, a transmission data presence/absence flag determination step 704 follows. This transmission data presence/absence flag is a flag for indicating that the data in the serial data transmission buffer has not yet been transmitted to the display device 7. If this flag is set, the arithmetic processing of this routine 700 is ended without doing anything. However, if the transmission data presence/absence flag has been reset, the process advances to routine 705, and a character code string (for example, "HEAD LAMP") is added to the character string to be displayed based on the character display and warning light/lights out commands in the display command register. , an 8-bit character code is provided for each character column) and a 1-digit data code that instructs the display to blink and the warning light to turn on/off is written into the transmission buffer register. Then, in the subsequent routine 706, the transmission data flag is set and the serial data transmission routine 900 is executed.
Set the digit counter and bit counter used in Then, the arithmetic processing of routine 700 is completed, and the process returns to information retrieval routine 300 according to the flowchart in FIG. Next, regarding the data transmission routine 900 in the interrupt routine of FIG. 4, the detailed calculation flowchart in FIG. 10, the serial data transmission timing chart in FIGS. 13 and 14, and the configuration of serial transmission data in FIG. 15. This will be explained according to the diagram. In Figure 13, 1 is the timing chart of the transmission data block, and as shown in the figure, there are an STX (start of text) code, N character codes from data 1 to data N (one of which is a flashing display and a warning). Light on/
This shows the timing at which the command data code for turning off the light) and the ETX (end of text) code are serially transmitted in sequence. FIG. 2 shows the transmission data presence/absence flag, and when the first timer interrupt occurs after this flag is set, the STX code starts to be transmitted. Also, at the same time as the transmission of the ETX code is completed, the transmission data presence/absence flag is reset. Also, the first
1, 2, 3, 4, and 5 in FIG. 4 are enlarged data transmission timings in FIG. 13 (timings for one digit of transmission data), and 1 indicates the timing at which a timer interrupt occurs every 1 msec. Further, 2 indicates transmission data. 3 indicates the timing at which the digit counter is decremented by one, which will be explained in FIG. 4 indicates the timing at which the bit counter is decremented by one, which will be explained in FIG. 10, and this is synchronized with the occurrence of a timer interrupt while the transmission data presence/absence flag is set.
5 indicates the bit counter set timing explained in FIG. 10, which occurs when the digit counter is not yet 0 after transmitting one digit worth of character codes (including the header). Furthermore, the first
FIG. 5 shows the structure of one digit of this serial transmission data. The transmission rate of this serial transmission data is 1000 bits/second, and it consists of 1 start bit (level low), 8 data bits (positive logic), 1 parity bit, and 1 stop bit (level high). In FIG. 10, when the data transmission routine 900 is entered, the process first proceeds to a transmission data presence/absence flag determination step 901, in which the value of the transmission data presence/absence flag is determined. If the flag has been reset, the arithmetic processing of routine 900 is immediately terminated; if it has been set, it is determined that there is display data to be transmitted, and the flow proceeds to the next routine 902. In this routine 902, the bit values indicated by the digit counter in the transmit buffer register and the bit position counter (bit counter) of each digit are read from the transmit buffer register, and the transmit output signal is set to high or low according to the value. Set to level. Then, the process advances to the next routine 903, where the value of the bit counter is decremented by one. Then, the process proceeds to a determination step 904 in which the value of this bit counter is determined, and it is determined whether or not the value of the bit counter is 0. If it is not 0, the arithmetic processing of this routine 900 is ended; Proceeding to the next digit counter subtraction routine 905, the digit counter is subtracted by one. Then, the process advances to judgment step 906 to determine the value of the next digit counter, and if the digit counter is 0, the process advances to routine 907 to reset the transmission data presence/absence flag. If the value of the digit counter is not 0, the routine advances to routine 908 for setting the bit counter to a predetermined value. That is, in this data transmission routine 900, while the data presence/absence flag is set, each time a timer interrupt occurs, the display character code set in the transmission buffer register is sequentially read one bit at a time, and the value is set. Correspondingly, the transmission output is set to high/low level, thereby transmitting serial data to the display device 7. In addition, in the above embodiment, when a plurality of abnormality contents of each control device occur, one display 7a is used to switch the display, but the display surface is enlarged and all abnormality contents are displayed in parallel. may be displayed. Furthermore, although the first and second diagnosis switches 1a and 1b are shown as instruction generation means, a display instruction may be generated using a voice recognition device. Furthermore, although the display device is shown as being provided inside the vehicle, it may be provided as an external display device if the display device is connected to an external diagnostic device for diagnosis. As described above, in the present invention, a plurality of control devices independently perform control according to a predetermined control program. A function is provided to detect and generate an abnormal signal using a diagnostic program, and the generation of abnormal signals from these multiple control devices is centrally managed by a central control device, and abnormal data regarding the generation of abnormal signals is stored for each control device. However, since the content of the abnormality occurrence is displayed on the display device based on the stored abnormality data when an instruction is issued from the instruction generation means, it is possible to detect an abnormality in a specific control device among the plurality of control devices installed in the vehicle. The contents of the abnormality can be displayed only when necessary by instructing the instruction generation means, so that the operator of the vehicle can easily recognize the contents of the abnormality, and moreover, the abnormality data stored in the central control device can be reset. Since the device is reset by the means, after the content of the abnormality has been recognized, there is an excellent effect that only the abnormal data resulting from the generation of a new abnormal signal can be stored and the content of the abnormality can be displayed.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
Fig. 2 is an explanatory display diagram for explaining the operation, Figs. 3 to 10 are arithmetic flowcharts showing arithmetic processing by the control program of the microcomputer in Fig. 1, and Fig. 11 is a configuration showing the structure of serial reception data. 12 to 14 are timing charts for explaining the operation, and FIG. 15 is a configuration diagram showing the configuration of serial transmission data. 1a, 1b...first components constituting instruction generation means;
Second diagnosis switch, 1c... Initial set switch as a reset means, 2
...Detector group, 4...Control device group, 6...Centralized management device, 6a...Microcomputer, 7...
Display device.

Claims (1)

[Scope of Claims] 1. In a vehicle equipped with a plurality of control devices that independently control various control target parts of the vehicle according to a predetermined control program, the plurality of control devices have control processes for the control target parts. Each of the control devices has a function of detecting a control abnormality in the control device itself using a part of the diagnostic program in the control program and generating an abnormal signal. A central control device that centrally manages each control device and stores abnormal data for each control device in response to the occurrence of an abnormal signal, and an instruction generation means that is operated by an external device and generates an instruction to display the details of the abnormality occurrence. , a display device that displays the details of the occurrence of an abnormality based on the abnormality data stored in the central management device when an instruction is issued from the instruction generation means; An abnormality display device for a vehicle, comprising: a reset means for resetting abnormality data. 2. The vehicle abnormality display device according to claim 1, wherein each of the plurality of control devices generates an abnormality signal indicating a location where the abnormality has occurred. 3. The abnormality display device for a vehicle according to claim 2, wherein the display device displays a symbol indicating the control device and a symbol indicating the location of the abnormality on the same display surface.