JPH02147448A - Trouble shooting device for car - Google Patents

Abstract

PURPOSE:To allow a person concerned to acknowledge certainly eventual absence of a control unit due to optional equipment by indicating the control unit ID information in lieu of self-diagnostic result information in case no such information is received from the control unit with indication instructed. CONSTITUTION:In a meter control unit 3 according to the present invention, a unit No. indication output signal with indication sequence output instructed by a managerial unit 9 is received therefrom, and a failure code indication output signal is received from a control unit with indication sequence output instructed. In case no appropriate unit exists in the system, the unit will never emit any failure code indication output signal, so that the meter control unit 3 will continues to keep the unit No. indication output signal received first from the managerial unit 9, and on an indicator 31, the indication '2**' will be given for a certain period of time in case no unit No. 2 exists. Thus the testing operator can acknowledge absence of unit without having any unfamiliar sense of displaying.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle failure diagnosis device that performs failure diagnosis of various functions using control units installed at various locations in an IJI vehicle.

(Prior art) With the shift to electronic control of automobiles, control units that control various functions of the automobile are installed in various parts of the vehicle, and these control units are connected with signal lines to send and receive necessary signals. A dual-purpose signal transmission system that performs dual-purpose control has been realized, and in particular, an automotive multiplex transmission system that uses a single multiplex transmission line as a signal line to prevent an increase in the number of signal lines is known. There is. Such a multiplex transmission system is disclosed, for example, in Japanese Patent Publication No. 61-32178.

In such a signal transmission system, each control unit has a self-diagnosis function for diagnosing failures of its various functions, and the self-diagnosis results of each control unit are displayed on the display device as necessary to detect various failures. This allows us to respond quickly and accurately to emergencies.

When displaying this fault, the management unit manages the display order of the self-diagnosis results of each control unit on the display device, and generally the self-diagnosis results of each control unit are displayed on the display device F sequentially for a certain period of time. It is now displayed.

(Problem to be solved by the invention) Since the control unit indicated by the display is an optional equipment, it may not exist in the system, and if such a defect exists, the display device cannot receive self-diagnosis results from the control unit. In this case, the failure indication in one display device is that the entire display section is blank.

However, this blank display gives the tester who is diagnosing the fault a sense of discomfort, and the tester must judge whether or not the fault has been diagnosed for the unit in question. The problem is that they are confused because they are unable to do so.

Therefore, even in the case where the control unit is not present because it is only an optional equipment, the present invention allows the tester to accurately recognize the absence of the 1 display F- without making him or her feel uncomfortable. The purpose is to

(Means for Solving the Problems) FIG. 1 is a diagram schematically showing a dual-purpose fault detection device according to the present invention.

The heavy-duty vehicle fault 1 cutting device according to the present invention includes a plurality of control units 401 to 4On each having a self-diagnosis function 401 arranged at various locations on the heavy-duty vehicle, and these control units 40. ~4
The management unit 42 includes a display device 41 for displaying self-diagnosis results of “On” and a management unit 42 for managing the self-1 cooling results of each control unit on the display device 41. The display device 41 has a holding means 411 for holding the control unit identification information, and the display device 41 has a holding means 411 for holding the control unit identification information, and the display device 41 has a holding means 411 for holding the control unit identification information. If the self-diagnosis result -1'i'i information is not received from the control unit that has been detected, the control unit identification information is displayed instead of the self-diagnosis result information.

(Operation) When displaying the diagnosis result on the display device 41, the unit identification information of the control unit to which the display instruction of the diagnosis result has been given is also sent to the display device 41 and held in the holding means 411. If the failure diagnosis result is not received by the display device 41 because the control unit for which the display of the diagnosis result was instructed is absent or the like, the display device 41 displays unit identification information of the control unit in place of the diagnosis result information. This makes it possible to eliminate the unnatural feeling of display 1''.

(Example) The present invention will be described in detail below with reference to one drawing.

FIG. 2 is a block diagram showing the ilj dual-use fault diagnosis device according to the present invention. In this embodiment, the fault diagnosis device for heavy duty vehicles connects the control units (notes) installed at various locations on the heavy vehicle by multiple routes, thereby providing an overall overview of the vehicle.
This is implemented in a multiplex transmission system l- that performs control. This multi-7p transmission system is a bus-type distributed automatic heavy-duty 14
△N, and an asynchronous time side line 1 that allocates the right to use the transmission path only when there is a message to be sent to each unit.
゛n (or packet multiplicity Ir<> is adopted,
The access control method (multiplex method) is C8MA/CD
method is adopted. .

In the figure, l is an engine control unit, 2 is an automatic transmission control unit, and 3 is a display 3 that displays the failure diagnosis results.
This is a meter control unit that accommodates and controls various meters including 1, and the display 31 consists of a 3-digit, 7-segment display. The meter control unit 3 also includes a memory that holds display data sent from other units. 4 is a steering switch control unit that processes signals from operating switches for telephone, audio, air conditioning, etc., 5 is an air conditioning equipment control unit, and 6 is an air conditioning equipment operating switch. The air conditioning switch control unit 1-j controls the air conditioning switch control unit 6. The switches housed in the air conditioning switch control unit 6 can be used as a multi-system fault diagnosis activation signal by combining them.

7 is a car communication system (CC8) control unit that mainly controls navigation, but also switch operations and display processing for TV, audio, air conditioning, etc., and generates a multi-system fault diagnosis activation signal by combining switches. You can also. Reference numeral 8 denotes a telephone control unit as a signal processing adapter for displaying a car telephone number on a CCS meter or for receiving steering wheel switch operation signals.

Reference numeral 9 denotes a joint box (J/B) control which is placed at the connection point of the harness such as the left or right cowl side and accommodates the engine control unit 1 and the automatic transmission control unit 2 via a non-multiplexed transmission path. It is a unit. This J/B
The control unit 9 normally performs control mainly based on timer control such as an illumination timer, but when diagnosing a fault, it determines whether to start/stop the diagnosis and issues instructions to the multiplexed units 3 to 9, and also controls the non-multiplexed units. It decodes the fault codes of 1 and 2 and converts them into multiplexed signals as display data, and further processes the fault diagnosis activation signal of the non-multiple+'fi system.
It also serves as a management unit that manages the entire system.

These units 3 to 9 are interconnected by a bus 10 as a multiplex transmission path made up of twisted pair wires, and asynchronous time-division multiplex communication is performed between the units using the tension method.

Each of these units 1 to 9 has a self-diagnosis function for failures, and each unit diagnoses whether the various devices housed in its own station are normal or abnormal based on a predetermined procedure, and each unit has the diagnosis results. Can be held in memory. As for control units 1 and 2, these diagnostic result data are sent to management unit 9 so that they can be held there. Further, unit numbers 1 to 9 are assigned to each unit 1 to 9, respectively.

The basic configuration of each unit 3-9 is shown in FIG.

As shown in the figure, a CPU 2 + for controlling various processes specific to each unit, this CP jJ 21 and a bus 10
Multi-i as a multiplex transmission control unit that interfaces with
1/F" module 22, an input/output interface 23 that serves as an interface between various devices housed in the node and the CPU 21, a connector 24, and the like.

The basic configuration of this multiple I/F module 22 is shown in FIG. This multi-i1i 1/F module 22
is multiplexed 1.5I221. It is configured to include a bus I/F circuit 222, an oscillator 223, and the like. Multiple L-s! 221 is a serial/parallel conversion function that converts the serial signal on the bus 101 into a parallel signal on the CPU internal bus, and 4 is a serial conversion function that performs the reverse conversion, bus! It has various functions such as a collision detection function that detects a collision between transmission frames on 0-L and controls the transmission timing, and a transmission/reception function that controls transmission and reception of data to and from the bus 10. The bus I/F circuit 222 is a driver that sends signals to the multiplex bus 10 and a multiplex bus! 0
It consists of a receiver etc. that receives signals from. Oscillator 223
is for generating an operating clock.

The frame former of messages received between units 3-9 is shown in FIG. This message is
Message start code SOM, message priority MP, network identification code N11), data area D
F, error check code ER, data end r code EOI)
, positive response for network control′? 5(ΔN C: Ac
knowledge for Network
It consists of a control area and a message end code ROM.

The message start code SOM is a 2-bit soto code S'3 that marks the start of the message. The message priority MP is a 4-bit message that indicates the priority of the message. The network identification code NID is a 4-bit network identification code.

The data identification code DID is the next data area 1:''
This is an 8-bit code for identifying the contents of the message, and allows the receiving unit to freely select messages on the bus IO (i.e., address free).
It is something. The receiving unit checks this data identification code DJD and confirms that the message is sent to its own unit.
Determine whether ~ is necessary or unnecessary, and if necessary, import the message.

The data area DF has a fixed length of 4 bytes and consists of a valid/invalid designation code V/I and data DT. The valid/invalid designation code V/l is used to designate the validity/invalidity of data U)T in the lower two bytes of the data area [)[-' for each bit. Data D1'' becomes a 2-byte data field when the valid/invalid designation code V/l is used, and a 4-byte data field when not used, depending on the message value.

The error check code E11 is a code that performs an error check using an 8-bit CRC. Data end-r code [
E OI) is CI-? Represents the end f of data including C code.

The predetermined response area ANC is a reception response signal return area for all units connected to the network, and this area is divided into a plurality of time slots (1 bit each) as shown in FIG. assigned to each unit of the network. When each unit successfully receives a message, it outputs a 1-bit acknowledgment ACK to the bus 10 at the time slot assigned to it in the acknowledgment area ANC of the message.

The operation of the device according to the fifth embodiment will now be explained with reference to the drawings. Fig. 7 is a flowchart showing the processing procedure during fault diagnosis in the management unit and SOTO 9, Fig. 8 is a flowchart showing the processing procedure during fault diagnosis in the control units 3 to 9, and Fig. 9 is a system evening/timing chat. It is.

In the timing diagram of FIG. 9, [A] is the state of the management unit 9, [B1 is the state of the corresponding units 1 to 9,
[C] indicates the display status of the display 31, ■ indicates a display order output instruction signal from the management unit 9, ■ indicates a unit number display output signal from the management unit 9, and ■ indicates a failure from the corresponding units 1 to 9. code display output signal, ■ is a failure indication on the display 31 when each unit 1 to 9 has a failure location, ■ is a failure indication on the display 31 when the automatic transmission control unit 2 of unit number 2 has no failure ,
■ is the display 3 assuming that the control unit 2 is not present.
The failure indications in 1 are shown respectively. Furthermore, in (1) and (2), it is assumed that a message is sent from each unit at the timing of the data change point, and that the display contents of the display 31 are switched at the data change points of (2) to (2).

First, the overall operation of the apparatus of this embodiment will be explained based on FIG. 9.

When the system enters trouble diagnosis operation, first the management unit 9
Then, a display order output instruction (1) and a unit number display output signal (2) are sequentially sent to the bus 10 at regular intervals to each of the control units 1 to 9. The display order output instruction signal ■ is a signal that instructs each unit 1 to 9 to send the fault code display output signal "i (:D" to the meter control unit 3 via the bus 10, and is sent with unit number 1. The unit number display output signal ■ is a signal for displaying on the display 31F the unit number i for which output is instructed in the display order in which the failure code display output signal ■ should be sent. From the management unit 9 it is sent directly to the meter control unit 3 via the bus lO.

The display 31 consists of a 7-segment display section with 3 digits.
The E digit becomes the unit number display section, and the 2nd dot digit becomes the fault code display section. For example, in the case of unit number l, this unit number display output signal ■ consists of "one signal". Here, the lower two digits of wood indicate that the display will be blank.

Upon receiving the display order output instruction from the management unit 9, the corresponding control unit 1 outputs the fault code obtained as a result of the self-diagnosis to the meter control unit 3 via the bus 10 as a display output signal ■. Here, the failure code consists of a 3-digit code, of which the most significant digit represents the unit number of the own unit, and the two leading digits represent the failure location or type of failure in the own unit in hexadecimal code. This is what I did.

This fault code display output signal (2) is such that when there are a plurality of fault locations in the display order instruction applicable unit i, the plurality of fault codes are sequentially sent out every second. Further, if there is no failure in the corresponding unit, a display code of "-1" representing no failure is output in place of the failure code.

That is, in the case of unit number 1, display output signals of N--J are output. In addition, this "--" code may be the last code output following those fault codes as a code indicating the completion of diagnosis after sending out the necessary fault codes in the event of a fault. be. The following failure code display output processing is performed sequentially for units 1 to 9. Therefore, on path 10, each display output signal is i
+i There will be no conflict.

In the meter control unit 3, each unit 1 to 9
A corresponding display is displayed on the display 31 J- in response to the display output signal ■ received from the display output signal ■. This meter control unit 3
first receives the unit number display output signal ■ from the management unit 9, which is instructed to output the display order, and then receives the fault code display output signal ■ from the control unit i, which is instructed to output the display order. It turns out. Therefore, the display on the display 31 in this case is as shown in FIG.
As shown in , for example, in the case of unit number l, first the unit number display r1**4 is -・fixed time (
For example, 0.2 seconds), and then the fault code is displayed r101J, r by overwriting this unit number display.
102J and r103J are performed at 1-second intervals, and finally, r1--J indicating the end of the inspection is displayed for 1 second.

In addition, if there is no failure in the relevant unit, see Figure 9 ■
As shown in , for example, in the case of unit number 2, the unit number display r2**J is first displayed for 0.2 seconds, and then "2--" indicating no abnormality is displayed.

Furthermore, if the corresponding unit does not exist in the system,
Since the failure code display output signal ■ is not emitted from the corresponding unit, the meter control unit 3 first receives the unit number display output signal ■ from the management unit 9.
For example, if unit number 2 does not exist, "2*" is displayed on the display 31 for a certain period of time as shown in FIG. 9 (■).

As a result, the examiner does not feel any discomfort due to the display.
It is possible to recognize the absence of a unit.

Note that the management unit 9 outputs a display order output signal, and the corresponding unit outputs a fault code display output signal accordingly, but even after a certain period of time L2 (for example, 5 seconds) has elapsed, the diagnosis is not performed from the corresponding unit. Ending code ``
--" is not issued, it is determined that the CPU of the corresponding unit is running out of control, and the management unit terminates the processing of the corresponding unit and outputs the next unit number in the display order.

Next, the detailed operating procedure of the management unit 9 will be explained below with reference to the flow chart of FIG. First, when the fault diagnosis is started (step St), a process is performed to read the fault codes held by the engine control unit 1 and the automatic transmission control unit 2 (step S3).

These fault codes are then sequentially sent to the meter control unit 3 via the bus 10 to display the fault status of the engine control units I-, I and the automatic transmission control unit 2 on the display 31 (step S4).

When this display ends (step S5).

Unit number i is set to 3 (step S6). Next, transmitting a display order output instruction signal ■ for unit number i;
A unit number display output signal ■ is transmitted (steps S7 and S8). Note that control units 1.2 with unit numbers l and 2 are already fault code indicators, so
Display order is not specified.

During this time, it is determined whether or not the diagnostic path r instruction has occurred (step S9). If so, the entire process is terminated (step S5I2), but if not, after the display order output instruction, the It is monitored and determined whether or not the failure code display output signal ■ has been sent to the bus 10 from the designated control unit i within 1 second (for example, 0.2 seconds) (step 510). If a fault code has been output, it is further determined whether a display code r i --J representing the completion of the fault diagnosis of the corresponding control unit 1 has been output to the bus 10 (step 5I3). If this code is output, it is assumed that the failure diagnosis of the corresponding control unit i has been completed.
The unit number i is updated (increased) by one (step 31
5) It is determined whether the updated unit number i exceeds the maximum value of unit numbers (1=9 in the embodiment) (step 516), and if it does not, the process returns to step S7 for the updated unit number i. and repeat the same process. If it exceeds, the process advances to step S17.

If the display code ri--J is not received in step SI3, steps 89 to S
If the display code is still not received after 2 seconds, it is assumed that a failure such as CP LJ runaway has occurred in the corresponding control unit i, and the unit number i is changed to 1. (Step 5I5)
).

In addition, if a failure code is not received within 1 second at step SIO, the system waits for reception for 1 second (step 511).
), if it is not received even after 1 second has elapsed, it is determined that the corresponding control unit i specified in the order does not exist in the system, and the unit number i is updated (Sude Tsubu Si
5). In this case, 5 display: 31 has unit number i
Only "i**" is displayed for about 1 second.

The above process is repeated until the unit number i reaches the end (step 816), and when it is finished, it is determined whether a diagnosis end instruction has been issued (step 517), and if so, all processes are executed. End r (step 518), otherwise the process from step S4 onwards is repeated again.

The detailed operation procedure of the control units instructed to display the display order will be explained below with reference to FIG.

First, it is determined whether the display order output instruction signal (2) from the management unit 9 is addressed to the own station (step S21).

If it is addressed to the local station, it is determined whether or not there is a failure as a result of self-diagnosis (step 522).

If there is no failure, the display code ri- indicating no failure is displayed.
--J to the meter control unit 3 via the bus IO (step 828). If there is a failure, set the failure code number, j, to rlJ (step 523).
, outputs the fault code with number j for 1 second (
Step S24.325). Thereafter, the number j is incremented by one, and it is determined whether failure code transmission for all numbers j has been completed (step 828). If it has not been completed, step S24 and subsequent steps are repeated; if it has been completed, the diagnostic path Y is not displayed and the display code r i --J is output (step 528), and the entire process is ended.9 In the above embodiments, 1 Although the case where the vehicle fault diagnosis device of the present invention is implemented on a multiplex transmission system using a bus format has been described, the present invention is not limited to this, and it is also possible to implement it on a ring format network, for example. The control method is not limited to the C3MΔ/C1) method, and various other methods such as the token access method are possible. The present invention is not limited to being implemented on a multiplex transmission system, but can also be implemented on a single transmission system in which each unit or unit is individually connected with a 5-inch wire. The number of display devices that display the failure diagnosis results is not limited to one; for example, a plurality of display devices may be provided, and each display device may display the self-diagnosis results of different control units.

(Effects of the Invention) According to the present invention, even if there is a control unit in the system that is absent due to an optional device, the unit identification information of that control unit is displayed, so the tester can Absence can be recognized without any sense of urgency on display. .

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically explaining a vehicle failure diagnosis device according to the present invention, FIG. 2 is a block diagram showing a vehicle failure diagnosis device as an embodiment of the present invention, and FIG. FIG. 4 is a block diagram showing the basic configuration of a multiplex node; FIG. 4 is a block diagram showing the basic configuration of a multiplex 1/F module in the node of FIG. 3; FIG. 5 is a diagram showing the frame format of a message; 6 is a diagram explaining the acknowledgment area ANC in the format of FIG. 5, and FIG. 7 is a diagram illustrating the processing procedure of the management unit in the embodiment.
FIG. 8 is a flowchart showing an example of the processing point order of each control unit in the embodiment. FIG. 9 is a timing chart of the entire system in the embodiment. l: Engine control unit 2: Automatic transmission control unit 3: Meter control unit: Steering switch control unit: Air conditioning equipment control unit: Air conditioning switch control unit: CC3 control unit: Telephone control unit: Joint box control unit: Bus: Display ANC area (J:l (L illusion Q\- to Ichimomi Kazuaki

Claims (2)

[Claims] (1) A plurality of control units with self-diagnosis functions arranged in various parts of the vehicle, a display device that displays the self-diagnosis results of these control units, and an instruction to display the self-diagnosis results of each control unit on this display device. A vehicle failure diagnosis device comprising a management unit for managing operations, the management unit having identification information transmitting means for transmitting identification information of a control unit instructed to display self-diagnosis results to the display device; The display device has a holding means for holding the control unit identification information, and displays the control unit identification information in place of the self-diagnosis result information when the self-diagnosis result information is not received from the control unit instructed to display. A vehicle fault diagnosis device configured to: (2) Claim (1) wherein the display device comprises a plurality of display sections each displaying the self-diagnosis results of different control units.
) vehicle failure diagnosis device.