JPH01301139A - Self-diagnostic device for vehicle - Google Patents

Abstract

PURPOSE:To easily switch the test mode of a self-diagnosis and to make the device inexpensive by providing a test mode specifying means which switches the test mode of the self-diagnosis with a switching signal sent from an external equipment. CONSTITUTION:An electronic controlling unit (ECU) 2 has a CPU 3, a RAM 4, a ROM 5, etc., processes various signals inputted through an input interface 6 according to a program stored on the ROM 5, and outputs a control signal through an output interface 7 and a driving circuit 18 according to the processed data. Further, the ECU 2 is equipped with the test mode specifying means which switches the test mode of the self-diagnosis with the switching signal sent from the external equipment. Then when the test mode of the self-diagnosis of the ECU 2 is switched, the switching signal is sent from the external equipment to the ECU 2 and then received by the ECU 2, and the test mode specifying means switches the test mode of the self-diagnosis.

Description

Detailed Description of the Invention [Field of Application of fI Awaju 1] The present invention provides a self-diagnosis mode of an electronic control unit that is transmitted from an external device by (, U(t, 7N%) of a vehicle Regarding self-diagnosis devices.

[Electrification problems that conventional technology and inventions aim to solve] In recent years, engines installed in wheels control the air-fuel ratio etc. in a weighted manner to provide comfortable drivability and reduce exhaust gas. Efforts are being made to improve purification, fuel efficiency, and L engine output.

Output signals from various sensors that detect the engine condition, or each scale such as an indicator, L-9
If the output signal for the engine is not correct, it will be difficult to control the engine accurately, resulting in low engine speed, low engine speed, poor fuel efficiency, and low engine output. li <.

To deal with this, recent electric control systems have a time t [15
It is equipped with a self-diagnosis function as disclosed in Publication No. 9-61740, 3, etc., and if a failure occurs in the tilt angle or injector, etc., the self-diagnosis function installed in the vehicle a Turn on (or flash) the ``refuse'' button to notify you of a malfunction.
The 1-rable data at this time is stored in a predetermined address of the non-volatile reading fortune-telling machine of the electronic 11111 control device of the vehicle.

Normally, the above-mentioned electronic 4) self-diagnosis side of the control device is tested. There are two check modes, such as mode), and these two check modes are used to turn on (or blink) the self-diagnosis lamp.

The above U-check mode is used when driving the vehicle in a hurry.
Self-diagnosis is performed under the driving pattern, and if an abnormality occurs, the J check lamp installed on the driver's seat panel lights up (or flashes T) to notify the C user of the abnormality. U check clamp lighting (flashing)
When the problem is recognized, the vehicle is brought to the dealer, but even if the abnormality is not reproducible, the trouble data at this time is stored in the non-volatile readable 4G mode.

= lj, The above D-check mode is a test mode used when connecting an external device for vehicle diagnosis at a dealership (Revis station) etc. When a diagnosis is made and an abnormality occurs, the D-check clamp installed in the electronic control device lights up (or blinks)? It is possible to perform a more detailed diagnosis than C1.

On the other hand, the above D-check 7-card includes time-consuming processes such as memory checks, and the test mode for self-diagnosis is set to the D-check 7-mode in the user's usage state during normal driving. This increases the number of times the electronic control device operates, which may interfere with its original control function.

Therefore, the above test mode is normally set to the U check mode, and switching between these (no check mode and D check mode) is done by connecting or releasing the test mode terminal drawn from the electronic control unit. Many of them are selected by switching routes.

In this case, the electronic control device is housed inside the driver's seat panel of the vehicle, and the test mode terminal connected to the electronic control device is also placed inside the driver's seat panel cover so as not to interfere with driving noise. Therefore, when switching to test mode, remove the panel cover, etc., and work in a narrow space.1. It wasn't f.

A prior art related to such signal path switching is disclosed in, for example, Japanese Patent Application Laid-Open No. 165728/1983, but this prior art includes a switching means for switching a signal path between a diagnostic device and a control device. This system allows the same diagnostic device to be used for control devices with different specifications.Moreover, it requires a special switching circuit between the control device and the diagnostic VfI device, which reduces the cost. invite.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a vehicle self-diagnosis device that can easily switch the self-diagnosis test mode of an electronically controlled flIS8i device and can be realized at a low cost. The purpose is to encourage

[Means and effects for solving the problem] The vehicle self-diagnosis device according to the present invention has a test mode designation function for switching the self-diagnosis test mode by a switching signal transmitted from an external device to an electronic control device mounted on the vehicle. We have the means.

That is, when switching the self-diagnosis test mode of the electronic control device, a switching signal is transmitted from an external device such as a vehicle diagnostic device to the electronic control device 21I. 4, this switching signal (-1 is received by the F electronic control headpiece,
The test mode for self-diagnosis is switched by the above-described mode designation means.

[Embodiments of the invention] Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 5 show a first embodiment of the present invention, and FIG.
Figure 1(b) is an external view of a vehicle diagnostic device connected to the vehicle's electronic control unit and displaying diagnostic data from sensors.
2 is a block diagram of the vehicle electronic control 2I device and the vehicle diagnostic device, FIG. 3 is a block diagram of the control means, and FIG. 1 is a flow chart 17 of a vehicle diagnosis procedure, and FIG. 5 is an explanatory diagram of trouble data storage means for storing trouble data.

(Configuration) The code 1 in the diagram is a vehicle such as a car, and the code 2 is 4 for this vehicle 1.
? 5 Electronic control unit (EC) that performs air-fuel ratio control etc.
U), and the central processing unit (CPU) 3 of this ECU 2
, read-only memory ([ΔM) 4, read-only memory (ROM) 5, and non-volatile read-only memory ([ΔM)]
non-volatile RAM) 4a, and input controller 1. -S6,
An output interface is connected via a path line 8.

Also, is there any cooling water connected to the input interface 1-6? iu'1
Water temperature signal Tw of sensor 9, air-fuel ratio feedback signal 02 of 02 tons Fiio, intake air amount signal Q1 of suction pipe negative pressure hinge 11, air conditioner operation signal AC1 of air conditioner switch SWI Medium speed sensor → medium speed signal S of 713 , idle operation signal of idle switch SW2 ID1 slot 1 health opening degree sensor 15 throttle l~le opening signal - "rθ, neutral f of neutral switch SW3) J operation signal N
T, the rotation speed signal N of the engine rotation speed sensor 17, etc. are input.

The ECU 2 data-processes each of the scale signals according to the program stored in the R0M5, and once stores the data in the RAM 4, the CPU 3 processes the data.
Various arithmetic processes are performed based on this stored data, and based on the Ni arithmetic processed data, 1. 2. Tsuyuel pump solenoid 1
4, 1 canister purge solenoid, EGR actuator 1-20, idle control I7 actuator 21,
Ignition coil 22 and injector 23
Outputs control signals to etc.

Roughly speaking, the drive circuit 18 is equipped with a self-diagnosis lamp.
A U check clamp (user check clamp) 23b and a D check clamp (dead-radiation I clamp) 23a are connected. This self-diagnosis lamp is for the ECU2 above.
When the built-in self-diagnosis 1I7i 1m function detects an abnormality in the system, the code corresponding to the failure location is read from the ROM 5 of the ECU 2 and displays the failure location. , lights up a plurality of lamps as appropriate, displays the number of blinks, etc., and displays the e1-rable code.

The above self-diagnosis function is realized by a self-diagnosis means 2a, a test mode specifying means 2b, a trouble data storage means 4a, and a Q-check clamp 23a configured as a part of the ECU 2 via the calculation means 2C, and each sensor and switch Self-diagnosis is performed on the input signals to the above-mentioned calculation means 2C and the output signals outputted to each of the seven cutuators via the drive circuit 18, which is an example of a drive means.

Further, the self-diagnosis means 2a includes a Uji clamp 23.
b is connected, and when the self-diagnosis function detects an abnormality in the system, it lights up (or flashes) the knobnic lamp 23b or the D-check lamp 23a, and the non-volatile RA, which is an example of trouble data storage means, is connected.
Store the trouble data at that time in Mna.

In addition, there are two check modes in the test mode of the self-diagnosis function, one is a check mode and the other is a check mode. As shown in the figure, in the U-check mode and the D-check mode, data is stored at different specific addresses.

Further, a test mode terminal 6a is connected to the test mode specifying means 2b for switching the test mode for self-diagnosis of the (J check t-doard and D block 7-dot). Specifically, the terminal 6a consists of a terminal B to which a predetermined voltage (5■) is applied to the boat P of the human power interface 6, and a terminal connected to ground.

Here, when the terminal A and the terminal B are connected, the port 1-P is connected to ground, the L signal is input manually, and the D check mode is designated by the test mode designating means 2b. On the other hand, when the terminal △ and the F terminal B are released, a predetermined voltage (5v) is applied to the boat P and H
When the signal is input, the U-check mode is designated by the test mode designating means 2b.

Further, the ECtJ2 is provided with an external connection connector 24, and an external device such as a vehicle diagnostic device 25 is connected to this external connection connector 24. This vehicle inspection Ig
The i-device 25 is provided with an input/output connector 26 on a vehicle diagnostic headpiece main body 25a, and is connected to the C[2 external connection connector 24 via an adapter harness 27.

Here, the vehicle diagnostic device 25 is prepared for a dealer's service station, etc. (there is a
1611 part 2B, a power supply circuit 29, etc. are installed, and an indicator part 30. A display 31, a T-board 32 having one stage of operation input, and the like are provided.

The control unit 28 is connected to a CPLI 36 connected via a path line 35, a timer 38 consisting of a frequency counter, etc., a human output ([10) interface 39, C)) connected to the LJ 36, etc. It consists of an I10 interface 40, and a memory cartridge 34 that can be freely connected to the outside via a connector 33.
There is.

The output signals of the various switches mentioned above are inputted manually to the input side of this 110 interface 40 via the output interface 1 of the CU 2. Furthermore, an indicator section 30 is connected to the output side of this I10 interface 40, and each of the above-mentioned switches is turned on and off, and the light emitting diode (LED) of the injector section 30 corresponding to the switch is connected to the output side of the I10 interface 40. )1. D2. ...010
lights up (or flashes), allowing you to check the operation of various switches.

Further, on the input side of the other I10 interface 39, the mode selection signal of the keyboard 32 and the E
From the output interface 7 of the CU 2 to the drive circuit 18
Various control signals to be output to the sensor and output signals from the various sensors described above are manually generated. Further, the output side of this I10 internoace 39 is connected to the human power interface 6 of the E Cu 2 and the display 31.

In addition, the memory cars 1 to 34 are selected via connectors 33 so that the vehicle diagnostic device main body 25a itself can imitate T7 compatibility with the program of the ECU 2 that differs depending on the vehicle type. It is designed to be able to be connected to the computer, and is provided with a ROM 4.1, which is an example of a storage means for storing diagnostic programs and fixed data.

Further, the timer 38 is provided with an L1 pulse generating element 42 for outputting a synchronizing signal.

Further, the power supply circuit 29 connected to the control unit 28 is connected to the power supply of the vehicle Φ1 via an ON/OFF operation switch SW4.

The control unit 28 also includes a keyboard interpretation means 43, a gramogram selection stage 44, a data communication means 45, a j-st mode determination means 46, a data code full 47, and an f-ta.
- code conversion f stage 48, data oil cylinder means 49, model discrimination means 50, program storage lower stage 51, display storage means 52, k
A pawl driving means 53 is provided.

Here, the keyboard interpretation means 43 interprets the diagnostic mode inputted from the 1-board 32, and is interpreted by the program selection 1 stage 4411 and the 1-board interpretation 1 stage 43. In addition, the data communication stage 45 transmits various request signals to the ECtJ2 and receives various data (7j). The test mode determination means 46 is a means for determining the test mode for self-diagnosis of the 1ECU 2 from the data received by the data communication means 45.

In addition, the above-mentioned data"-door pull 47 is configured in a part of the ROM 41 of the memory cartridge 34 as a table storing code numbers corresponding to the trouble data and abbreviations of the sensors in which the trouble has occurred. The code conversion means 48 searches and converts the code corresponding to the trouble, and displays it on the display 31.

Further, the program storage means 51 is configured as a table of programs corresponding to the diagnostic mode in the ROM 41 of the memory car 1 to the storage 34, and selects a program according to the diagnostic mode. called by means 44. Incidentally, a plurality of tables are provided depending on the type of medium scale, and the model determining means 50 selects a table corresponding to the vehicle type.

In addition, the ten display memory f stage 52 iJ specifically the above RA
It is set as a part of M37 and the above display 31
It stores and holds the display data.

Normally, when the ECU 2 is used by a user, the test mode of its self-diagnosis function is set to (no check mode) and the terminal B is It's liberated.

(Vehicle diagnosis procedure) Next, the Φ vehicle diagnosis procedure by the vehicle diagnosis device 25 is carried out in the fourth step.
The explanation will be based on the flowchart shown in the figure.

Before running the program, first connect the human output connector 26 of the vehicle diagnostic device 25 to the external connection connector 24 provided in the CU 2 of the vehicle 1, either directly or by connecting the adapter harness 27. Connected through cover.

First, turn on the power to the control unit 28 (step 55).
, initialize the F control unit 28 (step 5
6). From the data communication means 45 to the ECU 2 of the vehicle 1
A request for model number 1.8 is output (step 57). In addition, this model -] - code is the above-mentioned E CU 2
110 M 5 (is stored in advance).

Next, in step 58, it is determined whether the model code signal transmitted in response to the ECU 2 has been received. Received. If it is determined that the message could be received, the process advances to step 59; if it cannot be received, the process returns to step 58 and the determination is repeated.

In step 59, the CPU 36 identifies the model and stores the received Q-scale 21-code at a specific address in the RAM 37. Next, the process proceeds to step 60, where the model discriminating means 50 selects a table corresponding to the above-mentioned machine scale from among a plurality of tables stored in the ROM /l-1. As a result, a table corresponding to the program of the ECU 2 is specified, and the C
Diagnosis is performed according to the diagnostic program.

Next, in the smartphone 61, the operator manually operates the keyboard 32 to determine whether or not to switch the test mode for self-diagnosis of the ECU 2. 4-board interpretation means 43,
The contents of the key operation input are interpreted, and if it is a request for switching between the 7th and 7th keys, the process branches to step 90, otherwise the process proceeds to step 62.

If you do not change the test mode, in step 62,
The keyboard interpretation means 43 interprets the diagnosis mode input from the keyboard 32, and branches to step 65 and step 75 depending on whether the input is a normal diagnosis mode or a trouble data request mode. .

(Normal diagnosis mode) Here, if you specify the diagnosis mode of sensors (for example,
When diagnosing the output data of the cold M1 water temperature sensor, F-10 →
7→ENT and human power), this mode is sold by the CPU 36 of the control section 28, temporarily stored in a predetermined address of the RAM 37, and the process proceeds to step 65.

In step 65, the diagnostic code stored in the RAM 37 is called up, and at the same time the block ``1gram'' corresponding to the diagnosis mode is selected by the ``1gram selection'' stage 44, the abbreviation and name corresponding to the diagnosis mode are selected. Identification data such as medium is R
The information is read from the OM/II and stored in the storage means 52 (RAM).
37 predetermined address).

Next, in step 66, the data communication means 45 outputs a data transmission request signal IX corresponding to the diagnostic code to the ECU 2 of the vehicle 1.

Then, in step 67, the ECU 2 outputs the first data signal 3RX in response to the request signal, and is received by the data communication means 45.

Then, in step 68, this data signal RX is operated on by the data sieve means 49 to convert the physical quantity (binary number Y - 1 is converted into 1
The numerical data is converted into numeric data (116) in decimal notation and stored in the display storage means 52 (at a predetermined address in the RAM 37), and at the same time, the display driving means 53 stores the numerical data and the abbreviation and unit stored in Step 65eRΔM37. i Which fixed data should be output?

In the J-drive step 69, - [display drive hand [953]
The output signal is output to the display 31, and the display 31 displays the numerical data, abbreviation, and diagnostic mode number (key number 7 W3 manually operated).
, simple IQ, etc. are displayed. For example, in the case of the diagnosis mode of the above-mentioned cooling water temperature sensor, as shown in FIG. degC is displayed. Then, the process returns to step 61 and waits for the next key personnel.

(1-Rubble data request mode) 1-When requesting trouble data, specify the trouble data request mode from the keyboard 32 (for example, U''
When reading fTfT mode data, F-+B→0→E
NT), similarly CI of the control unit 28) IJ 36
At step 75, this mode is read and temporarily stored at a predetermined address in the RAM 37, and the process proceeds to step 75.

In step 75, first, in order to check the self-diagnosis test [-mode] of the ECU 2, the self-diagnosis 1/r stage 2a of the 7-mode mode fm (E CL) 2 by the i-st mode specifying means 2b is set to DfJ selected or The data communication means 45 requests the EC ('2) to transmit the data (in which state of the U-check mode is it placed?).

Next, in step 76, the test mode state data transmitted from the EC (J2) is received.

Then, in step 77, based on the received test mode state data, it is determined that the test mode determining means 46 (bus [mode) is the Dfl check mode and is in the U check mode. If it is determined to be full mode, the process proceeds to step 78; if it is determined that the mode is set, the process proceeds to step 80).

In step 78, the data communication means 45 requests the ECU 2 to transmit 1-rubble data of the LJ check trace.

Then, in step 79, the ECU 2 responds,
Trouble data is read out from a predetermined address of the nonvolatile RAM 4.8 shown in FIG. Proceed to step 82.

In step 82, the trouble data received in step 76 is sent to the code conversion means/1.8, and the code number and abbreviation corresponding to the trouble data are searched from the printer code converter 47. , display storage means 52 (RA
M37 at a predetermined address) (at this time, the data previously stored in the display storage means 52 is cleared) and simultaneously output to the display driving means 53, and the process returns to step 69.

In step 69, as shown in FIG. 1(b), the code (code number 24) corresponding to the trouble data and the abbreviation (Isc:
Idle speed control [1-le valve] etc. are displayed, and the process returns to step 61.

This work involves ascertaining the faulty part and details of the fault based on the code number and abbreviation displayed on the display 31, and inspecting the faulty part one by one.

On the other hand, if the snug 77 determines that the mode is 1) check mode, in step 80 the data communication means 45 requests the C12 to send the trouble data of the D check, and then in step 81 , the ECU 2 responds to a predetermined address of the non-volatile RAM 4a shown in FIG. 5 (for example, the address ooi corresponding to the D-check mode in this case).

Trouble data is read from ) and received by the data communication means 45, and the process proceeds to step 82.

Then, as mentioned above, from step 82 to suit part 69.
The code number corresponding to the trouble data and 1~
An abbreviation such as ``1-ichita'' is displayed, and the process returns to step 61.

(Test L-mode switching request) Next, when switching the self-diagnosis test mode of the ECU 2 to the D-check mode to diagnose the middle wheel, in step 61, operate the keyboard 32 to input a test L-mode switching request. (In this case, enter F→E→0→ENT, for example). This content is interpreted by the keyboard interpretation means 43, and the process proceeds to step 90.

In step 90, the data communication means 45 transmits a switching signal to the D check 7-word to the test 7-D designation means 2b of the EC(''2.
Due to the release of terminal Δ and terminal B, the test mode designation means 2b is forcibly designated to the D check mode (despite the 11-check mode designation (normal state of user use), and the self-diagnosis of the The means 2a is switched to the D-check upper mode by the test mode specifying means 2b, and the process returns to step 61.

However, the above [Cu2 self-diagnosis test mode]
Due to the switching signal sent from the vehicle diagnostic device 25,
It is possible to switch from the check mode to the Dfl check mode.

(Second example) Next, a second embodiment of the present invention will be explained.

FIG. 6 is a flowchart of the middle wheel diagnosis procedure according to the second embodiment of the present invention, and is a flowchart of step 5 in the first embodiment described above.
5 to 60, steps 65...6, and step 7
5 to 82 are the same as those in the first embodiment, so their explanations will be omitted.

(Death 1-Mode Switching Request) When the self-diagnosis of the ECU 2 is tested using the screen 61 in FIG. −→
Input O → ENT, in case of U check mode switching request,
For example, input F-+E→1→EN1), the process advances to step 95, and in step 95 it is determined whether the test mode switching request is a D-check mode switching request. If it is a D-check mode switching request, the process advances to step 96. , in the case of a U-check seven-card switching request, the process advances to step 97.

In step 96, a switching signal to the Dfr nickname mode is transmitted from the data communication means 45 to the test mode specifying means 2b of the ECU 2. Then, despite the U-check mode designation (normal state of user use) by releasing terminals A and B of the test mode terminal 6a, the test mode designating means 2b is forcibly designated to the D-check mode.
The self-diagnosis means 2a of the ECU 2 is switched to the D-check mode by the test need specifying means 2b, and the process returns to step 61.

On the other hand, if the mode has already been switched to the D-check mode and a request for switching to the U-check upper mode is inputted again via the keyboard 32, in step 97, the data communication means 45 switches to the test mode specifying means 2b. A FA 4M r3 to disconnect mode is sent. Then, the test mode designation means 2b is designated from the G, &D check mode to the Uf-:l Nick mode, and the self-diagnosis means 2a of the ECU 2 is switched to the U check mode by the test mode designation means 2b. Return to step 61.

Immediately, regardless of whether the terminal B is released or connected to the test mode terminal 6a, the test mode for self-diagnosis of the ECU 2 can be designated from the keyboard 32 and the test mode can be switched.

As a result, the task of switching the test mode for self-diagnosis of the ECU 2 can be performed without removing the vehicle's driver's seat panel cover, etc., and without having to connect or release the test mode terminal 6a in a narrow space. Easy to operate.

It should be noted that before the above Φ vehicle diagnostic device ``dead work mode change request is made at 〒125, or the above vehicle diagnostic device 25 is
As long as it is not connected to CU 2, f, i, the above E CU
The test mode for self-diagnosis in step 2 is the dead mode terminal 6a.
is set by releasing or connecting terminal B to the terminal of .

[Effects of the Invention] As explained above, according to the present invention, the electronic control device mounted on the vehicle is equipped with a test mode designation means for switching the self-diagnosis test mode by a switching signal transmitted from an external Il device. When diagnosing a fault, for example, simply by sending a switching signal from an external device such as a vehicle diagnostic device, the self-diagnosis test mode of the vehicle's electronic control device can be easily switched, greatly improving work efficiency. Improvement. However, it has excellent effects, such as being able to be realized at low cost without adding any special switching circuits.

[Brief explanation of the drawing]

1 to 5t show a first embodiment of the present invention, and FIG. 1(a) is an external view of a vehicle diagnostic device connected to the electronic control device of the vehicle and displaying diagnostic data of sensors, Figure 1 (b
) is an external view of the vehicle diagnostic device displaying the trouble code,
Figure 2 is a block diagram of the vehicle's electronic control device and vehicle diagnostic device, Figure 3 is a block diagram of the 11011 means, Figure 4 is the flow P-1 of the vehicle diagnosis procedure, and Figure 5 is the storage of trouble data. Explanatory diagram of trouble data storage means, No. 6
The figure is a flowchart of a vehicle diagnostic procedure according to a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Vehicle, 2... Electronic control device, 2b... Bust mode specification means, 25... External device. Figure 1 - 2229. - Figure 4 Figure 6

Claims (1)

[Claims] A self-diagnosis device for a vehicle, characterized in that an electronic control unit mounted on the vehicle is provided with test mode designation means for switching a self-diagnosis test mode using a switching signal transmitted from an external device.