JPH08183410A - Simplified diagnostic device in vehicular system - Google Patents

Abstract

PURPOSE: To provide a simplified diagnostic device in a vehicular system capable of having a plurality of electronic units (nodes) mutually connected together by a single or multipule bus lines make such simple diagnosis as a break down and a destination (a specification) even if an equipment for making diagnoses does not exist. CONSTITUTION: A control means 11-1 for a node provided inside a vehicle controls signal input from switches, sensors, etc., and a diagnostic means 11-2 forms diagnostic data by checking the items to be diagnosed at the time of diagnosis. A diagnose starting control means 11-3 forms diagnostic data by operating a specific operating means 13x of the vehicle when a diagnosis terminal 9a is connected to the earth and the vehicle speed is 0km/h. An output means 11-4 codes the diagnostic data and outputs it through an information means 7a existing on the vehicle. A specific node 1 of a plurality of nodes connected by a bus line B consists of the means 11-3 and the means 11-4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle system provided in a vehicle such as an automobile, and in particular, it checks for malfunctions of electronic units (nodes) mounted on the vehicle and specifications that differ depending on the destination. The present invention relates to a simple diagnostic device in a vehicle system.

[0002]

2. Description of the Related Art Conventionally, in this type of device, as shown in FIG. 26, a diagnostic connector B is connected to a node A to be diagnosed to which switches, sensors, loads, etc. (not shown) are connected.
Is provided in advance, and the diagnostic switch terminal of the fault diagnosis off-board device (tester) C and the communication line are connected to the node A through the connector B, and the node and itself are connected to the node A at the request of the tester C. Further, failure data such as switches / sensors and loads, and specification data different depending on the destination are returned to the tester C, and the returned data is checked to make a diagnosis.

Also, recently, as a vehicle system, a plurality of electronic units (nodes) each having a multiplex communication function are provided in various places in the vehicle and interconnected by multiple bus lines, so that electric wires are routed in the vehicle. Many of those that are designed to reduce the number of wires are being adopted.

[0004]

The above-mentioned conventional diagnostic apparatus requires a tester, and in the final check of the vehicle assembly process, an operator must carry the tester inside the vehicle and perform the check work. , Which is one of the causes of lowering vehicle productivity.

In particular, as described above, in the multiplex communication system adopted for the wire saving, when the failure of each node and the check of the destination (specification) are to be performed, each of the conventional devices described above is It is necessary to connect a tester to each node, which may impair productivity improvement due to wire saving.

Therefore, in view of the above-mentioned conventional problems, the present invention makes it possible to easily perform a diagnosis by checking a failure, a destination (specification), etc. without a device for diagnosis. A first object is to provide a simple diagnosis device in a vehicle system.

The present invention also provides a device for diagnosis in a vehicle multiplex communication system in which a plurality of electronic units (nodes) each having a multiplex communication function are provided in various places in a vehicle and interconnected by multiplex bus lines. A second object of the present invention is to provide a simple diagnosis device in a vehicle system that can easily perform diagnosis by checking a failure, a destination (specification), etc.

[0008]

SUMMARY OF THE INVENTION A simple diagnostic apparatus in a vehicle system, which is made in accordance with the present invention in order to achieve the first object, has a basic configuration as shown in FIG.
Switches and sensors 13 _{1 to} 13 n, loads 14 _{1 to} 14
A node 1 to which n and the like are connected is provided in the vehicle, and the node performs a diagnosis at the time of diagnosis, with a control means 11-1 for controlling input of signals from switches and sensors and output of signals to a load. In a vehicular system having a diagnostic means 11-2 for checking a power item and generating diagnostic data according to the result, in the node, when the diagnostic terminal 9a is connected to ground and the vehicle speed is 0 km / h, A diagnosis start control means 11-3 for causing the diagnosis means to generate diagnosis data by operating the predetermined operation means 13x,
It is characterized in that it has an output means 11-4 that codes the diagnostic data generated by the diagnostic data generating means and outputs it to the vehicle from the existing informing means 7a.

As shown in the basic configuration diagram of FIG. 1 (b), each of the simple diagnostic devices in the vehicle system according to the present invention to achieve the first object has a multiple communication function and a switch. -A plurality of nodes 1 to 4 to which sensors 13 _{1 to} 13n and loads 14 _{1 to} 14n are connected are provided in various places in the vehicle and are interconnected by a multiple bus line B, and each node has switches, sensors, etc. 1 for controlling the input of signals from the load and the output of signals to the load
1-1, diagnostic means 11-2 for checking items to be diagnosed at the time of diagnosis, and generating diagnostic data according to the result,
A vehicle system having a transmission / reception means 11-5 for transmitting control data used by the control means and diagnostic data generated by the diagnosis means to another node via the multiplex bus line and receiving from the other node. At
When the diagnosis terminal 9a is connected to the ground and the vehicle speed is 0 km / h, the specific node 1 of the plurality of nodes operates the predetermined operation means 13x of the vehicle to perform the diagnosis on its own diagnosis means. Diagnostic start control means 11-3 for generating data and causing the diagnostic means of another node to generate diagnostic data via the multiplex bus line
And the diagnostic data generated by the diagnostic data generating means of its own and the diagnostic data generated by the diagnostic data generating means of another node received by the transmitting / receiving means and coded and output to the vehicle from the existing informing means 7a. Output means 1
It is characterized by having 1-4.

The vehicle system is characterized in that the token is circulated between the nodes in order to perform cyclic communication.

The check items consist of specifications of each node, presence / absence of failure of each node itself, load connected to each node, etc., and the specific node starts generation of diagnostic data by the diagnostic start control means. When the ignition switch 13y is turned on, diagnostic data regarding the presence or absence of the fault is further included, and when the ignition switch is turned off, the output unit outputs diagnostic data regarding the specification to the notification unit. It has a feature.

The notifying means comprises a predetermined indicator lamp 7a in the meter 7 mounted on the vehicle, and is characterized in that the pattern corresponding to the code is displayed.

[0013]

In the device shown in FIG. 1A, the control means 11-1 of the node 1 provided in the vehicle to which the switches / sensors 13 _{1 to} 13n and the loads 14 _{1 to} 14n are connected is the switch / sensors. The diagnostic means 11-2 of the node 1 checks the items to be diagnosed at the time of diagnosis by controlling the input of the signal from the above and the output of the signal to the load, and produces diagnostic data based on the result. When the node 1 has the diagnosis start control means 11-3 and the output means 11-4, and the diagnosis start control means 11-3 has the diagnosis terminal 9a connected to the ground and the vehicle speed is 0 km / h, the vehicle The predetermined operation means 15 is operated to cause the diagnosis means to generate the diagnosis data, and the output means 11-4 codes the diagnosis data generated by the diagnosis data generation means to output it from the existing notification means 7a to the vehicle.

As described above, the diagnosis terminal 9 of the node 1
After connecting a to the ground, by operating a predetermined operating means 15 of the vehicle when the vehicle speed is 0 km / h, the vehicle already has a diagnostic result for the check item generated by the diagnostic means 11-2. Since the notification means 7a encodes and outputs the data, it is not necessary to separately connect a dedicated device for diagnosis.

In the device shown in FIG. 1B, each of a plurality of nodes 1 to 4 interconnected by a multiplex bus line B has a multiplex communication function and switches / sensors 13
_{1 to} 13n, loads 14 _{1 to} 14n, etc. are connected and provided in various places in the vehicle, and control means 11- of each node
1 controls the input of signals from switches and sensors and the output of signals to the load, and the diagnostic means 11-2 of the node 1
Checks items to be diagnosed at the time of diagnosis, generates diagnostic data according to the result, and transmits / receives the control data used by the transmitting / receiving means 11-5 by the control means and the diagnostic data generated by the diagnostic means via the multiplex bus line. Send to and receive from other nodes. Then, the specific node 1 of the plurality of nodes is the diagnosis start control means 11-.
3 and output means 11-4, and diagnostic start control means 11
-3, when the diagnosis terminal 9a is connected to the ground and the vehicle speed is 0 km / h, the predetermined operation means 15 of the vehicle is operated to cause the diagnosis means of its own to generate the diagnosis data and to form a multiple bus line. The diagnostic data of another node is generated via the diagnostic data of the other node, and the diagnostic data generated by the diagnostic data generation unit of the output unit 11-4 and the diagnostic data of the other node received by the transmission / reception unit are generated. The data and the data are coded and output to the vehicle from the existing notification means 7a.

As described above, after connecting the diagnostic terminal 9a of the specific node 1 of the plurality of nodes 1 to 4 to the ground, the predetermined operating means 15 of the vehicle is operated when the vehicle speed is 0 km / h. As a result, the diagnostic means 11-of the other node received from itself and via the multiplex bus line B
Since the diagnostic result for the check item generated in 2 is encoded and output by the notification means 7a that the vehicle already has, a plurality of dedicated devices are separately provided to diagnose the system having a plurality of nodes. No need to connect.

Further, the token is sequentially circulated between the nodes via the multiplex bus line to perform cyclic communication, and the diagnostic means 11-2 of the other node received from itself and via the multiplex bus line B. Since the diagnostic results for the check items generated by the above can be collected in a specific node 1 and the output means 11-4 can intensively output by the existing notification means 7a, troublesome work is not required.

Furthermore, a check item consisting of the specifications of each node, each node itself, and the presence / absence of a failure such as a load connected to each node is set in the ignition switch 13a when the diagnostic start control means starts the generation of diagnostic data. Since the diagnosis selection means 11-6 selects the ON / OFF state and the output means causes the notification means to output the information, the details of the diagnosis can be subdivided and made easy to understand.

Since the existing notification means is composed of a predetermined indicator lamp 7a inside the vehicle-mounted meter and the output means 11-4 displays the pattern corresponding to the code, the meter is operated by performing a predetermined operation while sitting in the driver's seat. The diagnostic result can be known by looking at the display section of.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment of an in-vehicle multiplex communication system to which the simple failure diagnosis device according to the present invention is applied. This embodiment is applied to a multiplex system of a vehicle body system, and in the figure, reference numeral 1 denotes an electronic device arranged inside a dashboard to which switches / sensors and loads provided around an instrument panel are connected. Control units A as units (nodes) are, for example, a control unit B housed in a junction box (JB) arranged inside the right side wall of the foot of the driver's seat, and 3 is a left side wall of the foot of the passenger seat, for example. The control units C and 4 disposed inside the vehicle are a control unit D disposed at the door of the driver's seat, 5 is a control unit E for controlling the electric seat, 6 is a control unit F for electrically controlling the steering wheel position, and 7 is It is a meter. These are interconnected via a multiplex bus line B.

Further, 8 is an indicator connected to the control unit A1, 9 is a diagnostic connector 9 provided in the control unit A1, and the diagnostic terminal 9a of this diagnostic connector 9 is not normally connected to any place. By connecting this to the ground, the control unit A1 enters the simple failure diagnosis mode using the beam indicator 7a in the meter 7. Instead of this, the diagnostic connector 9
When the failure diagnosis off-board device 10 is connected to the control unit A1, the control unit A1 enters a failure diagnosis mode using the failure diagnosis off-board device.

The control unit A1 is connected to, for example, a switch such as a dimmer switch, a lighting switch, a wiper switch, a fog lamp switch, a solar radiation sensor as a sensor, a display of a meter 7 and an ignition key illumination lamp as a load. There is. Also,
The control unit B2 is connected to the battery, the ignition switch ACC, IG1 and I via the fuse in the JB.
The G2 terminal is connected, and the switches include a parking switch, a wheel lock switch, a driver's door switch, a rear right door switch, a rear right door lock switch, and a seat belt switch, and an inner mirror actuator (motor) and a door lock as loads. Rear right door unit for driving motor, power window motor,
Room lamps are connected.

The control unit C3 is connected with various relays of a relay box, and includes an oil level switch, a passenger door switch, a passenger door lock switch, a rear left door switch, a rear left door lock switch, etc. as switches. Brake oil level sensor, fuel level sensor, washer level senna, etc. are connected as sensors, and passenger side door unit and rear left door unit, passenger side door mirror motor, wiper motor, washer motor etc. are connected as load. There is.

A driver seat key unlock switch, a driver seat key lock switch, a door lock switch and the like are connected to the control unit D4 as switches, and a power window motor and a driver seat mirror motor are connected as loads. A load such as a motor for electrically adjusting the seat is connected to the control unit E5, and a load such as a motor for electrically adjusting the steering wheel is connected to the control unit F6. The meter 7 includes a speedometer, a tachometer, and various alarm indicators including a beam indicator 7a. The speedometer and the tachometer process traveling pulses that are independently input and display them by themselves, and an alarm instruction is issued from the control unit A1. Although it is directly operated by a signal, it is also connected to other units through the multiplex bus line B.

The control unit A1, the control unit B2, the control unit C3, the control unit D4, the control unit E5, the control unit F6 and the meter 7 connected to the multiplex bus line B as described above constitute a node. Although only the load is connected to the control unit E5 and the control unit F6, the control unit E5 and the control unit F6 have a transmission / reception function and the meter 7 has only a reception function for the reason described later.

Therefore, the control unit A1, the control unit B2, the control unit C3, the control unit D4, the control unit E5, and the control unit F6 basically have substantially the same configuration. Three
As shown in. That is, the control unit A1
Includes a ROM 11a storing a control program and a RAM 11b having a data area and a work area, and a CPU 11 operating according to the control program. The CPU 11 has an output port O for sending data to the multiplex bus line B and an input port I for inputting data from the multiplex bus line B.
It is connected to the multiplex bus line B via 2a and 12b.

The CPU 11 also has input ports I ₁ -In,
It has I _D and I _K and output ports O ₁ to On, and the input ports I _{1 to} In have various switch sensors 13 _{1 to} 13 n connected to the control unit A 1 and the output port O 1. various loads 14 ₁ 14n is connected to the _{1 ~On.} Further, the input port I _D and I _K is provided only on the control unit A1, the diagnosis terminal 9a and the communication terminal 9 of the diagnosis connector 9 to the input port I _D and I _K
b is connected.

Among the switches and sensors 13 _{1 to} 13n connected to the node 1, when the diagnosis terminal 9a is connected to the ground and the vehicle speed is 0 km / h, C
It includes a dimmer switch (not shown) used as a specific operation means for causing the PU 11 to generate diagnostic data and starting diagnosis, and an ignition switch (not shown) used when selecting the content of the diagnosis. ing.

In the system having the above-mentioned structure, the character structure for data communication comprises a start, 8-bit data B0 to B7, parity and stop, as shown in FIG. Is 1.4 ms at a transmission rate of 7.8 kbps, for example. The frame structure is composed of a header, data and a block check character (BCC) as shown in (b), and an allowable interval time Tci is set between characters in the frame as shown in (c). . The header is (d)
As shown in (2), it consists of a 2-bit data ID, a 3-bit token that specifies the address of the other party to whom the token is delivered, and a 3-bit source address that indicates the source address. Further, as shown in (e), when the HALT condition that allows the self to enter the sleep state is satisfied, "1" is set to the most significant bit of the data 1 of each frame to indicate this. A flag bit is provided that is cleared when the sleep condition is not satisfied.

The data ID of the header is for designating the operation mode of the system. A mode for transmitting / receiving control data of the vehicle body system between the control units is designated by 00, and a request from the control unit A is designated by 01. The mode for transmitting and receiving the failure diagnosis data is designated by, and the mode for forced driving is designated by the communication command from the control unit. During the failure diagnosis mode, output control by communication performed in the normal mode is stopped. Further, when the data in the communication command mode is received, the received data from the other control unit is ignored and the designated load is forcibly driven according to the data from the control unit.

Control unit A1 and control unit B
2, each of the control unit C3, the control unit D4, the control unit E5, and the control unit F6 has, for example,
When addresses 000, 001, 010, 011, 100, and 101 are assigned and the token is passed to the next node, the partner address is set in the token of the header part of the frame structure and the self address is set in the source address, and the frame is set. Used to send.

In access by token passing,
Basically, the frame transmission is judged to be the end of the frame when the idle state of the multiplex bus line, that is, the state where there is no change in the multiplex bus line continues for a predetermined waiting time Tfw, and there is no error in the received frame. When the token of the header and the self address are compared and collated and the token whose result is coincident is received, the idle state of the multiplex bus line is further confirmed, and then the transmission is started within a predetermined time Tsw. . Control unit A1
When the token is transferred from the control unit B2 to the control unit B2, as shown in FIG. 5, a predetermined waiting time Tfw, for example, 1.6 ms has elapsed since the end of the last BCC of the transmission frame of the control unit A1. However, the control unit B2 starts transmitting the first header of its own transmission frame within a predetermined time Tsw, for example, 2.2 ms. Therefore, Tfw is referred to as a frame end confirmation time, and Tsw is referred to as a frame transmission start time.

FIG. 6 shows a state in which the token is sequentially circulated between the nodes to perform the cyclic communication, and the control unit A1 which has passed the token to the control unit B2 receives the token from the control unit E5. , The operation starts as one cycle until the transmission is started, and data is present in the multiplex bus line B at the longest time Tsw. In the case of five nodes as in this example, the typical cycle time Tcy _{1 in the} normal mode operation and communication command mode is, for example, the transmission rate of 7.8 kbps.
In case of, it becomes 50 ms.

When the sleep control for shifting to the sleep mode is performed in the above cyclic communication process, the control unit A1, the control unit B2, and the control unit C3.
And each node of the control unit D4 determines whether its own sleep condition is satisfied.

For example, in the control unit A1, when only the battery power is supplied, the ignition switch, the tail lamp switch, the head lamp switch, the passing switch, etc. are off, and the load control timers are all 0. And the sleep mode is entered when the sleep condition for communication is satisfied.

Next, in the control unit B2, when the ignition power supply is turned off, the load timers are all 0, and the driver's seat and the door switch after the driver's seat are off, it is judged that the self-sleep condition is satisfied. When the sleep condition for communication is satisfied, the device enters sleep mode. Then, in the control unit C3, when the ignition power is turned off, the load timer is all 0, and the passenger seat and the door switch after the passenger seat are off, it is determined that the self sleep condition is satisfied, and the communication unit When the sleep condition is satisfied, the sleep mode is entered, and the description of the control unit D is omitted.

Each node has the HA of all nodes.
After the LT condition is satisfied, the idle state of the multiplex bus line continues for a predetermined time, for example, 200 ms, and when the own HALT condition is also satisfied, the sleep mode is entered. For this reason, a means for confirming the establishment of the sleep conditions of nodes other than itself is required, and as a means for this, a HALT flag (satisfies the sleep condition with "1") in the communication data [Fig.
(See (e)] and as a method of erasing tokens from multiple bus lines, the node that first determines that the sleep conditions of all nodes including itself are satisfied, that is, the sleep condition of oneself is satisfied at the end. The node passes the token to itself instead of the next node in the order (address), so that the token disappears.

In the failure diagnosis mode, as shown in FIG. 7, the control unit F comes to have a transmission function and cyclic communication is performed by the six nodes consisting of the control units A to F, and the control unit A1. Is the control unit F6
It operates as one cycle from the reception of a token to the start of transmission.

Next, an outline of the data format of each control unit in the operation mode designated by the data ID of the header will be described.

First, as shown in FIG. 8A, the data in the normal mode in the control unit A1 is composed of a header, data 1, data 2 and BCC, and data ID is 0.
0, source address is 000, and, for example, B7 of data 1 is 1, B3 when its HALT condition is satisfied.
Is 1, when the lighting condition of headlamp low (LO) is satisfied,
B2 to B0 are set to 1 when the headlight high (HI), taillight and fog lamp lighting conditions are satisfied. B4 and B3 of data 2 are set to 1 when the driving conditions of the front wiper mist and the front washer are satisfied. As shown in FIG. 8B, the data in the failure diagnosis mode includes a header, data 1 and BCC, and a data ID of 01,
Source address is 000, and, for example, B7 of data 1
˜B4 are destination codes, B3 is a SW check flag, and B1 and B0 are set to 1 when the connector is disconnected.
The SW check flag of B3 is set to 1 when the SW input is accepted, and is cleared to 0 in the next transmission. As shown in FIG. 8C, the communication command data includes a header, data 1, data 2 and BCC, a data ID of 10, a source address of 000, and, for example, B7 of data 1 when all lamps are on. , B6 is wiper drive, B4 is door lock drive, B3 is power window drive, B4 of data 2 is door unlock drive,
B3 is set to 1 during power window down drive.

Next, as shown in FIG. 9A, the data in the normal mode in the control unit B2 consists of a header, data 1 to data 5 and BCC, and the data ID is 0.
0, the source address is 001, and, for example, B7 of data 1 is when the own HALT condition is satisfied, B6 is when the lighting condition of the seat belt indicator is satisfied, and B5 is
Is set to 1 when the door lock SW is locked, B4 and B3 are set to 1 when the door is opened / closed, and B2 to B0 are set to 1 when the ignition SW is turned on.
0 is used as a control code. As shown in FIG. 9B, the data in the failure diagnosis mode includes header, data 1 to
It consists of data 3 and BCC, data ID is 01, source address is 001, and, for example, B1 to B of data 1
4 is a destination code, B3 is a SW check flag, B
2 to B0 are set to 1 when the connector is disconnected, B7 of the data 2 is set to 1 when the rearview mirror is abnormal, and B4 to B0 are set to 1 when the fuse is blown. The data in the communication command mode is data in which only the data ID portion in the header of the data in the normal mode shown in FIG. 9A is changed to 10 in the communication command mode.

The normal mode data of the control unit C3 is
As shown in FIG. 10A, it is composed of a header, data 1 to data 5 and BCC, data ID is 00, source address is 010, and, for example, B7 of data 1 is its own H.
When the ALT condition is satisfied, B6 and B5 are the rear front doors, and B3 to B0 are the shift positions D, N,
When R and P, B7 of data 2 is when the fuel level warning indicator lighting condition is satisfied, B6 and B5 are when the front and rear door lock SW is locked, and B4 of data 4 is when the oil level indicator lighting condition is satisfied. To 1 for each. As shown in FIG. 10B, the failure diagnosis mode data includes a header, data 1 to data 4 and BCC, a data ID of 01, a source address of 010, and B7 to B4 of data 1, for example, a destination code, B3 is S
W check flag, B2 is B0 when the door mirror is abnormal
Are respectively set to 1 when the connector is disconnected. The data in the communication command mode is data obtained by changing only the data ID portion in the header of the data in the normal mode shown in FIG. 10A to 10 in the communication command mode.

The normal mode data of the control unit D4 is
As shown in FIG. 11A, it is composed of a header, data 1 to data 3 and BCC, data ID is 00, source address is 011 and, for example, B7 of data 1 is HALT.
Flags, B6 and B5 are when the door key lock SW and the door lock SW are on, B4 and B3 are when the remote control mirror left and upper SW are on, and B4 and B3 of data 2 are when the remote control mirror left and upper SW are on. 1 for each
It is said. As shown in FIG. 11B, the failure diagnosis mode data consists of a header, data 1 and data 2 and BCC, data ID 01, source address 011 and
And, for example, B7 to B4 of data 1 are the destination code, B3
Is a SW check flag, and B2 is 1 when the door mirror is abnormal. The data of the communication command mode is
This is data in which only the data ID portion in the header of the data in the normal mode shown in FIG. 11A is changed to 10 in the communication command mode.

The normal mode data of the control unit E5 is
As shown in FIG. 12A, the header, data 1 and BC
It consists of C, data ID is 00, source address is 10
0, and B7 of data 1 is a HALT flag, B
5 to B0 are sheet data. As shown in FIG. 12B, the failure diagnosis mode data includes a header, data 1 and data 2 and BCC, a data ID of 01, a source address of 100, and, for example, B1 to B of data 1.
Reference numeral 4 is a destination code, and B3 is a SW check flag. The control unit F6 has only the fault diagnosis mode data, and as shown in FIG. 13, it is composed of a header, data 1 and data 2 and BCC, a data ID of 01, a source address of 101, and for example B7 to B4 of data 1. A destination code and B3 are SW check flags. The data in the communication command mode is data in which only the data ID portion in the header of the data in the normal mode shown in FIG. 12A is changed to 10 in the communication command mode.

The function of each control unit in the system having the above configuration will be further described. First, the control unit A1
As shown in FIG. 14, when the vehicle speed is 0 km / h,
If the diagnosis terminal of the diagnostic connector 9 connected to this is connected to the ground and the input port _{ID of the} CPU 11 becomes low level, or if the diagnostic connector off-board device 10 is controlled by the diagnostic connector 9, the operation up to that point is completed. Change from normal mode to failure diagnosis standby mode. In this failure diagnosis standby mode, the multiplex communication of the vehicle body system and the functions of each connection unit perform all normal operations, and when the vehicle speed occurs, the normal mode is restored.

In the failure diagnosis standby mode, the vehicle speed is 0 km / h. In this state, however, if the operation of switching the dimmer switch from the high beam to the low beam for two reciprocations is performed for a fixed time of 5 seconds, the simple failure diagnosis is performed. Enter the mode. This simple failure diagnosis mode includes a switch diagnosis mode, a failure detection mode, and a foreign matter detection mode. Furthermore, when in the failure diagnosis standby mode,
The control unit A1 starts communication when an address is input from the fault diagnosis off-board device 10 within a predetermined time after the ignition (IG) switch is turned on.

The mode switching method in the simple failure diagnosis mode is summarized as shown in FIG. 15. In any mode, it is normal when the diagnostic terminal becomes H level for 0.5 seconds or more, or the vehicle speed occurs. Return to mode. Further, when the diagnosis switch is input during the failure detection mode, the switch diagnosis mode is immediately entered. To shift to the failure detection mode again, turn the IG switch off and then turn it on again.

In the switch diagnosis mode, switch diagnosis is performed when a predetermined switch is changed while the ignition (IG) switch is ON, and the beam indicator in the meter 7 is turned on by the change of the switch and built in an arbitrary control unit. The buzzer is lit, and the lighting and ringing time is, for example, about 0.1 seconds. The switches diagnosed in this mode include, for example, a lighting switch, a dimmer switch, a fog lamp switch and the like connected to the control unit A1, and a door switch, a seat belt switch and the like connected to the control unit B2, and a control unit C3. For example, the connected door switch, each power window switch, etc., the electric mirror switch etc. connected to the control unit D4, the power seat operating switch connected to the control unit E5, and the tilt connected to the control unit F6. An operation switch is included.

In the failure detection mode, the IG switch O
In the N state, failure information of each control unit (connector disconnection, fuse blown, unit abnormality, sensor abnormality) is notified by a lighting / extinguishing pattern of the beam indicator in the meter 7. The turn-on / off pattern follows a fault code consisting of a 2-digit hexadecimal number. Regarding the unit abnormality, when the control unit A1 cannot continuously receive the communication data from the target unit for one second or more, it is determined that the target unit is abnormal.
The abnormality monitoring is performed for the first 3 seconds of the check lamp display timing from the time when the communication mode becomes the failure detection mode.

In the foreign matter detection mode, the IG switch O
In the OFF or ACC state other than N, the destination code of each control unit is output by turning on / off the beam indicator in the meter 7 in the order of younger numbers, thereby detecting a different product of the control unit. However, as for the destination code to be output, the upper order is the unit code of the control unit A to the control unit F, and the lower order is the destination code of domestic, domestic (high grade), North America, Germany and the like.

When all the failure information of each control unit is normal in the failure detection mode, the lighting pattern of the beam indicator in the meter 7 is as shown in FIG. 16 (a).
For example, it is an on / off continuous blinking signal for 0.25 seconds. In the case of multiple items of failure, the data is output continuously in ascending order of the numbers, and turns off when all the displays are completed. Further, FIG. 16B shows an example of a display pattern when the failure code is "22".
It becomes as shown in.

Failure diagnosis connected to the diagnostic connector 9 The request from the off-board device 10 is the failure diagnosis mode when the failure diagnosis is made, the communication command mode when the forced drive is made, and the normal mode when no request is made. There is.

In the failure diagnosis mode, since the control unit A1 collects failure diagnosis data from other control units, the failure diagnosis data corresponding to the request code from the failure diagnosis offboard device 10 is collected. Return to. In the command communication mode, the control unit A1
When the request code corresponding to the content of the forced drive from the failure diagnosis offboard device 10 is input, the communication command mode data is transmitted to force each control unit to perform the forced drive, and the drive status is checked for the failure diagnosis offboard device 10. Return to.

In order to detect the connector disconnection in the above-mentioned failure diagnosis data, for example, the method shown in FIG. 17 can be applied. The illustrated multiplex communication system comprises a control unit X and a control unit Y interconnected by a multiplex bus line B. The control unit X then loads the loads R _{1 to} R ₃ such as the nearest three actuators connected via the load side wire harness WH ₁ , the intermediate connectors C _{1 to} C ₃ and the control unit side wire harness WH ₂ . The control unit Y includes a load side wire harness WH ₃ , intermediate connectors C _{4 to} C ₆ and a control unit side wire harness WH.
_The loads R ₄ and R ₅ such as the nearest two actuators connected via ₄ are respectively driven and controlled.

The load side wire harness WH ₁ and the control unit side wire harness WH ₂ have intermediate connectors C ₁ to
When C ₃ is fitted, electric wires L _{1 to} L ₄ for connector disconnection detection that form a circuit from the control unit X to the ground are added. Further, when the intermediate connectors C _{4 to} C ₆ are also fitted to the load side wire harness WH ₃ and the control unit side wire harness WH ₄ , a wire L for detecting connector disconnection forming a circuit from the control unit Y to the ground.
₅ ~L ₈ is added.

The wires L _{1 to} L ₄ and L _{5 to} L ₈ are connected between the control unit X and the control unit Y and the ground when the intermediate connectors C _{1 to} C ₃ and C _{4 to} C ₆ are normally fitted. The electric potentials of the electric wires connected in series and connected in series on the control unit X and control unit Y sides become the ground electric potential. However, when not engaged properly with one intermediate connector C ₁ -C ₃ may be the control unit X detects connector detachment, properly with one intermediate connector C ₄ -C ₆ fitted If not, the control unit Y can detect disconnection of the connector.

In the case of such a configuration, by connecting the control unit to the nearest control unit by blocking the place where the connector is difficult to confirm or the place where the intermediate connectors are concentrated, the connector can be easily detached without troublesome work. In addition, it is possible to easily detect the connector disconnection location for each set of electric wires for detecting the connector disconnection.

The details of the operation of the apparatus outlined above will be described below with reference to the flowcharts of FIGS. 18 to 25 showing the processing performed by the CPU of each node according to the control program.

FIG. 18A shows the CPU of the control unit A1.
11 is a main routine, (b) is another control unit B2
-The main routine of CPU of control unit F6 is shown, respectively. First, the CPU 11 of the control unit A1 starts its operation when the power is turned on, and initializes it in the first step S1 of the main routine of FIG. 18 (a) to clear timers and interrupts. Then step S2
To determine whether it is in sleep mode,
If this determination is YES, the process proceeds to step S3 and waits for the wakeup input. If the wakeup input is received, the process proceeds to step S4 to switch the sleep mode to the normal mode, and then returns to step S2.

At this time, since the determination in step S2 is YES, the timer management processing in step S5, the mode (ID) switching processing in step S6, the input / output (control) processing in step S7, the failure display processing in step S8, and step 9 are executed.
After performing communication processing with the external tester in step S2
Returning to step S5, steps S5 to S9 are repeated until the determination in step S2 becomes YES. In the timer management processing of step S5, time management such as various timer interrupt processing is performed, and in the input / output processing of step S7, CP
Switches and sensors 13 ₁ to ₁ connected to U11
Inputs the signal from the 3n drives and controls the load 14 ₁ 14n such as a motor or a lamp, the reception of the request command from the tester in the communication process with the external tester Step 9, the set of flags, the data collected To send. However, the process of step S9 is executed only in the tester failure diagnosis mode.

The main routine of FIG. 18 (b) executed by the CPU 11 of the other control unit is the main routine of FIG. 18 (a) except that the mode (ID) switching process of step S6 and the failure display process of step S8 are not performed. The description is omitted because it is almost the same as.

Control unit A1 to control unit F6 C
The PU 11 connects the buffer amplifier 12b to the multiplexed bus line B.
If it is determined that a signal has been input to the input port I connected via, the reception interrupt process shown in the flowcharts of FIGS. 19 and 20 is started. However, in the normal mode, the control unit E5 and the control unit F6, which have no transmission function, have slightly different steps regarding transmission,
The details are omitted here.

Then, in the first step S2a,
It is determined whether the reception error check is OK.
The reception error is checked in character units, the parity is calculated from the received data, and the calculated parity is compared and collated with the received parity. If the comparison result is a mismatch, the determination in step S2a is NO, and it is determined that there is a parity error, the process proceeds to step S2b to perform error processing, and then returns to the main routine of FIG.

When the determination in step S2a is YES, that is, when the reception error check is OK, the process proceeds to step S2c and the data for one character is stored in the RAM.
After storing in the frame buffer area formed in 11b, the process proceeds to step S2d, where it is determined whether reception for one frame is completed. If reception of one frame is not completed and this step S2d is NO, the process returns to the main routine of FIG. 18, and if the determination is YES, the process proceeds to step S2e.

In step S2e, it is determined whether or not the BCC check of the received frame is OK.
The check of the received BCC is performed by a so-called checksum system in which the header to the final data of the received frame is added in character units and the added value is compared and collated with the received BCC. If the result of comparison does not match, step S
The determination of 2e is NO, and it is assumed that there is a BCC error, the process proceeds to step S2b above, and after error processing is performed,
Return to the main routine of 8.

When the determination in step S2e is YES, that is, when the received one frame has no error,
Proceeding to step S2f, it is determined whether or not the token in the header received here, the source address, and the self-address match, and when the three match and the determination is YES, FIG.
Returning to the main routine of No., when the three do not match and the determination is NO, the process proceeds to step S2g. This step S2f
Is a step for determining whether or not the received data is the data received by the node, which has finally entered the sleep state, by setting its own address in the token and sending it back.

In step S2g, it is determined whether the data ID in the received header is 00, and if this determination is ΝO, the process proceeds to step S2h to determine whether the ID is 01. Also, if ΝO, the process proceeds to step S2i and it is determined whether the ID is 10. If the determination in step S2i is NO, the process proceeds to step S2b, where error processing is performed assuming that the ID has an error, and then the process returns to the main routine of FIG.

If the determination in step S2g is YES.
If the ID is 00, step S2
j₁Go to and set the communication mode to normal, and then proceed to the next step.
S2j ₂To change the data format for normal mode.
Then, the process proceeds to step S2k. In step S2k
Is the source address and data of the header in the received data.
Data 1 in the RAM 11b depends on the first bit of data 1
Node-specific HALT flag management area formed at the rear
About A, update the HALT of other node of the transmission source
To step S2p (see FIG. 20). And above
When the determination in step S2h is YES, that is, I
When D is 01, step S2m₁Go to Communication Mode
To the fault diagnosis and the next step S2m₂With data
After changing the format to the fault diagnosis mode,
When the determination in step S2i is YES, that is, ID
Is 10 then step S2n₁Go to the communication mode
Is set to the communication command and the next step S2n₂With data
Step after changing the format for communication command mode
Proceed to S2p (see FIG. 20).

When the data format is changed to the failure diagnosis mode in step S2m ₂ , the control unit F6 as the third node having only the receiving function has the transmitting function. Change both the source address of the node and the token address of the recipient of the token. In this way, it is necessary to actually change the addresses of all the control units when the first address 000 already used by another control unit is given to the third node. This is not done, and the address given to the third node is assigned an address that is +1 to the already used address, so in such a case, it was the last address until then. Only the token address of the control unit needs to be changed, and it is not necessary to change both the source address and the token address of the other control units.

In step S2p, it is determined whether or not the token of the received header is its own address, and if it is not its own address and the determination is ΝO, the process proceeds to step S2q and the HALTs of other nodes are all set to 1. It is determined by checking the HALT flag management area for each node. When the determination in step S2q is NO, the process returns to the main routine of FIG. 18, and when the determination is YES, the process proceeds to step S2r to perform the self-HALT.
Determines whether or not satisfies the sleep-enabled condition. When the determination is YES, the process returns to the main routine of FIG. 18, and when the determination is YES, the process proceeds to step S2s to set the sleep flag and then returns to the main routine of FIG.

When the determination in step S2p is YES, that is, when the received token is its own address, the process proceeds to step S2t, and it is determined whether or not the self HALT satisfies the sleep enable condition. If the determination in step S2t is NO, step S2
After proceeding to u to clear the HALT flag in the transmission data, the process proceeds to step S2v. In step S2v, the token normal process is performed to set the partner address in the transmission token, and then the process proceeds to step S2z ₁ .

If the determination in step S2t is YES, that is, if the self HALT satisfies the sleep-enabled condition, the process proceeds to step S2w, where the HALT flag in the transmission data is set, and then step S2.
Go to 2x. In step S2x, H of another node
It is determined whether the ALT is all 1 by checking the HALT flag management area. This step S2
When the determination of x is ΝO, the process proceeds to step S2v,
If YES, that is, if the HALTs of the other nodes are all 1, the process proceeds to step S2y, the token disappearance process is performed to set the self address in the transmission token, and then the process proceeds to step S2z ₁ .

In step S2z ₁ , a transmission frame consisting of a header, data and BCC is set, then the flow proceeds to step S2z ₂ to initialize the transmission counter,
Back from started the transmission start timer in the next step S2z ₃ to the main routine of FIG. 18.

C of control unit A1 to control unit F6
When the PU 11 starts the transmission start timer in step S2z ₃ of the reception interruption process, it starts the transmission timer interruption process shown in the flowchart of FIG. 21, and whether the transmission start timer times out in the first step S1a. It is determined whether or not, and if this determination is NO, the process returns to the main routine of FIG. When the determination in step S1a is YES, that is, when the transmission start timer times out, the process proceeds to step S1b, and it is determined whether or not the content of the transmission counter indicates the end of transmission. When the determination in step S1b is NO, the process proceeds to step S1c to transmit the next data, and the process proceeds to step S1d to update the transmission counter and then returns to the main routine of FIG. When the determination in step S1b is YES, that is, when the transmission counter indicates the end of transmission, the process proceeds to step S1e to set the transmission end flag and then returns to the main routine of FIG.

The CPU 11 of each control unit performs the timer management process of step S1 to input port I to which the multiplex bus line B is connected via the buffer amplifier 12b.
When the idle state, that is, the state where no signal is input continues for a predetermined time, for example, 200 ms, the sleep transition timer interrupt process shown in the flowchart of FIG. 22 is started. Then, in the first step S1h, it is determined whether or not the sleep flag is 1, and when this determination is ΝO, it is determined in step S1i whether or not the transmission token is the self-address, and this determination is ΝO. 18 returns to the main routine of FIG. 18, and if the determination is YES, the process proceeds to step S1j to determine whether or not the transmission end flag has been set, and when the determination is NO, returns to the main routine of FIG. . Further, if the determination in step S1h is YES and the sleep flag is 1, or if the determination in step S1j is YES and the transmission end flag is complete, the process proceeds to step S1k, where the own node is set to the sleep mode. After shifting, the process returns to the main routine of FIG.

The CPU 11 of the control unit A1 performs the process shown in FIG. 23 in the mode (ID) switching process of step S6 of the main routine. First, in step S6a, the diagnostic terminal is checked to determine whether it is H or L level. When the determination is H level, that is, when the diagnosis terminal is not connected to the ground, the process proceeds to step S6b to set the data ID to 00 to set the normal operation mode, and then returns to the main routine of FIG. When the determination in step S6a is L level, that is,
When the diagnostic terminal is connected to the ground, the process proceeds to step S6c to check the vehicle speed and the vehicle speed is 0 km / h.
If the determination is YES, that is, if the vehicle speed is occurring, the process proceeds to step S6b in FIG.
Return to the main routine of 8. When the determination in step S6c is YES, that is, when the vehicle speed is 0 km / h, the process proceeds to step S6d.

In step S6d, it is determined whether or not the diagnosis by the fault diagnosis off-board device (tester) is started. The determination in step S6d is that the IG switch is ON.
It is carried out depending on whether or not an address is input from the tester within a predetermined time from, and when the address is not input within the predetermined time and the determination is ΝO, the process proceeds to step S6e. In step S6e, it is determined whether or not there is a simple diagnosis start operation by two reciprocating operations of the dimmer switch, and if there is no such operation and the determination in step S6e is NO, step S6.
It returns to the main routine of FIG. 18 through b.

When the determination in step S6e is YES, the process proceeds to step S6f, and it is determined whether or not the IG switch is ON. When the determination is ΝO, step S6g.
Proceed to. In step S6g, the data ID is set to 01 to enter the failure diagnosis mode (detection of foreign matter), and then the process returns to the main routine of FIG. The determination in step S6f is YES.
When it is S, that is, when the IG switch is ON, it proceeds to step S6h to determine whether or not there is a change in an arbitrary switch input, and when this determination is ΝO, step S6i.
Proceed to. In step S6i, the data ID is set to 01 to enter the failure diagnosis mode (failure detection), and then the process returns to the main routine of FIG. The determination in step S6h is YE.
If S, that is, if there is a change in any switch input, the process proceeds to step S6j. In step S6j, the data ID is set to 01 to enter the failure diagnosis mode (switch diagnosis), and then the process returns to the main routine of FIG.

When the determination in step S6d is YES, that is, when the tester is connected to the diagnostic connector and an address is input within a predetermined time, the process proceeds to step S6k to determine whether the tester request is a failure diagnosis. If the determination in step S6k is ΝO, the process proceeds to step S6m to determine whether the tester request is forcible drive. If the determination in step S6m is ΝO, the process proceeds to step S6n to set the data ID to 00 and normal. After setting the operation mode, the process returns to the main routine of FIG. When the determination in step S6k is YES, that is, when the tester request is a failure diagnosis, the process proceeds to step S6p, the data ID is set to 01, and the failure diagnosis mode is set.
Return to When the determination in step S6m is YES, that is, when the tester request is forcible driving, the process proceeds to step S6q to set the data ID to 10 to enter the compulsory diagnosis mode, and then returns to FIG.

Control unit A1 to control unit F6 C
The PU 11 performs the process shown in FIG. 24 in the input / output (control) process of step S7 of the main routine. First, in step S7a, it is determined whether or not the data ID is the normal mode of 00, and if this determination is NO, it is determined in step S7b whether or not the failure diagnosis mode of the data ID is 01. When the determination is ΝO, the routine proceeds to step S7c, where it is determined whether or not the data ID is the communication command mode. When this determination is also ΝO, step S7d.
18 to perform error processing and then return to the main routine of FIG.

If the determination in step S7a is YES, that is, in the normal mode in which the data ID is 00, the flow advances to step S7e to process the input of various switches connected to the unit. Next, the process proceeds to step S7f to control the various loads connected to the unit, and further proceeds to step S7g to process the output of the various loads connected to the unit. Succeedingly, in the step S7h, the normal mode communication data of the unit is set, and then the process returns to the main routine of FIG.

When the determination in step S7b is YES, that is, when the data ID is 01 in the failure diagnosis mode, the process proceeds to step S7i to check the destination code of the unit. After that, the process proceeds to step S7j to check the failure of the sensor connected to the unit, and further to step S7k to check the blown fuse connected to the unit. Then, the process proceeds to step S7m to check if the connector associated with the unit is disconnected, and then to step S7n to check the switch input. And step S
After proceeding to 7p and setting the failure diagnosis mode communication data, the process returns to the main routine of FIG.

If the determination in step S7c is YES, that is, if the data ID is 10 in the communication command mode, the process proceeds to step S7q to process the forced load drive, and then to step S7r to set the communication command mode communication data. Returns to the main routine of FIG.

The CPU 11 of the control unit A1 performs the processing shown in FIG. 25 in the failure display processing of step S8 of the main routine. First, in step S8a, the data I
It is determined whether or not D is the failure diagnosis mode of 01. If this determination is ΝO, the process proceeds to step S8b and the data I
It is determined whether or not D is in the communication command mode of 10. If this determination is NO, the process proceeds to step S8c to perform normal display and then returns to the main routine of FIG. When the determination in step S8a is YES, that is, in the failure diagnosis mode, the process proceeds to step S8d to determine whether the diagnosis is the foreign matter detection mode, and when the determination is ΝO, the process proceeds to step S8e and the failure detection mode. If YES in step S8f, the process proceeds to step S8f to determine whether the switch diagnostic mode is in effect. If step S8f is NO, the process returns to the main routine of FIG.

When the determination in step S8d is YES and the foreign substance detection mode is in effect, the flow proceeds to step S8g, and the foreign substance detection is displayed as a pattern on the beam indicator in the meter. When the determination in step S8e is YES and the fault detection mode is selected. In step S8h, the failure detection is pattern-displayed on the beam indicator in the meter. If the determination in step S8f is YES and the switch diagnostic mode is selected, the process proceeds to step S8i to display the switch diagnostic on the beam indicator in the meter. In addition, the above step S8
When the determination in b is YES and the communication command mode is set, the process proceeds to step S8j and the forced lighting / extinguishment display is performed by the forced driving.

As is clear from the above description of the processing operation performed by the CPU 11 of the control unit A1 to the control unit F6 with reference to the flow charts of FIGS.
CPU11 of control unit A1-control unit F6,
Control means 11-for controlling the input of signals from the switches / sensors 13 _{1 to} 13 n, the loads 14 _{1 to} 14 n, etc. connected to the node 1 provided in the vehicle and the output of the signals to the loads.
As 1, the diagnostic means 11-2 checks items to be diagnosed at the time of diagnosis and generates diagnostic data based on the result. Also, the CP of the control unit A1
U11 is a diagnosis start control means for causing the diagnosis means to generate diagnosis data by a predetermined operation of a predetermined operation means 13x composed of a dimmer switch of the vehicle when the diagnosis terminal 9a is connected to the ground and the vehicle speed is 0 km / h. 11-3
As the output means 11-4, the generated diagnostic data is coded and output from the notification means 7a which is an existing beam indicator to the vehicle.

Further, the control unit A1 to the control unit F
The CPU 11 of 6 has switches and sensors 13 _{1 to} 13 n,
A plurality of nodes 1 to which loads 14 _{1 to} 14n are connected
Each of 4 checks the control data used by the control means 11-1 for controlling the input of signals from switches and sensors and the output of signals to the load, and the items to be diagnosed at the time of diagnosis. The transmission / reception unit 11-5 transmits and receives the diagnostic data generated by the diagnostic unit 11-2 that generates diagnostic data to another node via the multiplex bus line.

Further, the CPU 11 of the control unit A1 outputs diagnostic data concerning the presence or absence of a failure when the ignition switch 13y is on when starting the generation of diagnostic data by the diagnostic start control means, and diagnostic data concerning the specifications when the ignition switch is off. The output means 11-4 functions as the diagnosis selection means 11-6 to be output to the notification means 7a.

[0089]

As described above, according to the device of the present invention, the vehicle speed is 0 km after the diagnosis terminal is connected to the ground.
/ H is operated by operating a predetermined operation means of the vehicle, the diagnosis result of the check item is coded and output by the notification means already possessed by the vehicle. No need to connect a dedicated device, and even without a device for diagnosis, you can check for failures and destinations (specifications).
It is possible to obtain an effect that the diagnosis can be easily performed without performing a troublesome work for the diagnosis.

After connecting the diagnostic terminal of a specific node of the plurality of nodes to the ground, the vehicle speed is 0 km /
When h, the predetermined operation means of the vehicle is operated to encode the diagnostic result of the check item of the other node received from itself and via the multiplex bus line by the notifying means already possessed by the vehicle. Since it is configured to output, it is not necessary to separately connect a plurality of dedicated devices to diagnose a system having a plurality of nodes, and a plurality of electronic units (nodes) each having a multiplex communication function can be installed in the vehicle. In vehicle multiplex communication systems that are installed at various locations and interconnected by multiple bus lines, it becomes possible to check for failures and destinations (specifications) without the need for diagnostic equipment, which is troublesome for diagnosis. The effect that the diagnosis can be easily performed without performing work is obtained.

Further, the tokens are sequentially circulated between the respective nodes via the multiple bus lines to perform cyclic communication, whereby the diagnostic result of the check items of the other node received from itself and via the multiple bus lines. Can be collected in a specific node and can be intensively output by the existing notification means, so that no troublesome work is required.

Furthermore, a check item consisting of the specification of each node, each node itself, and the presence or absence of a failure such as a load connected to each node is selected according to the on / off state of the ignition switch when starting the generation of diagnostic data. Since it can be output as a result, it is possible to subdivide the content of the diagnosis and make it easy to understand.

Since a predetermined indicator lamp in the vehicle-mounted meter is caused to display a pattern corresponding to the code, the user can know the diagnostic result by sitting on the driver's seat and performing a predetermined operation to see the display section of the meter. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a simple diagnostic device in a vehicle system according to the present invention.

FIG. 2 is a block diagram showing a schematic configuration of an in-vehicle multiplex communication system to which the device of the present invention is applied.

FIG. 3 is a diagram showing a specific configuration example of a part of FIG.

4 is a diagram showing a character structure and a frame structure of data transmitted between nodes of the system of FIG.

5 is a diagram showing a basic sequence of communication performed between nodes of the system of FIG.

FIG. 6 is an explanatory diagram for explaining one cycle of communication performed between nodes of the system of FIG. 2 in a normal mode.

7 is an explanatory diagram for explaining one cycle of communication performed between nodes of the system of FIG. 2 in a diagnostic mode.

FIG. 8 is a diagram showing a data format of a control unit A in a normal mode, a failure diagnosis mode, and a communication command mode.

FIG. 9 is a diagram showing a data format of a control unit B in a normal mode and a failure diagnosis mode.

FIG. 10 is a diagram showing a data format of a control unit C in a normal mode and a failure diagnosis mode.

FIG. 11 is a diagram showing a data format in a normal mode and a failure diagnosis mode of the control unit D.

FIG. 12 is a diagram showing a data format in a normal mode and a failure diagnosis mode of the control unit E.

FIG. 13 is a diagram showing a data format in a failure diagnosis mode of the control unit F.

FIG. 14 is a state transition diagram illustrating a method of switching between the normal mode and the failure diagnosis mode.

FIG. 15 is a state transition diagram illustrating a diagnosis switching method in the simple failure diagnosis mode in FIG.

FIG. 16 is a diagram showing a pattern display example in which a diagnosis result is coded and output, and a normal time and a failure time are displayed.

FIG. 17 is a diagram showing a preferred example of a method for detecting connector disconnection.

FIG. 18 is a flowchart showing a main routine of a process performed by the CPU in FIG. 3 of the control unit A and other control units.

FIG. 19 is a flowchart showing a part of a reception interrupt process performed by the CPUs of control units A to F in FIG.

20 is a flowchart showing another part of the reception interrupt processing performed by the CPUs of control units A to F in FIG. 3. FIG.

FIG. 21 is a flowchart showing a transmission timer interrupt process performed by the CPU in FIG. 3 of the control unit.

22 is a flowchart showing a sleep transition timer interrupt process performed by the CPU in FIG. 3 of the control unit.

23 is a flowchart showing a mode switching process performed by the CPU in FIG. 3 of the control unit A. FIG.

24 is a flowchart showing an input / output (control) process performed by the CPU in FIG. 3 of the control unit.

25 is a flowchart showing a failure display process performed by the CPU in FIG. 3 of the control unit A. FIG.

FIG. 26 is a diagram showing a conventional failure diagnosis method.

[Explanation of symbols]

1 node (control unit A) 1 to 4 multiple nodes (control unit A,
Control unit B, control unit C, control unit D) B multiplex bus line 7 meter 7a notification means (beam indicator) 9a diagnostic terminal 11-1 control means (CPU) 11-2 diagnostic means (CPU) 11-3 diagnostic start control Means (CPU) 11-4 Output means (CPU) 11-5 Transmission / reception means (CPU) 11-6 Diagnostic selection means (CPU) 11b ₁ HALT information storage means (HALT)
Flag management area) 13 _{1 to} 13n Switches / sensors 13x Operating means (dimmer switch) 13y Ignition switch 14 _{1 to} 14n Load

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 8, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0077

[Correction method] Change

[Correction content]

In step S6d, it is determined whether or not the diagnosis by the fault diagnosis off-board device (tester) is started. This step S6d is judged by the diagnostic connector.
The tester is connected depending on whether or not an address is input from the tester within a predetermined time. If the address is not input within the predetermined time and the determination is NO, the process proceeds to step S6e. In step S6e, it is determined whether or not there is a simple diagnosis start operation by two reciprocating operations of the dimmer switch,
If this operation is not performed and the determination in step S6e is NO, the process returns to the main routine of FIG. 18 via step S6b.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiji Nakamura 206-1 Nunobikibara, Haibara-machi, Haibara-gun, Shizuoka Prefecture Yazaki Parts Co., Ltd.

Claims (5)

[Claims] 1. A control means for providing a node, to which switches, a sensor, a load, etc. are connected, in a vehicle, the node controlling input of a signal from the switches, the sensor, etc. and output of a signal to the load. And a diagnostic means for checking an item to be diagnosed at the time of diagnosis and generating diagnostic data based on the result, in the node, the diagnosis terminal is connected to ground and the vehicle speed is 0 km / h.
When a predetermined operation means of the vehicle is operated, the diagnosis start control means for causing the diagnosis means to generate the diagnosis data, and the diagnosis data generated by the diagnosis data generation means are coded from the existing notification means in the vehicle. A simple diagnostic device comprising an output means for outputting. 2. A plurality of nodes, each of which has a multiplex communication function and to which switches, sensors, loads, etc. are connected, are provided at various locations in a vehicle and are interconnected by multiple bus lines, and each node is a switch, Used by the control means, control means for controlling the input of signals from sensors and the like and the output of signals to the load, diagnostic means for checking items to be diagnosed at the time of diagnosis, and generating diagnostic data based on the results. In the vehicle system having a transmitting / receiving means for transmitting control data and diagnostic data generated by the diagnosing means to another node via the multiplex bus line and receiving from the other node, among the plurality of nodes, When the diagnosis terminal is connected to the ground and the vehicle speed is 0 km / h, the specific node of the above is operated by a predetermined operation means of the vehicle. Diagnostic start control means for causing the disconnecting means to generate the diagnostic data and for causing the diagnostic means of another node to generate the diagnostic data via the multiplex bus line; diagnostic data generated by the diagnostic data generating means of itself; A simple diagnostic device comprising: an output unit that encodes the diagnostic data generated by the diagnostic data generation unit of another node received by the transmission / reception unit and outputs the code from an existing notification unit of the vehicle. 3. The simple diagnosis device according to claim 2, wherein the vehicle system sequentially circulates the token between the nodes to perform cyclic communication. 4. The check item comprises the specification of each node, each node itself, and the presence or absence of a failure such as a load connected to each node, and the specific node causes the diagnostic start control means to generate diagnostic data. When the ignition switch is turned on when starting the diagnostic data regarding the presence or absence of the failure, when the ignition switch is off the diagnostic means for causing the output means to output the diagnostic data regarding the specifications, characterized by further comprising: Claim 2 or 3
The simple diagnostic device described in. 5. The simple diagnostic apparatus according to claim 1, wherein the notifying means comprises a predetermined indicator lamp in a vehicle-mounted meter to display a pattern corresponding to a code.