JP2839098B2 - Multiplex transmission equipment for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a multiplex system electrical component connected to a multiplex transmission line to which, for example, the CSMA / CD system is applied, and a non-multiplex system not passing through the multiplex communication transmission line The present invention relates to a vehicular multiplex transmission device used in a vehicle including an electrical component, and more particularly to an improvement in collection of fault diagnosis information on the electrical component.

(Prior Art) With the development of electronics in automobiles, the enlargement and complexity of wiring (wire harness) connecting electronic components has become a serious problem. In order to solve this problem, especially in the field of automobiles, multiplex communication has attracted attention. The multiplex communication is a method of transmitting a plurality of data in a time-division multiplex manner on one wiring, and is basically based on serial transmission (for example, Japanese Patent Application Laid-Open No. 62-4658).

In the field of automobiles, the network form of the multiplex communication is considered to be classified into a complete multiplex type and a partial multiplex type, or a centralized type and a distributed type. The partial multiplexing type is a mixture of a non-multiplexing communication part and a multiplex communication part. In the multiplex communication part, switches, loads, and the like, which are distributed in a distance, are connected by a multiplex transmission unit. It is said that individual wiring is required between the unit, switch and load, so that the total length of the wiring is reduced, but the number is increased. In the centralized type, the transmission unit of a plurality of slaves is connected to the transmission unit of one master. Although the diameter reduction effect can be obtained, if the master goes down, the system goes down. It is said that there are drawbacks such as difficulty. On the other hand, the dispersion type is costly, but has advantages such as a large diameter reduction effect, high reliability for partial down, and high flexibility for design change.

However, for example, signals used for electric components such as an engine fuel control controller, a shift control controller, or a suspension control device have a high response time, while electric components such as switches and display lamps have a relatively low speed. However, the former electrical component is independent of the multiplex communication transmission line mainly due to cost considerations.

(Problems to be Solved by the Invention) The increase in the number of electrical components requires not only an increase in the time required for inspections performed at service factories, but also a large amount of time especially for inspections when the production line is turned off. It became something to do. However, in a vehicle in which multiple electrical components and non-multiplex electrical components are mixed as described above,
Since the fault diagnosis signal used for multiplexed electrical components and that used for non-multiplexed electrical components are not compatible with each other, fault diagnosis is required separately for multiplexed electrical components and non-multiplexed electrical components. It has been in conflict with the shrinking time,
Centralized inspection is required.

By the way, in the case of vehicles, especially automobiles, the power supply status differs depending on the position of the engine key (OFF, ACC, ON). In the power supply state, it is desirable to perform the operation promptly and collectively. This is because it is inefficient to take the power of the failure diagnosis unit from outside, or if the power supply (+ B, ACC, IG) inside the vehicle is used, the electrical components should operate according to the power supply status. Because it is decided that it should not work,
The power supply must be changed every time the electrical component to be diagnosed changes, which may be an impossible situation.

Accordingly, the present invention has been made based on such a background, and an object of the present invention is to provide a vehicle in which non-multiplexed electrical components and multiplexed electrical components coexist in a vehicle in which non-multiplexed electrical components and multiplexed electrical components are mixed. It is an object of the present invention to propose a vehicular multiplex transmission device capable of performing both internal startup failure diagnosis and external startup failure diagnosis for both of the electrical components.

(Means and Actions for Solving the Problems) To achieve the above objects, the multiplex communication equipment and the multiplex communication equipment which are mutually dispersedly connected via a common multiplex communication transmission line according to claim 1. A multiplex communication device in a vehicle provided with a non-multiplexed electrical component that does not pass through a transmission line is supplied with at least power from a time when the operation of the vehicle is started to a time when the operation is stopped, and has a signal conversion function and a failure diagnosis function. A second multiplex system electrical component connected to the first multiplex system electrical component via the multiplex communication electrical path and transmitting failure diagnosis information to the multiplex communication transmission path; A non-multiplex system electrical component connected to the system electrical component via a non-multiplex communication transmission line and transmitting a failure signal to the non-multiplex communication transmission line; a multiplex branch line branched from the multiplex communication transmission line; Branched from communication transmission line A multi-branch line, and a connector for mounting an external diagnostic device, wherein the multi-branch line and the non-multi-branch line are configured such that the second multi-system electrical component and the non-multi-system electrical component are connected to the external diagnostic device. The first multiplex system electrical component is collectively connected to the connector so that the device can be diagnosed, and the first multiplex system electrical component is connected to the multiplex communication transmission line and the non-multiplex communication transmission line when the external diagnostic device is not connected. The second multi-system electrical component and the non-multi-system electrical component are diagnosed through the respective components.

(Operation) In the vehicular multiplex communication device configured as described above, the first multiplex system electrical component connected to both the multiplex communication transmission line and the non-multiplex communication transmission line stops operating from the start of operation of the vehicle. Until the time, at least power is supplied to ensure the internal self-diagnosis function. The first multiplex electrical component has a diagnostic function and a data conversion function between the first multiplex electrical component and the non-multiplex electrical component. Therefore, when the external diagnostic device is not connected, the first multiplex electrical component is disconnected from the multiplex communication transmission line. The second multiplex system electrical component and the non-multiplex system electrical component are respectively diagnosed via the multiplex communication transmission lines.

In addition, the multiplex branch line and the non-multiplex branch line are configured such that at least one of the first multiplex system electrical component, the second multiplex system electrical component, and the non-multiplex system electrical component can be diagnosed by the external diagnostic device. When the external diagnostic device is connected to the connector, the external diagnostic device is connected to the multiplex communication transmission line via the multiplex branch line and the non-multiplex branch line. Each of the non-multiplex communication transmission lines can be accessed.

(Embodiment) The principle configuration of an embodiment to which the present invention is applied will be described with reference to FIG. As shown in the figure, this principle configuration includes a multiplexed electrical component that is mutually dispersedly connected via a common multiplexed communication transmission line, and a non-multiplexed electrical component that does not pass through the multiplexed communication transmission line. A multiplex transmission device connected to the multiplex communication transmission line and a non-multiplex communication transmission line for transmitting a failure diagnosis signal for a non-multiplex system electrical component, wherein the multiplex transmission device is used when the vehicle is started. Power is supplied at least from the time when the vehicle stops operating.

Hereinafter, the present invention will be described with reference to the accompanying drawings in FIG.
An example in which the CSMA / CD system is applied to an automobile multiplex communication device using the PALNET system which is an improvement of the CSMA / CD system will be described. This PALNET method will be described later.

<Overall Configuration> FIG. 2A is an overall view showing the connections between the multiplex communication system electrical components and the non-multiplex system electrical components used in this embodiment. For simplicity, the number of multiplex communication system electrical components used in this embodiment is seven. Each multiplex communication system electrical component has a built-in communication control LSI therein as described later, and forms a node in terms of a network. These multiplex communication nodes are connected via a multiplex transmission path bus MB composed of a twisted pair line or the like. The seven multiplex communication nodes are a multiplex communication node CCS18 for electrical components for controlling display such as a navigation device and an audio device, a multiplex communication node MT21 for electrical components for meter control, and a multiplex communication for a mobile phone adapter. Node TEL17, multiplex communication node ACU16 for air conditioner control unit, multiplex communication node ACSW20 for air conditioner switch electrical components, multiplex communication node STSW15 for switch electrical components around steering wheel, and power supply for each node And a connection box multiplex communication node JB14 for connecting a device having a test function for self-diagnosis. The buzzer attached to the JB node 14 emits an alarm sound such as the start of failure diagnosis.

The switches around the steering connected to the electrical components of the STSW 15 include a turn light switch, a turn left switch, a small lamp switch, a horn switch, a headlamp high beam switch, and the meters include a turn light switch. Indicators, turn left indicators, and head dry high beam indicators are included.

As described above, the CCS node 18 is provided with a navigation unit (not shown). The CRT for displaying the navigation information is also used as a display of a diagnosis result in the failure diagnosis of the present embodiment. Also, MT
A three-digit LED display among various meters connected to the node 21 is also used for displaying a failure diagnosis result.

The power supply supplied to each multiplex electrical component will be described.
In this embodiment, the power supply is + B, AC
Three power supplies, C and IG (12V each), are prepared according to the position of the engine key. The power supplied to the multiplex electrical component is supplied in a manner that varies depending on the load to which the node is connected, the role of the switch, and the application. That is, JB node 1
4. Since the MT node 21 must always be supplied with power except when the engine key is removed, + B is always supplied. The node to which ACC power is supplied is T
The EL node 17, the CCS node 18, the STSW node 15, etc., to which the IG is supplied are the ACSW node 20, the ACU node 16.

It should be noted that only seven nodes are shown in FIG. 2A for the sake of simplicity of description, and more switches and loads may actually be connected. For example, a front multiplex communication node and a rear multiplex communication node are further provided, and the rear front multiplex communication node includes a front turn line signal lamp, a front turn left signal lamp, a front small lamp, a horn, and a rear multiplex communication node. In
A rear turn right signal lamp, a rear turn left signal lamp, a tail lamp, and the like may be included. Also, the connection between the node and each power supply is not limited to the connection relationship shown in FIG. 2A, and other connection relationships can be considered in consideration of operability, usability, and the like.

<Centralization of Wiring> The JB node 14 as a node in the network is connected to a transmission line MB1 for performing a failure diagnosis on the above seven multiplex nodes. Signal lines (TEST, FAIL described later) for performing failure diagnosis of non-multiplexed electrical components such as EGI10) are also connected. Thus, JB node 14 as a node
Since non-multiplexed signal lines are also concentrated as wiring in addition to the multiplex transmission line MB1, hereinafter, TWS ((T
otal wiring Unit) It will be called a unit.

The non-multiplexed electrical components of the embodiment shown in FIG.
In addition, there are a transmission controller 11 (ATC), an anti-lock brake controller 12 (ALBC), an automatic cruise controller 13 (ASC), and the like. Then, between the TWS unit and each of the non-multiplexed electrical components, a TE for transmitting a TEST signal for causing these non-multiplexed electrical components to start a self-diagnosis is provided.
It is connected by an ST signal line and a FAIL signal line for receiving the test result. This TEST signal line and FAIL
The signal lines and the transmission line MB1 are concentrated on terminals of a connector 24 provided in the vehicle. The centralized connector 24 is configured so that a connector of another device can be detached from the outside. For example, a connector of a wire cable of an off-board diagnostic device as shown in FIG. Can be connected to
This diagnostic device is a TEST signal line, FAIL signal line, transmission line MB1
It is possible to monitor the signal flowing above.

<Transmission Control in Multiplex System> In the multiplex transmission system for a vehicle according to this embodiment, vehicle operation information is transmitted between multiplex electrical components for each frame F having a configuration as shown in FIG. 3A. In this frame F, SD
(Start Delimiter) code, priority code,
The frame has a frame ID code, a data length, data 1 to data N, and a check code.

First, the “SD code” is a specific code indicating the start of the frame F, and the receiving multiplex communication node recognizes the start of the frame F when receiving the SD code code. The "priority code" is a code indicating a priority order indicating which signal is to be processed with priority when a plurality of multiplex communication nodes transmit data at the same time and a signal collides. When a collision of a plurality of data occurs, data having a higher priority is processed first. "Frame ID code"
Is a code for identifying what data is allocated to each bit of the data area. Frame F
Is a code indicating the combination of the data in the data area. The receiving multiplex communication node can know the contents of the data in the data area of the frame F from the frame ID code. In the “data length”, the number of data following this is written. If there are N data, the data length is set to N.
Is sent. The multiplex communication node that has received this frame reads only the data of the data length. The field following the data is a CRC check code (error detection code). By confirming this, it is possible to know that the end of the frame has been reached.

The data area is of variable length. As an example, a frame for causing the TWS unit 14 to perform a failure diagnosis on a multiplex system node has a data length of 8 digits and is $ 70, $ 00, $ 8U, $ FF. Here, U is the node unit number to be tested.

Further, the acknowledgment signal area (ACK field) shown in FIG. 3A will be described. This ACK field is the PALNE
T is proposed by the present applicant in Japanese Patent Application No. 62-62. This field contains multiple bits, for example,
Each multiplex communication node is composed of 16 bits, and a predetermined bit area is allocated to the multiplex communication node. Each node confirms normal reception based on each bit of the ACK field. That is, the transmitting node sets only the bit at the position corresponding to the own node in the 16-bit ACK field to "0", and sets all other bits to "1".
That is, one "0" and fifteen "1" bits are provided to the transmission path with a predetermined gap following the transmission frame. The receiving multiplex communication node checks whether there is an error in the content of the frame received by the check code, and if there is no error, a reception confirmation unique to each multiplex communication node is placed in a bit area at a predetermined position for each multiplex communication node. The signal (ACK signal) is returned to the transmission multiplex communication node as "0". That is, the node whose ACK field is "0" indicates that the frame has been normally received.

FIG. 4 shows the positions of ACK bits assigned to each of the seven nodes in the embodiment of FIG. 2A. Note that this allocation position may be an arbitrary position as long as it is determined in advance. Note that, in the same figure, since no node exists in the bit position after the CCS 18 in the embodiment shown in FIG. 2A, it is all "1".

FIGS. 5A to 5C show the AC that would be returned if the active nodes in each power state were each normal if the ACK bit allocation according to FIG. 4 was followed.
The K bit is shown.

FIG. 5A shows that an ACK from the JB node 14 and the MT node 21 should be returned in the + B state at the stage when the engine key is inserted. FIG. 5B shows that ACK should be returned from each of the five nodes JB14, MT21, STSW15, TEL17, and CCS18 when the power supply is in the ACC state. FIG. 5C shows that ACK should be returned from all seven nodes.
That is, as described above, the transmitting node sends an ACK
Since all 15 bits except the bit allocated for the confidence of the field are set to "1", in each power state, the node which is not active naturally has
Since no ACK is returned, the corresponding bit remains "1". The active node returns “0” as ACK.

Therefore, the ACK pattern in each power supply state is stored in advance in a ROM or the like as a table, and the ACK pattern in each power supply state actually received (this pattern is referred to as a “received ACK pattern”) and the table (stored in this table) The ACK bit of the node that should be active is correctly “0”, or the ACK bit of the node that should be inactive is correctly “1”. By examining whether it is "", good / bad of each node can be accurately determined according to each power supply state. The “registered ACK pattern” is “0011111” and “11111111” in the + B state, “0010100” and “11111111” in the ACC state, and “0000000” and “11111111” in the IG state.

The TWS unit 14 (JB node 14) performs network management by comparing and comparing the registered ACK pattern with the received ACK pattern, and performs fault diagnosis using the result of the comparison and matching. This is because the TWS unit 14 concentrates all the wires as described above, so it is suitable for monitoring the signal line, and the power is always supplied through the + B, ACC, and IG power states. The reason is that failure diagnosis can be performed at all times.

Incidentally, if any node is selected as a unit for failure diagnosis from the viewpoint of simply enabling failure diagnosis at all times, the meter MT node 21 is also possible in the embodiment of FIG. 2A.

FIG. 6 shows a schematic configuration of a multiplex communication controller 100 commonly used in each node of FIG. 2A.

In the sixth, reference numeral 1 denotes an MB1 which is a transmission line shown in FIG. 2A, and reference numeral 2 denotes a connector for connecting the multiplex communication controller 100 and the MB1. 3 is a multiplex interface module, and 8 is a host CPU. Multiple I / F module 3, carrier detection / collision detection on MB1, further, reads the serial data from MB1, performs conversion or the like into parallel data (D ₇ ~D _0). Further, between the host CPU 8, reading ivy 8 bits sent to and from the host CPU 8 of the parallel data (D ₇ ~D _0), Nikki by Tsukasa conversion like to serial data parallel data from the CPU 8. In addition, it checks the vertical parity, calculates an error detection code, and the like. That is, it controls the physical layer level in the network. Host CP
U8 and actual switches and loads (not shown)
7, are connected via input and output interface circuits 4,5.

<Outline of Fault Diagnosis> FIG. 2B is a simplified representation of the system of the embodiment shown in FIG. 2A. In the figure, AUTO (OFF) of the ACSW 20 is a switch for instructing to automatically perform (stop) the air conditioner control. In addition, NAVI of the CCS node 18 is a switch for starting the navigation function and displaying the navigation information on the attached CRT, and the TV is for providing the CRT attached to the navigation device to a normal television broadcast monitor. It is a switch.

The failure diagnosis according to the present embodiment includes a failure diagnosis based on a start inside the vehicle and a failure diagnosis based on a start outside the vehicle. The failure diagnosis of internal startup is to check that the operator has performed a predetermined operation.
Triggered by the detection of TWS unit 14, this TWS
The unit 14 executes a predetermined diagnostic procedure according to its own internal program while taking an initiative for another node. On the other hand, failure diagnosis of external start
When the off-board diagnostic device 22 is connected to 24, the "external" signal to the TWS unit 14 becomes "1", and as a result,
The TWS unit 14 is simply a node, and thereafter, the off-board diagnostic device 22 takes the initiative and executes a failure diagnosis test on non-multiplexed electrical components and multiplexed electrical components according to its internal program or the operation of the operator. I do.

The failure diagnosis provided in the electric component system of this embodiment includes: a case where the: TWS unit 14 performs non-multiplexed electric components using the above-described TEST signal and FAIL signal; Sends the above-mentioned test start frame to each multiplexed electrical component, thereby causing each multiplexed electrical component to perform a self-test.
Receiving the test result sent as a frame, receiving the ACK during the frame transmission / reception process, and monitoring the waveform of the signal on MB1 for abnormalities in the frame transmission / reception process. Finding a bad node (multiple electrical components) by comparing the pattern with the registered ACK pattern.

The TWS unit 14 performs these failure diagnosis functions independently in the failure diagnosis of internal startup. Also,
In the failure diagnosis of external start, the off-board diagnostic device 22
May cause the TWS unit 14 to execute the above-mentioned functions, or the off-hod diagnostic device 22 may perform the function independently and independently of the TWS unit 4 according to the operation of the operator.

<Configuration of TWS Unit 14> FIG. 7 is a diagram showing the internal configuration of the TWS unit 14.
FIG. 6 is a diagram for explaining in detail the multiplex interface module 3 and the CPU 8 in the general node shown in FIG. The signal from the transmission line MB1 is sent to the multiplex signal processing circuit 30.
, Where CRC check, PWM processing, etc. are performed. M
The signal on B1 is monitored by the multiple abnormality detection circuit unit 31. As shown in FIG. 8, the circuit 31 detects a peak value of a difference between signals on two twisted pair lines by a peak detector 40 and samples and holds the detected value by a hold circuit 41. This peak value is compared with a predetermined threshold value, and if it is lower than this threshold value, it is sent to the CPU 8 of the TWS unit 14 as an interrupt signal.

The centralized connector 24I /
O processing unit 37 receives a signal from the On-Vehicle signal processing unit 33 and a signal from the multiplexed signal processing circuit unit 30, determines whether an external diagnosis request or an internal diagnosis request is required, and responds to the determination result. Then, the failure diagnosis processing unit 36 is started.

<Internal Start-Up Failure Diagnosis> The predetermined operation that triggers the start-up of the internal start-up failure diagnosis described above can be variously considered.In this embodiment, the operation is to press the AUTO switch and the OFF switch shown in FIG. 2B at the same time. , NAVI switch and TV switch are pressed simultaneously.

FIG. 9 is a diagram for explaining the sequence of the internal startup failure diagnosis. Upon detecting the above operation, the CCS node 18 sends a frame indicating this to the JB node 14 (FIG. 9). JB node 14 (TWS unit 1) receiving this frame
In 4), first, diagnosis of non-multiplex electrical components is started. This diagnosis can be performed for the non-multiplex system electrical components collectively or individually, but FIG. 9 shows a case where the diagnosis is performed sequentially. That is, from EGI10 to ASC13,
In order, the TEST signal is set to “0” and the FAIL signal is read. The read non-multiplexed FAIL signal is converted into a multiplexed signal in the TWS unit 14 (FIG. 9) and sent to the MT node 21 (FIG. 9).

Next, the TWS unit 14 starts the test of the multiplex node (FIG. 9). First, one multiple node (multiple electrical components)
A test start instruction frame. The node sends a service code frame to the MT node 21.
The MT node 21 receiving this frame displays it on a three-digit display. The node under test sends the frame to the MT node 21 as long as there is a service code to be sent to the MT node 21, and sends an end frame to the TWS unit 14 (JB code 14) when there is no more to send. send. Then, the TWS unit 14 sends a test start instruction frame to the next node.

<Control Procedure in TWS Unit> FIG. 10 schematically shows a control procedure in the TWS unit 14.

After waiting for the + B power supply to be turned on, in step S1, the TWS unit 14 itself is initialized. In step S2, it is checked whether or not there is a diagnostic activation from outside. If there is no external activation, the process proceeds to step S4 to check whether there is any internal activation from the CCS node 18. If there is no internal start, in step S6
Perform the normal processing imposed on the TWS unit 14. That is, in the normal operation state, if a frame is received from another multiplex node, the frame is processed, and if a frame is transmitted to a plurality of multiplex nodes, the frame is transmitted to the node.

If there is internal startup from CCS node 18, step S8
Then, the fault diagnosis described with reference to FIG. 9 is performed.

If there is an external activation, the process waits for an instruction from the off-board diagnostic device 22 in step S10. If there is an instruction, it is checked in step S12 whether the instruction is a termination instruction for external diagnosis. If not, the instruction is executed in step S14.

<Effects of Embodiment> According to the above-described embodiment, TWS can be performed regardless of the multiplex electrical component and the non-multiplex electrical component.
The unit can collectively read the failure information collectively.

: Since power is supplied to this TWS unit at all times, the failure diagnosis can be performed consistently by the TWS unit regardless of the state of activity of the electrical components depending on the driving state of the car. At the same time, since signal lines from multiple electrical components and non-multiple electrical components are collectively concentrated in the TWS unit, the time required for inspection when a line is turned off from a service factory or a production line is reduced.

: Non-multiplex system failure information is also converted to multiplex system information,
Since the information is displayed on the meter of the multiplex MT node or the CRT of the CCS node, the display of the failure information can be unified.

: Since failure information from non-multiplexed and multiplexed electrical components can be collectively accessed from outside via a centralized connector, diagnosis from outside is possible.

: Even if the multiplex system fails, the TWS unit having the multiplex system failure detection function can be externally accessed, so that the failure site of the multiplex network can be quickly identified.

: In the case of internal startup diagnosis, the TWS unit needs to have a memory for each node unit in order to issue a failure diagnosis instruction, and a centralized memory for centralized diagnosis is not required.

<Modification> In the above-described embodiment, the report of the abnormal state is reported by a display on the meter or the CRT. However, an alarm may be sounded or printed on a printer of the TWS unit.

: The off-board fault diagnostic device can access all of the MB1, TEST, and FAIL lines, but the off-board fault diagnostic device converts all access to non-multiplex electrical components to multiplex signals. The conversion may be performed using the converted signal.

In the above embodiment, the CSMA / CD system is applied. However, the present invention can be applied to any communication system, such as a token system, as long as multiplex communication is performed.

(Effects of the Invention) As described above, the present invention includes the multiplex system electrical components which are mutually dispersedly connected via the common multiplex communication transmission line and the non-multiplex system electrical components which do not pass through the multiplex communication transmission line. A multiplex communication device in a vehicle, to which power is supplied at least from the start of operation of the vehicle to the stop of operation of the vehicle, a first multiplex system electric component having a signal conversion function and a failure diagnosis function, A second product which is connected to the product via the multiplex communication transmission line and transmits failure diagnosis information to the multiplex communication transmission line.
A multiplexed electrical component, a non-multiplexed electrical component connected to the first multiplexed electrical component via a non-multiplexed communication transmission line, and transmitting a failure signal to the non-multiplexed communication transmission line; A multiplexed branch line, a non-multiplexed branch line branched from the non-multiplexed communication transmission line, and a connector for mounting an external diagnostic device, wherein the multiplexed branch line and the non-multiplexed branch line are The two-multiplex electrical component and the non-multiplex electrical component are collectively connected to the connector so that diagnosis can be performed by the external diagnostic device.
When the external diagnostic device is not connected, the second multiplex system electrical component and the non-multiplex system electrical component are diagnosed via the multiplex communication transmission line and the non-multiplex communication transmission line, respectively. I do.

According to the multiplex communication apparatus having the above configuration, the first multiplex system electrical component connected to both the multiplex communication transmission line and the non-multiplex communication transmission line includes at least a portion from the time when the vehicle starts operating to the time when the vehicle stops operating. Power is supplied to ensure the internal self-diagnosis function. The first multiplex electrical component has a diagnostic function and a data conversion function between the first multiplex electrical component and the non-multiplex electrical component. Therefore, when the external diagnostic device is not connected, the first multiplex electrical component is disconnected from the multiplex communication transmission line. The second through a multiplex communication transmission path, respectively.
The multiplex electrical component and the non-multiplex electrical component can be diagnosed.

In addition, the multiplex branch line and the non-multiplex branch line are configured such that at least one of the first multiplex system electrical component, the second multiplex system electrical component, and the non-multiplex system electrical component can be diagnosed by the external diagnostic device. When the external diagnostic device is connected to the connector, the external diagnostic device is connected to the multiplex communication transmission line via the multiplex branch line and the non-multiplex branch line. In the non-multiplex communication transmission path,
Each will be accessible.

Therefore, when the multiplex communication device of the present invention is applied to a vehicle in which non-multiplex electrical components and multiplex electrical components coexist, both the non-multiplex electrical components and the multiplex electrical components are connected to the respective lines. Through this, it is possible to perform the fault diagnosis by either the internally started fault diagnosis or the externally started fault diagnosis.

According to the apparatus of claim 2, the first multiplex electrical component is:
A failure diagnosis start signal is transmitted to the second multiplex system electrical component via the multiplex communication transmission line, and a failure diagnosis start signal is transmitted to the non-multiplex system electric component via the non-multiplex communication transmission line.

According to the device of claim 3, a signal line for notifying that the diagnostic device has been connected to the connector is provided between the first multiplex electrical component and the connector. I do. From this notification signal, the first multiplex electrical component knows that the external diagnostic device has been connected.

According to the apparatus of claim 4, the first multiplex electrical component includes:
Since the failure signal transmitted from the non-multiplex system electrical component is converted to be suitable for the multiplex communication transmission line, the failure information can be collectively managed by the multiplex system signal.

According to the device of the fifth aspect, when the external diagnostic device is mounted, the failure diagnosis of the non-multiplexed electric component is performed via the non-multiplexed communication transmission line without passing through the first multiplexed electric component. be able to.

According to the apparatus of claim 6, the multiplex communication transmission line directly connects the first multiplex system electric component and the second multiplex system electric component, and the non-multiplex communication transmission line connects the first multiplex system electric component and the non-multiplex system electric device. Since the components are directly connected to each other, the first multiplex electrical component can directly access each of the second multiplex electrical component and the non-multiplex electrical component.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of the present invention, FIG. 2A is a diagram for explaining a network of a multiplex transmission apparatus according to a first embodiment of the present invention, and FIG. FIG. 3 is a diagram showing the format of a frame used in the embodiment. FIG. 4 is a diagram showing the bit configuration assigned to the ACK field for each node. FIGS. 5A to 5C are diagrams according to each power supply state. Received ACK at normal
FIG. 6 is a diagram for explaining a pattern, FIG. 6 is a diagram showing a hardware configuration of a node used in the embodiment, FIG. 7 is a diagram showing a configuration of a TWS unit, FIG. 8 is a circuit diagram for performing waveform monitoring, FIG. 9 is a diagram for explaining a failure diagnosis procedure for starting the vehicle, and FIG. 10 is a flowchart relating to the failure diagnosis procedure in the TWS unit. In the drawing, 1... Multiplex transmission line MB, 2... Connector, 3... Multiple interface module (LSI), 4... Input interface circuit, 5.
... input signal line, 7 ... output signal line, 8 ... host CPU, 1
00 ... a multiplex communication controller.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04L 29/14 H04L 11/00 320 (72) Inventor Yusaku Hinoki 5-9-1, Higashiyawata, Hiratsuka-shi, Kanagawa Furukawa Electric Co., Ltd. Inside the Hiratsuka Plant (72) Inventor Osamu Dohei 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Toshimichi Tokunaga 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Yoshinobu Harada 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) References JP-A-62-3540 (JP, A) JP-A-63-243832 (JP, A JP-A-62-111543 (JP, A) JP-A-62-4658 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04Q 9/00-9/16 B60R 16 / 02

Claims (6)

(57) [Claims] 1. A vehicle comprising: a multi-system electrical component which is mutually dispersedly connected via a common multiplex communication transmission line; and a non-multi-system electrical component which does not pass through said multiplex communication transmission line. Power is supplied at least during the period from to when the operation is stopped, a first multiplex system electrical component having a signal conversion function and a failure diagnosis function, and connected to the first multiplex system electrical component via the multiplex communication transmission path, A second multiplex system electrical component for transmitting failure diagnostic information to the multiplex communication transmission line; a second multiplex system electrical component connected to the first multiplex system electrical component via a non-multiplex communication transmission line to transmit a failure signal to the non-multiplex communication transmission line A non-multiplexed electrical component, a multi-branch line branched from the multiplex communication transmission line, a non-multiplex branch line branched from the non-multiplex communication transmission line, and a connector for mounting an external diagnostic device, The multiple branch line and the non-multiplex The branch line is collectively connected to the connector so that the second multi-system electrical component and the non-multi-system electrical component can be diagnosed by the external diagnostic device. When the external diagnostic device is not connected, the second multiplex system electrical component and the non-multiplex system electrical component are diagnosed via the multiplex communication transmission line and the non-multiplex communication transmission line, respectively. Multiplex transmission device for vehicles. 2. The first multiplex system electrical component transmits a failure diagnosis start signal to the second multiplex system electrical component via the multiplex communication transmission line, and transmits the non-multiplex system electrical component to the non-multiplex system electrical component. The multiplex transmission apparatus for a vehicle according to claim 1, wherein the failure diagnosis start signal is transmitted via a transmission path. 3. A signal line for notifying that the diagnostic device has been connected to the connector is provided between the first multiplex electrical component and the connector. 2. The multiplex transmission device for a vehicle according to claim 1. 4. The vehicle according to claim 1, wherein the first multiplex system electrical component converts a failure signal transmitted from the non-multiplex system electrical component and transmits the failure signal to the multiplex communication transmission line. Multiplex transmission equipment. 5. When the external diagnostic device is mounted,
2. The vehicle according to claim 1, wherein the external diagnostic device diagnoses the non-multiplexed electrical component via the non-multiplexed communication transmission line without passing through the first multiplexed electrical component. 3. Multiplex transmission equipment. 6. The multiplex communication transmission line directly connects the first multiplex system electrical component and the second multiplex system electrical component, and the non-multiplex communication transmission line connects the first multiplex system electrical component to the non-multiplex system electrical component. The multiplex transmission device for a vehicle according to claim 1, wherein the multiplex transmission device is directly connected to a product.