JPH06351072A - Multiplex transmitting device - Google Patents

Abstract

PURPOSE:To set up an operation controlled part on the receiving node part side to a state capable of protecting occupants, safety from adverse effects even when a fault is generated in a signal transmission line at the time of transmitting digital control information in a vehicle from a transmitting node part to a receiving node part through a communication line. CONSTITUTION:This multiplex transmitting device is provided with a transmitting node part 12A for sending digital control information including checking information at the time of obtaining a prescribed bit pattern, a bidirectional communication line 11 for transmitting the digital control information from the node part 12A and a receiving node part 12D for entering the digital control information from the line 11. When the checking information maintains a prescribed bit pattern even if abnormality is generated in an information transmitting route, control operation corresponding to the digital control information inputted to the node part 12D is set up as a result generating scheduled malfunction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication line for multiplex transmission of a plurality of types of digital control information, sending digital control information to the communication line, taking in digital control information from the communication line, or digital control information. The present invention relates to a multiplex transmission device configured by connecting a plurality of node units for transmitting the digital control information to the communication line and taking in digital control information from the communication line.

[0002]

2. Description of the Related Art In recent years, with the increase in the number of electrical components or control systems installed in vehicles and the progress of computerization in various electrical components or control systems, wiring, connectors, and The number of electronic control units has increased remarkably, resulting in an increase in the size and weight of the wire harness attached to the vehicle body. And the larger scale of wire harness is
In addition to limiting the space for mounting the harness to the vehicle body, the flexibility of the wire harness is reduced, leading to a reduction in the efficiency of assembly work.
An increase in the weight of the wire harness directly leads to an increase in the weight of the vehicle.

Therefore, in order to reduce the number of wirings, connectors and electronic control units in a vehicle, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent No. 16845, a common communication line that multiplex-transmits a plurality of types of control information for performing operation control for various electric components and control systems mounted on a vehicle is provided. , The communication line is connected to a plurality of node units that send out control information or take in control information, and various electrical components and control systems installed in the vehicle are appropriately connected to the plurality of node units. It has been proposed to construct a multiplex communication mechanism in a vehicle.

In a multiplex communication mechanism constructed in such a vehicle, for example, a communication line through which multiplexed control information is transmitted by a signal transmission line formed by a wire harness arranged on a vehicle body. Each of the plurality of node units connected to the communication line is provided with a signal generation unit such as various sensors and switches, and a controlled unit such as various actuators and motors provided in each unit of the vehicle. Are grouped and connected. The node unit to which the signal generating unit and the operated control unit are connected is, for example, the multiplex communication unit connected to the communication line, the input / output connected to the signal generating unit and the operated control unit, etc. The control information is configured based on a signal from the signal generation unit, which includes a processing unit and an arithmetic control unit that is interposed between the multiplex communication unit and the input / output processing unit and includes, for example, a microcomputer. And the control information selected from the communication line is taken in to form an operation control signal based on the received control information, and the operation control signal connected thereto is formed. It is assumed that an operation state in which the operation is supplied to the unit to control the operation is selectively taken. The control information provided for multiplex transmission by the communication line is, for example, digital control information represented by a pulse code modulation (PCM) signal, and non-return-to-zero (NRZ) modulation is used for transmission. In the form of an NRZ-modulated carrier signal.

[0005]

As described above, a plurality of node units for transmitting digital control information or capturing digital control information to a communication line in a vehicle, or for transmitting digital control information and capturing digital control information. In a multiplex communication mechanism constructed by connecting a plurality of nodes, the transmission of digital information between a plurality of node units forms digital control information based on a signal from a signal generating unit, and the digital control information is transmitted to a communication line. From the node unit (transmission node unit) which is assumed to be in the operating state for transmission, the digital control information transmitted by the transmission node unit is taken in from the communication line, and an operation control signal based on the taken digital control information is formed, A node unit that takes an operating state that supplies it to the connected controlled unit and controls its operation ( It will be done with the information transmission in the form of the signal node section).

In this case, a signal transmission line between the arithmetic and control unit in the transmission node unit and the multiplex communication unit and a communication line between the multiplex communication unit in the transmission node unit and the multiplex communication unit in the reception node unit are configured. When a failure such as a partial disconnection accident or a short-circuit accident occurs in any of the signal transmission line and the signal transmission line between the multiplex communication unit and the arithmetic and control unit in the reception node unit, the reception node unit The digital control information formed by the arithmetic control unit in the transmitting node section is not supplied to the arithmetic and control unit in the above in a proper form, and as a result, the digital control information in the receiving node section is incorrect. The operation control signal based on the above is formed, and improper operation control for the operated control section connected to the receiving node section is performed. Become dividing.

Then, when a situation occurs in which the operation control unit in the receiving node section performs improper operation control on the operated control section in accordance with the operation control signal formed based on improper digital control information, Depending on the type, the operated control unit may be subjected to an undesired operation control that may adversely affect the safety of the vehicle occupant.

In view of the above point, the present invention comprises a plurality of node units, each of which has a built-in multiplex communication unit and an arithmetic control unit, connected to a communication line installed in a vehicle. When the transmission node unit and the reception node unit are set in the node unit and the digital control information is transmitted from the transmission node unit to the reception node unit through the communication line, the transmission node unit Even when a failure occurs in the signal transmission path from the arithmetic and control unit in the transmitting node unit to the arithmetic and control unit in the receiving node unit via the multiplex communication unit and the communication line in the transmitting node unit, the multiplex communication unit in the receiving node unit, etc. Undesired operation that causes the controlled part connected to the vehicle to be in a state that adversely affects the safety of the vehicle occupant regardless of the type. And to provide a multiplex transmission apparatus which can be made to those not subject to control.

[0009]

In order to achieve the above object, a multiplex transmission apparatus according to the present invention is connected to a communication line on which multiple types of digital control information are multiplex-transmitted, and is set in advance. A first control unit in an operating state for forming digital control information including check information having a bit pattern, and an operating state in which the control information formed by the first control unit is sent to a communication line It includes a first communication unit that has a built-in first communication unit and can be a transmission node unit, and includes check information that is connected to the communication line and is sent from the first node unit to the communication line. A second communication unit that is in an operational state that captures digital control information, and is supplied with digital control information that includes the check information captured by the second communication unit, When the check information included in the captured digital control information of the above maintains the preset bit pattern, the control operation according to the captured digital control information is executed, and the captured digital control information is also executed. When the check information contained in the check information does not maintain a preset bit pattern, a second control unit that takes an operation state to stop the execution of the control operation according to the fetched digital control information is built-in and received. A first control unit, which includes a second node unit that can be a node unit and is incorporated in the first node unit, sends the check information to the first control unit via a communication line via a communication line. When the preset bit pattern is maintained even when the information transmission path leading to the second control unit is abnormal, Control operation according to the digital control information captured executed by the second control unit is intended to produce a result that is to be a malfunction, which is scheduled, constructed.

[0010]

In the multiplex transmission apparatus according to the present invention configured as described above, the first node unit serves as the transmitting node unit and the second node unit serves as the receiving node unit. The digital control information formed by the first control unit is transmitted to the communication line through the first communication unit, and the digital control information is transmitted from the communication line to the second communication unit through the second communication unit.
The information transmitted to the control unit is transmitted. Then, in the second node unit that is the receiving node unit,
When the bit pattern of the checking information included in the fetched digital control information is detected and the bit pattern of the checking information is a bit pattern preset in the first control unit, for example, fetching at that time is performed. An operation control signal based on the digital control information is generated, thereby controlling the operated control section connected to the second node section, and according to the digital control information fetched by the second control unit. The controlled operation is executed.

Further, as a result of detection of the bit pattern of the checking information included in the digital control information fetched by the second node unit, the bit pattern of the checking information is preset in the first control unit. If the bit pattern is different from the
From the control unit of the first communication unit, the communication line and the second
There is a possibility that the digital transmission information taken in by the second node unit is not proper because some trouble has occurred in the information transmission path that reaches the second control unit via the communication unit of the second control unit. Therefore, in such a case, for example, the operation control signal is not formed based on the digital control information fetched at that time by the second control unit.
Execution of the control operation according to the digital control information fetched by the second control unit is stopped.

Then, as described above, as a result of the detection of the bit pattern of the check information included in the digital control information fetched in the second node unit, the bit pattern of the check information is the first control unit. In the state where the bit pattern is set in advance, there is no failure in the information transmission path from the first control unit to the second control unit via the first communication unit, the communication line and the second communication unit. In the case where the information transmission path from the first control unit to the second control unit via the first communication unit, the communication line and the second communication unit is not only damaged, There is a possibility that you can get it. Therefore, in the multiplex transmission device according to the present invention, the first control unit sends the check information to the first control unit via the first communication unit, the communication line, and the second communication unit. The digital control which is executed by the second control unit when the preset bit pattern is to be maintained even when the information transmission path leading to the second control unit is damaged. The control operation according to the information is set, for example, such that the operated control section connected to the second node section is placed in a state in which the safety of the occupant of the vehicle is not adversely affected regardless of its type. It is assumed that this is a malfunction.

As described above, according to the multiplex transmission apparatus of the present invention, the first node unit serves as the transmitting node unit and the second node unit serves as the receiving node unit.
The digital control information formed by the first control unit is sent to the communication line through the first communication unit, and the information transmission from the communication line to the second control unit through the second communication unit is performed. When a failure occurs in the information transmission path from the first control unit to the second control unit via the first communication unit, the communication line and the second communication unit, the information is taken in by the second control unit. The state in which the execution of the control operation according to the digital control information is stopped, or the control operation according to the captured digital control information executed by the second control unit is connected to, for example, the second node unit. It is assumed that the operated control unit is placed in a state where it does not adversely affect the safety of the vehicle occupant, and the state in which the scheduled malfunction occurs. It is. Therefore, even if the information transmission path from the first control unit to the second control unit via the first communication section, the communication line, and the second communication section has a failure, the target connected to the receiving node section is affected. Regardless of the type, the operation control unit is not subjected to undesired operation control that is in a state that adversely affects the safety of the vehicle occupant.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a multiplex transmission apparatus according to the present invention as applied to a vehicle.

In the example shown in FIG. 1, a plurality of node units 12A, 12 are installed in a bidirectional communication line 11 installed in a vehicle body for multiplex transmission of a plurality of types of digital control information.
B, 12C and 12D are connected. Node part 12
A is a multiplex communication unit 14 in which a communication input / output terminal is connected to a bidirectional communication line 11 through a bidirectional service line 13.
And an arithmetic control unit 16 connected to the multiplex communication unit 14 via a data bus 15 and an input / output processing unit 18 connected to the arithmetic control unit 16 via a data bus 17. A right door power window (right door P / W) device 19 which is an operated control part in the vehicle is connected to an input / output terminal of the input / output processing part 18, and a left door which is a signal generating part in the vehicle is connected. A power window (left door P / W) switch 20 and a right door P / W switch 21 are connected.

The node unit 12D is connected to the bidirectional communication line 11 through the bidirectional service line 13 and the communication input / output terminal 24 is connected to the multiplex communication unit 24. Control unit 26
And an input / output processing unit 28 connected to the arithmetic and control unit 26 via a data bus 27. The input / output terminal of the input / output processing unit 28 is connected to the left door P / W device 29 which is a controlled unit in the vehicle, and the left door P / W switch 30 which is a signal generating unit in the vehicle. It is connected. Further, although not shown in the drawings, each of the node unit 12B and the node unit 12C is similar to the node unit 12A or the node unit 12D, but the bidirectional communication line 11 and the bidirectional pull-in line 13 are the same.
A multiplex communication unit to which a communication input / output terminal is connected through,
The multiplex communication unit is connected to the data control unit via a data bus, and the input / output processing unit connected to the calculation control unit via the data bus is built in. The operated control section or the signal generating section arranged is connected.

Node units 12A, 12B, 12C and 12
Each D includes a battery mounted on the vehicle, an AC generator driven by an engine mounted on the vehicle, and a rectifier that rectifies the generated output from the AC generator to obtain a DC voltage. It is connected to a load power supply line 31 derived from a DC voltage supply section formed by a rectification section. The load power supply line 31 supplies a stabilized DC voltage VB of, for example, 5 volts to the node units 12A, 12B, 12C and 12D as a power supply voltage.

As described above, the bidirectional communication line 11 and the node unit 12 connected to the bidirectional communication line 13 are connected.
In an example of the multiplex transmission apparatus according to the present invention configured to include A, 12B, 12C and 12D, multiplex transmission is performed through the bidirectional communication line 11 accompanied by a plurality of bidirectional service lines 13. Each of the digital control information,
For example, it is transmitted as a data frame unit. The data frame unit of such digital control information is, for example, a group of code data having a predetermined total number of bits, for example, 85 bits as shown in FIG. Start marker SOM, data PR representing the priority of 8-bit structure, data ID representing the type of information each composed of 8 bits, data DT3, DT2, DT1 and DT0 representing the information to be transmitted, 8-bit structure Error correction data CRC, 1-bit data end flag EOD, 8-bit information reception confirmation data ANC2, ANC1, and ANC0, and 2-bit end marker EOM. It

As mentioned above, a plurality of bidirectional service lines 1
Each of the digital control information to be multiplexed and transmitted through the bidirectional communication line 11 with 3 is mainly formed of code data of 8 bits.
In each of the node units 12A, 12B, 12C and 12D, the data bus (15, 25) between the multiplex communication unit (14, 24) and the arithmetic control unit (16, 26) is
For example, as shown in FIG. 3, the control data bus CB and eight information bit transmission lines CL0, ...
・ CL5, CL6 and CL7 are included. In the example shown in FIG. 3, eight information bit transmission lines CL0 to CL7 are connected to resistors R0 ,.
..... Connected to the load power supply line 31 that supplies the stabilized DC voltage VB of 5 volts via R5, R6, and R7, and the eight information bit transmission lines CL0 to CL7 The respective potentials are stabilized.

In an example of the multiplex transmission apparatus according to the present invention configured as described above, for example, when the left door P / W switch 20 connected to the input / output processing unit 18 in the node unit 12A is operated. The operation state in which the digital control information is transmitted under the condition that the node unit 12A is set as the transmitting node unit and the node unit 12D is set as the receiving node unit is set. At this time, the left door P / W switch 20 supplies the left door P / W control signal SSLX to the input / output processing unit 18 in the node unit 12A in response to the operation of the left door P / W switch 20.

At this time, in the node section 12A, the input / output processing section 1 to which the left door P / W control signal SSLX is supplied.
8, digital data DSI based on the left door P / W control signal SSLX is formed, and the formed digital data DSI is supplied to the arithmetic and control unit 16 through the data bus 17. Based on the digital data DSI, the arithmetic and control unit 16 forms the digital control information DIL which has a data frame unit as shown in FIG. At that time, the arithmetic and control unit 16
Is, for example, as shown in FIG. 4, data DT0, DT1, DT2, and D, each of which constitutes each data frame unit of the digital control information DIL and has an 8-bit configuration.
Data DT0 of T3 is assigned the least significant bit B0 to the control information bit PWL for the left door P / W device, and further the other bits B1 to B7 are assigned to other control information bits as necessary. Form. When the control information bit PWL for the left door P / W device is "0", it indicates that the left door window should be opened by the left door P / W device 29, and is "1". At this time, the left door P / W device 29 indicates that the left door window should be closed.

Further, the arithmetic and control unit 16 is provided with data DT0, DT1, D as shown in FIG.
Data DT1 adjacent to data DT0 of T2 and DT3 is formed as data of check information ICH having a preset bit pattern, and the bit pattern is formed from least significant bit B0 to bits B1, B2, B.
Each bit from 3, B4, B5 and B6 to the most significant bit B7 is alternately set to "0" and "1".
Therefore, the digital control information DIL is data in which each data frame unit forming the digital control information DIL includes the control information bit PWL for the left door P / W device and the control information bit PWR for the right door P / W device. The data DT0 and the data DT1 formed as the data of the check information ICH having the preset bit pattern are included.

The digital control information DIL thus formed by the arithmetic and control unit 16 is supplied to the multiplex communication section 14 through the data bus 15. In the multiplex communication unit 14, according to the digital control information DIL,
An NRZ-modulated carrier signal SIL obtained by NRZ modulation is thereby formed, and the formed NRZ-modulated carrier signal SIL is sent to the bidirectional communication line 11 through the bidirectional pull-in line 13.

On the other hand, in the node unit 12D, the NRZ modulated carrier signal SIL sent from the multiplex communication unit 14 in the node unit 12A to the bidirectional communication line 11 and transmitted through the bidirectional communication line 11 is used for the bidirectional communication. Multiplex communication unit 24 from line 11 through bidirectional service line 13
Is taken into. Then, in the multiplex communication section 24 in the node section 12D, the taken-in NRZ modulated carrier signal SIL is demodulated to reproduce the digital control information DIL, and the reproduced digital control information DIL is transmitted through the data bus 25 to the arithmetic control unit 26. Is supplied to.

The arithmetic control unit 26, to which the reproduced digital control information DIL is supplied, first detects the data DT1 formed as the data of the check information ICH in each data frame unit forming the digital control information DIL. , Its bit pattern is the node part 1
Whether the bit pattern is set by the arithmetic control unit 16 in 2A, that is, each bit from the least significant bit B0 to the most significant bit B7 through the most significant bit B1 to B6 as shown in FIG. 0 ”and“ 1 ”
Check if and are taken alternately. As a result, when the data DT1 is such that the bit pattern set in the arithmetic control unit 16 in the node section 12A is maintained, the data in each data frame unit forming the supplied digital control information DIL It is determined that DT0 is also appropriate. Then, the arithmetic control unit 26 uses the data DT
Control information bit PWL for left door P / W device at 0
P / according to the contents of the least significant bit B0 assigned to
W control data DDL is formed, and it is formed on the data bus 27.
To the input / output processing unit 28.

In the P / W control data DDL formed in the arithmetic and control unit 26, the content of the least significant bit B0 assigned to the control information bit PWL for the left door P / W device in the data DT0 is "0". Left door P
Content for instructing the left door P / W device 29 to perform an operation of opening the left door window when the / W device 29 instructs the left door window to be opened In addition, the content of the least significant bit B0 in the data DT0 is "1", and indicates that the left door P / W device 29 should close the left door window. When
It has contents for instructing the left door P / W device 29 to perform an operation for closing the left door window.

In the input / output processing unit 28 to which the P / W control data DDL is supplied, the P / W control signal SDL based on the P / W control data DDL is formed and the P / W control signal SDL is generated. It is supplied to the left door P / W device 29 connected to the input / output processing unit 28. In that case, P / W
As for the control signal SDL, the P / W control data DDL is the left door P.
/ W device 29 has a content to instruct that the operation to open the left door window should be performed, for example, it is a positive signal, and the P / W control data DDL is left. When the door P / W device has a content to instruct the door P / W device to perform the operation of closing the left door window, for example, it is a negative signal.

Then, the left door P / W device 29, to which the P / W control signal SDL which is a positive polarity signal is supplied, receives the operation control by the P / W control signal SDL and opens the left door window. Perform the operation to set the status. Further, the left door P / W device 29, to which the P / W control signal SDL that is a negative signal is supplied, receives the operation control by the P / W control signal SDL and closes the left door window. Take action.

On the other hand, by the arithmetic control unit 26 to which the reproduced digital control information DIL is supplied,
As a result of checking the bit pattern of the data DT1 formed as the data of the check information ICH in each data frame unit forming the digital control information DIL, the data DT1 is set to the bit pattern set in the arithmetic control unit 16 in the node unit 12A. If it is determined that the operation control unit 26 in the node unit 12A is not maintained,
Through the multiplex communication unit 14 in the node unit 12A, the two-way communication line 11 and the multiplex communication unit 24 in the node unit 12D to the operation control unit 26 in the node unit 12D, a failure has occurred somewhere in the information transmission path. , It is determined that the data DT0 in each data frame unit forming the supplied digital control information DIL is not proper. Then, in such a case, the arithmetic and control unit 26 forms the P / W control data DDL,
The operation of supplying it to the input / output processing unit 28 through the data bus 27 is not performed.

As a result, when the data DT1 in each data frame unit forming the reproduced digital control information DIL does not maintain the bit pattern set in the operation control unit 16 in the node section 12A. To the left door P / W device 29 from the input / output processing unit 28 in the node unit 12D.
Since the control signal SDL is not supplied, the left door P /
The W device 29 is maintained in the inoperative state. Therefore, the left door P connected to the input / output processing unit 28 in the node unit 12D
The / W device 29 is placed in a malfunctioning state in which undesired operation control is performed according to the least significant bit B0 which is the control information bit PWL for the left door P / W device in the incorrect data DT0. Will be avoided.

As described above, by operating the left door P / W switch 20 connected to the input / output processing unit 18 in the node unit 12A, the multi-communication unit 14 in the node unit 12A causes the bidirectional communication line. 11, the NRZ modulated carrier signal SI based on the digital control information DIL
L is transmitted, the NRZ modulated carrier signal SIL is taken in from the bidirectional communication line 11 to the multiplex communication unit 24 in the node unit 12D, and is demodulated in the multiplex communication unit 24 to reproduce the digital control information DIL. When the operation control for the left door P / W device 29 connected to the input / output processing unit 28 in the node unit 12D is performed, for example, the multiplex communication unit in the node unit 12A configured as shown in FIG. 14 and the arithmetic and control unit 16, or the eight information bit transmission lines CL0 to CL7 between the multiplex communication unit 24 and the arithmetic and control unit 26 in the node unit 12D, the information bit transmission line CL0 among them is grounded. If a failure occurs, the operation control unit 26 of the node unit 12D is affected thereby. In the reproduced digital control information DIL obtained, the contents of the least significant bit B0 assigned to the control information bit PWL for the left door P / W device in the data DT0 in each data frame unit forming the node portion are the contents of the node part. Regardless of the setting in the arithmetic and control unit 16 of 12A, the value is set to "0", which is an inappropriate value.

In this case, the data DT1 which is the data of the check information ICH in each data frame unit which constitutes the reproduced digital control information DIL obtained in the arithmetic control unit 26 of the node unit 12D,
The content of the least significant bit B0 is set to "0", but for the data DT1, the state in which the content of the least significant bit B0 is set to "0" is as shown in FIG. In addition, the state is the same as the state in which the normal bit pattern set in the arithmetic control unit 16 in the node unit 12A is included. Therefore, in the result of the check of the bit pattern of the data DT1 in each data frame unit forming the digital control information DIL by the operation control unit 26 of the node unit 12D, the data DT1 is set in the operation control unit 16 of the node unit 12A. It is assumed that the generated bit pattern is maintained, and the data DT0 in each data frame unit forming the digital control information DIL is also determined to be appropriate.

Therefore, even under such a condition, the left door P / W is fed from the input / output processing unit 28 in the node unit 12D.
The P / W control signal SDL is supplied to the device 29,
The operation control of the left door P / W device 29 is performed. The operation control of the left door P / W device 29 is performed by the data DT0 in each data frame unit that constitutes the digital control information DIL. Left door P / W
By setting the content of the least significant bit B0 assigned to the control information bit PWL for the device to "0", the left door P / W device 29 is caused to perform the operation of opening the left door window. It

In the vehicle, the opening of the door window does not cause a situation in which an occupant in the vehicle may get a finger caught between the window glass and the window frame, for example. The safety is not adversely affected. Therefore, as described above, for example, between the multiplex communication unit 14 and the arithmetic control unit 16 in the node unit 12A, or between the multiplex communication unit 24 and the arithmetic control unit 2 in the node unit 12D.
6 information bit transmission lines CL0 to CL7
In the above, the operation for causing the left door P / W device 29 to perform the operation of opening the left door window, which will be performed under the failure that the information bit transmission line CL0 is grounded The control is to control the left door P / W device 29 to perform an operation that does not adversely affect the safety of the occupant in the vehicle.

That is, for example, eight information bit transmission lines are provided between the multiplex communication unit 14 and the operation control unit 16 in the node unit 12A, or between the multiplex communication unit 24 and the operation control unit 26 in the node unit 12D. CL
In 0 to CL7, as in the case where the information bit transmission line CL0 among them is grounded, from the operation control unit 16 in the node unit 12A to the multiplex communication unit 14, the bidirectional communication line 11 and the node unit 12D in the node unit 12A. Via the multiplex communication unit 24, the node unit 12D
The check information ICH obtained in the arithmetic control unit 26 of the node unit 12D despite the failure of the information transmission path reaching the arithmetic control unit 26 in
In the case where the data DT1 that is set as the data of is assumed to maintain the preset regular bit pattern,
The left door P / W device 29 connected to the input / output processing unit 28 in the node unit 12D opens the left door window, which is a malfunction but does not adversely affect the safety of passengers in the vehicle. The subject is subject to motion control that will cause the scheduled malfunction.

As described above, when the operation state is established in which the digital control information is transmitted under the condition that the node unit 12A is set as the transmitting node unit and the node unit 12D is set as the receiving node unit. The control operation program executed by the arithmetic and control unit 26 in the node unit 12D set as the receiving node unit is represented by the flowchart shown in FIG.

In the control operation program represented by the flowchart of FIG. 5, after the start, in step 41, it is judged whether or not the digital control information DIL has arrived from the multiplex communication section 24 through the data bus 25. As a result, when the digital control information DIL has not arrived, the determination in step 41 is repeated.

If the result of determination in step 41 is that the digital control information DIL has arrived, step 42
In step 43, the digital control information DIL is fetched, and in the following step 43, the check information I in each data frame unit forming the digital control information DIL
It is determined whether or not the data DT1 used as the CH data maintains the regular bit pattern. As a result, when the data DT1 does not maintain the regular bit pattern, the process returns to step 41.

On the other hand, if the result of determination in step 43 is that the data DT1 maintains a normal bit pattern, in step 44 the digital control information DIL
Is formed by forming the P / W control data DDL according to the contents of the least significant bit B0 assigned to the control information bit PWL for the left door P / W device in the data DT0 in each data frame unit forming The P / W control data DDL is supplied to the input / output processing unit 28 through the data bus 27, and then the process returns to step 41.

In the example of the multiplex transmission apparatus according to the present invention shown in FIG. 1, when the right door P / W switch 21 connected to the input / output processing section 18 in the node section 12A is operated, Depending on the operation, right door P / W
The right door P / W control signal SSR is supplied from the switch 21 to the input / output processing unit 18 in the node unit 12A. At this time, in the node unit 12A, in the input / output processing unit 18 to which the right door P / W control signal SSR is supplied, the digital data DSI based on the right door P / W control signal SSR is received.
Is formed, and the formed digital data DSI is supplied to the arithmetic and control unit 16 through the data bus 17. The digital data DSI formed at this time indicates that the right door window should be opened by the right door P / W device 19 according to the right door P / W control signal SSR, or the right door P / W device should be opened. Reference numeral 19 indicates that the right door window should be closed.

The arithmetic control unit 16 to which the digital data DSI based on the right door P / W control signal SSR is supplied, forms the P / W control data DDR based on the digital data DSI, and the formed P The / W control data DDR is supplied to the input / output processing unit 18 via the data bus 17. At that time, the P / W control data DDR is
When the digital data DSI indicates that the right door window should be opened by the right door P / W device 19, the right door P / W device 19 is caused to perform the operation of opening the right door window. When the digital data DSI indicates that the right door window should be closed by the right door P / W device 19, the right door P / W is displayed. It has contents for instructing the device 19 to perform the operation of closing the right door window.

In the input / output processing section 18 to which the P / W control data DDR is supplied, the P / W control data DD
A P / W control signal SDR based on R is formed and
The W control signal SDR is supplied to the right door P / W device 19 connected to the input / output processing unit 18. At this time, the P / W control signal SDR is the P / W control data DDR when the right door P / W.
When the device 19 has a content instructing that the operation for opening the right door window should be performed,
For example, the signal has a positive polarity, and the P / W control data DDR has a content for instructing the right door P / W device 19 to perform an operation of closing the right door window. At this time, for example, the signal has a negative polarity.

Then, the right door P / W device 19 to which the P / W control signal SDR which is a positive signal is supplied receives the operation control by the P / W control signal SDR and opens the right door window. Perform the operation to set the status. Further, the right door P / W device 19 to which the P / W control signal SDR that is a negative signal is supplied receives the operation control by the P / W control signal SDR and closes the right door window. Take action.

Further, when the left door P / W switch 30 connected to the input / output processing unit 28 in the node unit 12D is operated, the left door P / W switch 30 changes from the left door P / W switch 30 in response to the operation. Control signal SSL is node 1
It is supplied to the input / output processing unit 28 in 2D. At this time, in the node portion 12D, the left door P / W control signal SS
In the input / output processing unit 28 supplied with L, the left door P /
Digital data DSL is formed based on the W control signal SSL, and the formed digital data DSL is supplied to the arithmetic and control unit 26 through the data bus 27. The digital data DSL formed at this time is the left door P
According to the / W control signal SSL, the left door P / W device 29 should open the left door window, or the left door P / W device 29 should close the left door window. Is represented.

The arithmetic control unit 26 to which the digital data DSL based on the left door P / W control signal SSL is supplied forms the P / W control data DDL based on the digital data DSL, and forms the P / W control data DDL. The P / W control data DDL thus generated is supplied to the input / output processing unit 28 through the data bus 27. At this time, the P / W control data DDL indicates that the digital data DSL indicates that the left door window should be opened by the left door P / W device 29.
Has a content to instruct that the left door window should be opened, and the digital data DSL should be closed by the left door P / W device 29. If it indicates that, it has contents for instructing the left door P / W device 29 to perform an operation of closing the left door window.

In the input / output processing unit 28 to which the P / W control data DDL is supplied, the P / W control data DD
A P / W control signal SDL based on L is formed and its P / W
The W control signal SDL is supplied to the left door P / W device 29 connected to the input / output processing unit 28. At this time, the P / W control signal SDL is the same as the P / W control data DDL.
When the device 29 has a content instructing that the device 29 should perform the operation of opening the left door window,
For example, the signal has a positive polarity, and the P / W control data DDL has a content that instructs the left door P / W device 29 to perform an operation of closing the left door window. At this time, for example, the signal has a negative polarity.

The left door P / W device 29, to which the P / W control signal SDL having a positive polarity signal is supplied, opens the left door window under the operation control by the P / W control signal SDL. Perform the operation to set the status. Further, the left door P / W device 29, to which the P / W control signal SDL that is a negative signal is supplied, receives the operation control by the P / W control signal SDL and closes the left door window. Take action.

[0048]

As is apparent from the above description, in the multiplex transmission apparatus according to the present invention, the first node unit serves as the transmitting node unit and the second node unit serves as the receiving node unit. And the digital control information formed by the first control unit in the first node section is transmitted to the communication line through the first communication section in the first node section, and the digital control information is transmitted from the communication line to the second node section. Through the second communication unit in the second node unit in the second
When the information transmission to be taken in by the control unit is performed, a failure has occurred in the information transmission path from the first control unit to the second control unit via the first communication unit, the communication line and the second communication unit. At times, a state in which the execution of the control operation according to the digital control information captured by the second control unit is stopped, or a control operation according to the captured digital control information executed by the second control unit is For example, since the operated control unit connected to the second node unit is caused to perform an operation that does not adversely affect the safety of the occupant of the vehicle, a predetermined malfunction occurs. Therefore, the first control unit From the first communication unit, the communication line, and the second communication unit to the second control unit, even if there is a failure in the information transmission path. The operation control section connected to the section is, regardless of the type, will be shall not receive undesired operation control is a state that will adversely affect the safety of vehicle occupants.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an example of a multiplex transmission device according to the present invention when applied to a vehicle.

FIG. 2 is a conceptual diagram provided for explaining digital control information in the example of the multiplex transmission apparatus according to the present invention shown in FIG.

FIG. 3 is a partial detailed view showing a part in a node unit used in the example of the multiplex transmission apparatus according to the present invention shown in FIG.

FIG. 4 is a conceptual diagram provided for explaining digital control information in the example of the multiplex transmission apparatus according to the present invention shown in FIG. 1.

5 is a flowchart showing an operation control program executed by an arithmetic and control unit in a node unit which is a receiving node unit in the example of the multiplex transmission apparatus according to the present invention shown in FIG.

[Explanation of symbols]

 11 bidirectional communication line 12A, 12B, 12C, 12D node section 13 bidirectional pull-in line 14, 24 multiplex communication section 15, 17, 25, 27 data bus 16, 26 arithmetic control unit 18, 28 input / output processing section 19 right door P / W device 20,30 Left door P / W switch 21 Right door P / W switch 29 Left door P / W device 31 Load power line

Claims (4)

[Claims] 1. A communication line in which a plurality of types of digital control information are multiplexed and transmitted, and an operation state which is connected to the communication line and forms digital control information including check information having a preset bit pattern. A first control unit, and
A first node unit having a first communication unit, which is in an operating state for transmitting digital control information including the checking information formed by the first control unit to the communication line, and the communication line. A second communication unit which is connected and is in an operation state of taking in digital control information including check information sent from the first node unit to the communication line;
And receiving the digital control information including the check information fetched by the second communication unit, and the check information included in the fetched digital control information maintains the preset bit pattern. When
When the control operation according to the captured digital control information is executed and the checking information included in the captured digital control information does not maintain the preset bit pattern, the captured digital control is performed. A second node unit having a second control unit that is in an operation state in which execution of a control operation according to information is stopped, and the first control unit stores the check information in the second node unit. From the first control unit to the second line via the communication line.
If the preset bit pattern is to be maintained even when an abnormality has occurred in the information transmission path leading to the control unit, the fetched digital control information executed by the second control unit. The multiplex transmission apparatus is characterized in that the control operation according to is set so as to cause a result of a scheduled malfunction. 2. A scheduled malfunction executed by the second control unit causes the operated control unit connected to the second node unit to perform an operation that does not adversely affect safety. The multiplex transmission device according to claim 1, wherein the multiplex transmission device is provided. 3. The second node unit includes a second communication unit and a second communication unit.
In addition to the control unit, the input / output processing unit connected to the second control unit is built in, and the input / output processing unit is at least the second control unit obtained from the second control unit.
Receiving the control output information based on the digital control information fetched by the communication section of the communication section and supplying an operation control signal to the operated control section in accordance with the control output information. Item 2. The multiplex transmission device according to item 2. 4. When the second control unit does not maintain the preset bit pattern in the check information included in the digital control information fetched by the second communication section, the input / output processing section is provided with the above-mentioned information. 4. The multiplex transmission device according to claim 3, wherein the supply of control output information based on the digital control information taken in by the second communication unit is stopped.