JP3335422B2 - Multiplex transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Recently, with the increase in the number of electric components or control systems to be equipped and the progress of computerization in various electric components or control systems, wiring, connectors, and connectors arranged in vehicles have been developed. The number of electronic control devices has increased remarkably, and as a result, the size and weight of the wire harness attached to the vehicle body have been increased. And the larger wire harness is
The installation space of the harness to the vehicle body will be limited, and the flexibility of the wire / harness will be reduced, leading to a reduction in the efficiency of the assembling work.
An increase in the weight of the wire harness directly leads to an increase in the weight of the vehicle.

In order to reduce the number of wirings, connectors and electronic control units in a vehicle, for example, Japanese Patent Laid-Open No.
As shown in -16845, a common communication line for multiplex transmission of a plurality of types of control information for performing operation control on various electric components mounted on a vehicle, a control system, and the like is provided. The communication line is connected to a plurality of nodes for transmitting control information or taking in control information, and various electrical components and control systems mounted on the vehicle are connected to the plurality of nodes as appropriate. It has been proposed to build 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 path formed by a wire harness provided in a vehicle body. Each of the plurality of node units connected to the communication line includes a signal generation unit such as various sensors and switches, and an operation control 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 generation unit and the operated control unit are connected includes, for example, a multiplex communication unit connected to a communication line, and an input / output connected to the signal generation unit and the operated control unit. A processing unit, and an arithmetic and control unit including, for example, a microcomputer interposed between the multiplex communication unit and the input / output processing unit, and includes control information based on a signal from the signal generation unit. And an operation state for transmitting the same to a communication line, and taking in control information selected from the communication line, forming an operation control signal based on the taken in control information, and controlling an operation to be connected thereto. An operation state in which the operation is supplied to the section and the operation is controlled is selectively taken. The control information provided for the multiplex transmission by the communication line is, for example, digital control information each represented by a pulse code modulation (PCM) signal. In transmission, non-return-to-zero (NRZ) modulation is used. In the form of an NRZ modulated carrier signal obtained by

[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 transmitting digital control information and capturing digital control information in a vehicle. In a multiplex communication mechanism constructed by connecting a plurality of nodes, transmission of digital information between a plurality of node units forms digital control information based on a signal from a signal generation unit, and transmits the digital control information to a communication line. Digital control information transmitted by the transmission node unit is fetched from a communication line from a node unit (transmission node unit) assumed to be in an operation state to be transmitted, and an operation control signal based on the fetched digital control information is formed; A node unit that takes an operation state to supply it to the connected operated control unit and control 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 control unit and the multiplex communication unit in the transmission node 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 formed. For example, if a failure such as a partial disconnection accident or a short circuit accident occurs in any of the signal transmission path and the signal transmission path 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 and control unit in the transmission node unit is not supplied in a proper state to the arithmetic and control unit in the transmission node unit. And an improper operation control for the operated control unit connected to the receiving node unit is formed. Become dividing.

[0007] Then, when a situation occurs where the operation control unit in the receiving node unit performs improper operation control on the operated control unit in response to the operation control signal formed based on the improper digital control information, Depending on the type, the operated control unit may be subjected to undesired operation control in a state that adversely affects the safety of the occupant of the vehicle.

In view of the above, the present invention provides a communication line provided in a vehicle, wherein a plurality of node units each including a multiplex communication unit and an arithmetic control unit are connected to each other. When the transmitting node unit and the receiving node unit are set in the node units and the digital control information is transmitted from the transmitting node unit to the receiving node unit via the communication line, the transmitting node unit is set. In the case where a failure occurs in a signal transmission path from the arithmetic and control unit in the transmission node unit to the arithmetic and control unit in the reception node unit via the multiplex communication unit and communication line in the transmission node unit and the multiplex communication unit in the reception node unit, the reception node An undesired operation in which the operated control unit connected to the unit is in a state that will adversely affect the safety of the occupant of the vehicle regardless of its 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-mentioned object, a multiplex transmission apparatus according to the present invention is connected to a communication line through which a plurality of types of digital control information are multiplex-transmitted, and is connected to the communication line and set in advance. A first control unit that takes an operation state of forming digital control information including check information having a bit pattern, and an operation state of sending control information formed by the first control unit to a communication line. Includes a first node unit that is built as a transmission node unit and has a built-in first communication unit, and includes check information that is connected to a communication line and transmitted from the first node unit to the communication line. A second communication unit which takes an operation state for taking in digital control information, and a supply of digital control information including check information taken in by the second communication unit; When the check information included in the digital control information captured with maintains the bit pattern set in advance, control for causing operation in response to the digital control information taken into the operation control unit
Taking the operating state of transmitting the control data, also when the check information included in the digital control information captured does not maintain a preset bit pattern, the operation according to the digital control information captured Operated control
A second node unit, which has a built-in second control unit that takes an operation state in which control data is not transmitted to cause the unit to perform, and is configured to be a reception node unit;
The second control unit built in the second node portions, the first
Even from the control unit to the Moto an abnormality occurs in the information transmission path to the second control unit via the communication line, the
2 included in the digital control information captured by the communication unit.
When the check information to be kept is to maintain a preset bit pattern, it is assumed that control data for causing the operated control unit to perform a scheduled malfunction is to be transmitted , Be composed.

[0010]

The multiplex transmission according to the present invention configured as described above.
In the device , the digital control information formed by the first control unit under the condition that the first node unit is a transmitting node unit and the second node unit is a receiving node unit is the first node unit. The signal is transmitted to the communication line through the communication unit, and is transmitted from the communication line to the second communication unit through the second communication unit.
Is transmitted to the control unit. Then, in the second node unit, which is a receiving node unit,
It performed the detection of the bit pattern of checking information contained in the captured digital control information, the bit pattern of the check information, and when a bit pattern which is previously set in the first control unit is taken when its Controlled according to the digital control information
Control data to be sent to the
Thus, a control operation of the operated control unit according to the digital control information taken in the second node unit is executed.

As a result of the detection of the bit pattern of the check information included in the digital control information fetched by the second node unit, the bit pattern of the check information is preset in the first control unit. When the bit pattern is different from the
The first communication unit, the communication line and the second communication unit
It is highly likely that some trouble has occurred in the information transmission path from the communication unit to the second control unit, and that the digital control information taken into the second node unit is not appropriate. Therefore, in such a case, in the second node unit,
According to the digital control information captured at that time .
Control data for causing the operated control unit to perform the operation is not transmitted , and thereby , the second
The execution of the control operation according to the digital control information taken into the second node unit is stopped.

As described above, as a result of the detection of the bit pattern of the check information included in the digital control information fetched by the second node unit, the bit pattern of the check information is changed to the first control unit. In the state in which the bit pattern is set in advance, no 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. In addition to the above, 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 has a fault. Could be obtained. Therefore, in the multiplex transmission apparatus according to the present invention, the first communication unit from the first control unit, failure occurs in the information transmission path to the second control unit via the communication line and a second communication unit The second no
Of the digital control information captured in the
Click information is intended to keep the bit pattern set in advance Rutoki, at the second node unit, the operation system
A malfunction expected in the control unit, for example, the operated control unit
Connected to the node part of the vehicle
At this time, control data for causing the vehicle occupant to perform an operation that does not adversely affect safety is transmitted. It
The operation control unit adversely affects the safety of the occupants of the vehicle.
It is in a state that has no effect.

Thus, the multiplex transmission apparatus according to the present invention is provided.
According to the arrangement , under the condition that the first node unit is a transmitting node unit and the second node unit is a receiving node unit,
Digital control information formed by the first control unit is transmitted to the communication line through the first communication unit, and the information transmitted from the communication line to the second control unit through the second communication unit is transmitted. When a failure occurs in an 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, for example, the second node
Operated control unit connected to the unit and equipped on the vehicle
The second node portion captured digital control information state execution be deprived of the control operation in accordance with or, will not adversely affect the safety of vehicle occupants which it was installed in the operation control unit Performed malfunction
State that is taken. Accordingly, the first control unit passes through the first communication unit, the communication line, and the second communication unit to the second communication unit.
Even if a failure occurs in the information transmission path leading to the control unit, the operated control unit connected to the receiving node unit
Irrespective of the type, undesired operation control that is in a state of adversely affecting the safety of the occupant of the vehicle is not received.

[0014]

FIG. 1 shows an example of a multiplex transmission apparatus according to the present invention applied to a vehicle.

In the example shown in FIG. 1, a plurality of node units 12A and 12A are connected to a bidirectional communication line 11 installed on the vehicle body and through which multiple types of digital control information are multiplexed and transmitted.
B, 12C and 12D are connected. Node section 12
A is a multiplex communication unit 14 having a communication input / output terminal connected to the bidirectional communication line 11 through the bidirectional drop-in line 13.
And an operation 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 operation control unit 16 via a data bus 17. The input / output terminal of the input / output processing unit 18 is connected to a right door power window (right door P / W) device 19, which is an operated control unit in the vehicle, and a left door, which is a signal generation unit in the vehicle. A power window (left door P / W) switch 20 and a right door P / W switch 21 are connected.

The node unit 12D includes a multiplex communication unit 24 having a communication input / output terminal connected to the bidirectional communication line 11 via the bidirectional drop-in line 13, and an arithmetic unit connected to the multiplex communication unit 24 via the data bus 25. 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 a left door P / W device 29 which is a driven control unit of the vehicle, and a left door P / W switch 30 which is a signal generation unit of the vehicle. It is connected. Further, although not shown, each of the node unit 12B and the node unit 12C is also connected to the bidirectional communication line 11 in the same manner as the node unit 12A or the node unit 12D.
A multiplex communication unit to which a communication input / output terminal is connected,
An arithmetic control unit connected to the multiplex communication unit through a data bus, and an input / output processing unit connected to the arithmetic control unit through the data bus are built in. The operated control section or the signal generating section arranged is connected.

The nodes 12A, 12B, 12C and 12
Each of D includes a battery mounted on the vehicle, an AC generator driven by an engine mounted on the vehicle, and a rectifier that rectifies a power 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 unit formed by the rectification unit. 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 11 through the bidirectional drop-in line 13 are provided.
In an example of the multiplex transmission apparatus according to the present invention including A, 12B, 12C, and 12D, multiplex transmission is performed through a bidirectional communication line 11 having a plurality of bidirectional drop-in lines 13. Each of the digital control information is
For example, the data is transmitted as constituting a data frame unit. The data frame unit of the digital control information is, for example, a group of code data composed of a predetermined total number of bits, for example, 85 bits, as shown in FIG. Start marker SOM, data PR indicating the priority of 8-bit configuration, data ID indicating the type of information each having an 8-bit configuration, data DT3, DT2, DT1 and DT0, 8-bit configuration indicating information to be transmitted Error correction data CRC, a 1-bit data end flag EOD, information reception acknowledgment data ANC2, ANC1 and ANC0 each having an 8-bit configuration, and an end marker EOM having a 2-bit configuration. You.

As described above, a plurality of bidirectional service lines 1
Each of the digital control information to be multiplex-transmitted through the two-way communication line 11 accompanied by 3 is mainly formed of 8-bit code data.
In each of the node units 12A, 12B, 12C and 12D, a data bus (15, 25) between the multiplex communication unit (14, 24) and the arithmetic and control unit (16, 26) is provided.
For example, as shown in FIG. 3, a control data bus CB and eight information bit transmission lines CL0,...
-It is configured to include CL5, CL6 and CL7. In the example shown in FIG. 3, eight information bit transmission lines CL0 to CL7 are respectively connected to resistors R0,.
... Connected to a load power supply line 31 for supplying a stabilized DC voltage VB of 5 volts via R5, R6 and R7, and connected to eight information bit transmission lines CL0 to CL7. The stabilization of each potential is achieved.

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. In this state, the digital control information is transmitted when the node unit 12A is set as the transmission node unit and the node unit 12D is set as the reception node unit. At this time, in response to the operation of the left door P / W switch 20, a left door P / W control signal SSLX is supplied from the left door P / W switch 20 to the input / output processing unit 18 in the node unit 12A.

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.
At 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 via the data bus 17. The arithmetic and control unit 16 forms digital control information DIL having a data frame unit as shown in FIG. 2 based on the digital data DSI. At that time, the arithmetic and control unit 16
For example, as shown in FIG. 4, the data DT0, DT1, DT2, and D each having an 8-bit configuration and constituting each data frame unit of the digital control information DIL.
In the data DT0 of T3, the least significant bit B0 is allocated to the control information bit PWL for the left door P / W device, and the other bits B1 to B7 are allocated to other control information bits as necessary. Form. When the control information bit PWL for the left door P / W device is set to "0", it indicates that the left door window should be opened by the left door P / W device 29, and becomes "1". Then, the left door P / W device 29 indicates that the left door window should be closed.

Further, the arithmetic and control unit 16 outputs data DT0, DT1, and D, for example, 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
The bits reaching the most significant bit B7 via 3, B4, B5 and B6 are alternately "0" and "1".
Accordingly, the digital control information DIL is each data frame units constituting it, for checking with predetermined bit pattern with data DT0 formed to include control information bits PW L for the left door P / W device Information IC
And the data DT1 formed as H data.

The digital control information DIL formed by the arithmetic and control unit 16 in this manner is supplied to the multiplex communication unit 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 the NRZ modulation is formed, and the formed NRZ modulated carrier signal SIL is transmitted to the bidirectional communication line 11 through the bidirectional drop-in line 13.

On the other hand, in the node section 12D, the NRZ modulated carrier signal SIL transmitted from the multiplex communication section 14 in the node section 12A to the bidirectional communication line 11 and transmitted through the bidirectional communication line 11 is transmitted to the bidirectional communication section 11A. Multiplexing communication unit 24 from line 11 through bidirectional service line 13
It is taken in. In the multiplex communication unit 24 in the node unit 12D, the captured NRZ modulated carrier signal SIL is demodulated to reproduce the digital control information DIL, and the reproduced digital control information DIL is transmitted to the arithmetic and control unit 26 through the data bus 25. Supplied to

The arithmetic and 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 constituting the digital control information DIL. , The bit pattern of the node unit 1
Whether or not the bit pattern is set in the arithmetic control unit 16 in 2A, that is, as shown in FIG. 4, each bit from the least significant bit B0 to the most significant bit B7 via the bits B1 to B6 is ""0" and "1"
It is checked whether or not they are alternately taken. As a result, if the data DT1 is assumed to maintain the bit pattern set in the arithmetic and control unit 16 in the node unit 12A, the data in each data frame unit constituting the supplied digital control information DIL It is determined that DT0 is also appropriate. Then, the arithmetic and control unit 26 outputs 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 is
To the input / output processing unit 28 through

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". And left door P
When instructing that the left door window should be opened by the / W device 29, the content instructing the left door P / W device 29 to perform an operation of opening the left door window. And the content of the least significant bit B0 in the data DT0 is “1”, indicating that the left door window should be closed by the left door P / W device 29. When
The content includes an instruction to cause 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, a 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 such a case, P / W
The control signal SDL indicates that the P / W control data DDL indicates that the left door P
/ W device 29 has a content instructing that the operation of opening the left door window should be performed, for example, a positive signal, and the P / W control data DDL is left When the content includes an instruction to cause the door P / W device to perform an operation of closing the left door window, the signal is, for example, a negative polarity signal.

Then, the left door P / W device 29 to which the P / W control signal SDL which is a signal of the positive polarity is supplied receives the operation control by the P / W control signal SDL and opens the left door window. Perform the operation of setting the state. Further, the left door P / W device 29 to which the P / W control signal SDL which is a signal of the negative polarity is supplied, receives the operation control by the P / W control signal SDL, and closes the left door window. Perform the operation.

On the other hand, the arithmetic and 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 constituting the digital control information DIL, the data DT1 is determined by the bit pattern set in the arithmetic and control unit 16 in the node 12A. Is not maintained, the arithmetic and control unit 26 sets the arithmetic and control unit 16 in the node unit 12A.
From the multiplex communication unit 14, the bidirectional communication line 11 in the node unit 12A, and the multiplex communication unit 24 in the node unit 12D, and a failure occurs in an information transmission path to the arithmetic control unit 26 in the node unit 12D. It is determined that the data DT0 in each data frame constituting the supplied digital control information DIL is not proper. In such a case, the arithmetic and control unit 26 forms the P / W control data DDL,
The state where the operation of supplying the signal to the input / output processing unit 28 through the data bus 27 is not performed is performed.

Thus, when the data DT1 in each data frame constituting the reproduced digital control information DIL does not maintain the bit pattern set in the arithmetic and control unit 16 in the node unit 12A. The P / W from the input / output processing unit 28 in the node unit 12D to the left door P / W device 29
No control signal SDL is supplied, and therefore the left door P /
The W device 29 is maintained in an inoperative state. Therefore, the left door P connected to the input / output processing unit 28 in the node unit 12D
/ W device 29 is in an erroneous operation state in which undesired operation control is performed according to least significant bit B0 set as control information bit PWL for left door P / W device in inappropriate data DT0. Will be avoided.

As described above, when the left door P / W switch 20 connected to the input / output processing unit 18 in the node unit 12A is operated, the multiplex communication unit 14 in the node unit 12A transmits the bidirectional communication line. 11, an NRZ modulated carrier signal SI based on digital control information DIL
L is transmitted, the NRZ modulated carrier signal SIL is taken in from the bidirectional communication line 11 into the multiplex communication unit 24 in the node unit 12D, and is demodulated in the multiplex communication unit 24 to reproduce digital control information DIL. When the operation control of 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 is configured as shown in FIG. In the eight information bit transmission lines CL0 to CL7 between the operation control unit 14 and the operation control unit 16 or between the multiplex communication unit 24 and the operation control unit 26 in the node unit 12D, the information bit transmission line CL0 is grounded. In the event that a failure occurs, the operation control unit 26 of the node unit 12D In the obtained reproduced digital control information DIL, 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 in each data frame unit constituting the digital control information DIL is the node portion. Regardless of the setting in the arithmetic and control unit 16 of 12A, it is determined to be inappropriate because it is set to "0".

In such a case, the data DT1 which is the data of the check information ICH in each data frame unit constituting the reproduced digital control information DIL obtained in the arithmetic and control unit 26 of the node unit 12D is also
The content of the least significant bit B0 is set to "0". 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. This is the same as the state having the normal bit pattern set in the arithmetic and control unit 16 in the node unit 12A. Accordingly, in the result of checking the bit pattern of the data DT1 in each data frame constituting the digital control information DIL by the arithmetic control unit 26 of the node unit 12D, the data DT1 is set in the arithmetic control unit 16 of the node unit 12A. Thus, it is determined that the data pattern DT0 in each data frame unit constituting the digital control information DIL is also appropriate.

Accordingly, even in such a case, the left door P / W is transmitted from the input / output processing unit 28 in the node unit 12D.
When 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 in the data DT0 in each data frame unit constituting the digital control information DIL. Left door P / W
By setting the content of the least significant bit B0 assigned to the device control information bit PWL to "0", the left door P / W device 29 performs an operation of opening the left door window. You.

When the door window is opened in the vehicle, the occupant in the vehicle does not have a possibility that, for example, a finger may be caught between the window glass and the window frame. A state will be taken in which its 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.
8 information bit transmission lines CL0 to CL7 between
In which the left door P / W device 29 performs the operation of opening the left door window, which is to be performed in the event that the information bit transmission line CL0 is grounded. The control is to cause 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 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 the case of 0 to CL7, as in the case where the information bit transmission line CL0 is grounded, the arithmetic and control unit 16 in the node unit 12A transmits 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 and control unit 26 of the node unit 12D despite the occurrence of a failure in the information transmission path to the arithmetic and control unit 26 in FIG.
When it is assumed that the data DT1 as the data of the above maintains the predetermined normal 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 the occupant in the vehicle. It is subject to operation control that will cause the intended malfunction to occur.

As described above, when the node 12A is set as the transmitting node and the node 12D is set as the receiving node when the digital control information is transmitted in the operating state. 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 a flowchart shown in FIG.

In the control operation program represented by the flowchart of FIG. 5, after starting, in step 41, it is determined whether or not digital control information DIL has arrived from the multiplex communication unit 24 via the data bus 25. As a result, if 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 digital control information DIL has arrived, step 42
In step 43, the digital control information DIL is fetched. In step 43, the check information I in each data frame unit constituting the digital control information DIL is obtained.
It is determined whether or not the data DT1 as the CH data maintains a regular bit pattern. As a result, if the data DT1 does not maintain the regular bit pattern, the process returns to step S41.

On the other hand, if the result of determination in step 43 is that data DT1 maintains a regular bit pattern, in step 44 digital control information DIL
And P / W control data DDL corresponding to 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 in each data frame unit forming the data frame unit. The supplied P / W control data DDL is supplied to the input / output processing unit 28 via the data bus 27, and thereafter, 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 unit 18 in the node unit 12A is operated, According to 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 output.
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 is that the right door window should be opened by the right door P / W device 19 in response to the right door P / W control signal SSR, or the right door P / W device Reference numeral 19 indicates that the right door window should be closed.

The arithmetic and 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 / W control data DDR is generated. / W control data DDR is supplied to the input / output processing unit 18 via the data bus 17. At this time, the P / W control data DDR is
When the digital data DSI indicates that the right door window is to be opened by the right door P / W device 19, the right door P / W device 19 is caused to perform an operation of opening the right door window. If 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 The content includes an instruction to cause the device 19 to perform an 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 its P / W
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 indicates that the P / W control data DDR indicates that the right door P / W
When the content includes an instruction to cause the device 19 to perform an operation of opening the right door window,
For example, the signal is a positive polarity signal, and the P / W control data DDR has a content 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 signal of the positive polarity is supplied receives the operation control by the P / W control signal SDR and opens the right door window. Perform the operation of setting the state. Further, the right door P / W device 19 to which the P / W control signal SDR which is a signal of the negative polarity is supplied, receives the operation control by the P / W control signal SDR, and closes the right door window. Perform the operation.

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 is switched to the left door P / W according to the operation. When the control signal SSL is the node unit 1
It is supplied to the input / output processing unit 28 in 2D. At this time, in the node unit 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 based on the W control signal SSL is formed, 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 corresponds to the left door P
In response to the / W control signal SSL, the left door window should be opened by the left door P / W device 29, or the left door window should be closed by the left door P / W device 29 It is assumed to represent.

The arithmetic and 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 data. The supplied P / W control data DDL is supplied to the input / output processing unit 28 through the data bus 27. At this time, if the digital data DSL indicates that the left door window should be opened by the left door P / W device 29, the P / W control data DDL indicates that the left door P / W device 29
And the digital data DSL is to be closed by the left door P / W device 29. If it indicates this, the content includes an instruction to cause 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,
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 indicates that the P / W control data DDL indicates that the left door P / W
When the content includes an instruction to cause the device 29 to perform an operation of opening the left door window,
For example, the signal is a signal of positive polarity, and the P / W control data DDL has contents indicating that the left door P / W device 29 should perform an operation of closing the left door window. At this time, for example, the signal has a negative polarity.

Then, the left door P / W device 29 supplied with the P / W control signal SDL as a positive polarity signal receives the operation control by the P / W control signal SDL and opens the left door window. Perform the operation of setting the state. Further, the left door P / W device 29 to which the P / W control signal SDL which is a signal of the negative polarity is supplied, receives the operation control by the P / W control signal SDL, and closes the left door window. Perform the operation.

[0048]

As is apparent from the above description, in the multiplex transmission apparatus according to the present invention, the first node unit is used as the transmitting node unit and the second node unit is used as the receiving node unit. The digital control information formed by the first control unit in the first node unit is transmitted to the communication line through the first communication unit in the first node unit, and is transmitted from the communication line to the second node unit. Through the second communication unit at the second node unit
When the information taken in by the control unit is transmitted, 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. Sometimes, for example, the second no
The operation control section connected to the
Does not adversely affect the safety with respect to the occupant of the vehicle equipped with the control unit in accordance with the digital control information taken into the second node unit. Perform the expected malfunction
Since state to I is taken, the first communication unit from the first control unit, even in the original a failure occurs in the information transmission path to the second control unit via the communication line and a second communication unit, the receiving node The operated control section connected to the section is not subjected to undesired operation control that is in a state that adversely affects the safety of the occupant of the vehicle regardless of the type.

[Brief description of the drawings]

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

FIG. 2 is a conceptual diagram serving to explain 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. 1;

FIG. 4 is a conceptual diagram serving to explain 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 serving as a receiving node unit in the example of the multiplex transmission apparatus according to the present invention shown in FIG.

[Explanation of symbols]

 Reference Signs List 11 bidirectional communication line 12A, 12B, 12C, 12D node unit 13 bidirectional service line 14, 24 multiplex communication unit 15, 17, 25, 27 data bus 16, 26 arithmetic control unit 18, 28 input / output processing unit 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04Q 9/00 H04L 12/40

Claims (4)

(57) [Claims] 1. A communication line through which a plurality of types of digital control information are multiplexed and transmitted, and an operation state for forming digital control information including check information having a predetermined bit pattern and connected to the communication line. A first control unit to take; and
A first node unit having a built-in first communication unit that operates to transmit digital control information including the check information formed by the first control unit to the communication line; A second communication unit which is connected and takes an operation state for taking in digital control information including check information transmitted from the first node unit to the communication line;
Receiving the digital control information including the check information fetched by the second communication unit, and maintaining the predetermined bit pattern in the check information included in the fetched digital control information. When you are
The operation corresponding to the captured digital control information to be
Operation to send control data to be performed by the operation control unit
State, and when the check information included in the fetched digital control information does not maintain the preset bit pattern, the control data is transmitted.
A second node unit incorporating a second control unit taking no operating state I, made by is provided, the second control unit, the second through the communication line from said first control unit even in Moto abnormality in leading signaling pathways to the control unit of the occurs, the take-up
Check information included in the embedded digital control information
And There shall maintain a bit pattern which is the preset
If a malfunction is expected to occur in the
A multiplex transmission apparatus for transmitting control data for causing the multiplex transmission. 2. An operated control unit is connected to a second node unit.
The vehicle is equipped with
The control data transmitted from the second control unit by the control unit
Scheduled malfunctions based on the vehicle's data
Multiplex transmission apparatus according to claim 1, characterized in that it is as potato such not to adversely affect the safety of. 3. The second node unit includes a second communication unit and a second communication unit.
And an input / output processing unit connected to the second control unit, wherein the input / output processing unit includes at least the second control unit obtained from the second control unit.
3. An operation state in which control data based on digital control information captured by the communication unit is received, and an operation control signal is supplied to the operated control unit in accordance with the control data. The multiplex transmission device as described in the above. 4. When the check information included in the digital control information fetched by the second communication unit does not maintain a predetermined bit pattern, the second control unit sends the input / output processing unit the above information. 4. The multiplex transmission apparatus according to claim 3, wherein supply of control data based on the digital control information captured by the second communication unit is stopped.