JP2919101B2 - 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 a multiplex transmission apparatus capable of reliably stopping the operation of a multiplex transmission network having actuators such as hydraulic actuators even if a failure occurs in a multiplex transmission path or the like. is there.

[0002]

2. Description of the Related Art Recently, in the field of automobiles, the number of electrical components such as switches, sensors, and actuators has increased along with the development of electronics, and thus the wiring harnesses connecting the electrical components have become increasingly large and complicated. Is a problem. Therefore, a multiplex transmission system in which one transmission line is shared by a large number of electrical components has been receiving attention. In particular,
Nodes of various electric components and engine control (EGI), four-wheel steering control (4WS), anti-lock brake control (A
) Are connected to the multiplex transmission path through the communication chip to form a time division multiplex transmission network. A communication chip arranged in each node transmits and receives communication data to and from another node through a multiplex transmission path.

[0003] Japanese Patent Application Laid-Open No. 2-184210 discloses that
An example in which a multiplex transmission network is constructed in an automobile is disclosed. In this example, a communication line composed of a twisted pair line is arranged in a loop to form a multiplex transmission line of one system.

[0004]

Since the conventional multiplex transmission apparatus has one multiplex transmission path, there is a problem that if a failure such as disconnection or short circuit occurs in the multiplex transmission path, communication becomes impossible immediately. . In particular, a configuration having an actuator and having an actuator node connected to the multiplex transmission line to drive the actuator, and a control node also connected to the multiplex transmission line to control the operation of the actuator node In the case of adopting the above, if a failure occurs in the multiplex transmission path as described above, communication between both nodes becomes impossible, so that the actuator remains operated and the operation of the actuator cannot be stopped. Sometimes things happened. A similar problem occurs when the communication chip of the actuator node breaks down.

An object of the present invention is to configure a multiplex transmission apparatus so that the operation of an actuator can be reliably stopped even if a failure occurs in a multiplex transmission path or an actuator node.

[0006]

In order to achieve the above-mentioned object, a solution of the present invention is to provide a multiplex transmission path between a control node for detecting a failure of a multiplex transmission path or a failure of an actuator node and an actuator node. Has a separate line dedicated to system down.

More specifically, the invention of claim 1 is:
An actuator node having an actuator and a communication chip connected to a multiplex transmission line, for driving the actuator based on communication data received via the communication chip; and a failure of the multiplex transmission line or the actuator A control node that sends out a system down signal to the actuator node when a node failure is detected, the multiplex transmission path is separately connected between the control node and the actuator node, and the communication chip fails. A line dedicated to system down for transmitting the system down signal sent from the control node so as to forcibly stop the operation of the actuator so that the actuator does not remain operated even when the actuator is in operation. It has been adopted.

According to a second aspect of the present invention, in the multiplex transmission apparatus according to the first aspect, the actuator node comprises:
A CPU for driving the actuator based on communication data received via the communication chip;
The control node and the CPU are connected so that the system down signal is directly supplied to the PU to shut off the power of the actuator.

[0009] The invention of claim 3 is claim 1 or claim 2.
The multiplex transmission device according to the above, wherein the control node adopts a configuration that controls operation of the actuator node via the multiplex transmission line when the failure of the multiplex transmission line or the failure of the actuator node is not detected. is there.

According to a fourth aspect of the present invention, in the multiplex transmission apparatus according to the first aspect, the control node includes a communication chip connected to the multiplex transmission line and a communication chip on the multiplex transmission line obtained through the communication chip. CPU for detecting failure of the multiplex transmission path or failure of the actuator node through information
The actuator node has a CPU for driving the actuator based on communication data received via the communication chip, and the system down dedicated line is a CPU of the control node In this configuration, the CPU of the control node is directly connected to the CPU of the actuator node so that the system down signal is supplied to the CPU of the node.

According to a fifth aspect of the present invention, in the multiplex transmission apparatus according to the first aspect, a plurality of the actuator nodes are provided, and the control node collectively monitors the multiplex transmission path and the plurality of actuator nodes for failures. And a configuration in which each of the plurality of actuator nodes is connected to the system down dedicated line.

[0012]

According to the first aspect of the present invention, when the failure of the multiplex transmission line or the failure of the actuator node is detected by the control node, the control node sends out a system down signal to the actuator node through the system down dedicated line. The operation of the actuator is forcibly stopped by the system down signal so that the actuator does not remain operated even when the communication chip of the actuator node has failed. As a result, the operation of the actuator of the actuator node for which communication has been disabled is reliably stopped.

According to the second aspect of the present invention, the system node down signal is supplied to the CPU of the actuator node, and the CPU shuts off the power supply of the actuator, whereby the communication of the actuator node is disabled. The operation of the actuator is stopped without fail.

According to the third aspect of the present invention, the control node controls the operation of the actuator node in a normal state when the control node does not detect the failure of the multiplex transmission line or the actuator node, and when the failure is detected, the system shuts down. The actuator is forcibly stopped by a dedicated line.

According to the fourth aspect of the present invention, the CPU provided in the control node monitors the failure of the multiplex transmission line or the actuator node through the information on the multiplex transmission line, and when the failure is detected, the system is controlled. A system down signal is supplied to the CPU of the actuator node through a dedicated line for down to forcibly stop the actuator.

According to the invention of claim 5, one control node collectively monitors the multiplex transmission path and the plurality of actuator nodes, and the space between the control node and each of the plurality of actuator nodes is dedicated to system down. They are connected by lines. When the control node detects a failure in the multiplex transmission path or any one of the plurality of actuator nodes, the control node sends a system down signal to the actuator node that has become unable to communicate due to the failure through a dedicated system down line. I do. At the actuator node receiving the system down signal, the operation of the actuator is forcibly stopped by the signal.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention for an automobile will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a multiplex transmission apparatus according to the present invention. The multiplex transmission device shown in FIG. 1 has a multiplex transmission line 1 composed of, for example, a twisted pair line,
A plurality of nodes are connected to the multiplex transmission line 1 to form a time division multiplex transmission network. this house,
Three nodes 10, 20, and 40 that control ABS control and one node 30 for failure notification are illustrated. 1
Reference numeral 0 denotes a sensor node having the sensor 13 for transmitting communication data (CAN) 11 connected to the multiplex transmission line 1 and read data from the sensor 13 to the multiplex transmission line 1 via the communication chip 11. CPU 12 is provided. 2
0 is an actuator node having an actuator 23, and is a communication chip (C) connected to the multiplex transmission line 1.
AN) 21 and C for driving the actuator 23 based on the communication data received via the communication chip 21.
PU22. Reference numeral 30 denotes a lamp node having an alarm lamp (W / L) 33 for failure notification, and a communication chip (CAN) 31 connected to the multiplex transmission line 1;
CPU 32 for turning on or off the alarm lamp 33 based on the communication data received through the communication chip 31
And

Reference numeral 40 denotes a control node for controlling the operation of the actuator node 20, and a communication chip (CAN) 41 connected to the multiplex transmission line 1 and a sensor from the sensor node 10 via the communication chip 41. CPU 42 for receiving the read data of T.13 and transmitting control communication data to the actuator node 20.
And Further, the CPU 42 has a function of detecting a failure such as a disconnection or a short circuit of the multiplex transmission path 1 through information on the multiplex transmission path 1 or a failure of the actuator node 20. A dedicated system down line 50 separate from the multiplex transmission line 1 is provided between the CPU 42 of the control node 40 and the CPU 22 of the actuator node 20. When a failure of the node 20 is detected, a system down signal is directly given to the CPU 22 of the actuator node 20 through the system down dedicated line 50 to thereby control the actuator 2.
3 is unconditionally shut off.

Next, the operation of the above multiplex transmission apparatus will be described. The CPU 42 of the control node 40 receives the read data of the sensor 13 from the sensor node 10 via the communication chip 41, and determines the operation mode of the actuator 23 based on the read data. The CPU 42 that has determined the operation mode,
The communication data addressed to the actuator node 20 is transmitted to the multiplex transmission line 1 through the communication chip 41. The CPU 22 of the actuator node 20 receives communication data addressed to itself from the multiplex transmission path 1 through the communication chip 21 and drives the actuator 23 based on the communication data.

However, if a failure such as a disconnection or short circuit occurs in the multiplex transmission line 1 or a failure occurs in the communication chip 21 of the actuator node 20, communication between the control node 40 and the actuator node 20 cannot be performed. Will be gone. In such a communication disabled state, a situation may occur in which the operation of the actuator 23 cannot be stopped because the actuator 23 remains operating. Therefore, the CPU 42 of the control node 40 constantly monitors the state of the multiplex transmission line 1 and the actuator node 20 through the information on the multiplex transmission line 1 and detects the failure of the multiplex transmission line 1 or the failure of the actuator node 20. In this case, a system down signal is supplied to the CPU 22 of the actuator node 20 through the system down dedicated line 50. Since the CPU 22 that has received the system down signal unconditionally shuts off the power supply of the actuator 23, the operation of the actuator 23 is reliably stopped thereafter. However, when detecting that a failure has occurred in the actuator node 20, the control node 40 notifies the failure by turning on the alarm lamp 33 of the lamp node 30 through the multiplex transmission line 1.

FIG. 2 is a block diagram showing another embodiment of the multiplex transmission apparatus of the present invention. In the figure, reference numeral 55 denotes a system-dedicated line configured as a second multiplex transmission line separate from the multiplex transmission line 1. The sensor node 10, the actuator node 20, the ramp node 30, and the control node 40 are: Not only the multiplex transmission line 1 but also the system-down dedicated line 55 are connected via communication chips.

When the control node 40 in this embodiment detects a failure of the multiplex transmission line 1 or a failure of the actuator node 20 through information on the multiplex transmission line 1, the control node 40 converts the system down signal through the dedicated system down line 55 into a multiplex signal. Simultaneously with the application to the actuator node 20, the alarm lamp 33 of the lamp node 30 is turned on through the system down dedicated line 55. As described above, the power supply of the actuator 23 is forcibly cut off at the actuator node 20 that has received the system down signal, and the operation of the actuator 23 is stopped. In particular, when a plurality of actuator nodes are connected to the multiplex transmission line 1, if the system down dedicated line is configured by a multiplex line as in the present embodiment, the system down signal is transmitted to each non-multiplex line as shown in FIG. In this case, the number of dedicated lines for system down can be reduced as compared with the case where the transmission is performed by the system. However, as shown in FIG. 1, the system down dedicated line 50 is constituted by a non-multiplex line and the CPU 42 of the control node 40 is used.
When the system down signal is directly supplied to the CPU 22 of the actuator node 20 from the communication node 21, even if a failure occurs in the communication chip 21 of the actuator node 20 and the actuator node 20 becomes incapable of receiving, the actuator 23 of the actuator node 20 cannot receive the signal. There is an advantage that the operation can be reliably stopped.

In the above description, the control node 40 for controlling the operation of the actuator node 20 has a failure diagnosis function. However, a plurality of actuator nodes are connected to a multiplex transmission line to form a multiplex transmission network. In this case, a dedicated control node for monitoring the multiplex transmission path and all the actuator nodes and detecting a failure thereof, that is, a monitoring node is provided separately from a control node for controlling the operation of the actuator node. A configuration in which only one is provided may be employed. The monitoring node and the plurality of actuator nodes are separately connected to system down lines separately from the multiplex transmission line. However, also in this case, each system-down dedicated line may be constituted by a non-multiplex line as shown in FIG. 1 or may be constituted by a multiplex line as shown in FIG. When the monitoring node detects a failure in the multiplex transmission path or any one of the plurality of actuator nodes, the monitoring node sends a system down signal to the system down dedicated line to the actuator node that has lost communication due to the failure. By doing so, the operation of the actuator of the actuator node that has become unable to communicate is forcibly stopped. By employing such a monitoring node, the burden on each control node can be reduced as compared with a case where each control node for controlling the operation of the actuator node has a failure diagnosis function. A low-cost CPU can be employed.

[0025]

As described above, according to the first aspect of the present invention, the system separate from the control node and the actuator node for detecting the failure of the multiplex transmission line or the failure of the actuator node is separate from the multiplex transmission line. A dedicated line for down is provided, and the operation of the actuator is forcibly stopped by transmitting the system down signal sent from the control node so that the actuator does not remain activated even when the communication chip of the actuator node is broken. With this configuration, even if a failure occurs in the multiplex transmission path or the actuator node and the communication of the actuator node becomes impossible, the operation of the actuator of the actuator node can be reliably stopped.

According to the second aspect of the present invention, the actuator node is provided with a CPU for driving the actuator based on the communication data received via the communication chip, and the CPU is connected to the system by a dedicated line for system down. Since the power of the actuator is shut off by giving the down signal, the operation of the actuator can be reliably stopped even when the communication chip is out of order.

According to the third aspect of the present invention, since the control node normally controls the operation of the actuator node and sends a system down signal in the case of the above-mentioned failure, the control node for controlling the operation of the actuator node and the failure monitoring It is not necessary to provide a separate node for use.

According to the fourth aspect of the invention, the CPU provided in the control node monitors the failure of the multiplex transmission line or the actuator node through the information on the multiplex transmission line, and when the failure is detected, the system down dedicated line is used. Thus, a system down signal is given to the CPU of the actuator node, so that even if the communication chip of the actuator node is out of order, the operation of the actuator can be reliably stopped.

According to the fifth aspect of the present invention, there is provided a control node for monitoring a multiplex transmission line and a plurality of actuator nodes collectively and performing a fault diagnosis, and a multiplex transmission line is provided between the control node and each actuator node. Adopted a configuration that provided a separate system down dedicated line, so even if a failure occurred in the multiplex transmission line or any actuator node,
The operation of the actuator of the actuator node for which communication has been disabled due to the failure can be reliably stopped even when the communication chip of the actuator node has failed. Moreover, the cost of each control node can be reduced as compared with the case where the function of diagnosing the failure of the actuator node is distributed to a plurality of control nodes.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of a multiplex transmission apparatus according to the present invention.

FIG. 2 is a block diagram showing another embodiment of the multiplex transmission apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Multiple transmission path 20 ... Actuator node 21 ... Communication chip (CAN) 22 ... CPU 23 ... Actuator 40 ... Control node 41 ... Communication chip (CAN) 42 ... CPU 50, 55 ... System down dedicated line

──────────────────────────────────────────────────続 き Continuation of the front page (72) Minehito Shibata 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Corporation (56) References JP-A-3-139939 (JP, A) Field surveyed (Int.Cl. ⁶ , DB name) H04L 12/40

Claims (5)

(57) [Claims] 1. An actuator connected to a multiplex transmission line.
Having a communication chip, and receiving through the communication chip.
Drive the actuator based on the communication data
And because the actuator nodes, a control node sends a system down signal for the actuator node upon detection of a failure of the failure or the actuator node of the multiplex transmission path, wherein between said control node and the actuator node multiplexing It is tied separately from the transmission line and the communication chip
The actuator remains active even when
A dedicated system down line for transmitting the system down signal sent from the control node so as to forcibly stop the operation of the actuator. 2. The multiplex transmission apparatus according to claim 1, wherein said actuator node is connected via said communication chip.
Drives the actuator based on received communication data
And a dedicated system down line is provided by the control node.
The system down signal is given directly to the CPU.
The control knob is used to shut off the power of the actuator.
A multiplex transmission device, comprising a mode and a CPU . 3. The multiplex transmission device according to claim 1, wherein
The control node, the failure of the multiplex transmission line or the access
If no failure of the tutor node is detected,
The operation of the actuator node is controlled via a double transmission path.
A multiplex transmission device characterized by controlling. 4. The multiplex transmission apparatus according to claim 1, wherein said control node is a communication channel connected to said multiplex transmission line.
And the multiplex transmission path obtained via the communication chip
Through the above information, the failure of the multiplex transmission line or the actuation
A CPU for detecting a failure of the eta node , wherein the actuator node is connected via the communication chip.
Drives the actuator based on received communication data
And the dedicated line for system down is connected to the C of the control node.
When the PU is connected to the CPU of the actuator node,
CP of the control node to give a system down signal
U is directly connected to the CPU of the actuator node
A multiplex transmission device, characterized in that: 5. The multiplex transmission apparatus according to claim 1, wherein a plurality of said actuator nodes are provided, and said control node is provided with said multiplex transmission line and said plurality of access nodes.
Collectively monitor the presence or absence of a failure in the tutor node, and
Said system for each of a number of actuator nodes
It is connected by a down line
Multiplex transmission equipment.