JPH08307967A - Multiplex transmission system - Google Patents

Abstract

PURPOSE: To provide a multiplex transmission system with a master/slave system which is capable of speedily detecting the abnormality and fault of a master node and a slave node to surely execute this countermeasure and in which wire harness is comparatively little and an equipment and a control program are simple so as to reduce a cost. CONSTITUTION: Whether a response data value from each slave node 12a to 12n to a data transmission instruction from the side of the master node 11 is within a regulated value for each kind of data previously stored in the memory 110 of the master node 11 is judged by the master node 11 in the multiplex transmission system 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission system, and more particularly, to a master system used for on-board diagnosis of a control system for controlling an engine of a car, a vehicle speed, etc. The present invention relates to a slave node type multiplex transmission system.

[0002]

2. Description of the Related Art An automobile is equipped with a large number of control systems for performing complicated control relating to an engine, vehicle speed, transmission, suspension, steering, etc. This control system includes a CPU (Central Processing Unit),
It is configured by connecting a sensor, an actuator, and the like to a node including an input / output interface, a memory, and the like. In addition, each control system controls based on the data of the control system itself and the data from other control systems, and the data is transmitted between the nodes via the wire harness. ing. This data transmission includes a parallel transmission system and a multiplex transmission (serial transmission) system. The parallel transmission system can transmit a large amount of data at a high speed at one time, but it requires a large number of wire harnesses, which increases the weight of the vehicle and makes the wiring work troublesome. On the other hand, the multiplex transmission system is a system in which, for example, one data signal having an 8-bit structure is temporarily decomposed and sequentially transmitted one bit at a time through a bus. Although the transmission speed is relatively slow, the wire harness is basically one. There is a merit that a book is good. Therefore, a multiplex transmission system is mainly used for data transmission between nodes such as automobiles. A diagnostic system using this multiplex transmission system is CSMA / CD (Carrier).
The Sense MultipleAcess with Collision Detection) method and the master / slave method are well known. C
The SMA / CD system is a relatively advanced multiplex transmission system that enables communication between nodes, but there is a problem in that each node must be equipped with a communication IC, which increases costs. In order to deal with this problem, the master / slave system has recently been reviewed.

FIG. 1 is a block diagram schematically showing a conventional master / slave type multiplex transmission system of this type. In the figure, 32a to 32n control the engine, vehicle speed, transmission, suspension, steering and the like. Each shows a slave node. Each slave node 32a-32n has a memory 320a-320n.
, CPU, I / O interface (neither shown)
And the like, and the memories 320a to 320n.
A control program (not shown) and the like for controlling the slave nodes 32a to 32n are stored in. Further, each slave node 32a to 32n has a plurality of sensors 321.
1a to 3211n and actuators 3212a to 32
It is connected to the control units 321a to 321n such as 12n, and is also connected to the master node 31 via the bus 33. The master node 31 includes a memory 310, a CPU, an input / output interface (both not shown), etc., and the memory 310 has a control program (not shown) for controlling the entire multiplex transmission system 30. Etc. are stored. Master node 31
Is connected to the failure indicator lamp 311. A master / slave multiplex transmission system 30 is configured by including the master node 31, the slave nodes 32a to 32n, the control units 321a to 321n, the bus 33, the failure display lamp 311, and the control program.

The multiplex transmission system 3 configured in this way
At 0, the slave nodes 32a to 32n are controlled based on the control programs stored in the memories 320a to 320n, and the control units 321a to 3n are controlled.
21n etc. abnormalities and failure states are detected, and this is the memory 3
20a to 320n. Also master node 3
When an inquiry about the presence / absence of a communication request or an instruction to transmit data is made via the bus 33 based on the control program stored in the memory 310, the slave nodes 32a to 32n send data to the master node 3 via the bus 33.
1, the response data is transmitted, and the master node 31 controls the entire multiplex transmission system 30 based on the response data and the control program. In the master node 31, the response data is transmitted to the slave node 3
When it is determined that the data is data for reporting an abnormality or a failure in the 2a to 32n system, the failure display lamp 311 is turned on, which allows the driver to confirm the occurrence of the failure or the failure.
Also, connect a tester 34 to the multiplex transmission system 30,
When this is instructed to transmit data, the memory 320
The failure data stored in a to 320n is the tester 34.
Will be called up on the display section, so that the car can be easily and surely repaired while watching this.

[0005]

The above-described conventional multiplex transmission system 30 has the advantages that the number of wire harnesses wired as described above is small, the device is relatively simple, and the cost is low. But Masternode 3
The slave node 32a to 32n does not make an inquiry to the slave nodes 32a to 32n about abnormalities or failure states, and the slave nodes 32a to 3n are exchanged by exchanging data a plurality of times.
Since the occurrence of a failure in the 2n system is detected in the master node 31, there is a possibility that the failure countermeasure may be delayed.

Further, even if any of the slave nodes 32a to 32n fails and abnormal data is transmitted to the master node 31, it is difficult for the master node 31 to immediately determine that this is abnormal, and this abnormal data remains unchanged. There is a possibility that the data may be transmitted to the slave nodes 32a to 32n and erroneous control may be performed. Further, there is a problem that it is difficult to detect the failure of the master node 31 itself.

Further, the transmission data on the bus 33 is congested, and the master node 31 to the slave nodes 32a to 32a.
Even if a data transmission instruction is given to 2n, a waiting time is likely to occur until the bus 33 becomes vacant in the slave nodes 32a to 32n, which may delay the response to an emergency situation.

Further, even if the master node 31 detects that a failure has occurred in any of the slave nodes 32a to 32n, this fact also occurs.
32n not immediately transmitted to slave node 32
There is a possibility that an error may occur in the control of a to 32n.

Further, when any of the slave nodes 32a to 32n fails, it is difficult to take sufficient measures.

The present invention has been made in view of the above problems, and it is possible to quickly detect an abnormality or a failure of a master node or a slave node, and it is possible to surely implement this countermeasure, and to wire harness. It is an object of the present invention to provide a master / slave-type multiplex transmission system in which the number of devices is relatively small, the device and control program are simple, and the cost can be reduced.

[0011]

In order to achieve the above object, a multiplex transmission system according to the present invention is a multiplex transmission system based on a master / slave system via a bus between a master node and a plurality of slave nodes. In, whether the response data value from each slave node to the data transmission instruction from the master node side is within the specified value for each data type stored in advance in the memory of the master node. It is characterized in that it is configured to be judged by the master node (1).

Further, the multiplex transmission system according to the present invention is a multiplex transmission system based on a master / slave system via a bus between a master node and a plurality of slave nodes, in which memories of the master node and the slave nodes are previously stored. When the slave node itself determines that the slave node is out of order while the specified value for each data type is stored in the slave node, the slave node responds to the data transmission instruction from the master node side to the slave node side. It is characterized in that response data outside the specified value is transmitted from the node side to the master node side (2).

Further, the multiplex transmission system according to the present invention is a multiplex transmission system based on a master-slave system via a bus between a master node and a plurality of slave nodes, wherein the master node and each of these slave nodes are It is characterized in that it is connected via another signal line besides the bus (3).

Further, the multiplex transmission system according to the present invention is a multiplex transmission system based on a master / slave system via a bus between a master node and a plurality of slave nodes, wherein from the master node side to each slave node side. It is characterized by being able to inquire about the failure status on a regular basis (4).

Further, the multiplex transmission system according to the present invention is a multiplex transmission system based on a master / slave system via a bus between a master node and a plurality of slave nodes. In addition, the malfunction detection data and the instruction data for returning the malfunction detection data as they are are transmitted (5).

Further, in the multiplex transmission system according to the present invention, in the multiplex transmission system based on the master / slave system via a bus between a master node and a plurality of slave nodes, a failure occurs in any of these slave nodes. If the master node judges that the above has occurred, the master node transmits this fact to each of the slave nodes via a failure data frame (6).

Further, in the multiplex transmission system according to the present invention, in a multiplex transmission system based on a master / slave system via a bus between a master node and a plurality of slave nodes, a failure occurs in any of these slave nodes. If the master node determines that the master node has failed, the master node transmits this to each slave node via a failure data frame, and the master node fails the default data in place of the data of the failed slave node. Is transmitted to a slave node other than the slave node in which (7) has occurred.

Further, the multiplex transmission system according to the present invention is a multiplex transmission system based on a master / slave system via a bus between a master node and a plurality of slave nodes. When the master node determines that a failure has occurred in any of these slave nodes while storing default data in place of the data of the node in advance, the master node notifies the master node of the failure via the failure data frame. Along with transmitting to the slave node, the master node transmits a switching instruction to the default data of the slave node in which the failure has occurred to a slave node other than the slave node in which the failure has occurred. (8).

[0019]

According to the multiplex transmission system (1) having the above structure,
In the master node, whether or not the response data value from each slave node in response to the data transmission instruction from the master node side is within the specified value for each data type stored in advance in the memory of the master node. Since it is configured to be judged, if the response data value is out of the specified value for each data type, the master node is notified that some abnormality has occurred in the slave node that has transmitted this response data value. Immediately at
And it can be detected easily.

Further, according to the multiplex transmission system (2) having the above-mentioned structure, the specified value for each data type is stored in the memories of the master node and the slave node in advance, and if the slave node is out of order, the slave node fails. When it judges itself, in response to a data transmission instruction from the master node side to the slave node side, response data outside the specified value is transmitted from the slave node side to the master node side. , The master node can easily and surely determine that the response data is out of the specified value, and immediately detects that an abnormality has occurred in the control unit of the slave node that has transmitted the response data. It will be possible.

Further, according to the multiplex transmission system (3) having the above-mentioned configuration, since the master node and each slave node are connected via another signal line in addition to the bus, even if the bus is congested, Response data can be immediately transmitted from the slave node to the master node via the other signal line, and an emergency can be dealt with quickly.

Further, according to the multiplex transmission system (4) having the above-mentioned configuration, since the master node side periodically inquires of each slave node side about the failure state, any one of these slave nodes is in trouble. When it occurs, the slave node transmits the response data with the ID code indicating the failure to the master node in good timing,
In addition, reliable transmission can be performed, and as a result, failure countermeasures can be promptly performed in the master node without omission.

Further, according to the multiplex transmission system (5) having the above configuration, from the master node side to each slave node side,
Since the malfunction detection data and the instruction data for returning the malfunction detection data as it is are transmitted, the response data returned from all of these slave nodes is different from the malfunction detection data. When the master node determines that the abnormality is present, it is possible to easily and surely detect that the master node itself has an abnormality. Further, when the master node determines that the response data returned from a part of these slave nodes is different from the malfunction detection data, it is easy and sure that the slave node has an abnormality. It will be detectable.

Further, according to the multiplex transmission system (6) having the above-mentioned configuration, when the master node judges that a failure has occurred in any of the slave nodes, the master node notifies the slave node via the failure data frame. Since the data is transmitted to the nodes, the data of the slave node in which a failure has occurred in these slave nodes can be immediately eliminated, and the error in control can be prevented.

Further, according to the multiplex transmission system (7) having the above-mentioned configuration, when the master node judges that a failure has occurred in any of the slave nodes, the master node notifies the slave node via the failure data frame. Since the master node transmits default data in place of the data of the slave node in which the failure has occurred to the slave nodes other than the slave node in which the failure has occurred, the failure in these slave nodes occurs. It is possible to immediately eliminate the data of the slave node in which the error occurred, prevent an error in the control, and surely continue the control based on the default data. Therefore, the automobile can be safely driven.

Further, according to the multiplex transmission system (8) having the above-mentioned configuration, the default data replacing the data of each slave node is stored in advance in the memory of each slave node, and any one of these slave nodes fails. When the master node determines that a failure has occurred, the master node transmits this to each of the slave nodes via a failure data frame, and sends an instruction to switch the default data of the failed slave node to the master node. Since the node is designed to transmit to slave nodes other than the slave node in which the failure has occurred, the amount of data to pass through the bus can be reduced, so that control based on the default data can be quickly switched, and the automobile It will be possible to drive more safely.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a multiplex transmission system according to the present invention will be described below with reference to the drawings. Note that components having the same functions as those of the conventional example are denoted by the same reference numerals. FIG. 1 is a block diagram schematically showing a master / slave multiplex transmission system according to the present invention.
Reference numerals 2a to 12n denote slave nodes for controlling the engine, vehicle speed, transmission, suspension, steering, etc., respectively. Each slave node 12
a to 12n are configured to include memories 120a to 120n, a CPU, an input / output interface (both not shown), and the like, and the memories 120a to 120n each include a control program for controlling the slave nodes 12a to 12n. (Not shown) and the like are stored. Further, each of these slave nodes 12 a to 12 n is connected to the master node 11 via a bus 33. The master node 11 is configured to include a memory 110, a CPU, an input / output interface (both not shown), and the like.
A control program (not shown) for controlling the entire multiplex transmission system 10 and the like are stored in. Since other configurations are similar to those of the conventional multiplex transmission system 30 shown in FIG. 1, detailed description thereof will be omitted here. These master node 11 and slave node 12a
-12n, control units 321a-321n, bus 3
3. A master / slave multiplex transmission system 10 is configured including a control program and the like.

The multiplex transmission system 1 configured as described above
0, as in the conventional multiplex transmission system 30 shown in FIG. 1, the slave nodes 12a to 12n are controlled based on the control programs stored in the memories 120a to 120n, and the control units 321a to 321 are controlled.
An abnormality such as n or a failure state is detected, and this is detected by the memory 120.
a to 120n. Further, based on the control program stored in the memory 110 from the master node 11,
When an inquiry about the presence or absence of a communication request or a data transmission instruction is issued via the bus 33, the slave node 12
Response data is transmitted from a to 12n to the master node 11 via the bus 33. Then, based on this response data and the control program, the master node 11 controls the entire multiplex transmission system 10. When the master node 11 determines that the response data is data that conveys an abnormality or a failure of the slave nodes 12a to 12n, the failure display lamp 311 is turned on, whereby the driver can confirm the occurrence of the abnormality or the failure. You can When a tester 34 is connected to the multiplex transmission system 10 and a data transmission instruction is given to the multiplex transmission system 10, abnormal or failure data stored in the memories 120a to 120n is called up on the display unit of the tester 34. However, the car can be easily and reliably repaired.

The operation of the master node 11 and the slave nodes 12a to 12n other than the above will be described below for each embodiment with reference to FIG.

The multiplex transmission system according to the first embodiment will be described below. FIG. 2 is a flowchart schematically showing the multiplex transmission system according to the first embodiment, in which the left side shows the operation of the master node and the right side shows the operation of the slave node. When the system is activated, first the master node 1
In step 1, it is determined whether or not to instruct a specific slave node to transmit data (S (step) 1). If it is determined that no instruction is given, the process returns to the original state. Data signal T1 based on ID code
Is transmitted (S2). Then slave node 12a ~
In 12n, it is determined whether or not the signal T1 is received (S3). If it is determined that the signal T1 is not received, the process returns to the original state. If it is determined that the signal T1 is received, the signal T1 is received in S4.
It is determined whether or not 1 is for its own node. Then, when it is determined that it is not for its own node, the operation is terminated, and when it is determined that it is for its own node, the response data signal T2 regarding the instruction content is transmitted to the master node 11 via the bus 33 ( S5), the operation ends. Next, in the master node 11, it is determined whether or not the response data signal T2 is received (S6). If it is determined that the response data signal T2 is not received, the process returns to the original state, while if it is determined that it is received,
In S7, it is determined whether or not the response data signal T2 is from the specific slave node. Then, when it is determined that it is not from the specific slave node, the processing returns to S6, while when it is determined that it is from the specific slave node,
A prescribed value (for example, “vehicle speed 180 km / hr or less”) stored in advance in the memory 110 is called (S8). Next, in S9, it is determined whether or not this response data is within the specified value. If the response data is, for example, 100 km / hr, it is within the specified value, so it is determined to be normal and normal processing is performed. on the other hand,
When the response data is, for example, 200 km / hr, it is determined that the slave node itself is abnormal, and the failure handling process for this slave node is performed.

As is clear from the above description, in the multiplex transmission system 10 according to the first embodiment, the response data value (200
km / hr) is the specified value of the data type (vehicle speed) (180
If less than (km / hr or less), it is possible for the master node 11 to immediately and easily detect that some abnormality has occurred in the slave node that has transmitted this response data.

Next, a multiplex transmission system according to the second embodiment will be described. FIG. 3 is a flowchart schematically showing a part of the operation of the slave node in the multiplex transmission system according to the second embodiment. The operation up to S4 is similar to that shown in FIG. 2, and it is determined whether or not the control units 321a to 321n are abnormal in the slave nodes 32a to 32n (S11).
Move to S5 shown in. On the other hand, when it is determined that there is an abnormality, a specified value (for example, “vehicle speed 180
"km / hr or less") is called (S12). Next, a fixed value (for example, 20 km / hr) is added to this specified value (S13), and this additional data (for example, 180 + 20 = 2)
The signal T2 of 00 km / hr) is transmitted to the master node 11 via the bus 33 (S14). Then, the operation after S6 is performed in the master node 11.

As is apparent from the above description, in the multiplex transmission system 10 according to the second embodiment, the response data (200 km / hr) in the master node 11 is the specified value (18).
The deviation from 0 km / hr) can be easily and surely determined, and it is possible to immediately detect that an abnormality has occurred in the control unit or the like of the slave node that has transmitted this response data.

Next, a multiplex transmission system according to the third embodiment will be described. As shown in FIG. 1, the slave nodes 22a to 22n are directly connected to an interrupt terminal (not shown) of the CPU in the master node 21 via another signal line 23 in addition to the bus 33. Since other configurations are similar to those of the multiplex transmission system 10, detailed description thereof will be omitted here. The multiplex transmission system 20 includes the master node 21, the slave nodes 22a to 22n, the control units 321a to 321n, the bus 33, the signal line 23, and the control program. FIG. 4 is a flowchart schematically showing the multiplex transmission system according to the third embodiment, in which the left side shows the operation of the master node and the right side shows the operation of the slave node. S1
The operation up to 1 is substantially the same as that shown in FIG. 3, and it is determined whether or not the slave node 22a to 22n is abnormal in its own unit (S11), and if it is determined not to be abnormal, S5 shown in FIG. Move to. On the other hand, if it is determined to be abnormal, the error signal T3 is immediately output to the interrupt terminal of the master node 21 via the signal line 23. Then, the master node 21 determines whether or not the signal T3 is an error signal (S22). If it is determined that the signal is not an error signal, the process returns to S1 shown in FIG. Processing is performed.

As is apparent from the above description, in the multiplex transmission system according to the third embodiment, even if the bus 33 is congested, the slave nodes 22a to 22a-2 are routed via another signal line 23.
The response data T3 can be immediately transmitted from the 2n to the master node 21, and an emergency can be dealt with promptly.

In the third embodiment, the case where one end of the signal line 23 is connected to the interrupt terminal of the CPU in the master node 21 has been described. In another embodiment, the general input port of the CPU is described. May be connected to.

Next, a multiplex transmission system according to the fourth embodiment will be described. FIG. 5 is a flow chart schematically showing the multiplex transmission system according to the fourth embodiment, in which the left side shows the operation of the master node and the right side shows the operation of the slave node. When the system is activated, first the master node 1
In 1 the timer (not shown) is reset and at the same time the time starts to be counted (S31), then it is judged in S32 whether the predetermined inquiry time has come, and it is judged that the predetermined time has not come. And return to the original.
On the other hand, when it is determined that the predetermined time has come, as shown in FIG. 6, the inquiry data signal T4 of the failure state based on the ID code is transmitted via the bus 33 to the slave nodes 12a ...
It is transmitted to 12n (S33). Then, it is determined whether the slave nodes 12a to 12n have received the data signal T4 (S34). If it is determined that the data signal T4 is not received, the process returns to the original state, and if it is determined that the data signal T4 is received, S35 is performed.
At, it is determined whether or not the data signal T4 is an inquiry about a failure state. If it is determined that the inquiry is not the failure state, the process returns to S34. If it is determined that the inquiry is the failure state, the timer (not shown) is reset and the time starts to be counted (S36).
Next, in S37, it is determined whether or not the response time of the own node has been reached. If it is determined that the response time has not come, the process returns to the original state, and if it is determined that the response time has come, as shown in FIG. Then, the response data T5 regarding the failure state of the own unit is transmitted to the master node 11 via the bus 33 (S38). Next, in S39, it is determined whether or not an ignition switch (not shown) is off. If it is determined that the ignition switch is not off, the process returns to S34, while if it is determined that it is off, the slave node 1
The operations of 2a to 12n are completed. On the other hand, the master node 11 determines whether or not the response data T5 has been received (S40). If it is determined that the response data T5 has not been received, the process returns to the original state. It is determined whether or not the nodes 12a to 12n have a failure. If it is determined that a failure has occurred in the slave node 12b, as shown in FIG. 6, for example, failure handling processing is performed (S42), and then the process proceeds to S43. On the other hand, if it is determined that the slave nodes 12a to 12n have no failure, the process proceeds to S43 and S4.
In 3, it is determined whether or not the ignition switch is off, and if it is determined that the ignition switch is not off, S
While returning to 32 and repeating again, when it is determined that the master node 11 is off, the operation of the master node 11 ends.

As is apparent from the above description, in the multiplex transmission system according to the fourth embodiment, these slave nodes 12 are
When an abnormality occurs in, for example, the slave node 12b among a to 12n, the response data T5 indicating the failure can be transmitted from the slave node 12b to the master node 11 in a timely and reliable manner. It is possible to take quick countermeasures against failures without omission.

In the fourth embodiment, the response data T5
Is transmitted to the master node 11 via the bus 33, but in another embodiment, the response data T5 may be transmitted via the signal line 23.

Next, a multiplex transmission system according to the fifth embodiment will be described. FIG. 7 is a flowchart schematically showing the multiplex transmission system according to the fifth embodiment, in which the left side shows the operation of the master node and the right side shows the operation of the slave node. When the system is activated, first the master node 1
In step 1, it is determined whether the malfunction detection is executed (S
51), if it is determined not to execute, the process returns to the original state, and if it is determined to execute, the return instruction signal T6 of the malfunction detection data is transmitted via the bus 33 to the slave nodes 12a to 12a.
n (S52). Then slave node 12
It is determined whether or not the signal T6 is received in a to 12n (S53), and if it is determined that the signal is not received, the process returns to the original state, while if it is determined that the signal is received, the process proceeds to S55. Then, the master node 11 transmits the signal T7 of the malfunction detection data D1 and D2 as shown in FIG. 8 (S5).
4). Then, the slave nodes 12a to 12n determine whether or not the signal T7 is received (S55). If it is determined that the signal T7 is not received, the process returns to the original state. If it is determined that the signal T7 is received, the malfunction detection data D1 is received. , D2 are returned as they are to the master node 11 via the bus 33 (S56). Next, the master node 11 determines whether or not the return signals T8 from all the slave nodes 12a to 12n have been received. If it is determined that they have not been received, the process returns to the original state, and if it is determined that they have been received. Proceed to S58.
Next, in S58, it is determined whether or not all the return signals T8 and the malfunction detection data D1 and D2 are equal. If it is determined that they are equal, an abnormality occurs in the input / output circuits of the master node 11 and all slave nodes 12a to 12n. If it is determined that they are not equal to each other and normal processing is performed, if it is determined that they are not equal to each other, then at S59, it is determined whether or not all the return signals T8 are different from the malfunction detection data D1 and D2. If, for example, the third bit of all slave nodes 12a to 12n is fixed to "0" as shown in FIG. 8A, it is possible that the third bit of the master node 11 has a failure. Determination is made, and abnormality handling processing such as switching to a spare master node is performed. On the other hand, all the return signals T8 are the malfunction detection data D1 and D.
If it is determined that the return signal T8 of the slave node is not different from that of the slave node 12 (not shown), as shown in FIG. If the bit is fixed at "0",
It is probabilistically determined that this is a failure, and an abnormality handling process for the slave node 12b is performed.

As is clear from the above description, in the multiplex transmission system according to the fifth embodiment, all slave nodes 12 are
When the master node 11 determines that the response data T8 returned from a to 12n is different from the malfunction detection data D1 and D2, it is possible to easily and surely detect that the master node 11 itself has an abnormality. can do. The response data T8 returned from the slave node 12b among the slave nodes 12a to 12n.
When the master node 11 determines that is different from the malfunction detection data D1 and D2, it is possible to easily and surely detect that the slave node 12b is abnormal.

In the fifth embodiment, the response data T8
Has been described as being returned to the master node 11 via the bus 33, but in another embodiment, the response data T8 may be returned via the signal line 23.

In the fifth embodiment, the malfunction detection data D1 and D2 are "1010 ...", "0101 ...".
However, the present invention is not limited to this. For example, “1111 ...”, “0000
... ".

Next, a multiplex transmission system according to the sixth embodiment will be described. FIG. 9 is a flow chart schematically showing the multiplex transmission system according to the sixth embodiment, in which the left side shows the operation of the master node and the right side shows the operation of the slave node. When the system is activated, the master node 11 determines whether or not to transmit fault data (S6).
1) If it is determined not to transmit, the process returns to the original, while if it is determined to transmit, the fault data T9 is transmitted to the slave nodes 12a to 12n via the fault data frame (S62). FIG. 10 is a diagram schematically showing this failure data frame. The failure data frame is composed of failure data for each of the slave nodes 12a to 12n,
For example, with ID code X, this frame causes failure data T
It turns out that it is 9. Then, it is determined whether or not the failure data T9 is received in the slave nodes 12a to 12n (S63). If it is determined that the failure data T9 is not received, the process returns to the original state. It is determined whether or not a failure has occurred in the nodes 12a to 12n. If it is determined that no failure has occurred, normal processing is performed. On the other hand, for example, FIG.
When "1" is displayed in the second bit of the ID code Y as shown in Fig. 7 and it is detected / determined that a failure has occurred at a specific location corresponding to this bit in the slave node 12b, the process proceeds to S70. move on. Next master node 1
1, it is determined whether or not a failure has occurred in the slave nodes 12a to 12n (S65). If it is determined that no failure has occurred, normal processing is performed, while, for example, a failure has occurred in the slave node 12b. If it is determined that the slave node 12b is further transmitted from the master node 11 (S66). Next, the default data stored in advance is called from the memory 110 (S67), it is determined in S68 whether or not this default data replaces the data of the slave node 12b, and if it is determined that they are different, S67 is executed. Return to. On the other hand, when it is determined that the data is the default data of the slave node 12b, the signal T10 of this default data is transmitted via the bus 33 to the slave nodes 12a, 12c to 12n.
(S69). Then slave node 12
a, 12c to 12n, it is determined whether or not the default data has been received (S70). If it is determined that the default data has not been received, the process returns to the original state, and if it is determined that the default data has been received, S is performed.
Proceed to 73. Next, in the master node 11, it is determined whether or not the output A of the slave node 12c related to the slave node 12b is turned off (S71). Then, the signal T11 instructing to turn off is transmitted to the slave node 12c via the bus 33 (S7).
2), the operation of the master node 11 ends. Then, the signal T1 is transmitted from the slave nodes 12a and 12c to 12n.
It is determined whether or not 1 has been received (S73), and if it is determined that it has not been received, the process returns to the original state.
It is determined whether or not it is 2c. And the slave node 12
If it is determined that the slave node 12c is not the slave node 12c, the output A is turned off.

As is apparent from the above description, in the multiplex transmission system according to the sixth embodiment, the slave nodes 12a, 1
Slave node 1 in which a failure occurs in 2c to 12n
The data of 2b can be immediately eliminated, and an error in control can be prevented.

Also, the slave nodes 12a, 12c-1
It is possible to immediately eliminate the data of the slave node 12b in which the failure occurs in 2n, prevent an error from occurring in the control, and reliably continue the control based on the default data T10. Therefore, the vehicle can be safely driven.

In the sixth embodiment, the case where the slave node 12b fails has been described, but it goes without saying that the present invention can be applied to the case where any of the slave nodes 12a and 12c to 12n fails.

Next, a multiplex transmission system according to the seventh embodiment will be described. FIG. 11 is a flowchart schematically showing the multiplex transmission system according to the sixth embodiment, in which the left side shows the operation of the master node and the right side shows the operation of the slave node. The operation up to S66 is similar to that shown in FIG.
The signal T12 for instructing switching to the default data instead of the data of b is the slave nodes 12a, 12c to 12n.
(S81) and the process proceeds to S71. Then, the slave nodes 12a, 12c to 12n determine whether or not the signal T12 is received. If it is determined that the signal T12 is not received, the process returns to the original state. If it is determined that the signal T12 is received, the default stored in advance is stored. Data is stored in the memories 120a, 120
It is called from c to 120n (S83). Then S84
It is determined whether or not the default data called in step 1 is for the instructed slave node 12b. If it is determined to be different, the process returns to S83, whereas if it is determined to be for the slave node 12b, the process proceeds to step S73.

As is apparent from the above description, in the multiplex transmission system according to the seventh embodiment, the amount of data to be passed through the bus 33 can be reduced, so that the control can be quickly switched to the control based on the default data and the automobile can be controlled. You can drive more safely.

[0050]

As described above in detail, in the multiplex transmission system (1) according to the present invention, the response data value from each slave node in response to the data transmission instruction from the master node side is the master node. Since the master node is configured to judge whether or not the response data value is within the specified value for each data type stored in advance in the memory, the response data value is determined from the specified value for each data type. If it is deviated, it is possible for the master node to immediately and easily detect that some abnormality has occurred in the slave node that has transmitted this response data value.

The multiplex transmission system (2) according to the present invention
In this case, the specified values for each data type are stored in advance in the memories of the master node and the slave node, and when the slave node itself determines that the slave node has a failure, the slave node from the master node side. In response to the data transmission instruction to the node side, since the response data outside the specified value is transmitted from the slave node side to the master node side, the response data in the master node is changed from the specified value. It is possible to judge easily and surely that it is off, and it is possible to immediately detect that an abnormality has occurred in the control unit or the like of the slave node that has transmitted the response data.

The multiplex transmission system according to the present invention (3)
In that case, since the master node and each slave node are connected via another signal line other than the bus, even if the bus is congested, from the slave node via the another signal line. Response data can be immediately sent to the master node, and an emergency can be dealt with quickly.

The multiplex transmission system according to the present invention (4)
In this case, since the master node side periodically inquires of each slave node side about the failure state, if any of these slave nodes fails, the slave node will fail to the master node side. It is possible to transmit the response data based on the ID code representing the time code with certainty, and as a result, it is possible to promptly take a failure countermeasure in the master node without omission.

The multiplex transmission system (5) according to the present invention
In that case, since the malfunction detection data and the instruction data for returning the malfunction detection data as they are are transmitted from the master node side to each slave node side, all slave nodes are transmitted. When the master node determines that the returned response data is different from the malfunction detection data, it is possible to easily and surely detect that the master node itself has an abnormality. Further, when the master node determines that the response data returned from a part of these slave nodes is different from the malfunction detection data, it is easy and sure that the slave node has an abnormality. Can be detected.

The multiplex transmission system (6) according to the present invention
In this case, when the master node determines that a failure has occurred in any of the slave nodes, the master node transmits this to each slave node via a failure data frame. Data in the slave node in which a failure has occurred in the slave node can be immediately eliminated, and an error in control can be prevented.

The multiplex transmission system according to the present invention (7)
In this case, when the master node determines that a failure has occurred in any of the slave nodes, the master node transmits this to each slave node via a failure data frame, and the slave in which the failure has occurred Since the master node transmits default data in place of the data of the node to slave nodes other than the slave node in which the failure has occurred, the data of the slave node in which the failure has occurred is immediately eliminated in these slave nodes. Therefore, it is possible to prevent the control from being erroneous and to surely continue the control based on the default data. Therefore, the vehicle can be safely driven.

Further, according to the multiplex transmission system (8) having the above configuration, the default data replacing the data of each slave node is stored in the memory of each slave node in advance, and any one of these slave nodes fails. When the master node determines that a failure has occurred, the master node transmits this to each of the slave nodes via a failure data frame, and sends an instruction to switch the default data of the failed slave node to the master node. Since the node is designed to transmit to slave nodes other than the slave node in which the failure has occurred, the amount of data passing through the bus is smaller than that of the multiplex transmission system (7), and the transmission speed is increased. Can quickly switch to control based on the default data It can be more safely traveling in the car.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing an embodiment and a conventional master-slave multiplex transmission system.

FIG. 2 is a flowchart schematically showing the operation of a node of the multiplex transmission system according to the first embodiment, in which the left side shows the operation of the master node and the right side shows the operation of the slave node.

FIG. 3 is a flowchart schematically showing a part of the operation of a slave node in the multiplex transmission system according to the second embodiment.

FIG. 4 is a flowchart schematically showing a multiplex transmission system according to a third embodiment, in which the left side shows the operation of a master node and the right side shows the operation of a slave node.

FIG. 5 is a flowchart schematically showing a multiplex transmission system according to a fourth embodiment, in which the left side shows the operation of a master node and the right side shows the operation of a slave node.

FIG. 6 is a diagram schematically showing the timing of a master node failure status inquiry and the response of each slave node in the multiplex transmission system according to the fourth embodiment.

FIG. 7 is a flowchart schematically showing a multiplex transmission system according to a fifth embodiment, in which the left side shows the operation of a master node and the right side shows the operation of a slave node.

FIG. 8 is a diagram schematically showing malfunction detection data from the master node and response data returned from the slave node in the multiplex transmission system according to the fifth embodiment, and FIG. In this case, (b) shows the case where the slave node 12b is abnormal.

FIG. 9 is a flowchart schematically showing a multiplex transmission system according to a sixth embodiment, in which the left side shows the operation of a master node and the right side shows the operation of a slave node.

FIG. 10 is a diagram schematically showing a failure data frame in the multiplex transmission system according to the sixth embodiment.

FIG. 11 is a flowchart schematically showing a multiplex transmission system according to a seventh embodiment, in which the left side shows the operation of the master node and the right side shows the operation of the slave node.

[Explanation of symbols]

 10 multiplex transmission system 11 master node 110 memory 12a-12n slave node 33 bus

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F02D 45/00 380 H04L 11/00 321

Claims (8)

[Claims] 1. In a multiplex transmission system based on a master / slave system via a bus between a master node and a plurality of slave nodes, a response from each slave node to a data transmission instruction from the master node side. Multiplex transmission, wherein the master node is configured to judge whether or not the data value is within a specified value for each data type stored in advance in the memory of the master node. system. 2. In a multiplex transmission system based on a master-slave system via a bus between a master node and a plurality of slave nodes, a specified value for each data type is previously stored in the memories of the master node and the slave node. When the slave node itself determines that the slave node has been stored and has failed, the slave node side to the master node side in response to a data transmission instruction from the master node side to the slave node side. A multiplex transmission system characterized in that response data out of the specified value is transmitted. 3. In a multiplex transmission system based on a master-slave system via a bus between a master node and a plurality of slave nodes, the master node and each of these slave nodes are provided with signal lines other than the bus. A multiplex transmission system, characterized in that the multiplex transmission system is connected via. 4. In a multiplex transmission system based on a master-slave system via a bus between a master node and a plurality of slave nodes, the master node side periodically inquires of these slave node sides about a failure state. A multiplex transmission system, which is characterized in that 5. In a multiplex transmission system via a bus between a master node and a plurality of slave nodes based on a master-slave system, malfunction detection data and the data for detecting malfunctions are transmitted from the master node side to each slave node side. A multiplex transmission system characterized in that instruction data for returning the malfunction detection data as it is is transmitted. 6. In a multiplex transmission system via a bus between a master node and a plurality of slave nodes based on a master / slave system, when the master node determines that a failure has occurred in any of these slave nodes. A multi-transmission system in which the master node transmits this to each of the slave nodes via a failure data frame. 7. In a multiplex transmission system based on a master-slave system via a bus between a master node and a plurality of slave nodes, the master node determines that any one of these slave nodes has failed. , While the master node transmits this to each of the slave nodes via a failure data frame,
A multiplex transmission system, wherein the master node transmits default data in place of the data of the slave node in which a failure has occurred to the slave nodes other than the slave node in which the failure has occurred. 8. In a multiplex transmission system via a bus between a master node and a plurality of slave nodes based on a master / slave system, default data replacing the data of each slave node is stored in the memory of each slave node. When the master node determines that a failure has occurred in any of these slave nodes while being stored in advance, the master node transmits this to each slave node via a failure data frame, and the failure occurs. In the multiplex transmission system, the master node transmits an instruction to switch the slave node to the default data, which has occurred, to a slave node other than the slave node in which the failure has occurred.