JPH1023045A - Vehicle data transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make efficient a bus occupancy rate of each node on a network. SOLUTION: Each of nodes 1a-1e in the vehicle data transmission system is configured, such that a token is circulated in a predetermined order among the nodes 1a-1e and a node acquiring the token sends a plurality of data to a bus 3. In this case, a token transfer destination setting means 23a sets a token transfer destination node, a group data setting means 32a sets sequentially each of relational data of group data, consisting of some relational data related to each other in a plurality of the data in a same frame, a transmission reception means 21a sends a token transfer message to the token transfer destination node and sequentially sends several relational data in the same frame set in advance to the token transfer destination node.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of nodes mounted on a vehicle connected to a bus, circulating a transmission right between the nodes in a predetermined order, and a node acquiring the transmission right being connected to the bus. The present invention relates to a vehicle data transmission system for transmitting data to a vehicle, and more particularly to a vehicle data transmission system capable of increasing the efficiency of occupancy of a bus 3 for data to be transmitted.

[0002]

2. Description of the Related Art In a vehicle such as an automobile, a plurality of electronic control nodes (units) are connected to a common bus, and data is transmitted and received between the nodes. In this case, a token passing method is known in which the transmission right is circulated between the nodes in a predetermined order, and the node that has acquired the transmission right sends data to the bus.

[0003] As a technique of a vehicle data transmission system employing this kind of token passing system, for example, there is one disclosed in Japanese Patent Laid-Open No. 6-269048. JP 6
As described in FIG. 5, the address of the destination node is set to a value obtained by adding the value 1 to the address of the destination node, and a transmission right transfer message is transmitted to the destination node as shown in FIG. 5 (step S111). ).

[0004] Then, it is determined whether or not there is a reception response message of the transmission right transfer message from the transmission destination node (step S113). If there is the reception response message, it is determined that the network is normal (step S11).
5), end the processing.

However, if there is no reception response message, the address of the next destination node is set (step S117), and it is further determined whether or not the set address is equal to the address of the own node (step S1).
19).

If the set address is different from the address of the own node, the process returns to step S111, where a transmission right transfer message is transmitted to the next destination node based on the address of the next destination node. From step S119.

When the set address becomes equal to the address of the own node, the network is determined to be abnormal.

According to such a process, it is possible to determine a system abnormality while performing the token transfer process.

On the other hand, among a plurality of nodes of the conventional vehicle data transmission system using the token passing method, a first node which is related to one node from another node is related to each other.
When transmitting the data ID-1, the second data ID-2, and the third data ID-3 in this order, the transmission is performed according to the flowchart shown in FIG.

First, it is determined whether or not the process has been completed (step S201). If the process is to be performed next, it is determined whether or not the transmission condition of the communication frame of data ID-1 has been completed (step S203). ). Data ID-1
When the transmission condition of the communication frame of the data ID-1 is completed, the communication frame of the data ID-1 is transmitted (step S20).
5).

If the transmission condition of the communication frame of the data ID-1 is not completed, the process goes to step S2 directly.
Proceed to 07.

Further, it is determined whether the transmission condition of the communication frame of the data ID-2 is completed (step S).
207). When the transmission condition of the communication frame of the data ID-2 is completed, the communication frame of the data ID-2 is transmitted (step S209).

If the transmission condition of the communication frame of the data ID-2 is not completed, the process goes to step S2 directly.
Proceed to step 11.

Further, it is determined whether the transmission condition of the communication frame of the data ID-3 is completed (step S).
211). When the transmission condition of the communication frame of the data ID-3 is completed, the communication frame of the data ID-3 is transmitted (step S213).

Finally, after the transmission of the communication frame of data ID-3, or when the transmission condition of the communication frame of data ID-3 is not completed, step S20 is performed.
It returns to the process of 1.

[0016]

However, in the conventional token passing system, even if some data are related to each other, each data is set in an individual communication frame and is individually set in another node. Was sent to.

That is, a communication frame is generated for each data, and the communication frame is transferred onto the bus. Therefore, the occupation rate of the bus by the communication frame is increased, so that the occupation rate of the bus for other data is reduced.

An object of the present invention is to provide a vehicle data transmission system capable of increasing the efficiency of the bus occupancy of each node on a network.

[0019]

The present invention employs the following means in order to solve the above-mentioned problems. The invention as claimed in claim 1, wherein a plurality of nodes are connected to the bus, the transmission right is circulated among the nodes in a predetermined order, and the node which has acquired the transmission right sends a plurality of data to the bus. In the transmission system, each of the nodes may include: a delegation destination setting unit configured to set a delegation destination node of the transmission right; and each related data of group data including some related data among the plurality of data. A group data setting means for sequentially setting in the same frame, and a transmission right transfer message to the transmission right transfer destination node set by the transfer destination setting means; Transmitting and receiving means for sequentially transmitting some related data in the same frame to the delegation destination node.

According to the present invention, the delegation destination setting means sets the delegation destination node of the transmission right, and the group data setting means sets the group data consisting of some related data among the plurality of data. Are sequentially set in the same frame, the transmission / reception means sends a transmission right transfer message to the transmission right transfer destination node set by the transfer destination setting means, and the group data setting means. And sends out some related data in the same frame set in order to the delegation destination node.

That is, since some related data set in the same data frame are alternately transmitted onto the bus, the occupancy of the bus is reduced, and the efficiency of the occupancy of the bus can be increased.

According to a second aspect of the present invention, a unique identification number for identifying the related data is added to each related data of the group data, and the group data setting means is added to each related data. The gist is to set related data in the same frame when the identification number is a predetermined identification value.

Further, the group data setting means can set the related data in the same frame when the identification number added to each related data is a predetermined identification value.

In the invention according to claim 3, the group data setting means sets the related data in the same frame when the count value of the counter is the predetermined identification value. Count each time each related data is set in the same frame,
The gist is to set the count value to an initial value when the count value reaches a predetermined count value.

According to the invention, the group data setting means sets the related data in the same frame when the count value of the counter is the predetermined identification value, and the counter sets the group data setting means in the same frame. Is counted each time each related data is set, and when the count value reaches a predetermined count value, the count value is set to the initial value, so that each related data can be transmitted alternately. The transmission processing of the related data can be repeated a plurality of times.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle data transmission system according to the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 shows a configuration diagram of a first embodiment of a vehicle data transmission system according to the present invention. In the vehicle transmission system shown in FIG. 1, an engine control node 1a, a mission control node 1b, a brake control node 1c, a suspension control node 1d, and an output torque control node 1e are connected to a bus 3 in the network. Necessary data is transmitted and received between each other.

That is, the transmission right is circulated among the nodes 1a to 1e in a predetermined order, and the node which has acquired the transmission right sends the data to the bus 3. Note that another control node 1f exists without being connected to the bus 3.

The engine control node 1a controls the operation of the engine according to the driver's operation of the accelerator pedal or the like. The mission control node 1b controls the automatic transmission according to the driving state of the vehicle.

The brake control node 1c performs brake control by detecting a locked state of the wheels. The suspension control node 1d controls the suspension according to the driving state of the vehicle. Output torque control node 1
e detects the slip state of the drive wheels of the vehicle and controls the output torque of the engine.

The engine control node 1a includes a CPU (central processing node) 11a, a transmission / reception unit 21a, a transfer destination setting unit 2
3a, memory 25a, detector 28a, ID counter 30
a, a group setting unit 32a.

The engine node 1a is connected to a sensor 31a provided in each part of the vehicle for detecting a running state and an actuator 41a. In FIG. 1, the sensor 3
1a, only one sensor 1a is actually shown.
It is assumed that a is provided in plurality. CPU 11a
Drives the actuator 41a based on the detection signal from the sensor 31a.

The mission control node 1b, the brake control node 1c, the suspension control node 1d, and the output torque control node 1e have the same configuration as that of the engine control node 1a.

The delegation destination setting unit 23a sets the delegation destination node of the transmission right by the address of the delegation destination node, and sets the next delegation destination node by incrementing the address of the delegation destination node by one.

Each node may have a table storing the addresses of the preceding node, its own node, the next node, etc., and the circulating order may be determined with reference to this table.

The transmission / reception unit 21a is provided with the transfer destination setting unit 23
The transmission right delegation message is transmitted to the transmission right delegation destination node set by a. When the transmitting / receiving unit 21a receives the transmission right transfer message from the preceding node, the transfer destination setting unit 23a sets the next transfer destination node.

The memory 25a stores a plurality of data. The group data setting unit 32a generates a data frame, extracts a plurality of mutually related data as group data from a plurality of data stored in the memory 25a, and sequentially associates each related data in the group data with the same data. Set in the data frame of.

Each related data is provided with an identification number for identifying the data.

The ID counter 30a increments by one each time the group data setting section 32a sets each related data in the same frame, clears the count value when the count value reaches a predetermined value, and clears the initial value. Set to.

The transmission / reception section 21a sequentially sends out the related data in the same frame set by the group data setting section 32a.

FIG. 2 shows the format of the data frame according to the first embodiment. In FIG. 2, the data frame includes an SOM indicating the start of a message, a transfer destination address indicating an address of a transfer right transfer destination node, a transmission source address, data, an error detection character string CRC, reception acknowledgment information, and an end of the message. EOM shown.

The transfer destination address may be set to a value from 0 to 5 corresponding to each control node.

The data includes a data byte length, a data identifier, and information to be transmitted. The reception acknowledgment information includes reception acknowledgment information from a node that has successfully received data and reception acknowledgment information from a node that has normally received a transmission right. The transfer destination address is obtained from the transfer destination setting unit 23a.

FIG. 3 shows the group data set in the same frame. Group data GP shown in FIG.
D is included in the data in the frame shown in FIG. 2 and includes first data ID-1, second data ID-2, and third data ID-3.

Here, for example, the group data GPD
Is state information indicating the state of a node on the bus 3. The first data ID-1 is information of a node connected (optionally mounted) on the bus 3, and here, as shown in FIG. 1, the node numbers 1a, 1b, 1 of each node.
c, 1d, 1e correspond.

The second data ID-2 is information on the nodes actually existing on the bus 3 (option mounted and non-mounted), and here, as shown in FIG. Numbers 1a, 1b, 1c, 1d, 1e, 1f
Is applicable.

The third data ID-3 is remote information between the nodes, for example, information indicating the transmission order, and the transmission order information is the nodes 1a, 1b, 1c, 1
d, 1e.

Next, Embodiment 1 configured as described above
Will be described with reference to the flowchart shown in FIG.
Here, for example, it is assumed that the transmission right circulates in the order of the engine control node 1a, the mission control node 1b, the brake control node 1c, the suspension control node 1d, and the output torque control node 1e.

Here, it is assumed that the initial value of the count value of the ID counter 30a is 1, for example. Data ID-1
Is 1, for example, the ID number of data ID-2 is 2, and the identification number of data ID-3 is 3.

First, the output torque control node 1e is
In the data frame shown in (1), the transfer destination address is "1a (address of the engine control node)" and the source address is "1e
(The address of the output torque control node) ", and transfers it to the engine control node 1a.

Then, the transmission / reception unit 21a of the engine control node 1a sends the transmission transfer destination message (here, the transfer destination address “1”)
a ”) is determined (step 11).

The engine control node 1a receives the delegation destination address "1a" and the source address "1e" and obtains the transmission right. Then, the delegation destination setting unit 23a in the engine control node 1a sets the delegation destination address to the next delegation destination address.
1b (address of mission control node) "(step S13). Next, it is determined whether or not the processing has been completed (step S15).

If the processing has not been completed, the group data setting section 32a of the engine control node 1a sends the ID
The count value of the counter 30a is the identification number of ID-1 "
1 "is determined (step S1).
7).

When the count value of the ID counter 30a is ID-
If it matches the identification number “1” of 1, the group data setting unit 32a generates a data frame. First,
The group data setting unit 32a reads out the data to be transmitted from the memory 25a and also reads out the transfer destination address from the transfer destination setting unit 23a.

Then, the group data setting section 32a
As shown in FIG. 2, the transfer destination address (1b), the source address (1a), and the first data ID-1 are set in a data frame (common frame).

The transmission / reception unit 21a receives the first data ID of the data frame set by the group data setting unit 32a.
-1 is transmitted to the mission control node 1b (step S19). Then, the count value of the ID counter 30a is incremented by 1 (step S21).

If the count value of the ID counter 30a does not match the identification number "1" of ID-1, the process directly proceeds to step S23.

Next, the group data setting section 32a
The count value of the D counter 30a is the identification number of ID-2 "
2 ”(step S2).
3).

When the count value of the ID counter 30a is ID-
If the identification number matches the identification number “2” of No. 2, the group data setting unit 32a sets the second data ID-2 in the same data frame.

The transmission / reception unit 21a transmits the second data ID of the data frame set by the group data setting unit 32a.
-2 is transmitted to the mission control node 1b (step S25). Then, the count value of the ID counter 30a is incremented by 1 (step S27).

If the count value of the ID counter 30a does not match the identification number "2" of ID-2, the process directly proceeds to step S29.

Further, the group data setting section 32a
The count value of the D counter 30a is the identification number of ID-3 "
3 ”(step S2).
9).

When the count value of ID counter 30a is ID-
If the ID number matches the identification number “3” of No. 3, the group data setting unit 32a sets the third data ID-3 in the same data frame.

The transmission / reception unit 21a transmits the third data ID of the data frame set by the group data setting unit 32a.
-3 is transmitted to the mission control node 1b (step S31). Then, the count value of the ID counter 30a is set to the initial value "1" (step S33), and the process returns to step S11.

If the count value of the ID counter 30a does not match the identification number "3" of ID-3, the process directly proceeds to step S11.

That is, the mission control node 1b obtains the transmission right, and data transmission from the mission control node 1b to the brake control node 1c is performed.

As described above, in the vehicle data transmission system adopting the token passing method, the group data setting unit 30a converts some mutually related grouped node state information on the bus 3 into the same data frame. The occupancy of the bus 3 is reduced because the transmission / reception unit 21a alternately sets some node state information in a predetermined order. Therefore, the occupancy of the bus 3 can be made more efficient.

The number of mutually related data is not limited to three, but may be any other number. Further, the control node is not limited to the example described in the embodiment, and other nodes may be added.

Further, in the embodiment, the node status information is described as the data related to each other, but the present invention is not limited to such information, and other data may be used.

[0070]

According to the present invention, the delegation destination setting means sets a transmission right delegation destination node, and the group data setting means comprises several related data among the plurality of data. When each related data of the group data is set in order in the same frame, the transmission / reception means sends a transmission right transfer message to the transmission right transfer destination node set by the transfer destination setting means, and transmits the group data. Some related data in the same frame set by the setting means are sequentially transmitted to the transfer destination node.

That is, some related data set in the same data frame are alternately transmitted onto the bus, so that the occupancy of the bus is reduced and the occupancy of the bus can be made more efficient.

The group data setting means can set the related data in the same frame when the identification number added to each related data is a predetermined identification value.

The group data setting means sets the related data in the same frame when the count value of the counter is a predetermined identification value, and the group data setting means sets the related data in the same frame in the same frame. Counting is performed each time data is set, and when the count value reaches a predetermined count value, the count value is set to an initial value.

Accordingly, each related data can be sent alternately, and the sending process of these related data can be repeated a plurality of times.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a vehicle data transmission system of the present invention.

FIG. 2 is a diagram showing a format of a data frame.

FIG. 3 is a diagram showing group data set in the same data frame.

FIG. 4 is a flowchart showing the operation of the embodiment of the vehicle data transmission system of the present invention.

FIG. 5 is a flowchart illustrating a network abnormality determination of a conventional vehicle data transmission system.

FIG. 6 is a flowchart showing a conventional data transmission / reception between vehicles.

[Explanation of symbols]

 1a Engine control node 1b Mission control node 1c Brake control node 1d Suspension control node 1e Output torque control node 3 Bus 1f Other control nodes 11a CPU 21a Transmission / reception unit 23a Delegation destination setting unit 25a Memory 30a ID counter 31a Sensor 32a Group data setting unit 41a Actuator

Claims (3)

[Claims] 1. A vehicle data transmission system in which a plurality of nodes are connected to a bus, a transmission right is circulated between the nodes in a predetermined order, and a node which has acquired the transmission right sends a plurality of data to the bus. In the above, each of the nodes may include: a delegation destination setting unit configured to set a delegation destination node of the transmission right; and each related data of group data including some related data among the plurality of pieces of data in the same frame. Group data setting means for sequentially setting the transmission right delegation node, and transmitting a transmission right delegation message to the transmission right delegation destination node set by the delegation destination setting means,
A transmission / reception unit for sequentially transmitting some related data in the same frame set by the group data setting unit to the delegation destination node. 2. A unique identification number for identifying the related data is added to each related data of the group data, and the group data setting means sets the identification number added to each related data to a predetermined number. 2. The related data is set in the same frame when it is an identification value.
A vehicle data transmission system according to claim 1. 3. The group data setting means sets related data in the same frame when the count value of the counter is the predetermined identification value, and the group data setting means sets the group data in the same frame. 3. The vehicle data transmission system according to claim 2, wherein the counting is performed each time each related data is set, and the count value is set to an initial value when the count value reaches a predetermined count value.