WO2011160335A1

WO2011160335A1 - Method and device for configuring network node addresses in controller area network automatically

Info

Publication number: WO2011160335A1
Application number: PCT/CN2010/076334
Authority: WO
Inventors: 滕凌巧; 孟燕妮; 刘明明; 周保航; 韦树旺
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-21
Filing date: 2010-08-25
Publication date: 2011-12-29
Also published as: CN101877727B; CN101877727A

Abstract

The present invention discloses a method and device for configuring network node addresses in a Controller Area Network (CAN) automatically. The method provides a process for transmitting preset address messages and preset address response messages in the CAN communication network, a method for configuring preset addresses and address configuration factors, and corresponding measures taken by each node device according to different types of preset address response messages, and others. The present invention solves the problem of configuring node addresses in the CAN network automatically. The invention adopts a pure-software configuration strategy without additional hardware cost; meanwhile, a self-adapting address detection method enables a simpler address configuration; therefore, the flexibility and the extensibility of the system are greatly improved and the application range is widened.

Description

Automatic setting method and device for CAN network node address

The present invention relates to a technique for setting a network node address of a Controller Area Network (CAN), and more particularly to a method and apparatus for automatically setting a network node address. Background technique

With the rapid development of the monitoring field, the requirements for monitoring technology are getting higher and higher, and more and more devices need to be monitored. The number of node devices in the CAN network has doubled. How to effectively distinguish each node device into effective management The key, the system structure diagram of CAN network is shown in Figure 1. The information exchange and management between each node device in real time, especially in the master-slave communication mode, must determine the address information of each slave node, each node The device must guarantee the uniqueness of the communication address. The method of setting the node address of the CAN network uses methods such as fixed address and hardware dialing, which is inferior in scalability and flexibility. The method of fixed address is to set the address of each node device according to certain principles. The management of this method is convenient, but the dependence on people is strong and the flexibility is poor. If the number of node devices is large, the workload of address setting is It will increase greatly, and the possibility of error will be greatly improved; and the hardware dialing method will make the address setting work much, and the number of manageable node devices is small, and there are fewer occasions to adapt. Summary of the invention

The purpose of the embodiments of the present invention is to provide an automatic setting method for a CAN network node address, which can better solve the problem of address setting in a CAN network.

Another object of the embodiments of the present invention is to provide an automatic setting device for a CAN network node address, which can better solve the problem of address setting in a CAN network. According to an aspect of an embodiment of the present invention, a method for automatically setting a CAN network node address is provided, including the following steps:

A. Each node device in the CAN network sets the preset address of the local device separately;

B. The node devices respectively send preset address information of the local device to other node devices in the CAN network;

C. The other node device that receives the preset address information sends preset address response information about the preset address information.

D. The node device that sends the preset address information receives the preset address response information sent by the other node device, and determines and saves the local address according to the preset address response information.

According to another aspect of the present invention, an apparatus for automatically setting a CAN network node address is provided, including:

a preset address generating unit, configured to set a preset address of the local device by each node device in the CAN network;

a preset address information sending unit, configured to send, by each node device, preset address information of the local device to other node devices in the CAN network;

a preset address information response unit, wherein the other node device for receiving the preset address information responds to the preset address information about the preset address information and sends the preset address information;

The preset address information response receiving unit, the node device for sending the preset address information receives the preset address response information sent by the other node device;

The address setting unit, the node device for transmitting the preset address information determines and saves the local address according to the preset address response information.

Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows: The embodiment of the present invention can automatically complete the setting of the address of each device node in the CAN network, and the automatic setting policy can be applied to the master-slave communication mode or the competitive communication mode. A variety of communication methods, but also avoid communication management errors caused by mistakes in address setting, and the intelligence of device management is greatly improved. DRAWINGS

1 is a system structural diagram of a CAN network provided by the prior art;

2 is a logic flow chart of a CAN network node address setting provided by this embodiment. FIG. 3 is a structural diagram of a CAN network node address setting apparatus provided in this embodiment. FIG. 4 is an automatic diagram of a CAN network node address provided by this embodiment. Set up the flow chart. detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

FIG. 2 shows the logic flow of the CAN network node address setting provided by this embodiment. As shown in FIG. 2, the process mainly includes the following steps:

Step S201: Each node device in the CAN network sets a preset address of the local device. The node device needs to detect whether it has a preset address. If the detection result is that the preset address is already stored and the address is within the valid range, the address is set as the preset address of the local machine; If the preset address is not stored, the node device sets the preset address of the local device within the valid range. The preset address can be discontinuous. Different methods can be set according to different system requirements. As long as it is within the valid range, the lower limit of the effective range is 1 and the upper limit should be greater than or equal to the node in the CAN network. The total number of devices. The node device may be a device that is applicable to a CAN network, such as a power monitoring device, a monitor in a cell, or the like.

In addition, before this step, each node device needs to set the address setting factor of the local device separately, and the generation method of the factor may be formulated according to different systems, and the method includes obtaining the device serial number or the startup time.

Step S202: Each node device sends the preset address information of the local device to other node devices in the CAN network.

Step S203: The other node device that receives the preset address information sends preset address response information about the preset address information. The preset address response information includes one of the following:

The address setting response information is used to indicate that the address set by the other node device is the same as the preset address in the preset address information;

The preset address is the same response information, and is used to indicate that the preset address of the other node device is the same as the preset address in the preset address information;

The preset address has different response information, and is used to indicate that the preset address of the other node device is different from the preset address in the preset address information.

Step S204: The node device that sends the preset address information receives the preset address response information sent by the other node device, and determines and saves the local address according to the preset address response information.

The node device that sends the preset address information determines the local address according to the received preset address response information, specifically:

If the preset address response information is the address setting response information, the node device discards the original preset address, regenerates the preset address of the local device, and sends the newly generated preset address information to other node devices again, and waits for the predetermined time. TO;

If the preset address response information is the same response information of the preset address, the node device determines the local address according to the size of the address setting factor; if the address setting factor of the node device is greater than the node device that sends the same response information with the preset address The address setting factor, and the other type of preset address response information is not received within the predetermined time TO, the node device sets the preset address of the local device as the local address; if the address setting factor of the node device is less than or Equal to the address setting factor of the node device that sends the same response information to the preset address, the node device discards the original preset address, regenerates the preset address of the local device, and sends the newly generated preset address information to other node devices again;

If the preset address response information is different response information of the preset address, and other types of preset address response information are not received within the predetermined time TO, the node device sets the preset address of the local machine as the local address. The predetermined time TO is determined according to the rate of the network, the number of node devices in the network, and the internal processing mechanism of each node device.

If the preset address of the regenerated local machine is the same as the preset address generated last time, the preset address of the local machine is regenerated again until the newly generated preset address is different from the previously generated preset address.

After the local address is determined, if the node device that determines the address receives the preset address in the preset address information sent by the other node device and the local address is the same, the address setting response information is sent to the node device. Also, when the node device starts up next time, the address set this time is used as the default address of the machine.

FIG. 3 shows the structure of the CAN network node address setting apparatus provided in this embodiment, as shown in FIG. 3. The device comprises: a preset address generating unit, a preset address information transmitting unit, a preset address information responding unit, a preset address information response receiving unit, and an address setting unit.

The preset address generating unit is configured to set a preset address of the local device by each node device in the CAN network.

The preset address information sending unit is configured to send, by each node device, preset address information of the local device to other node devices in the CAN network.

The preset address information response unit, the other node device for receiving the preset address information responds to and sends the preset address information about the preset address information.

The preset address information response receiving unit, the node device for sending the preset address information receives the preset address response information sent by the other node device.

FIG. 4 shows the automatic setting procedure of the CAN network node address provided by this embodiment, as shown in FIG. 4.

Embodiment 1: In the communication DC power system, the monitoring unit and each rectifier form a CAN bus network. The monitoring unit and each rectifier are a typical master-slave communication mode. The monitoring unit is the master node device, and each rectifier is a slave node device. CAN The network communication rate is 500Kbps, and the adopted message format is extended 29-bit data bit format. The system has one monitoring unit, 10 rectifiers, and the set address saved by the rectifier is stored in the electrically erasable programmable read-only memory ( In EERPOM, Electrically Erasable Programmable Read-Only Memory ), the initial value is 0, and the address setting steps are as follows:

Step S401, after the system is powered on, each rectifier separately obtains the number of milliseconds of the startup of the internal monitoring software, and is used as the address setting factor of the local randomN, where N is the serial number of the rectifier, that is, 1~10;

Steps S402~405, reading the address information from the EEPROM. If the address information is 0, a preset address addrN ranging from 1 to 50 is generated; if the address information in the EEPROM is not 0, and is in the range of 1~50 Inside, the address is used as the default address addrN of the local device. If it is not within the range of 1~50, a preset address addrN ranging from 1 to 50 is generated;

Step S406, the monitoring software in the rectifier sends the preset address information of the local device to other node devices in the CAN network;

Steps S407~S416, within the predetermined time T0=50ms, one of the following types of data information may be received, and the T0 value may be appropriately adjusted according to the specific situation:

If the address setting response message sent by another rectifier is received, it indicates that the address set by the other rectifier is the same as the preset address in the preset address information of the local machine. At this time, the rectifier abandons the original preset address and regenerates a new one. The preset address, if the newly generated address is the same as the last generated address, it is regenerated once until the newly generated preset address is different from the previously generated preset address; this processing can alleviate the network. Burden, shorten the time set by the address; if receiving the same response information from the preset address sent by other rectifiers, it means that the preset address of the other rectifier is the same as the preset address in the preset address information of the local machine. Rectifier If the address setting factor is greater than the address setting factor of the rectifier that sends the same response information as the preset address, and the other types of preset address response information are not received within the predetermined time TO, the rectifier sets the preset address of the local machine to the local device. Address; if the address setting factor of the rectifier is less than or equal to the address setting factor of the node device that sends the same response information of the preset address, the rectifier discards the original preset address, regenerates the preset address of the local device, and re-generates to the other node device. Send newly generated preset address information;

If different response information is received from the preset address sent by the other rectifier, it indicates that the preset address of the other rectifier is different from the preset address in the preset address information of the local device. At this time, if the rectifier does not receive within the predetermined time TO For other types of preset address response information, the rectifier sets the preset address of the unit to the local address.

Step S417, after the rectifier determines the local address, saves the address in the EEPROM, and sends an address confirmation message to the monitoring unit. After receiving the address, the monitoring unit records the address and starts normal CAN communication. Thereafter, when the preset address information sent by the other rectifiers is received, if the preset address in the preset address information is the same as the local address, the address setting response information is sent to the rectifier that sends the preset address information.

Embodiment 2:

In the communication DC power system, a rectifier bus constitutes a peer-to-peer communication mode CAN bus network, the CAN communication rate is 500Kbps, the message format is an extended 29-bit data bit, and the rectifier stores the set address in the FLASH. , the initial value is 0, the address setting steps are as follows:

Step S401, after the system is powered on, each rectifier obtains the factory time of the machine, that is, the year, month, day, hour, minute and second, as the address setting factor randomN of the machine, wherein the value of N is 1 to 6;

Steps S402~405, reading the address information from the FLASH, if the address information is 0, generating a preset address addrN ranging from 1 to 30; if the address information in the EEPROM is not 0, and in the range of 1~30 Inside, the address is used as the default address addrN of the machine; if not in 1~30 Within the range, a preset address addrN ranging from 1 to 30 is generated;

Steps S407~S416, within the predetermined time T0=30ms, one of the following types of data information may be received, and the TO value may be appropriately adjusted according to the specific situation:

If the address setting response message sent by another rectifier is received, the rectifier relinquishes the original preset address and regenerates a new preset address. If the newly generated address is the same as the last generated address, it is generated again until Different from the last preset address;

If the same response information is received from the preset address sent by the other rectifiers, if the address setting factor of the rectifier is greater than the address setting factor of the rectifier that sends the same response information of the preset address, and no other type is received within the predetermined time TO The preset address response information, the rectifier sets the preset address of the local machine as the local address; otherwise, the rectifier relinquishes the original preset address, regenerates the preset address of the local device, and sends the new generation to the other node device again. The preset address information; if different response information is received from the preset address sent by the other rectifier, at this time, if the rectifier does not receive other types of preset address response information within the predetermined time TO, the rectifier will be the local The default address is set to the local address;

Step S417, after the rectifier determines the local address, the address is saved in the FLASH, and normal CAN communication is started. Thereafter, when the preset address information sent by the other rectifiers is received, if the preset address in the preset address information is the same as the local address, the address setting response information is sent to the rectifier that sends the preset address information.

In summary, the embodiment has the following technical effects: The automatic setting method of the CAN network node address uses a pure software setting policy, so there is no need to increase the cost on the hardware, and in addition, the embodiment uses an adaptive address. The detection method makes the address setting simple, and the number of node devices in the network can be unrestricted, which greatly improves the flexibility and scalability of the system, and has a wider application range. Although the invention has been described in detail above, the invention is not limited thereto, and various modifications may be made by those skilled in the art in accordance with the principles of the invention. Therefore, modifications made in accordance with the principles of the invention should be construed as falling within the scope of the invention.

Claims

Claim

1. A method for automatically setting a controller local area network (CAN) network node address, comprising the steps of:

2. The automatic setting method of a CAN network node address according to claim 1, wherein the preset address response information comprises one of the following:

3. The automatic setting method of a CAN network node address according to claim 1, wherein each of the node devices sets an address setting factor of the local device before the step A.

4. The automatic setting method of a CAN network node address according to claim 1, wherein the step A comprises the following steps:

Al, each node device detects whether a preset address is already stored by itself;

A2. If the detection result is that a preset address is already stored and the address is within the valid range, the place is The address is set to the default address of the machine;

A3. If the detection result is that the preset address is not stored, the node device automatically sets the preset address of the local machine within the valid range.

The method for automatically setting a node address of a CAN network according to claim 2 or 4, wherein the method for formulating the preset address can be determined by itself under the condition that the value is within the valid range, and the method is effective. The lower limit of the range is 1 and the upper limit should be greater than or equal to the total number of node devices in the CAN network.

The method for automatically setting a node address of a CAN network according to claim 3, wherein the step of the node device that transmits the preset address information determining the local address according to the preset address response information includes one of the following :

If the preset address response information is the address setting response information, the node device discards the original preset address, regenerates the preset address of the local device, and sends the newly generated preset address information to other node devices again, and waits for the reservation. Time TO;

If the preset address response information is the same response information as the preset address, the node device determines the local address according to the size of the address setting factor;

If the preset address response information is different response information of the preset address, and other types of preset address response information are not received within the predetermined time TO, the node device sets the preset address of the local machine as the local address.

7. The automatic setting method of a CAN network node address according to claim 6, wherein the step of the node device determining the local address according to the size of the address setting factor comprises one of the following:

If the address setting factor of the node device is greater than the address setting factor of the node device that sends the same response information as the preset address, and the other types of preset address response information are not received within the predetermined time TO, the node device will The default address of the machine is set to the local address;

If the address setting factor of the node device is less than or equal to the same response address as the sending preset address The address setting factor of the node device of the information, the node device discards the original preset address, regenerates the preset address of the local device, and sends the newly generated preset address information to the other node device again.

8. The method for automatically setting a CAN network node address according to claim 7, wherein the regenerated local preset address is regenerated locally if the preset address is the same as the last generated preset address. The default address until the newly generated preset address is different from the last generated preset address.

The method for automatically setting a CAN network node address according to claim 2, wherein after determining the local address in the step D, if the node device receives the preset sent by the other node device If the preset address in the address information is the same as the local address, the address setting response information is sent to the node device that sends the preset address information.

The method for automatically setting a node address of a CAN network according to claim 1, wherein, after the step D, the node device preferentially uses the address set this time as the local device. Default address.

An automatic setting device for a CAN network node address, comprising: a preset address generating unit, configured to set a preset address of the local device by each node device in the CAN network;