CN210380895U

CN210380895U - Dual-channel CAN bus redundancy communication system

Info

Publication number: CN210380895U
Application number: CN201921946617.7U
Authority: CN
Inventors: 李家利; 吴了泥; 陈火原
Original assignee: Xiamen Han's Eagle Aviation Technology Co ltd
Current assignee: Xiamen Han's Eagle Aviation Technology Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-04-21
Anticipated expiration: 2029-11-12

Abstract

The utility model discloses a double-circuit CAN bus redundancy communication system relates to CAN bus communication technical field. The master control unit comprises a CAN1 bus controller and a CAN2 bus controller, and the CAN1 bus controller is a master controller; the CAN2 bus controller is a secondary controller; the CAN1 bus controller and the CAN2 bus controller are connected end to end through two cables, and a plurality of devices are connected in parallel between the two cables; the CAN1 bus controller and the CAN2 bus controller form a loop redundancy architecture. When the cable is complete, the cable is equivalent to a common linear topological structure, wherein the secondary controller is used as a common device N +1 access bus; once the bus cable is disconnected, the secondary controller and the main controller communicate with the equipment together, and the system still works normally. By adopting the design, the system CAN still work normally when the CAN bus has a breaking point; when the main controller is abnormal, the system can still work normally; and the system reliability is improved.

Description

Dual-channel CAN bus redundancy communication system

Technical Field

The utility model relates to a CAN bus communication technology field, concretely relates to double-circuit CAN bus redundancy communication system.

Background

CAN is an abbreviation of Controller Area Network (hereinafter CAN) and is a serial communication protocol standardized by ISO international. In the automotive industry, various electronic control systems have been developed for the purpose of safety, comfort, convenience, low pollution, and low cost. Since the types of data used for communication between these systems and the requirements for reliability are different, the number of harnesses is increased in many cases because the harnesses are formed of a plurality of buses. In order to meet the demand for "reducing the number of wire harnesses" and "performing high-speed communication of a large amount of data through a plurality of LANs", german electric company bosch developed a CAN communication protocol for automobiles in 1986. Since then, CAN is standardized by ISO11898 and ISO11519, which are already standard protocols for automotive networks in europe. The high performance and reliability of CAN has been recognized and widely used in industrial automation, ships, medical equipment, industrial equipment, and the like. The field bus is one of the hot spots of the technical development in the current automation field, and is known as a computer local area network in the automation field. The occurrence of the method provides powerful technical support for realizing real-time and reliable data communication among all nodes of a distributed control system.

As shown in fig. 1, each node of the conventional linear topology forms a single-chain communication, and all nodes on the bus can communicate with each other only through a single link. According to the traditional CAN bus using method, one CAN bus comprises a plurality of nodes, once the bus is broken or a controller serving as a main control unit fails, subsequent nodes cannot communicate, and the system is out of control, so that the risk is high. As shown in fig. 2, if the bus is broken, the devices M +1 to N cannot communicate with the main control unit, and the system cannot communicate and operate normally. As shown in fig. 3, if the CAN controller fails, all devices cannot communicate with the main control unit, and the entire system cannot work normally.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

An object of the utility model is to provide a double-circuit CAN bus redundancy communication system to solve traditional CAN bus application method who proposes in the above-mentioned background art and contain a plurality of nodes on being the CAN bus of the same kind, in case the bus breaks down or breaks down as the controller of main control unit, follow-up node all CAN't communicate, and the system is out of control, therefore the higher problem of risk. The normal communication and work of the system CAN be ensured when any part of a bus cable is broken or the main controller fails through the dual CAN redundancy, and the reliability of the whole system is enhanced.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a two-way CAN bus redundancy communication system, it contains the master control unit, the master control unit contains CAN1 bus controller and CAN2 bus controller, and CAN1 bus controller and CAN2 bus controller pass through two cable end to end connection, and the parallel access several equipment between two cables.

As a further improvement of the utility model, the CAN1 bus controller is a main controller.

As a further improvement of the utility model, the CAN2 bus controller is a secondary controller.

As a further improvement of the utility model, CAN1 bus controller and CAN2 bus controller form the loop redundancy structure.

(III) advantageous effects

Compared with the prior art, after the technical scheme is adopted, the utility model discloses beneficial effect does:

the main control unit adopts two CAN bus controllers which are connected end to end, one is used as a main controller, the other is used as a secondary controller, and the two CAN bus controllers are redundant with each other; when the cable is complete, the cable is equivalent to a common linear topological structure, wherein the secondary controller is used as a common device N +1 access bus; once the bus cable is disconnected, the secondary controller and the main controller communicate with the equipment together, and the system still works normally. By adopting the design, the system CAN still work normally when the CAN bus has a breaking point; the system can still work normally when the main controller is abnormal; and the system reliability is improved.

Drawings

FIG. 1 is a schematic diagram of a conventional CAN bus communication method;

FIG. 2 is a schematic diagram of a conventional CAN bus communication mode- -bus rupture;

FIG. 3 is a schematic diagram of a conventional CAN bus communication mode- -controller failure;

fig. 4 is a schematic structural diagram of a communication method according to an embodiment of the present invention;

fig. 5 is a schematic diagram of bus break as a communication method according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a communication mode of the present invention, namely a CAN1 bus controller fault;

description of reference numerals: 1. CAN1 bus controller; 2. CAN2 bus controller.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 4, the present invention provides an embodiment: a two-way CAN bus redundancy communication system comprises a master control unit, wherein the master control unit comprises a CAN1 bus controller 1 and a CAN2 bus controller 2, and the CAN1 bus controller 1 is a master controller; the CAN2 bus controller 2 is a secondary controller; the CAN1 bus controller 1 and the CAN2 bus controller 2 are connected end to end through two cables, and a plurality of devices are connected in parallel between the two cables; the CAN1 bus controller 1 and the CAN2 bus controller 2 form a loop redundancy structure.

Referring to fig. 4, when the cable is intact and the master controller (CAN1 bus controller 1) works normally, the master unit CAN communicate with all devices normally through the CAN1 bus controller 1, and at this time, the CAN2 bus controller 2 of the master unit is equivalent to a normal device N +1, and CAN receive data of the CAN1 bus controller 1 normally.

Referring to fig. 5, when a break occurs somewhere on the bus:

(1) if the CAN2 bus controller 2 cannot normally receive the data of the CAN1 bus controller 1, the master control unit immediately starts the CAN2 bus controller 2 controller;

(2) at the moment, the CAN1 bus controller 1 communicates with the equipment 1 to the equipment M, and the CAN2 bus controller 2 communicates with the equipment M +1 to the equipment N;

(3) at this time, the main control unit can normally communicate with all the devices in the system, and the system can normally work.

Referring to fig. 6, when the master controller (CAN1 bus controller 1) fails:

(1) if the CAN2 bus controller 2 cannot normally receive the data of the CAN1 bus controller 1, the master control unit immediately starts the CAN2 bus controller 2;

(2) at the moment, the CAN2 bus controller 2 communicates with all the devices 1-N;

In summary, the communication mode that two CAN bus controllers are redundant to each other is adopted, so that the system CAN still work normally when the CAN bus has a breaking point; if the main controller is abnormal, the system can still work normally; therefore, the reliability of the system is greatly improved after the method is adopted, and the problems that once the bus is broken or the controller serving as the main control unit fails, subsequent nodes cannot communicate and the system is out of control, so that the risk is high due to the fact that the traditional CAN bus using method comprises a plurality of nodes on one path of CAN bus are solved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A two-way CAN bus redundancy communication system comprises a master control unit and is characterized in that the master control unit comprises a CAN1 bus controller and a CAN2 bus controller, the CAN1 bus controller and the CAN2 bus controller are connected end to end through two cables, and a plurality of devices are connected in parallel between the two cables.

2. The two-way CAN bus redundancy communication system of claim 1, wherein the CAN1 bus controller is a master controller.

3. The two-way CAN bus redundancy communication system of claim 1, wherein the CAN2 bus controller is a secondary controller.

4. The two-way CAN bus redundancy communication system of claim 1, wherein the CAN1 bus controller and the CAN2 bus controller form a loop redundancy architecture.