Wiring method for improving reliability of controller area network (CAN) bus and CAN bus system

Abstract

The invention provides a wiring method for improving reliability of a controller area network (CAN) bus and a CAN bus system. The method comprises the steps of connecting data buses with more than three CAN transceivers into a loop in electrical characteristics; and arranging at least one terminal resistor on the data buses. As the data buses are connected into the loop in electrical characteristics, the reliability of the data bus is improved greatly when the bus is offline, and normal data communication can be guaranteed to the great extent. The invention also provides the CAN bus system realized by the wiring method, and an automotive electrical appliance network system adopting the CAN bus system.

Description

technical field [0001] The invention relates to the technical field of CAN bus communication, in particular to a wiring method and a CAN bus system for improving the reliability of the CAN bus. Background technique [0002] CAN (Controller Area Network), that is, the controller area network, was originally designed by the German BOSCH company for vehicle monitoring and control systems. Modern automobiles are increasingly controlled by electronic devices, such as engine timing, fuel injection control, acceleration and braking control (ASC) and complex anti-lock braking system (ABS). Because these controls need to detect and exchange a large amount of data, the point-to-point signal wiring method is not only cumbersome and expensive, but also difficult to solve the problem. The above problems can be solved well by using the CAN bus. Due to the high performance, high reliability and unique design of the CAN bus, people pay more and more attention to it and are widely used. ...

AI Technical Summary

Problems solved by technology

like image 3 As shown, if all or a certain data line between the first node group (composed of nodes where CAN transceivers 1a and 1b are located) and the second node group (composed of nodes where CAN transceivers 1c and 1d are located) is physically If a disconnection occurs in the characteristics, a normal current loop cannot be formed between the first node group and the second node group, resulting in the failure of normal communication between the first node group and the second node group, resulting in communication interruption

When a node adopts the connection method of serial connection to the bus, and the node falls off, is damaged, etc., causing a short circuit in the electrical performance of the bus, then other nodes connected to the bus will not be able to communicate effectively, and serious errors may occur in the entire system. judge and pose a security threat

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