Controller area network (CAN) bus-based anti-electromagnetic interference method and device

Abstract

The invention discloses a controller area network (CAN) bus-based anti-electromagnetic interference method and a CAN bus-based anti-electromagnetic interference device, which belong to the technical field of battery electric vehicle buses. Each control unit of a battery electric vehicle shares all information and resources by a CAN bus so as to fulfill the aims of simplifying wiring, reducing the number of sensors, avoiding the repetition of control functions, improving the reliability and maintainability of a system, reducing the cost and better matching and coordinating each control system. The key for well control over the battery electric vehicle is the reliability of CAN bus communication. The battery electric vehicle is a high-mechatronics product, and the whole system may generate a great number of high frequency signals when working to influence the normal communication of the CAN bus. The method and the device aim to improve the anti-interference capability of the CAN bus; and an anti-interference circuit is designed by utilizing the principle of CAN bus transmission, and a common mode choke is arranged to filter common mode electromagnetic interference on a signal wire and suppress the external transmission of own electromagnetic interference so as to greatly improve the reliability of the CAN bus communication.

Description

technical field [0001] The invention relates to a CAN bus-based anti-electromagnetic interference method and device, belonging to the field of pure electric vehicle bus technology. Background technique [0002] Pure electric vehicles are highly mechatronic products. Compared with traditional internal combustion engine vehicles, they have added many electrical components, such as motors, power batteries, power converters, and various controllers. When they work, they will generate a lot of high-frequency Electromagnetic waves interfere with each other, which means that pure electric vehicles face a more severe test in electromagnetic anti-interference. [0003] Pure electric vehicle control requires good communication coordination and operational reliability, and a good communication system is the key to the reliable operation of electric vehicles. The CAN bus structure is a serial communication network that effectively supports distributed control or real-time control. The...

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Problems solved by technology

However, the photoelectric isolator has the effect of suppressing the differential mode disturbance, but has no obvious effect on the common mode disturbance, and cannot completely solve the electromagnetic interference problem on the CAN bus.

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