CAN network system and packet transmission control method

Abstract

The invention provides a packet transmission control method based on a CAN network system. The method comprises the steps that a CAN converter receives CAN packets sent by a number of network nodes; the type of the CAN packets is analyzed; if the CAN packets are the first type, the CAN packets are sent to a monitoring host; if the CAN packets are the second type, the CAN packets are written into corresponding transmitting buffer areas; and the CAN converter sequentially sends the CAN packets in a number of transmitting buffer areas to the monitoring host according to a predetermined period. According to the packet transmission control method based on the CAN network system, which is provided by the invention, CAN network congestion can be effectively avoided, and the packet response speed is improved. The invention further provides the CAN network system.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a CAN network system and a message transmission control method based on the CAN network system. Background technique [0002] At present, various functional devices in many vehicles communicate through the CAN network, which requires the CAN network to be stable and reliable, and to be able to transmit various messages in a timely manner. However, due to the large number of messages transmitted on the CAN bus, sometimes the CAN network is blocked. For example: for electric vehicles, it is necessary to monitor the working status of multiple single cells of the power battery (the single cells can be simulated through the battery simulation board), and the messages sent by multiple single cells need to be transmitted to the monitoring host. Each single battery is equivalent to a network node in the CAN network, and it is recommended that there are no more than 32 network no...

AI Technical Summary

Problems solved by technology

Conventional CAN converters are only triggered, and forward the received lower-layer network messages to the upper-layer network. If there are many lower-layer network nodes (battery simulation boards), the amount of messages in the lower-layer network is large, and the processing capacity of the CAN converter is not enough. , many messages from the lower network nodes cannot be forwarded to the upper network, resulting in frame loss. At the same time, the amount of messages in the upper network is relatively large, and the CAN network may cause congestion.

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