Single can controller hot redundant can bus system and its realization method

Abstract

The invention discloses a single control area network (CAN) controller hot-redundant CAN bus system and relates to the field of CAN buses. The system comprises two buses and a plurality of CAN node circuits, wherein each of CAN node circuits is connected to two buses at the same time, each of CAN node circuits comprises a micro processor, a fault processing circuit, a CAN controller, an arbitration receiving and selecting unit, a first separating receiving-transmitting unit and a second separating receiving-transmitting unit, first separating receiving-transmitting units and second separating receiving-transmitting units are used for transmitting data received by buses to arbitration receiving and selecting units, arbitration receiving and selecting units are used for transmitting data to CAN controllers, and CAN controllers are used for transmitting data to micro processors, and fault processing circuits are used for receiving data from arbitration receiving and selecting units and micro processors and respectively transmitting enable control signals to first separating receiving-transmitting units and second separating receiving-transmitting units. The system has the advantages that the operation is simple, the reliability of data receiving and transmitting is high, the hardware cost is low and the difficulty of redundant bus development is simplified greatly.

Description

technical field [0001] The invention relates to the field of CAN (Controller Area Network, controller local area network) bus, specifically a single CAN controller hot redundant CAN bus system and an implementation method thereof. Background technique [0002] As a field bus with international standards, CAN bus has been widely used in the fields of automobile industry, machinery industry, agricultural machinery, textile machinery, robot, CNC machine tools, medical equipment, household appliances and sensors. The CAN bus has the following characteristics: ⑴ CAN bus is a multi-master working mode, any node on the bus can actively send data to other nodes on the bus at any time, regardless of master and slave; ⑵ CAN bus adopts non-destructive bus arbitration technology, message identifier The smaller the priority, the higher the priority. Messages with high priority will be sent first, and those with low priority will voluntarily withdraw from the bus and resend after the bus ...

AI Technical Summary

Problems solved by technology

There are many implementation methods of this kind at present, but because more bus controllers need to be configured, the hardware cost is relatively high; the software is complicated, and two sets of complete CAN bus communication-related variables need to be configured, which is very difficult for a microprocessor with a small storage capacity. big overhead

Especially when two buses receive data at the same time, how to merge the data is quite troublesome

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