CAN message arbitration influence factor detection system and method thereof

Abstract

The invention relates to a CAN message arbitration influence factor detection system which is composed of a first node, a second node and a CAN bus. The system is characterized in that the state display signal output end of a first processor embedded in the first node is connected with the input end of a first LCD display unit, the control input end of the first processor is connected with the data output end of a first keyboard, the reset signal output end of a first reset button is connected with the reset signal input end of the first processor, a first oscillator is connected with the oscillation input end of the first processor through a first oscillator socket, a bus communication end of the first processor is connected with the data transmitting and receiving ends of a first transceiver A, a first transceiver B, a first transceiver C, a first transceiver D and a first transceiver E, the characteristic of the second node is the same as that of the first node, and the first node and the second node are hooked on the CAN bus. The system can detect influence on message arbitration from CAN controller position timing parameters, oscillator tolerance, transceiver delay and harness physical delay, the parameters can be set more scientifically and reasonably, and therefore effectiveness of CAN message arbitration can be ensured.

Description

technical field [0001] The invention relates to a CAN message arbitration influencing factor detection system and a method thereof, which are applied to detect various factors affecting CAN message arbitration in CAN network communication. Background technique [0002] The non-destructive arbitration carrier sense multiple access / collision avoidance (CSMA / CA) feature of the CAN bus has always been one of the important advantages of the CAN bus, so it has been widely used in automotive network communications. In order to ensure that the CAN message can successfully complete the message arbitration according to the agreed priority, the user can avoid the occurrence of arbitration failure by setting the bit rate, the position of the sampling point, the physical delay of the wiring harness, and selecting a high-quality transceiver, but it will affect the CAN message. There are many factors in civil arbitration, and each factor restricts each other, so it needs to be considered c...

AI Technical Summary

Problems solved by technology

At present, the setting of relevant parameters affecting CAN message arbitration in China is only based on theoretical analysis, and there is no detection system and effective method to detect the influence of these factors on message arbitration, so that in CAN network design there is a certain risk

[0003] Whether the CAN message can be successfully arbitrated mainly depends on the setting of CAN controller bit timing parameters, the selection of the tolerance of the oscillator, the cycle delay of the transceiver and the size of the physical delay on the wiring harness. If the above parameters are not set properly, the Low-priority messages are sent before high-priority messages, causing CAN message arbitration failure

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