Method and device for Zigbee technology-based FlexRay bus test and optimization

Abstract

The invention relates to a method and a device for Zigbee technology-based FlexRay bus test and optimization. The device comprises a PC, a Zigbee module and a FlexRay bus test node, wherein the FlexRay bus test node comprises a Zigbee module, a programmable clock chip, a digital potentiometer and an MCU microprocessor. According to the method and the device disclosed by the invention, the state of a FlexRay bus is detected and controlled in real time by applying a Zigbee technology, the programmable clock chip and the digital potentiometer are utilized for adjusting a transmission frequency and a matching impedance, reducing the packet error rate of the bus, improving the transmission quality and the reliability of the bus, and increasing the transmission efficiency of the bus; the method and the device are capable of realizing automatic assessment, test and parameter optimization for the performances of the FlexRay bus, and capable of giving the optimal impedance matching reference value of each node, thus improving the reliability of the data transmission of the FlexRay bus.

Description

technical field [0001] The invention belongs to the field of electronic technology testing, and relates to a method and device for testing and optimizing a FlexRay bus based on ZigBee technology. Background technique [0002] FlexRay is a high-speed serial communication, time-triggered network protocol compatible with event-triggered. The network formed by using the FlexRay protocol is mainly used in the active air suspension system and some all-electric braking systems of advanced vehicles. In these systems, the FlexRay network collects the physical information of each suspension or wheel of the car, and then summarizes it to the suspension control electronic control unit (ECU) or the braking system ECU. The system sends control commands. Each ECU node in the FlexRay network controls the operation of various functional components of the car, which is of great significance to improving the operability, safety and intelligence of the car. However, at present, the entire au...

AI Technical Summary

Problems solved by technology

However, at present, the entire automotive industry lacks engineering experience in FlexRay network applications, and also lacks methods and means for comprehensive evaluation of FlexRay network performance, resulting in the high packet error rate of the FlexRay bus in complex networks.

[0003] At present, the test method for the FlexRay network bus is usually based on short-distance wired communication equipment such as USB, and it is not feasible for the test of long-distance complex networks in actual projects.

Moreover, the existing methods can only perform sending and receiving tests on a single FlexRay device node, and cannot fully evaluate the performance indicators of the entire FlexRay network

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