轮速传感器AK协议解码系统设计与实现

Design and Implementation of AK Protocol Decoding System for Wheel Speed Sensor

带AK协议的轮速传感器为汽车主动安全控制系统提供了轮速信息的同时,还提供了转动方向以及诊断等其他信息,为控制系统可靠性的提升发挥了重要的作用。文章以机电制动控制器(Electromechanical Brake System,EMB)为例,采用分立电路与EMB控制器自带的微处理器设计解码系统,进行轮速传感器AK协议解码。通过对AK协议的关键特征进行分析,设计了硬件信号处理电路,分别提取出速度信号与数据信号。基于微控制单元(Microcontroller Unit,MCU)现有的AUTOSAR软件架构,以复杂驱动的形式设计解码软件,进行速度与数据解码。搭建测试平台,对解码系统进行测试。测试结果证明,解码系统对速度和数据的解码结果准确,具有工程实用性。

The wheel speed sensor with AK protocol provides not only wheel speed information,but also rotation direction,diagnosis and other information for the vehicle active safety control system,which plays an important role in improving the reliability of the control system.Taking Electromechanical Brake System(EMB)as an example,the AK protocol of wheel speed sensor is decoded by discrete circuit and the microprocessor of EMB controller.By analyzing the key features of AK protocol,the hardware signal processing circuit is designed,and the speed signal and data signal are extracted respectively.Based on the existing AUTOSAR software architecture of MCU,the decoding software is designed in the form of complex driver for speed and data decoding.Set up a test platform to test the decoding system,and the test results prove that the decoding system is effective,and the scheme has engineering practicability.