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为考核电动汽车在实际道路工况运行时车辆性能及各关键部件匹配情况,基于GPRS/GPS与CAN总线开发了无线监测平台。车载监测终端通过CAN总线接口及预留接口可得到车辆、电动机、电池组的实时工作参数及故障信息,并通过GPRS无线网络传回监控中心,监控中心按通讯协议解析后实现车辆运行状态的实时监测。依据无线监控平台技术需求,开发了以双核MC9S12XET256微处理器为核心的车载监测终端,制定了车载监测终端与监控中心以数据包为基本单位的数据传输协议。实验室试验及实车道路测试结果表明通讯速率为5 kb/s时,数据传输速率及准确率可满足对纯电动汽车实时运行参数监测的需求。
In order to assess the vehicle performance and the matching of key components of electric vehicles in actual road conditions, a wireless monitoring platform was developed based on GPRS / GPS and CAN bus. Vehicle monitoring terminal through the CAN bus interface and interface can be reserved for vehicles, motors, battery pack real-time operating parameters and fault information, and back to the monitoring center through the GPRS wireless network, the monitoring center according to the communication protocol to analyze the real-time running status of the vehicle monitor. According to the technical requirements of the wireless monitoring platform, a dual-core MC9S12XET256 microprocessor as the core of the vehicle monitoring terminal has been developed and a data transmission protocol based on the data packet has been developed for the on-board monitoring terminal and the monitoring center. Laboratory tests and actual vehicle road test results show that the data transmission rate and accuracy can meet the real-time operating parameters of pure electric vehicle monitoring when the communication speed is 5 kb / s.