新型双EPB冗余系统电子电气架构设计与试验

Electronic and Electrical Architecture Design and Experiment of New Dual EPB Redundant System

以某款商用车所配备的传统拉索式电子驻车(electrical park brake,EPB)为研究对象,在不改变拉索式EPB结构的情况下,设计一款能够适应该商用车坡道驻车工况的新型双EPB冗余系统。该电子电气通信架构通过引入中继控制器实现对两个EPB的控制器局域网络(controller area network,CAN)信息的隔离与交互,消除双EPB在冗余时的信号干扰现象;同时,台架试验研究表明,该双冗余系统能够极大地缩短EPB对驻车制动力需求的响应时间,比传统拉索式EPB的驻车制动力响应时间大约缩短了140 ms,并且当车辆驻车过程中,车辆中心线与坡道中心线不重合时,通过中继控制器处理后能够根据两侧车轮需要进行驻车制动力分配,极大改善了EPB的工作能力和适应性。

Taking the traditional pull lock EPB equipped with a commercial vehicle as the research object,without changing the structure of the pull lock EPB,a new dual EPB redundancy system which can adapt to the ramp parking condition of commercial vehicles is designed.The system realizes the isolation and interaction of the CAN information of the two EPBs by introducing the relay controller,and eliminates the signal interference of the dual EPBs in redundancy.At the same time,the bench test research shows that the dual redundancy system can greatly reduce the response time of EPB for parking braking force demand,which is about 470 ms higher than that of traditional pull-up EPB,and when the vehicle center line does not coincide with the ramp center line when the vehicle is parked.After being processed by the relay controller,the parking braking force can be distributed according to the needs of wheels on both sides,which greatly improves the working capacity and adaptability of EPB.