基于CAN总线电传动车辆辅助电气系统设计分析

Design and Analysis of Auxiliary Electrical System of Electric Drive Vehicle Based on CAN Bus

电传动自卸车辆的辅助电气主要完成车辆仪表、灯光、雨刮、液压逻辑等控制功能以及为整车弱电设备提供电源,主要采用点对点模式,原理简单但存在着整车线束数量多、检修困难、难以维护保养等诸多弊端。针对存在的问题,提出分布集中式的辅助电气模式;对系统布线进行设计,根据各部分功能和布置的不同,采用分布式和传统点对点连接方式相结合的方法,降低整车线束的复杂程度;对辅助电气系统进行设计,设计控制器和端口程序,并对主控制器线路和液压控制器线路进行设计,使其满足整车的使用需求;对辅助电路进行仿真实验,选取机油压力检测和整车紧急双移线试验进行各辅助电路测试。结果可知:机油泵转速、机油温度和机油压力的检测准确度高,误差小于1%;整车实际运行轨迹与理想双移线运行轨迹有较好的吻合;辅助电路能够实现设计的控制机理,顺畅的信号流,CAN总线的网络能够保证正确的通信,准确性和实时性得到实现;为此类设计提供参考。

The auxiliary electric of the electric drive dump truck mainly completed the control functions of the vehicle instrument,light,wiper,hydraulic logic and the power supply for the weak equipment of the whole vehicle.It mainly adopted the point-to-point mode.The principle was simple,but there were many defects such as too many wiring harness,difficult maintenance.Aiming at the existing problems,a distributed centralized auxiliary electrical mode was proposed and cabling system was designed.According to the different functions and arrangements of each part,the combination of distributed and traditional point-to-point connection method was adopted to reduce the complexity of the vehicle wiring harness.The auxiliary electrical system was designed,the controller and port program was designed,and the main controller circuit and the hydraulic controller circuit were designed to meet the requirements of the whole vehicle.The auxiliary electrical system was simulated;the oil pressure test and the emergency double shift line test were selected for each auxiliary circuit test.The results show that the detection accuracy of oil pump speed,oil temperature and oil pressure is high,and the error is less than 1%;the actual running trajectory of the vehicle is in good agreement with the ideal double-shift line trajectory;the auxiliary circuit can realize the control mechanism of the design.Smooth signal flow,CAN bus network can ensure correct communication,accuracy and real-time performance;provide a reference for such design.