管路布置对制动蓄能器充液性能的影响

Effect of Piping Layout on Liquid Filling Performance of Brake Accumulator

针对某采用定量泵驱动全液压制动系统的车辆在使用过程中存在的蓄能器充液频繁问题,利用AMESim仿真平台,结合现场管路布置情况,建立了制动蓄能器充液系统的HCD模型,对充液阀的出口压力和蓄能器的进口压力进行仿真,得出了管路中的沿程压力损失导致蓄能器的实际压力小于充液阀的上限压力,造成蓄能器中高压油容量不足,从而引起充液频繁现象。同时利用手持式压力流量测试仪在现场对充液阀的压力进行实际测试,得出了和仿真结果相近的结论。通过缩短管路长度和增加管路直径的方法,优化了蓄能器和充液阀的布置方位,确保蓄能器中储存的高压油容量能满足设计要求,最终解决了该车辆频繁充液的问题。

In view of the frequent problems of accumulator filling in the use of a vehicle driven by a quantitative pump,the HCD model of the brake accumulator filling system is established using the AMESIM policy platform and the layout of the pipeline in the field. The outlet pressure of the charging value and the inlet pressure of the accumulator are simulated. It is concluded that the pressure loss in the pipeline leads to the actual pressure of the accumulator less than the upper limit pressure of the charging valve,resulting in the shortage of high pressure oil in the accumulator,which causes the frequent phenomenon of liquid filling. At the same time,a hand-held pressure flow tester is used to test the pressure of the charging valve at the scene,and the conclusion is similar to that of the simulation. Through the method of shortening the length of the pipeline and increasing the diameter of the pipeline,the layout of the accumulator and the filling valve is optimized,and the high pressure oil capacity stored in the accumulator can meet the design requirements,and the frequent filling problem of the vehicle is solved.