旁通流量式ECHPS系统功率流模型与节能特性

Energy flow model and energy-saving characteristics of new type electronically controlled hydraulic power steering system

为了降低目前商用车广泛采用的液压助力转向(HPS)系统的能耗,设计了基于比例电磁阀控制旁通流量的新型电控液压转向(ECHPS)系统,研究了新型ECHPS系统在改善车辆操稳性的同时,在降低转向系统能耗方面的效果.分析了ECHPS系统各模块的功率平衡关系,基于Matlab/Simulink建立了ECHPS的功率流模型,采用模糊PID控制算法对ECHPS系统中比例电磁阀的阀芯位移进行控制,仿真分析了动态多工况下ECHPS系统的功耗,并进行了大客车ECHPS道路试验.结果表明:仿真结果与试验结果基本一致,所建的ECHPS系统功率流模型有效;与HPS系统相比,ECHPS系统在整车空载与满载试验时的功率损耗分别降低了7.0%和15.6%;驾驶员主观评价的整车高速路感得到明显改善.

To reduce the energy consumption of hydraulic power steering （ HPS） system in commercialvehicles,a new type electronically controlled hydraulic power steering （ ECHPS） system was designed based on the proportional solenoid valve by-pass flowcontrol. The handing stability and the efficiency ofnew type ECHPS were investigated. The power balance among all modules of ECHPS was analyzed. The energy flow model of ECHPS system was established in Matlab/Simulink with consideration of energysource feature of ECHPS. Using fuzzy PID strategy of proportional solenoid valve opening control, the multi-conditions were simulated, and the full-scale vehicle experiments were conducted. that the simulation results are consistent with the experimental results , which proves the efficiency ofenergy flow model. Compared with HPS system , the ECHPS system energy consumptions are reduced by 7. 0% and 15. 6% under no-load and full-load conditions , respectively. The sense of high-speed road from the view of driver subjective feeling is significantly improved.