合理选择关键参数提高液压再生制动能量回收率

针对半挂车制动器磨损严重、能量损耗等问题,对半挂车的再生制动系统进行了研究,提出了液压蓄能器式再生制动系统。通过建立仿真模型,并针对制动与驱动工况建立数学模型,分析蓄能器容积与预充压力、泵/马达排量对液压再生制动系统的影响。研究结果表明,增大泵/马达排量,能提升制动能量回收效率;制动能量回收效率随着蓄能器的容积大小而不同;蓄能器预充压力增大,制动距离短,但不利于制动能量的回收与驱动位移的增加。再生制动系统能增加半挂车的行驶位移,提高燃油经济性,为液压混合动力研究提供了参考。

Reasonable Selection of Key Parameters to Improve the Recovery Rate of Hydraulic Regenerative Braking Energy

Aimed at solving the problem of severe wear and energy consumption, the regenerative braking system of semitrailer is studied. The hydraulic regenerative braking system with accumulator is put forward. Through the establishment of simulation model and mathematical model for braking and driving conditions, the influence of the accumulator volume and pre-charge pressure, the displacement of the pump/motor on the semitrailer are analyzed. The results show that the increase of the pump/motor displacement can improve the braking energy recovery efficiency; the brake energy recovery efficiency is different with the size of the accumulator; the accumulator’s pre-charge pressure increases, and then the braking distance shortens, but it is not conducive to the recovery of braking energy and the increase of driving displacement. Hydraulic regenerative braking system can increase the displacement of the semitrailer, and improve the fuel economy in the drive process, which provides reference for the development of hydraulic hybrid vehicle.