介绍了HA(高压自动变量)马达基本工作原理,阐述了马达最小排量的选定原则,对比分析了马达变量起调压力对整车速度及加速性能的影响,最终通过合理设置马达最小排量及变量起调点,提高了液压系统的驱动效率及整车的动力性。 The basic working principle of HA (high pressure automatic variable) motor is introduced, the selection principle of minimum displacement of motor is expounded, and the influence of the starting pressure of motor variable on the speed and acceleration performance of the vehicle is analyzed and compared. Finally, And variables from the transfer point, improve the hydraulic system’s drive efficiency and vehicle power.