泵控容积调速系统中负载发生变化时，要保证马达输出转速恒定。
When the load of pump control cubage timing system changes, the motor output speed must be kept steady.
因此对工程机械行走驱动泵控马达闭式回路系统及关键液压元件开展研究将有重大意义。
Therefore the research of pump-control-motor closed-circuit for mobile hydraulics driving system and key hydraulic components will have great significance.
利用阀控泵-马达同步系统可以保证旋压机两个旋轮的同步精度，以保证旋件的质量。
The synchro accuracy of two spinning wheels of spin forming machine can he obtained by using the synchro system of valve controlled pump-motor, therefore the quality of workpiece is ensured.
本文对变转速泵控马达液压系统进行了仿真分析，建立了系统中变频器、异步电动机、定量泵、马达以及负载的数学模型。
Simulation analysis was carried out for the variable speed pump-control-motor hydraulic system. Mathematic models of inverter, asynchronous motor, fixed pump and load were set up.
从仿真结果上看，LQR调节的性能优与PID控制，说明采用LQR调节器作为泵控马达恒速控制系统的控制方法是良好的。
In view of the result of simulation, LQR regulation is excellent to the PID control system, LQR regulation accuse as velocity steady controlling in the pump-controlled motor system is better.
从仿真结果上看，LQR调节的性能优与PID控制，说明采用LQR调节器作为泵控马达恒速控制系统的控制方法是良好的。
In view of the result of simulation, LQR regulation is excellent to the PID control system, LQR regulation accuse as velocity steady controlling in the pump-controlled motor system is better.
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