电液比例变量泵控定量马达调速特性研究

以电液比例变量泵-定量马达恒速控制系统为研究对象,详细阐述了变量泵电液比例变量机构的控制原理,分析了变量泵的斜盘机构受力情况,推导了变量机构和泵控马达系统的数学模型.分别在仿真软件MATLAB/Simulink和AMESim上建立变量机构和变量泵控马达系统的仿真模型,对变量机构响应时间和马达输出转速响应进行了仿真研究和试验对比.利用发电机为恒转速负载,进行了实车试验.在突加/突减16 kW负载的试验中,马达转速在3 s内恢复到设定值,稳态的波动率为0.29%,瞬态调整率为6.0%.分析结果表明,电液比例变量泵控马达系统作为柴油机和恒转速负载之间的调速机构和动力传递纽带是可行的.

Research on Speed Adjustment Characteristics of a Fixed Displacement Motor Controlled by Electro-hydraulic Proportional, Variable Displacement Pump

Taking a constant speed control system composed of electro-hydraulic proportional, variable displacement pump and fixed displacement motor as a research objective, control principle of a electro-hydraulic proportional variable mechanism with variable displacement pump is expatiated. Loading condition of swashplate of variable displacement pump is analyzed and mathematical models of the variable mechanism and pump controlled motor system are derived. Simulation models are established for them respectively with MATLAB/Simulink and AMESim simulation software. Simulation and test comparison are conducted on variable mechanism response time and motor output speed. A practical test is carried out with an electric generator as a constant speed load. In the test of sudden increment/reduction of 16 kW load, the motor speed returns to the setting value in three seconds, the stable state fluctuation ratio is 0.29% and transient adjustment ratio is 6.0%. Analysis results show that it is feasible for electro-hydraulic proportional, variable displacement pump controlled motor system to be used as a speed adjusting device or a power transferring tache between diesel engine and constant speed loads.