变转速输入定量泵-恒转速输出变量马达系统恒转速控制方法研究

以变转速输入定量泵-恒转速输出变量马达容积调速系统为研究对象,提出变转速输入定量泵-恒转速输出变量马达容积调速系统的控制方法。建立恒流状态下系统恒转速控制的数学模型,分析系统的相乘非线性特征与变量马达斜盘摆角基准值的计算方法,采用稳态控制量叠加基于小信号线性化补偿控制量的控制方法。通过定量泵-变量马达系统的开环辨识,得到系统参数。对系统进行仿真与试验研究,得到在恒流状态下变量马达斜盘阀控缸的响应速度、马达斜盘摆角和定量泵转速对系统控制特性的影响规律,验证变转速输入定量泵-恒转速输出变量马达容积调速系统的控制方法的有效性。为拓展定量泵-变量马达容积调速系统应用领域奠定了理论基础。

Constant Speed Control Method of Variable Speed Input Fixed Displacement Pump-constant Speed Output Variable Motor System

Based on the variable speed input fixed displacement pump-constant speed output variable motor volumetric speed control system, the constant speed control method is proposed. The mathematical model of constant speed control is established. The multiplying nonlinear characteristics and the calculation method of the variable motor swashplate angular basic value of the system are analyzed. The control method of using the steady state control value superimposing small signal linear compensation control value is used. Through the open-loop identification of fixed displacement pump-variable motor system, the system parameters are gotten. In addition, the influence law of the variable motor valve controlling cylinder response speed, motor swashplate angular and fixed displacement pump speed, to the control system are simulated and examined in constant current state. The control method is verified in the variable speed input fixed displacement pump-constant speed output variable motor volumetric speed control system. This experiment lays a theoretical foundation for expanding fixed displacement pump-variable motor volumetric speed control system applications.