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为充分发挥工程车辆用发动机及液压系统的工作性能,并同时提高其在动态条件下的功率传递效率,对发动机-变量泵-变量马达(三变量)组成的串联型液压驱动系统控制策略进行研究.对驱动系统各个部分进行参数匹配,确定各环节的额定计算工况;提出自适应分层控制策略,以系统效率最大化为目标,主动调节发动机、变量泵以及变量马达的工作点,主动适应负载功率需求.在MATLAB/Simulink软件中对系统进行后向建模,仿真结果表明,所提出的控制策略能够有效地保证系统高效率的功率传递,通过优化发动机工作点降低油耗.
In order to give full play to the working performance of engine and hydraulic system of engineering vehicles and improve the power transfer efficiency under dynamic conditions at the same time, the control strategy of series hydraulics driving system consisting of variable displacement pump and variable displacement motor (three variables) The parameters of each part of the drive system are matched to determine the rated working conditions of each link. An adaptive stratified control strategy is proposed to maximize the system efficiency and actively adjust the operating points of the engine, variable displacement pump and variable motor, Load power demand.The system is modeled backwards in MATLAB / Simulink software. The simulation results show that the proposed control strategy can effectively ensure the efficient power transfer of the system and reduce fuel consumption by optimizing engine operating point.