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为了降低挖掘机能耗,提高动力系统的效率,采用了混联式控制策略。由发动机、ISG电动机组成新的动力源,由超级电容供电的回转电动机取代传统的液压马达,构成了挖掘机的回转系统,并采用了超级电容作为储能元件。建立了ISG电动机和回转电动机的控制策略,对回转电动机同时给出了转矩控制和转速控制两种控制算法,由于ISG电动机与发动机直联,因此,着重研究其转速控制算法。结合试验数据分析得出,采用混联式控制策略不仅优化了动力系统的资源配置,回收了制动能量,达到了节能减排的目的,而且实际工作效果达到甚至超过了传统挖掘机。
In order to reduce the energy consumption of excavators and improve the efficiency of power system, a hybrid control strategy was adopted. By the engine, ISG motor composed of a new power source, supercapacitor-powered rotary motor to replace the traditional hydraulic motor, constitute the excavator rotary system, and the use of super-capacitor as the energy storage element. The control strategy of ISG motor and rotary motor is established. Two control algorithms of torque control and speed control are given for rotary motor. Because ISG motor and engine are directly connected, the speed control algorithm is emphatically studied. Combining with the experimental data, it is concluded that the hybrid control strategy not only optimizes the resource allocation of the power system, reclaims the braking energy, but also achieves the goal of energy saving and emission reduction. And the actual work effect reaches or surpasses the traditional excavators.