车用大功率柴电机组机电耦合动力学特性及控制

The high-power diesel generator set for vehicles is the power supply unit of heavy-duty series hybrid electric vehicles. Due to the coupling effect of the torque impact of multi-cylinder diesel engine crankshaft and the electromagnetic torque pulsation of generator, the system torsional vibration phenomenon is prominent, and the dynamic quality is poor. A dynamic model of engine-generator set considering the electromechanical coupling effect is established, and the influence of electromechanical coupling effect on the inherent characteristics of the system is analyzed. The law of variation of torsional vibration characteristics with the parameters, such as electromagnetic stiffness, rotor eccentricity and torsional damper stiffness, is revealed. The dynamic response characteristics of the system under the combined excitation of engine and motor are analyzed,and the order of the main response is clarified. A torsional vibration control overall framework based on dual loop decoupling is proposed to solve the problem of excessive low-frequency torsional vibration response. An independent modal space optimal controller for the start stop process and an adaptive filtering compensating controller for steady-state operating conditions are designed for the suppression of engine main harmonic disturbances, and are verified through simulation. The results show that the proposed torsional vibration active control algorithm can achieve the suppression of main harmonic torsional vibration in the full speed domain of the engine.