Adaptive Phase Compensation Method for Main Harmonic Disturbance in Electromechanical Transmission
The electromechanical transmission has been applied to heavy vehicles due to its high-power density and wide speed range.However,as the main power source of the engine,the severe fluctuation of crankshaft torque causes system torsional vibration,which affects driving smoothness and durability.Traditional mechanical dampers cannot adjust characteristics in real-time,and vibration attenuation effect is limited.A torsional vibration reduction method for automotive electromechanical transmission based on motor torque adaptive compensation is studied.This method solves the time delay problem of the engine's main harmonic disturbance feedforward compensation signal by reconstructing the disturbance signal.Firstly,a dynamic model of electromechanical transmission considering shaft elasticity and an engine transient torque model are established,and the vibration characteristics were analyzed;Secondly,the complex vector analysis is applied to determine the optimal compensation conditions for engine in the dual motor feedforward control scheme.The mechanism of torque compensation error in active control is revealed through sensitivity analysis.Then,an adaptive phase correction method based on PI regulator was proposed for the phase deviation of the feedforward control signal,this method achieves phase compensation by reconstructing the excitation signal.Finally,numerical simulation and rapid control prototype experiments are conducted.The results indicate that the delay phase error in the feedforward control system is the main factor leading to the degradation of control efficiency.The use of adaptive PI regulator can effectively eliminate the delay phase error,thereby reducing the amplitude of torque fluctuation in the drive system and ensuring the smooth operation.
electromechanical transmissionhybrid vehicletorsional vibration compensationvibration suppressionadaptive control
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