Research on Shuffle Reduction Control in Dual Motor Hybrid System based on the Motor Torque Intervention Filtering Strategy

Due to the frequent and significant changes of the motor torque of hybrid vehicles during driving often occurring with the driving conditions, and the existence of the transmission tooth surface switching caused by the change in torque direction, as well as the underdamping characteristics caused by the relatively simple transmission system, the vehicle is prone to vehicle body shaking problems under conditions such as the transformation from acceleration conditions to energy recovery conditions, and exit from energy recovery. In order to ensure the ride smoothness of the hybrid vehicle while improving its power response performance, aiming at the underdamping characteristics of its transmission system, this paper develops a transmission PCM vibration suppression control strategy based on the vehicle control system to enhance the torque response and smoothness after Tip out or Tip in after braking. This strategy includes the identification of preconditions and the active intervention filtering control of the motor requested torque based on the ECM requested motor torque. The preconditions are that the vehicle speed is greater than a certain threshold, the brake pedal, the driving mode, and the driving mode recognition. The activation condition is that the accelerator pedal increases from 0 and the requested torque is greater than a calibrated value. The torque algorithm is that when the preconditions are met and the activation condition is established, the requested torque is guided according to the designed quadratic function. Through the establishment of a vehicle dynamics simulation verification environment, the simulation analysis of the motor torque intervention filtering control strategy was carried out, and the intervention filtering strategy was transplanted to the real-time control system for real vehicle tests. The simulation and real vehicle test results show that, compared with the active damping control strategy, the motor torque intervention filtering control strategy can better avoid the problem of starting jitter in the zero-torque condition of the entire vehicle and achieve a faster power response.