Research on Active Control of Vibration of Transmission System of Power-Split HEV

The transmission system of hybrid electric vehicles has the advantages of compact structure, high power density, good fuel economy and so on. It has become one of the main transmission systems of hybrid electric vehicles (HEV). This paper takes the transmission system of hybrid electric vehicles as the research object, aims to reduce the torsional vibration of the transmission shaft, and focuses on the research of vibration control mechanisms and active vibration control strategies. Firstly, the operating mode of the transmission system of the planetary hybrid electric vehicle was analyzed, and the torsional dynamics model with multiple degrees of freedom was established. The parameter sensitivity of the natural frequency of torsional vibration characteristics was analyzed, and the shafting stiffness parameters sensitive to low-frequency vibration characteristics were obtained. Secondly, to realize real-time control of engine excitation torque, an active control algorithm architecture is established, and a hybrid adaptive control algorithm of feedforward narrowband filtering and feedback broadband filtering is proposed. Finally, a verification simulation was carried out, and the vibration torque of the connecting shaft was suppressed by the adaptive filtering algorithm proposed, which verified the feasibility of the vibration adaptive active control algorithm using the motor as the actuator.