Transient Torsional Vibration Characteristic Analysis and Active Suppression of PHEV with Planetary Coupled Transmission System during Mode Transition Process

doi:10.3901/JME.2023.04.173

Abstract

Abstract: The coupled multi-source and wide-band excitations exist in the process of mode transitions of planetary-coupled PHEV, and it may cause large transient torsional vibration and significantly deteriorate the driving quality. This research takes the planetary-coupled PHEV as the studied object, the transient torsional vibration model of hybrid powertrain is built, where the nonlinear meshing stiffness of gears, tooth-side clearance and sliding of clutch are taken into consideration; for the typical operation conditions with engine start, based on the continuous wavelet transformation, a full-band influence analysis of transient torsional vibration is carried out for various excitation factors, then a hybrid model predictive controller considering gear vibration characteristics is developed to actively suppress the transient torsional vibration. The result shows that the tooth drop-collision caused by tooth clearance would stimulate the low-frequency torsional vibration at 10-100 Hz (longitudinal impact in whole vehicle level) as well as lead to high-frequency torsional vibration at 10-100 kHz (torque fluctuation in coupling system level), whereas the nonlinear fluctuations of gear stiffness primarily influence the high-frequency torsional vibration. The proposed hybrid model predictive controller considering the characteristics of torsional vibration can reduce 47.8% of the peak value of vehicle impact and 33.2% of root mean square value of torsional acceleration, which indicate the considerable elevation of driving comforts and service life of power coupling device for hybrid powertrain.

Key words: hybrid electric vehicle, meshing stiffness, backlash, morlet wavelet transform, hybrid model predictive control

CLC Number:

U461

WANG Feng, ZHANG Jian, XU Xing, WANG Chunhai, QUE Hongbo, GAO Yang. Transient Torsional Vibration Characteristic Analysis and Active Suppression of PHEV with Planetary Coupled Transmission System during Mode Transition Process[J]. Journal of Mechanical Engineering, 2023, 59(4): 173-189.

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