Background: The torsional vibration of the power transmission system has heavy effect on the
ride comfort and safety of the vehicle, which has attracted plenty of research. Therefore, aiming at the torsional
vibration problem of the electric vehicle power transmission system, enough study on how to suppress
the torsional vibration is clearly of great benefit.
Objective: The goal of the work is to explore the new method to suppress the torsional vibration. The main
contribution is that the parameter of the power transmission system is optimized and the adaptive fuzzy PID
controller is proposed to be utilized and optimized to suppress the torsional vibration.
Methods: An optimization objective function including the angular acceleration of the motor shaft, the decelerator
and differential assembly and the half shaft is established as the output of the genetic algorithm
fitness value. The error combination of the square root of the angular acceleration of the motor shaft, the
decelerator and differential assembly and the half shaft is adopted as the input of the fuzzy inference controller
and the PID controller, which can significantly simplify the fuzzy rule and the structure of the controllers.
Results: The proposed method significantly reduces the torque amplitude of the motor shaft, the decelerator
and differential assembly, the transmission half shaft, and the overall vibration amplitude. The maximum
reduced vibration amplitude change is up to 41.22% and 87.04% respectively after parameter optimization
and fuzzy PID control in the example.
Conclusion: The comprehensive utilization of parameter optimization and adaptive fuzzy PID control
can successfully suppress the torsional vibration phenomenon of the power transmission system,
and the torsional amplitude of the angular velocity and angular acceleration decreases significantly.
Therefore, the vehicle noise can be reduced and the stability can be improved. The study lays a foundation
for solving the torsional vibration problem and the mechanical optimal design of the vehicle