Vibration Control Method for an Electric City Bus Driven by a Dual Motor Coaxial Series Drive System Based on Model Predictive Control

Abstract

The response characteristics of the motor of an electric bus have many differences compared with those of traditional vehicle engines. During frequent acceleration and deceleration, the torque mutation has a severe impact on the transmission system because of the sensitive response characteristics of the electric bus motor. In this paper, an example of an electric city bus driven by a double-motor coaxial series drive system is presented. To reduce the impact on the transmission system caused by motor torque mutation, a model predictive control (MPC) algorithm for vibration suppression of an electric city bus is proposed. In order to deduce the state equation and output equation of the transmission system, the model of transmission system is simplified, and based on the MPC method we describe the multi-objective problem as a weight objective function to obtain the MPC law to solve the optimization problem. In addition, we design a transmission control-MPC controller to achieve vibration control based on the MPC within vehicle control unit (VCU), and then improve the performance of the dynamic response of the transmission system. Finally, simulation and vehicle testing are used to verify the effect of the algorithm. The result shows that the torque control algorithm based on the MPC has a positive effect on suppressing vibration under certain weighting conditions.

Keywords

• Double motor coaxial series drive system
• electric vehicle(EV)
• model predictive control(MPC)
• TC-MPC controller
• transmission system
• vibration control