Model-based pitch control for distributed drive electric vehicle 2019-01-0451
On the dual-motor electric vehicle, which is driven by two electric motors mounted on front and rear axles respectively, longitudinal dynamic control and electro-dynamic braking can be realized by controlling the torque of front and rear axle motors respectively. Suspension displacement is related to the wheel torque, thus the pitch of vehicle body can be influenced by changing the torque distribution ratio. The pitch of the body has an important influence on the vehicle comfort, which occurs mainly during acceleration and braking progress. Traditionally active suspension is adopted to control the pitch of body. Instead, in this paper an ideal torque distribution strategy is developed to limit the pitch during acceleration and braking progress. This paper firstly explores the relationship between the torque distribution and the body pitch through the simulation and the real vehicle test, which reveals the feasibility of the vehicle comfort promotion by optimizing the torque distribution coefficient. A two-degree-of-freedom semi-vehicle model is established according to the actual vehicle parameters. Based on the vehicle model, the control system is established to minimize the pitching motion during the acceleration and braking process by means of a model predictive control technique. The control effect is verified by simulation experiment.
Yize Yu, Lu Xiong, Zhuoping Yu, Xing Yang, Yuye Hou, Bo Leng