四轮驱动汽车车轮驱动防滑的牵引力控制仿真分析

Simulation Analysis of Traction Control for Anti-slip Control of Four Wheel Drive Vehicle

为提高全时四轮驱动汽车的整车动力性和行驶稳定性,建立了发动机、轴间/轮间电控限滑差速器及相应的液压控制系统数学模型,设计了发动机目标转矩模糊控制器、轴间电控限滑差速器模糊控制器以及轮间电控限滑差速器PID控制器,提出了基于驱动防滑的全时四轮驱动汽车牵引力控制策略。应用所制定的牵引力控制策略,分别在低附着均一路面、对接路面、分离路面及上坡分离路面上对整车加速性能进行了仿真分析,结果表明,所制定的牵引力控制策略能够根据各驱动轮的滑转状态调节驱动轮的驱动力矩,有效地抑制了驱动轮的过度滑转,提高了汽车在恶劣路面的动力性和行驶稳定性,并有较好的适应性。

In order to improve the vehicle dynamics and driving stability of full-time 4WD vehicle, dynamic models of engine, inter-axle and inter-wheel electronic limited-slip differential and hydraulic system were established, engine target torque fuzzy controller, inter-axle torque distribution fuzzy controller and inter-wheel torque distribution PID controller were designed. Integrated traction con- trol strategy was proposed, and the acceleration performance was analyzed by simulating on low-~u road, step-/a road, split-/, road and ramp road. The results indicate that the strategy can regulate the drive torque quickly according to the slip of driving wheels, inhibit the excessive slip of driving wheels effectively, improve the dynamic performance and passing ability on bad roads obviously, and show a good adaptability.