动态工况无级变速器与发动机协同控制研究

Cooperative Control Research Between Continuously Variable Transmission and Engine during Dynamic Condition

匹配无级变速器的整车通常有低速转速穿越顿挫、中途加速动力响应滞后等问题,容易引起客户抱怨。文章在分析无级变速器各动力传递部件扭矩传递特性的基础上,搭建了无级变速器的扭矩传递模型,并通过台架试验进行验证。针对低速工况转速穿越冲击问题,提出变速器降挡延迟与请求发动机降扭的协同控制方法;针对中途加速工况动力响应滞后问题,提出中大油门基于整车目标加速度和发动机实际扭矩的协同控制算法;此外,对于小油门加速工况,提出一种增扭算法,在保证动力需求的同时,改善燃油经济性以及减少硬件磨损。在相同工况下,实车试验数据表明,集成协同控制算法的变速器控制单元软件在整车性能上有较明显的改善,达到了设计预期。

There are some performance problems of acceleration jerk during low speed and acceleration response delay during middle or high speed happened on the vehicles equipped with continuously variable transmission,which bring many complains of customers.Based on the analysis of transmitted torque characteristics of components,the torque model is established and it is validated through platform experiment.Aimed at solving the problem of acceleration jerk during low speed,the method of downshift delay and toque reduction request is advanced.Aimed at solving the problem of acceleration response delay,cooperative control method based on target acceleration and engine actual torque during middle and big gas pedal is advanced.In addition,a torque increase algorithm is proposed to guarantee the power demand as well as improve fuel economy and reduce hardware wear under small gas pedal condition.In the same condition,the integration software of transmission control unit is validated through on-board experiment,and the performance of the vehicle and transmission are optimized.