基于CVT效率的动力性控制策略优化算法

Optimization Algorithm of Dynamic Control Strategy based on CVT Efficiency

传统的无级变速器(Continuously Variable Transmission,CVT)动力性控制策略以最大发动机功率为控制目标。由于CVT效率在不同负载下变化较大,故控制发动机功率最大并不能保证此时的整车驱动功率也达到最大。为此,设计了矩阵优化算法,以最大整车驱动功率为目标,计算得到各踏板开度及车速下的CVT动力性速比。利用GT-drive软件建立整车模型,对优化前后的控制策略进行仿真对比分析。结果表明,优化后的控制策略使汽车在各个踏板开度下,整车驱动功率和最高车速都有不同程度的提升。

The traditional Continuously Variable Transmission(CVT)dynamic control strategy takes the maximum engine power as the control target. As CVT efficiency varies greatly under different loads,the maximum engine power cannot guarantee the maximum driving power at the same time. For this,the matrix optimization algorithm is designed to calculate the CVT dynamic speed ratio under different pedal opening and vehicle speed with the maximum driving power as the target. A whole vehicle model is established by using GT-drive software,and the control strategies before and after optimization are simulated and compared. The result indicates that the optimized control strategy can improve the driving power and the maximum vehicle speed to different degrees under each pedal opening.