汽车模糊控制换挡策略仿真研究

针对自动变速器模糊控制换挡过程中的换挡循环问题,设计了一种新的模糊控制策略.将实验得出的换挡规律曲线分解为升挡规律曲线和降挡规律曲线,并设计了2个相应的模糊控制器.提出以加速度的正负作为控制器起作用的控制参量——加速度为正时系统由升挡控制器控制,加速度为负或0时系统由降挡控制器控制,建立了仿真模型并实现了控制策略.为验证所设计的模糊换挡策略的正确性和可行性,进行了仿真.仿真结果表明,采用这种换挡策略,汽车即使在复杂的路况下行驶,仍然能有效地避免换挡循环,获得最佳的动力性和经济性.

Simulation Research on Fuzzy Shift Strategy of Automobile

In order to avoid shift cycle in the process of fuzzy control for automatic transmission shift,a new fuzzy control strategy was designed.A shift map obtained from an experiment was divided into an upshifting map and a downshifting map,and two corresponding fuzzy controllers,upshifting controller and downshifting controller,were designed.It was put forward that the controllers should work in the light of the acceleration,i.e.,the system is controlled by the upshifting controller when the acceleration is positive,and it is controlled by the downshifting controller when the acceleration is negative or zero.A simulation model was built to achieve the control strategy,and a simulation was carried out to validate the correctness and feasibility of the fuzzy shift strategy designed.The simulation result shows that an automobile with this shift strategy can effectively avoid shift cycle even if it is running in a complicated driving condition and this shift strategy can obtain the optimal power and economic performances.