基于发动机外特性的CVT速比控制方法研究

Research on CVT Speed Ratio Control Based on External Characteristic of Engine

针对传统无级变速器速比控制中速比变化频繁,从而导致无级变速器效率低下、磨损严重等问题,研究了一种基于发动机外特性的速比控制方法,即在保证经济性与动力性的条件下限制无级变速器速比变化。理论研究和仿真分析结果表明,所提出的最佳经济区速比控制方法可以有效降低无级变速器速比调节频率,从而提高无级变速器效率与使用寿命。

To solve the problem of low efficiency and serious wear of CVT caused by frequent change of speed ratio of conventional CVT speed ratio control,a speed ratio control method based on external characteristic of engine was researched,e.g.to limit variation of CVT speed ratio under the condition of ensuring economy and power performance.The theoretical study and simulation analysis results indicate that the proposed speed ratio control method in the optimal economic area can effectively reduce the frequency of speed ratio regulation of CVT, thus improve CVT efficiency and service life.