Abstract：In order to eliminate the do-nothing control on the ratio of the metal belt continuously variable transmission（CVT） system, improve the driving stability and reduce the power consumption due to the ratio undulation, a new and discrete control strategy was established. The optimal control curves of economy and performance on the continuously variable transmission system were described, and the disadvantages of the conventional control strategy in jamming condition were analyzed. The influence of the throttle opening and roll resistance on the ratio and jerking of CVT system was simulated. A new discrete control strategy was used to reduce the jamming by the external condition. The results show that the wave ratio will be reduced and the work efficiency of the CVT hydraulic control system will be improved by the discrete control strategy.
2009, Vol. 30 
