Limited target gear ratio learning method of CVT

摘要

Disclosed is a method of learning a limit target gear ratio of a continuously variable transmission. The limit target gear ratio learning method according to the present invention, due to the running state of a continuously variable transmission (CVT) vehicle or the wear or deterioration of the adjacent surfaces of the pulley (drive pulley and driven pulley) and the belt,'manual power on/up/ This is to compensate for the shift delay or pulling phenomenon that may occur in the'Manual Power-on up/down shift' situation by learning the target gear ratio limit value, and whether the current state of the continuously variable transmission vehicle satisfies the learning entry condition. It includes a conditional judgment step to judge, and a learning step in which learning to correct the target gear ratio limit value is performed when the learning entry condition is satisfied, and in the learning step, the current gear ratio and the target gear ratio at the time of entering the learning step are captured. , The time it took for the current gear ratio to reach the set range close to the target gear ratio captured at the time of entering the learning phase in the situation where the Manual Power-on up/down shift is maintained is recorded as a timer value. , According to the recorded timer value, the slope of the target gear ratio limit value is differentially corrected to learn a new target gear ratio limit value.