Nissan Motor Company Limited

Manzaburou Abe

Hiromasa Sakai

Yasushi Narita

Motoharu Nishio

Hiroaki Kuramoto

Tatsuya Nagato

In an infinite speed ratio transmission comprising a continuously variable transmission (,), reduction gear unit (,) and planetary gear set (,), the speed ratio of the continuously variable transmission (,) is controlled by a step motor (,). A range selected by a selector lever (,) is detected by a sensor (,). When the selected range has changed from a stationary range to one of a forward motion range and a reverse motion range, a microprocessor (,) first drives the step motor (,) to a predetermined position (S,, S,). Subsequently, by driving the step motor (,) to an operating position corresponding to a geared neutral point at which the output rotation speed of the infinite speed ratio transmission is zero (S,, S,, S,, S,, S,, S,), the undesirable effects of hysteresis occurring in a relation between the operating position of the step motor (,) and the speed ratio of the continuously variable transmission (,) according to a torque shift of the continuously variable transmission (,) are avoided.

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Kanagawa, Japan

Manzaburou Abe