The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2001
Filed:
Jul. 12, 2000
Hiroaki Kuramoto, Kanagawa, JP;
Motoharu Nishio, Kanagawa, JP;
Hiromasa Sakai, Kanagawa, JP;
Yasushi Narita, Kanagawa, JP;
Tatsuya Nagato, Kanagawa, JP;
Manzaburou Abe, Kanagawa, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
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.