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. 06, 2001
Filed:
Dec. 14, 1999
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A creep torque is controlled in a non-finite speed ratio transmission device, wherein a planetary gear unit (,) varies a rotation direction of a final output shaft (,) according to a relative rotation of a toroidal continuously variable transmission (,) and fixed speed ratio transmission (,). The controller comprises a hydraulic cylinder (,) which varies the speed ratio of the toroidal continuously variable transmission (,) by driving a trunnion (,), a shift control valve (,) which supplies a hydraulic pressure to the hydraulic cylinder (,) according to a displacement position, a step motor (,) which displaces the shift control valve (,) according to a command signal, and a mechanical feedback member (,) which feeds back the speed ratio of the toroidal continuously variable transmission (,) to the shift control valve (,). The controller further comprises a sensor (,) which detects a running state of a vehicle, a sensor (,) which detects the real speed ratio of the continuously variable transmission (,), and a microprocessor (,) which outputs the command signal. When the vehicle running state corresponds to a predetermined state, the microprocessor (,) outputs a new command signal based on a required creep torque and the real speed ratio of the continuously variable transmission (,) to the step motor (,).