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:
Feb. 16, 1999
Filed:
Mar. 07, 1997
Makoto Sawada, Atsugi, JP;
Hirofumi Okahara, Isehara, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
In a continuously variable transmission (CVT) for a vehicle wherein a belt of V-shaped cross-section is looped around a drive pulley and a driven pulley respectively having grooves of identical shape to this belt, and the width of the groove of each pulley is varied according to a supplied oil pressure, an oil pressure when an accelerator pedal is released is maintained at or above a predetermined value. The oil pressure is controlled according to a torque input to the drive pulley, and the input torque varies according a depression amount of the accelerator pedal. As a result, the speed change ratio easily varies due to insufficient oil pressure when the accelerator pedal is released. This invention stops decline of oil pressure when the accelerator is released, and thereby prevents variation of the speed change ratio due to release of the accelerator pedal. This is especially useful when the speed change ratio of the transmission has been fixed by the driver in a manual speed change mode.