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:
May. 07, 2002
Filed:
Sep. 29, 2000
Yasutaka Kawamura, Atsugi, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A clutch ( ) which connects an engine to a toroidal continuously variable transmission ( ) is engaged and transmits a torque to the transmission ( ) according to a line pressure. The toroidal continuously variable transmission ( ) transmits the torque also according to the line pressure. A microprocessor ( ) calculates a first pressure required to engage the clutch ( ) in the idle running state of the engine ( ), calculates a second pressure required for torque transmission of the clutch ( ) based on a torque transmission amount of the clutch ( ) (S ), and calculates a third pressure required for torque transmission of the continuously variable transmission ( ) based on the torque transmission amount of the clutch ( ) and the speed ratio of the continuously variable transmission ( ) (S ). Insufficiency of line pressure when the vehicle starts is prevented by controlling the line pressure to be equal to the maximum value of the first pressure, second pressure and third pressure when the load of the engine ( ) is equal to a greater than a first set value until a first set time has elapsed after the supply of the line pressure to the clutch ( ) is started.