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:
Jun. 04, 2002
Filed:
Sep. 29, 2000
Yasutaka Kawamura, Atsugi, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In a line pressure control unit of an automatic transmission for a vehicle which performs feedback control of a line pressure of an automatic transmission, comprising: a line pressure solenoid valve( ) which adjusts a line pressure, a sensor which detects a real line pressure and a microprocessor ( ) which controls the line pressure solenoid valve. The microprocessor is programmed to: calculate a required line pressure(P ) according to the running state of the vehicle, calculate a target line pressure(P ) from the required line pressure(P ), the target line pressure(P ) being modified by a safety factor(S ) for line pressure correction, and calculate a line pressure difference(&Dgr;P ) between the required line pressure(P ) and the real line pressure(P ) and add a feedback control amount(&Dgr;P ) according to the line pressure difference to the target line pressure to calculate a command line pressure(P ) control the line pressure valve based on the command line pressure(P ).