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. 03, 2004
Filed:
Apr. 26, 2002
Jatco Ltd, Fuji, JP;
Abstract
A line pressure control system for an automatic transmission wherein a shift range is determined by selectively engaging friction elements by means of a line pressure controlled according to an input torque of said automatic transmission. In the present invention, an engine output torque at the front stage of the automatic transmission is estimated from the operating condition. The input torque of the automatic transmission is calculated from the estimated engine output torque and the operation state of a torque converter. The calculated input torque of the automatic transmission is decreased during a predetermined time corresponding to an estimation response delay of the engine output torque after the engine is made in a no-load state, so as to properly control the line pressure.