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:
Jan. 21, 2003
Filed:
Aug. 30, 2001
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An automatic transmission for a vehicle comprises a torque converter TC equipped with a lock-up clutch This automatic transmission further comprises FIRST˜FOURTH speed clutches for a shift control executing a shift from off-going speed ratio to an on-coming speed ratio by controlling the release of the hydraulic pressure from the off-going clutch and by controlling the supply of the hydraulic pressure to the on-coming clutch. A control system comprises first and second off-going pressure releasing valves and which release the hydraulic pressure from the off-going clutch during the shift, a lock-up control valve and a lock-up timing valve which control the engagement of the lock-up mechanism, and a linear solenoid valve which supplies a control pressure to these valves and controls the operation of these valves.