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:
Apr. 13, 1993
Filed:
Jul. 17, 1992
Takeshi Kitagawa, Kyoto, JP;
Hiroshi Takuma, Kameoka, JP;
Shoji Kan, Kyoto, JP;
Yoichi Furuichi, Kyoto, JP;
Takahiro Taki, Kyoto, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
In an automatic transmission for a vehicle having at least one frictional engaging element and an electromagnetic valve to control hydraulic pressure supplied to the frictional engaging element and achieving a plurality of speed ratios including a predetermined speed ratio achieved by engaging the frictional engaging element, a shift control apparatus includes retardation rate detection means for detecting retardation rate of the vehicle and electromagnetic valve control means for controlling the electromagnetic valve according to the value detected by the retardation rate detection means, and hydraulic pressure supplied to the frictional engaging element is corrected by the electromagnetic valve through electromagnetic valve control means according to the retardation rate of the vehicle detected by the retardation rate detection means, thereby reducing speed-shift shocks during a down-shift in association with retardation of the vehicle.