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:
Dec. 17, 2002
Filed:
Dec. 21, 2000
Akitomo Suzuki, Anjo, JP;
Kenichi Tsuchida, Anjo, JP;
Masaaki Nishida, Anjo, JP;
Masahiro Hayabuchi, Anjo, JP;
Takayuki Hisano, Anjo, JP;
Takahiro Inoue, Anjo, JP;
Aisin AW Co., Ltd., Anjo, JP;
Abstract
To make it possible to maintain speeds during failures in an automatic transmission that does not have exclusive friction elements corresponding to the attainment of each speed. The hydraulic control apparatus of an automatic transmission, provided with control means for supplying regulated pressure to each of the hydraulic servos that are first through fourth friction elements to which hydraulic pressure is supplied from the oil path L , and provided with switching valves ( )-( ) for cutting off the supply of hydraulic pressure to friction elements other than the friction elements that engage in each speed, on the upstream side of the supply paths L , L , L , L and L . Each switching valve is switched by hydraulic pressure (C -C , B pressures) regulated by the control means that achieve regulated pressure operating conditions during failures, and selective application of signal pressure (Sol, SolB, SoIC pressures) output by the control means as operating means. In a speed that has been attained, the supply path to friction elements that are not to be engaged is cut off. Through this, even during failures the regulated pressure action of the control means corresponding to friction elements that are not to be engaged is ineffective, so the speed that has been attained is fixed.