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:
Jul. 14, 1998
Filed:
Aug. 27, 1996
Hiroshi Nakashima, Nishio, JP;
Toshiaki Hamada, Okazaki, JP;
Tadashi Terazawa, Toyota, JP;
Yuichiro Sakakibara, Hekinan, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
The invention is directed to a pressure supply system which has a fluid pump, an electric motor for driving the fluid pump to supply a hydraulic pressure in proportion to a current fed to the motor, and an accumulator for accumulating the hydraulic pressure supplied from the fluid pump. The pressure supply system includes a current detection device which detects the current fed to the motor, and a malfunction detection device which detects a malfunction of the pressure supply system on the basis of the output of the current detection device. The malfunction detection device is adapted to determine that the malfunction occurs when an increasing rate of the current fed to the motor is less than a predetermined rate, preferably after a predetermined time elapsed from the time when the current initially fed to the motor. The pressure supply system may further include such a warning device as a lamp or a buzzer, which will be activated when the malfunction detection device detects the malfunction of the system.