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. 16, 1993
Filed:
Aug. 09, 1991
Makoto Sato, Saitama, JP;
Hiromi Inagaki, Saitama, JP;
Wataru Saito, Saitama, JP;
Kazuya Sakurai, Saitama, JP;
Koichi Hagiwara, Nagano, JP;
Makoto Horiuchi, Nagano, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Nissin Kogyo Kabushiki Kaisha, Ueda, JP;
Abstract
A hydraulic braking pressure control system includes a shut-off valve (4) which is provided in an oil passage (58) connecting a brake device with an output port in a master cylinder and which is brought into a closed state by a control circuit when a braking operation is detected by an operation-amount detector, and a locking device (5) for inhibiting the closing of the shut-off valve when the output hydraulic pressure from a hydraulic pressure supply source in equal to or less than a predetermined value. The shut-off valve is opened when there is no braking operation, thereby ensuring that even if a hydraulic pressure is delivered from a hydraulic pressure control valve when there is no braking operation, such hydraulic pressure can be released into a reservoir. In addition, if the hydraulic pressure in the hydraulic pressure supply source is abnormally reduced, that shut-off valve is locked in its opened state by the locking device to ensure that the output hydraulic pressure from the master cylinder can be applied to the brake device.