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:
Oct. 22, 2013
Filed:
Mar. 12, 2009
Hideki Sekiguchi, Isesaki, JP;
Toshiya Oosawa, Atsugi, JP;
Satoru Watanabe, Isesaki, JP;
Tomoyuki Murakami, Isesaki, JP;
Akihiro Sato, Atsugi, JP;
Motohiro Higuma, Atsugi, JP;
Hideki Sekiguchi, Isesaki, JP;
Toshiya Oosawa, Atsugi, JP;
Satoru Watanabe, Isesaki, JP;
Tomoyuki Murakami, Isesaki, JP;
Akihiro Sato, Atsugi, JP;
Motohiro Higuma, Atsugi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A brake system provided with a brake booster using intake negative pressure of an engine for boosting a brake operating force for a vehicle. A requested braking force is detected base on an operating amount of a brake pedal, and when the requested braking force is less than a threshold value, a master cylinder pressure prevailing in the master cylinder using an operating force boosted by the brake booster is supplied to the wheel cylinder. On the other hand, when the requested braking force is greater than or equal to the threshold value, brake fluid pressure having been boosted by a pump is supplied to the wheel cylinder. The threshold value is set to a value that becomes greater the larger the negative pressure inside the brake booster.