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:
Jan. 22, 1991
Filed:
Oct. 25, 1988
Tetsuro Arikawa, Kanagawa, JP;
Nippon A B S, Ltd., Tokyo, JP;
Abstract
A brake fluid pressure control apparatus for a vehicle includes a fluid pressure control valve device arranged between a master cylinder and a wheel cylinder, receiving control signals from a control unit measuring the skid condition of the wheel to control the brake fluid pressure to the wheel cylinder. A hydraulic reservoir stores the brake fluid discharged through the fluid pressure control valve device from the wheel cylinder and a pressure fluid supply conduit connects the master cylinder with the fluid pressure control valve device. A fluid pump returns the brake fluid from the hydraulic reservoir into the pressure fluid supply conduit and a valve apparatus is arranged in a conduit connecting the discharge side of the fluid pump with the master cylinder side, in the pressure fluid supply conduit. The valve apparatus takes a first position connecting both sides and a second position that cuts off the fluid flow from the discharging side of the fluid pump toward the master cylinder side. The valve apparatus is normally in the first position. During anti-skid control, it takes the first position continuously for a certain time depending on the control time of the fluid pressure decrease and continuously for another certain time depending on the control time if the fluid pressure is increased after the fluid pressure decrease, and it takes the second position continously for times other than the certain time and/or the other certain time. Alternatively, it cycles between the first and second position for a certain time depending on the control time of the fluid pressure decrease and/or for another certain time depending on the control time of increasing again the fluid pressure after the fluid pressure decrease, and it takes the second position for times other than the certain time and/or the another certain time.