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:
Sep. 16, 2014
Filed:
Feb. 18, 2010
Norikazu Matsuzaki, Minami-alps, JP;
Toshiyuki Innami, Mito, JP;
Kimio Nishino, Minami-alps, JP;
Ayumu Miyajima, Hitachinaka, JP;
Toshiyuki Ajima, Tokai, JP;
Masayuki Kikawa, Kai, JP;
Norikazu Matsuzaki, Minami-alps, JP;
Toshiyuki Innami, Mito, JP;
Kimio Nishino, Minami-alps, JP;
Ayumu Miyajima, Hitachinaka, JP;
Toshiyuki Ajima, Tokai, JP;
Masayuki Kikawa, Kai, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
A brake system which can secure quietness in a passenger compartment is provided. A vehicle brake systemincludes a brake assist devicewhich boosts a pressing force on a brake pedalby drive of a motor, and an assist control unitwhich controls the motor. The assist control unitchanges responsiveness of the motorin accordance with a vehicle speed, and sets a dead zone amount and a filtering value to large values in a region with a low vehicle speed. Thereby, responsiveness of a boosting operation of the motorto the operation of the brake pedal is made low, and a rotational variation and a vibration are prevented from occurring to the motorby a minute variation of a detection signal of a stroke sensorduring low-speed traveling or stoppage of traveling.