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. 20, 2015
Filed:
Mar. 22, 2013
Advics Co., Ltd., Kariya-shi, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Masaki Maruyama, Nagoya, JP;
Yoshio Masuda, Kariya, JP;
Akitaka Nishio, Kariya, JP;
Akira Sakai, Toyota, JP;
Yasuji Mizutani, Toyota, JP;
Kiyoyuki Uchida, Konan, JP;
Masaaki Komazawa, Miyoshi, JP;
Yusuke Kamiya, Okazaki, JP;
ADVICS CO., LTD., Aichi-Pref., Kariya-Shi, JP;
Abstract
A vehicle brake system includes a cylinder, a master piston including a pressure applying piston and a projection portion, a servo chamber, a contact/separation determining means determining a separated state and a contact state between the input piston and the master piston, a pilot pressure generating device generating a pilot pressure, a servo pressure generating device, a servo pressure measuring device measuring a servo pressure, and a master pressure estimating means estimating a master pressure from the pilot pressure and a first servo ratio, which is a cross-sectional area ratio between a first pilot chamber and a servo pressure generating chamber, in a case of the separated state, and estimating the master pressure based on the servo pressure, the pilot pressure and a second servo ratio, which is a cross-sectional area ratio between a second pilot chamber and the servo pressure generating chamber, in a case of the contact state.