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:
Aug. 26, 2014
Filed:
Feb. 28, 2012
Hiroki Takeda, Kanagawa, JP;
Tohma Yamaguchi, Kanagawa, JP;
Hiroki Takeda, Kanagawa, JP;
Tohma Yamaguchi, Kanagawa, JP;
Hitachi Automotive Systems, Ltd., Ibaraki, JP;
Abstract
A controller sets a target hydraulic pressure of a master cylinder based on the operation amount of a brake pedal, and controls the action of an electric motor so that a master cylinder hydraulic pressure attains the target hydraulic pressure. A brake characteristic representing a relationship between a motor rotation position detected by a resolver and the master cylinder hydraulic pressure as detected by the hydraulic pressure sensor is stored and updated. When the hydraulic pressure sensor is abnormal, a target motor rotation position corresponding to the target hydraulic pressure is set using the updated brake characteristic, and the action of the electric motor is controlled. The electric motor is controlled based on the updated brake characteristic, and hence fluctuations in the vehicle deceleration with respect to the brake operation can be suppressed and a sense of discomfort for the driver can be alleviated.