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:
Feb. 18, 2003
Filed:
Apr. 09, 2001
Keita Nakano, Itami, JP;
Sumitomo (SEI) Brake Systems, Inc., Mie, JP;
Abstract
A method of controlling a pump-driven type vehicle hydraulic brake system which can suppress pulsation of brake hydraulic pressure and makes it possible to accurately and quickly apply brake hydraulic pressure is provided. Using an equation between the pressure rising speed of the hydraulic pressure in the master cylinder and the approximate required driving force of the motor, the driving force of the motor is set from the pressure rising speed of the detected hydraulic pressure. The driving force of the motor is controlled to minimize the hydraulic pressure difference between the brake hydraulic pressure increased by the preset driving force and the hydraulic pressure in the master cylinder, thereby bringing the brake hydraulic pressure substantially close to the hydraulic pressure in the master cylinder. Only for the remaining hydraulic pressure difference, the motor driving force is controlled with a small control output to quickly and precisely apply brake hydraulic pressure while suppressing pulsation of the brake hydraulic pressure.