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:
Nov. 04, 2008
Filed:
Jun. 21, 2004
Yoshinari Kawahara, Fukuoka, JP;
Kousaku Ohno, Mito, JP;
Atsushi Yokoyama, Yamato, JP;
Mitsuhide Sasaki, Isehara, JP;
Yoshinari Kawahara, Fukuoka, JP;
Kousaku Ohno, Mito, JP;
Atsushi Yokoyama, Yamato, JP;
Mitsuhide Sasaki, Isehara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electrically operated brake device in which braking force differences between electrically operated brakes are reduced to prevent unstable vehicle traveling during braking. Motorsof electrically operated brakes are returned to standard positions during the stop of a vehicle and the motorof each of the brakes is driven for a predetermined amount, pressing a brake padagainst a disc rotorto produce a braking force. An electric current value of each motorin the above operation is measured and differences between the values are calculated. Electric current of each motor is increased or decreased so that there is no current difference between the motors. Based on a drive amount of each motor in this operation, standard positions of the motors are determined and updated. Repeating the above operations reduces braking force differences between the brakes.