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:
May. 20, 2014
Filed:
Mar. 10, 2011
Norihiro Saita, Atsugi, JP;
Taichi Shibata, Atsugi, JP;
Masamichi Imamura, Atsugi, JP;
Shinichiro Nishida, Zama, JP;
Satoshi Doi, Atsugi, JP;
Tadaharu Yokota, Atsugi, JP;
Norihiro Saita, Atsugi, JP;
Taichi Shibata, Atsugi, JP;
Masamichi Imamura, Atsugi, JP;
Shinichiro Nishida, Zama, JP;
Satoshi Doi, Atsugi, JP;
Tadaharu Yokota, Atsugi, JP;
Hitachi Automotive Systems, Ltd., Ibaraki, JP;
Abstract
A hydraulic pressure control apparatus has an electromagnetic valve having a valve body forced to one side by an elastic member and a coil driving the valve body to the other side; a hydraulic pressure control section for calculating a command current value to drive the electromagnetic valve and controlling a hydraulic pressure in a hydraulic circuit by opening/closing the electromagnetic valve; a current detection section detecting a value of the current passing through the coil; and a command current value correction section. The command current value correction section detects a change of an inductance of the coil when the valve body moves from the one side to the other side or from the other side to the one side through the current detection section, and corrects the command current value using the detected inductance change.