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:
Jan. 30, 2007
Filed:
Sep. 26, 2003
Tateki Jozaki, Kanagawa-ken, JP;
Shigeru Ishii, Kanagawa-ken, JP;
Tatsuo Wakahara, Kanagawa-ken, JP;
Masahiro Yamamoto, Kanagawa-ken, JP;
Hiroyasu Tanaka, Kanagawa-ken, JP;
Youhei Ishikawa, Kanagawa-ken, JP;
Tateki Jozaki, Kanagawa-ken, JP;
Shigeru Ishii, Kanagawa-ken, JP;
Tatsuo Wakahara, Kanagawa-ken, JP;
Masahiro Yamamoto, Kanagawa-ken, JP;
Hiroyasu Tanaka, Kanagawa-ken, JP;
Youhei Ishikawa, Kanagawa-ken, JP;
Jatco Ltd., , JP;
Abstract
There are provided with a determination means for determining whether or not the correlation between the pressure value detected by the primary pressure sensor and the pressure value detected by the secondary pressure sensor is an actually impossible relation (Step), and a switchover means for switching over to an open control while prohibiting a feedback control when the correlation is determined to have become a relation actually impossible by the determination means (Step). Presence or absence of a fault to the primary pressure sensor or the secondary pressure sensor (particularly, fault of fixed output voltage) is judged based on the correlation between the output voltage of the primary pressure sensor and the output voltage of the secondary pressure sensor to prohibit the control of a primary pressure and a secondary pressure using the hydraulic pressure sensors when it is judged that there is a fault.