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:
Apr. 14, 2009
Filed:
Apr. 13, 2004
Masahiro Shige, Toyota, JP;
Tadaichi Matsumoto, Okazaki, JP;
Shigeto Kajiwara, Toyota, JP;
Hideki Kashiwagi, Nagoya, JP;
Masahiro Shige, Toyota, JP;
Tadaichi Matsumoto, Okazaki, JP;
Shigeto Kajiwara, Toyota, JP;
Hideki Kashiwagi, Nagoya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Denso Corporation, Kariya, JP;
Abstract
The measurement precision of a current detector of the fuel cell in a fuel cell system is improved. Where the fuel cell systemhas not started operation, the vehicleis operating under regenerative operation, the fuel cellis operating under intermittent operation, or operation of the fuel cell systemhas ended, the output terminal voltage of the fuel cellis set to the OCV value of 400V via the DC/DC converterAs a result, even where the status of the fuel cellchanges from operating to stopped, the value of the current flowing over the power supply linescan be immediately and reliably set to 0 A. The control unitthen obtains the current value Ad from the fuel cell current sensor(step S), and determines the offset correction value Ac needed in order to cancel the drift amount (i.e., in order to perform zero-point correction).