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:
Sep. 24, 2013
Filed:
May. 08, 2009
Kotaro Ikeda, Susono, JP;
Toshiaki Kusakari, Susono, JP;
Hideaki Kume, Gotemba, JP;
Yoshihiro Ikogi, Mishima, JP;
Noriyuki Kobayashi, Susono, JP;
Hikaru Hasegawa, Susono, JP;
Kotaro Ikeda, Susono, JP;
Toshiaki Kusakari, Susono, JP;
Hideaki Kume, Gotemba, JP;
Yoshihiro Ikogi, Mishima, JP;
Noriyuki Kobayashi, Susono, JP;
Hikaru Hasegawa, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A fuel cell system includes a fuel cell, an impedance measuring instrument, and a control device. The control device is connected to the impedance measuring instrument. The impedance measuring instrument measures the impedance of the fuel cell according to the AC impedance method. The control device stores in advance a reference value corresponding to a reference hydrogen concentration. The control device compares the real part Z' of impedance acquired via the impedance measuring instrument against the reference value. When Z′ is equal to or greater than the reference value, the control device estimates the hydrogen concentration of the fuel cell to be equal to or less than the reference hydrogen concentration.