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:
Jul. 16, 2013
Filed:
Jan. 26, 2009
Hideo Yahagi, Gotemba, JP;
Isamu Nakada, Mishima, JP;
Keiichiro Aoki, Numazu, JP;
Takanori Sasaki, Susono, JP;
Hideo Yahagi, Gotemba, JP;
Isamu Nakada, Mishima, JP;
Keiichiro Aoki, Numazu, JP;
Takanori Sasaki, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
Fuel reforming catalystsgenerate a hydrogen-containing reformed gas when they come into contact with exhaust gas that contains a reforming fuel. Upstream and downstream air-fuel ratio sensorsare respectively installed upstream and downstream of the fuel reforming catalysts. The upstream air-fuel ratio sensoroutputs a upstream sensor signal in accordance with oxygen concentration. The downstream air-fuel ratio sensoroutputs a downstream sensor signal in accordance with oxygen concentration and hydrogen concentration by using zirconia's oxygen detection capability and a change of a diffusion layer's hydrogen-concentration-dependent oxygen detection capability. An ECUdetects the hydrogen concentration without being affected by the oxygen concentration through the use of the upstream sensor signal in which only the oxygen concentration is reflected and the downstream sensor signal in which the oxygen concentration and hydrogen concentration are reflected. This makes it possible to establish a hydrogen concentration detection system with the common air-fuel ratio sensors