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:
Oct. 03, 2006
Filed:
Sep. 11, 2003
Hitoshi Sato, Fujisawa, JP;
Naofumi Ochi, Fujisawa, JP;
Masashi Gabe, Fujisawa, JP;
Takehito Imai, Fujisawa, JP;
Hitoshi Sato, Fujisawa, JP;
Naofumi Ochi, Fujisawa, JP;
Masashi Gabe, Fujisawa, JP;
Takehito Imai, Fujisawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
To provide an exhaust gas purifying method for purifying the exhaust gas of an internal combustion engine () by an exhaust gas purifying system () having an oxidation catalyst (), which comprises the steps of estimating the quantity of unburnt hydrocarbon accumulated in a support of the oxidation catalyst (), performing a hydrocarbon removal control when an estimated accumulation quantity (Vhc) of the unburnt hydrocarbon exceeds a predetermined judgment value (Vhc) and raising an exhaust gas temperature (T) to activate the oxidation catalyst () and oxidizing and removing the accumulated unburnt hydrocarbon. Thereby, it is possible to prevent a white fume from being produced after a low exhaust temperature state of an idling operation or the like continues for a long time.