Hino Motors, Ltd.

Keiichi Hayashizaki

Shinya Sato

Mitsuru Hosoya

Hiroshi Hirabayashi

Yoshihiro Kawada

Hiroshi Inoue

Satoshi Sato

Incorporated in an exhaust pipe are an HC-SCR NOcatalyst capable of reducing NOat temperatures less than a set temperature T and a catalyzed particulate filter with an oxidation catalyst capable of reducing NOat temperatures not less than the set temperature T. When an exhaust gas temperature is less than the set temperature T, fuel with a set flow rate Q is intermittently added from a fuel addition unit on an entry side of the HC-SCR NOcatalyst to the HC-SCR NOcatalyst; when the exhaust gas temperature is not less than the set temperature T, the fuel with flow rate Q' not less than the set flow rate Q is temporarily rich-spike added from the fuel addition unit and is made arrival at a catalyzed particulate filter. With an active temperature range being expanded, exhaust emission control is performed in a wide temperature range.

Exhaust gas purifier

A carrier gas supplied from a carrier gas source is injected from a carrier gas injection nozzle. Also, a fuel including a hydrocarbon-based liquid and supplied from a fuel source is supplied to a tip end of the carrier gas injection nozzle, whereby this fuel is atomized with the carrier gas injected from the carrier gas injection nozzle. Furthermore, an inlet of a reforming part that decomposes the atomized fuel and reforms the atomized fuel into a reducing gas including either or both of hydrogen and an oxygen-containing hydrocarbon is provided so as to face the carrier gas injection nozzle and the fuel supply nozzle, and a reducing gas supply nozzle that supplies the reducing gas discharged from an outlet of the reforming part is provided in an exhaust pipe.

Fuel reformer and exhaust gas purifier using the same

A first selective reduction catalyst including a silver-based catalyst is provided in an exhaust pipe of an engine. An ozone generation device generates ozone by using oxygen in the atmosphere, and a hydrocarbon-based liquid supply device supplies a hydrocarbon-based liquid. A part of NO in the exhaust gas flowing through the exhaust pipe is oxidized to NOwith the ozone generated by the ozone generation device, and said NOis supplied to the first selective reduction catalyst. Also, a part of the hydrocarbon-based liquid supplied by the hydrocarbon-based liquid supply device is partially oxidized, with ozone generated by the ozone generation device, to an active reducing agent including an oxygen-containing hydrocarbon such as aldehyde, and this active reducing agent is supplied to the first selective reduction catalyst.

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Tokyo, Japan

Keiichi Hayashizaki