Exhaust gas purification apparatus for engine

Details Exhaust gas purification apparatus for engine Exhaust gas purification apparatus for engine

2006-06-13

2006-06-13

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S284000, C060S285000, C060S300000, C060S311000

Reexamination Certificate

active

07059122

ABSTRACT:
The exhaust gas purification apparatus for an engine comprises, a catalytic converter provided in an exhaust path of the engine and including a carrier, an HC absorbent, an HC purifying catalyst, and a transition metal, and a control apparatus for controlling operation of the engine, the control apparatus including an HC desorption timing estimation section for estimating a timing at which the HC is desorbed from the HC absorbent and a control section for controlling an air fuel ratio upon starting of the engine to a ratio richer than a stoichiometric air fuel ratio to start operation of the engine and changing over the air fuel ratio to a ratio leaner than the stoichiometric air fuel ratio at the timing at which the HC is desorbed based on an output of the HC desorption timing estimation section.

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Lafyatis, David S., et al. Society of Automative Engineers Technical Paper Document No. 980421. International Congress & Exposition, Feb. 1998, Detroit, MI, USA, Session: Advanced Converter Concepts For Emission Control, pp. 65-70.

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