Method and apparatus for supplying a reductant to an engine...

Details Method and apparatus for supplying a reductant to an engine... Method and apparatus for supplying a reductant to an engine...

2005-05-31

2005-05-31

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S283000, C060S295000, C060S303000

Reexamination Certificate

active

06898929

ABSTRACT:
A method and apparatus for providing a vaporized reductant to an engine exhaust stream find particular utility in the regeneration of a nitrous oxide absorber in a Diesel engine exhaust treatment system. The method and apparatus are based on fueling the Diesel engine with a mixture of Diesel oil and an alcohol, such as methanol. At least a portion of the alcohol vaporizes in the fuel tank, or is forced to vaporize by passing the fuel mixture through a heat exchanger. The vapor is then stored in a canister for subsequent selective injection of the alcohol into the exhaust stream upstream of the adsorber. The alcohol then thermally decomposes to provide sufficient hydrogen and carbon monoxide to regenerate the adsorber.

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“Regeneration Strategies for NOx Adsorber Catalysts” Owen H. Balley et al., SAE Technical Paper Series 972845; reprinted from “Topics in General and Advanced Emissions” (SP-1296); Oct. 13-16, 1997.
“Study of Factors Influencing the Performance of a NOx Trap in a Light-Duty Diesel Vehicle” Yuejin, et al.; SAE Technical Paper Series 2000-01-2911; Oct. 16-19, 2000.
“High-Efficiency NOx and PM Exhaust Emission Control for Heavy-Duty On-Highway Diesel Engines” Charles Schenck et al., SAE Technical Paper Series 2001-01-1351; Mar. 5-8, 2001.

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