Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-01-04
1999-12-14
Denion, Thomas E.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60297, 60289, 60285, 60307, F01N 300
Patent
active
060002174
ABSTRACT:
An exhaust gas treatment method for an exhaust system that includes a hydrocarbon trap (16) disposed upstream of a downstream catalyst zone comprising a catalyst effective at least for the oxidation of unburned hydrocarbons, in which air is added to the exhaust gas stream in an amount that provides a stoichiometric air/fuel balance in the exhaust gas entering the downstream catalyst zone. The air may be added at any point upstream of the downstream catalyst zone, but optimum results are obtained when air is added between the trap (16) and the downstream catalyst zone. The addition of air can be controlled by the output of a sensor (26) that measures the air/fuel ratio of the exhaust gas, disposed downstream of the trap (16), or by the output of a thermocouple (18) disposed upstream of the trap.
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Denion Thomas E.
Engelhard Corporation
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