Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1993-11-01
1995-08-08
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
123326, 123682, F02D 4114
Patent
active
054388260
ABSTRACT:
The invention is directed to a method for reducing the exhaust-gas emissions of an internal combustion engine which is equipped with a lambda control and a catalytic converter and for which the metering of fuel can be interrupted in dependence upon operating parameters. The method is characterized in that the engine at first is operated with a rich fuel/air mixture during transition from operation without fuel metering to operation with fuel metering. The oxygen deficiency associated therewith compensates the oxygen excess which is stored in the catalytic converter when the metering of fuel is interrupted. An operating state wherein oxygen is loaded therefore occurs quickly after a fuel cutoff. This operating state also defines an optimum at steady state and this is advantageous especially for the conversion of nitrogen oxide.
REFERENCES:
patent: 4452212 (1984-06-01), Takase
patent: 5020495 (1991-06-01), Plapp
patent: 5022225 (1991-06-01), Sawada et al.
patent: 5228286 (1993-07-01), Demura
Patent Abstracts of Japan, vol. 13, No. 223 (M-829) 24 May 1989, abstract of JP-A-10036943.
Blischke Frank
Hirschmann Klaus
Raff Lothar
Schnaibel Eberhard
Argenbright Tony M.
Ottesen Walter
Robert & Bosch GmbH
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