The method is particularly useful for treating exhaust gases of diesel engines or of engines using a weak mixture.
The invention relates to a device comprising a catalytic composition made from two and optionally three catalysts used in the treatment of exhaust gases particularly from engines operating with a weak mixture.
This may result in a lean mixture.
The resulting lean mixture (49) is then combusted in the presence of the main mixture (72) that is also lean thereby supporting combustion of the main mixture (72).
If this succeeds, the other cylinders are supplied with a lean mixture.
At least a portion of the aromatic-lean mixture can be recycled to the feed prior to cracking.
The invention concerns a method which consists, during the engine starting phase, in supplying a first group of cylinders with a lean mixture and a second group of cylinders with a rich mixture.
Said main oxidising agent flow (14) is mixed with a main fuel flow (21) in a premixing burner (8) in such a way that a poor mixture is formed, a mixture (23) being fully oxidised in the combustion chamber (7).
In a lean burn mode the engine (10) is run with a lean air/fuel ratio with intermittent purge operations.
The emissions treatment system is advantageously used for the treatment of exhaust streams from lean burn engines including diesel engines and lean burn gasoline engines.
A lean burn internal combustion engine is described having at least one cylinder.
A lean burn region can be created within a flow path of the turbine.
The emissions treatment system is advantageously used for the treatment of exhaust streams from lean burn engines including diesel engines, lean burn gasoline engines and locomotive engines.
spark-ignited lean-burn gas engine
A control unit (18) is provided for switching between the rich fuel use or lean fuel use operational modes.
This results in an emissions-reducing, optimal mixture inside the cylinder during the layered lean operation.
Following the regeneration, the engine is again switched to lean operation.
The ability to operate lean is reduced and the exhaust gas temperature increases as the mixture becomes richer.
These limit values are stored as a lean limit value M¿FK? respectively a rich limit value MF4ST.
According to the invention, the lambda set value is superimposed with a lean/rich amplitude.
The mixture of fuel and air during the first stage combustion is a rich mixture and the mixture of fuel and air and combusted gases during the second stage of combustion is a week mixture .
A poor mix will crumble, segregate, and fall apart.
The exhaust system comprises a lean NOx trap and the catalyzed substrate.
A control unit (18) is provided for switching between operational modes.
A method for controlling operation of an internal combustion engine operating lean of stoichiometry is described.
The invention may be used for diesel engines and lean-mixture spark ignition engines.
The invention also comprises a method for purifying the exhaust gas from lean-burn engines in rich/lean and constant lean mode, in which a catalyst as defined above is used.
These engines are classified either as two-stroke lean-burn, four-stroke lean-burn or four-stroke rich-burn, and are employed with capacities ranging from 10 kilowatts to over 10 megawatts.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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