Method for operating a diesel engine, and diesel engine
AssigneeDaimlerChrysler AG
InventorsHolger Adler, Nicholas Fekete, Michael Lenz, Thomas Liebscher, Ulrich Merten, Sven Pfoertsch, Norbert Ruzicka
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Abstract
In a method for operating a diesel engine and a diesel engine, wherein engine emission control is provided by switching between a lean mode with superstoichiometric combustion air ratio λ>1 and a rich mode with substoichiometric combustion air ratio λ<1, the engine-torque fluctuations during the switching are determined and engine parameters which influence the engine torque, are adjusted so as to keep the engine torque constant during the switchover.
Claims15
A method for operating a diesel engine, involving switching between a lean mode of engine operation with superstoichiometric combustion air ratio λ>1 and a rich mode of engine operation with substoichiometric combustion air ratio λ<1, said method comprising the steps of:
- determining engine torque fluctuations during the switching, and
- controlling the engine torque during the switching by adjusting parameters which influence the engine torque so as to keep engine torque constant.
A Diesel engine for carrying out a method for operating a Diesel engine by switching between lean and rich modes of engine operation, said engine including at least one of an engine-speed sensor, an engine-torque sensor, and a throttle device with a first actuator in the intake duct of said engine and an exhaust-gas recirculation device with an exhaust-gas recirculation valve having a second actuator, and an engine management unit, which is coupled to the engine-speed sensor and the engine-torque sensor and the first actuator, and the second actuator, said engine management unit switching between the lean mode and the rich mode of engine operation, to determine engine-torque fluctuations and controlling the engine torque, so as to be constant.
Dependencies are inferred from the claim text.