Diesel engine and exhaust aftertreatment system and method of treating exhaust gases from a diesel engine
AssigneeMack Trucks, Inc.
InventorChun Tai
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Abstract
In a diesel engine and exhaust aftertreatment system, a controller is arranged to control operation of the engine to obtain a first set of exhaust characteristics and to control a fuel injector to inject fuel upstream of a DPF at a first rate of injection until at least one condition is attained, and, after the at least one condition is attained, to control the fuel injector so that a rate of fuel injection is reduced and to contra! operation of the engine to obtain a second set of exhaust characteristics so that regeneration of the DPF occurs. At least one characteristic of the first and second sets of characteristics beina, different. A method for treating, diesei engine exhaust is also disclosed.
Claims18
A method of treating exhaust gases from a diesel engine, comprising:
- operating the engine and passing exhaust gases through a diesel particulate filter (DPF);
- operating the engine to obtain a first set of exhaust characteristics and injecting fuel upstream of the DPF at a first rate of injection so that active NO2-based regeneration of the DPF occurs until at least one condition is attained;
- and
- after the at least one condition is attained, reducing a rate of fuel injection and operating the engine to obtain a second set of exhaust characteristics so that NO2-based regeneration of the DPF occurs, at least one characteristic of the first and second sets of characteristics being different.
A diesel engine and exhaust aftertreatment system, comprising:
- a diesel engine adapted to be operated to attain at least two different sets of exhaust characteristics;
- a diesel particulate filter (DPF) downstream of the engine;
- a fuel injector downstream of the engine and upstream of the DPF;
- and
- a controller arranged to control operation of the engine to obtain a first set of exhaust characteristics and to control the fuel injector to inject fuel upstream of the DPF at a first rate of injection so that active NO2-based regeneration of the DPF occurs until at least one condition is attained, and, after the at least one condition is attained, to control the fuel injector so that a rate of fuel injection is reduced and to control operation of the engine to obtain a second set of exhaust characteristics so that NO2-based regeneration of the DPF occurs, at least one characteristic of the first and second sets of characteristics being different.
Dependencies are inferred from the claim text.