Engine out NOx virtual sensor using cylinder pressure sensor
AssigneeGM Global Technology Operations LLC
InventorsYue-Yun Wang, Yongsheng He
Life of this patent
Estimating the term…
Abstract
A Method for estimating NOx creation in a combustion process of a four-stroke internal combustion engine includes monitoring engine sensor inputs, modeling parameters descriptive of said combustion process based upon said engine sensor inputs, and estimating NOx creation with an artificial neural network based upon said parameters.
Claims18
Method for estimating NOx creation in a combustion process of a four-stroke internal combustion engine including a variable volume combustion chamber defined by a piston reciprocating within a cylinder between top-dead center and bottom-dead center points, intake and exhaust passages, and intake and exhaust valves controlled during repetitive, sequential exhaust, intake, compression and expansion strokes of said piston, comprising:
- monitoring engine sensor inputs comprising a cylinder pressure within the combustion chamber;
- modeling a mass fraction burn value for combustion within the combustion chamber based upon said engine sensor inputs, wherein said mass fraction burn value indexes a crank angle at which a selected percentage of injected fuel is burned in a combustion cycle;
- estimating a state of combustion within the combustion chamber based upon the mass fraction burn value, the state of combustion comprising a combustion phasing and a combustion strength;
- and
- estimating NOx creation within the combustion chamber with an artificial neural network based upon said state of combustion.
Apparatus for estimating NOx creation in a combustion process of a four-stroke internal combustion engine including a variable volume combustion chamber defined by a piston reciprocating within a cylinder between top-dead center and bottom-dead center points, intake and exhaust passages, and intake and exhaust valves controlled during repetitive, sequential exhaust, intake, compression and expansion strokes of said piston, said apparatus comprising:
- a pressure sensor generating pressure sensor readings describing conditions within said combustion chamber;
- a NOx estimation module including logic operations comprising:
- monitoring said pressure sensor readings;
- modeling a mass fraction burn value for combustion within the combustion chamber based upon said pressure sensor readings, wherein said mass fraction burn value indexes a crank angle at which a selected percentage of injected fuel is burned in a combustion cycle;
- estimating a state of combustion within the combustion chamber based upon the mass fraction burn value, the state of combustion comprising a combustion phasing and a combustion strength;
- and and
- estimating NOx creation with an artificial neural network based upon said state of combustion;
- and
- an aftertreatment system receiving an exhaust gas flow from said engine and modulating aftertreatment based upon said NOx creation estimate.
Dependencies are inferred from the claim text.