Method and apparatus for estimating nitrogen oxides out of an engine
First Claim
1. A system comprising:
- a fuel module programmed to, based on a crankshaft angle of an engine, generate a first value indicative of (i) an amount of fuel burned in a cylinder of the engine, or (ii) a change in the amount of fuel burned in the cylinder;
a heat release module programmed to, based on the first value, determine an amount of heat released during a combustion event of the cylinder;
a pressure module programmed to, based on the amount of heat released, estimate a pressure in the cylinder;
a temperature module programmed to, based on the pressure, estimate a temperature in the cylinder;
a concentration module programmed to, based on the pressure or the temperature, estimate nitrogen oxide concentration levels in the cylinder;
an output module programmed to estimate an amount of nitrogen oxides out of the cylinder based onthe nitrogen oxide concentration levels,a ratio of (i) a concentration level of nitrogen oxide in the cylinder that is not in an equilibrium state, and (ii) a concentration level of nitrogen oxide in the cylinder that is in an equilibrium state, anda plurality of reaction rates; and
a control module programmed to, based on the amount of nitrogen oxides out of the cylinder, control operation of the engine or an exhaust system of the engine.
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Abstract
A system is provided and includes a fuel module that, based on a crankshaft angle of an engine, generates a value indicative of an amount of fuel burned in a cylinder or a change in the amount of fuel burned. A heat release module, based on the value, determines an amount of heat released during a combustion event of the cylinder. A pressure module, based on the amount of heat released, estimates a pressure in the cylinder. A temperature module, based on the pressure, estimates a temperature in the cylinder. A concentration module, based on the pressure or the temperature, estimates nitrogen oxide concentration levels in the cylinder. An output module, based on the nitrogen oxide concentration levels, estimates an amount of nitrogen oxides. A control module, based on the amount of nitrogen oxides out of the cylinder, controls operation of the engine or an exhaust system.
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Citations
18 Claims
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1. A system comprising:
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a fuel module programmed to, based on a crankshaft angle of an engine, generate a first value indicative of (i) an amount of fuel burned in a cylinder of the engine, or (ii) a change in the amount of fuel burned in the cylinder; a heat release module programmed to, based on the first value, determine an amount of heat released during a combustion event of the cylinder; a pressure module programmed to, based on the amount of heat released, estimate a pressure in the cylinder; a temperature module programmed to, based on the pressure, estimate a temperature in the cylinder; a concentration module programmed to, based on the pressure or the temperature, estimate nitrogen oxide concentration levels in the cylinder; an output module programmed to estimate an amount of nitrogen oxides out of the cylinder based on the nitrogen oxide concentration levels, a ratio of (i) a concentration level of nitrogen oxide in the cylinder that is not in an equilibrium state, and (ii) a concentration level of nitrogen oxide in the cylinder that is in an equilibrium state, and a plurality of reaction rates; and a control module programmed to, based on the amount of nitrogen oxides out of the cylinder, control operation of the engine or an exhaust system of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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based on a crankshaft angle of an engine, generating a first value indicative of (i) an amount of fuel burned in a cylinder of the engine, or (ii) a change in the amount of fuel burned in the cylinder; based on the first value, determining an amount of heat released during a combustion event of the cylinder; based on the amount of heat released, estimating a pressure in the cylinder; based on the pressure, estimating a temperature in the cylinder; based on the pressure or the temperature, estimating nitrogen oxide concentration levels in the cylinder; estimating an amount of nitrogen oxides out of the cylinder, based on the nitrogen oxide concentration levels, a ratio of (i) a concentration level of nitrogen oxide in the cylinder that is not in an equilibrium state, and (ii) a concentration level of nitrogen oxide in the cylinder that is in an equilibrium state, and a plurality of reaction rates; and based on the amount of nitrogen oxides out of the cylinder, controlling operation of the engine or an exhaust system of the engine. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification