METHOD AND APPARATUS FOR ESTIMATING NITROGEN OXIDES OUT OF AN ENGINE

摘要

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.

主权项

1. A system comprising:
a fuel module configured 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 configured to, based on the first value, determine an amount of heat released during a combustion event of the cylinder; a pressure module configured to, based on the amount of heat released, estimate a pressure in the cylinder; a temperature module configured to, based on the pressure, estimate a temperature in the cylinder; a concentration module configured to, based on the pressure or the temperature, estimate nitrogen oxide concentration levels in the cylinder; an output module configured to, based on the nitrogen oxide concentration levels, estimate an amount of nitrogen oxides out of the cylinder; and a control module configured to, based on the amount of nitrogen oxides out of the cylinder, control operation of the engine or an exhaust system of the engine.