Method and apparatus for determining temperature in a gas feedstream
AssigneeGM Global Technology Operations LLC
InventorsQi Ma, Julian R. Verdejo, Nicholas John Kalweit
Life of this patent
Estimating the term…
Abstract
An internal combustion engine includes an exhaust gas feedstream flowing past a gas sensing device disposed therein. The gas sensor includes an integrated electrical heating element which provides a resistance indicative of its temperature. An unknown input observer is used to determine the exhaust gas feedstream temperature based on the heating element temperature.
Claims12
Article of manufacture in combination with a sensing device having an integrated heating element, the article of manufacture comprising a storage medium having a machine-executable computer program encoded therein to monitor a gas feedstream utilizing the sensing device having the integrated heating element, the combination comprising:
- the sensing device;
- the integrated heating element;
- and
- the machine-executable computer program, wherein the machine-executable computer program comprises:
- a first code to monitor electrical resistance of the integrated heating element;
- a second code to determine a temperature of the integrated heating element based upon the electrical resistance;
- a third code to determine a gas temperature within a shield of the sensing device based upon the temperature of the integrated heating element, said third code comprising an unknown input observer model configured to estimate the gas temperature within the shield of the sensing device based upon the temperature of the integrated heating element;
- and
- a fourth code to determine a temperature of the gas feedstream based upon the gas temperature within the shield of the sensing device.
Article of manufacture in combination with a sensing device having an integrated heating element, the article of manufacture comprising a storage medium having a machine-executable computer program encoded therein to monitor an exhaust gas feedstream within an exhaust aftertreatment system, the combination comprising:
- a sensing device;
- an integrated heating element;
- and
- the machine-executable computer program, wherein the machine-executable computer program comprises:
- a first code to monitor electrical resistance of the integrated heating element of the sensing device configured to monitor the exhaust gas feedstream;
- a second code to determine a temperature of the integrated heating element based upon the electrical resistance;
- a third code comprising an executable unknown input observer model configured to estimate a gas temperature within a shield of the sensing device based upon the temperature of the integrated heating element;
- and
- a fourth code to determine a temperature of the exhaust gas feedstream based upon the estimated gas temperature within the shield of the sensing device.
Dependencies are inferred from the claim text.