Simplified method for measuring concentration of various exhaust gas mixture components utilizing dissimilar sensors
AssigneeEngine Control and Monitoring
InventorsRonald S. Patrick, Robert Lupul
Life of this patent
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Abstract
A simplified method for measuring a first property and a second property of an exhaust gas mixture utilizing sensors manufactured for the purpose of measuring a first property, but having a cross-sensitivity to a second property of the exhaust gas mixture. Sensor response characteristics to the first property and the second property are accounted for and used in conjunction with a direct differential measurement between sensors to quantify the concentrations of a first and a second property.
Claims6
A method for simultaneously measuring a plurality of properties associated with an exhaust gas mixture, said method comprising:
- combining a plurality of sensors wherein each sensor among said plurality of sensors exhibits known sensitivities to a first property and exhibits known, but measurably different, cross-sensitivities to a second property in an exhaust gas mixture;
- wherein said plurality of sensors provide differential signals indicative of an amount of said first property and said second property in said exhaust gas mixture;
- directly reading, between two of said sensors, a differential value.
A method for simultaneously measuring both the NOx and NH3 quantities in an exhaust gas mixture comprising;
- a first NOx sensor exhibiting a first known cross-sensitivity to NH3;
- a second NOx sensor with a second known cross-sensitivity to NH3;
- said first known cross-sensitivity being measurably different from said second known cross-sensitivity;
- directly measuring a differential between said first NOx sensor and said second NOx sensor a difference indicative of the quantities of NOx and NH3 in said exhaust gas mixture.
Dependencies are inferred from the claim text.