COMPENSATING FOR RANDOM CATALYST BEHAVIOR
First Claim
1. A method for calibrating an engine control module, comprising:
- sampling a first signal from a first oxygen sensor located upstream from a catalyst, wherein the first signal indicates an oxygen content of exhaust gas produced by an engine;
predicting a response of a second oxygen sensor located downstream from the catalyst using a model of the catalyst and the first signal;
sampling a second signal from the second oxygen sensor;
determining a component of the second signal based on a difference between samples of the second signal and the predicted response, wherein the component is due to gases other than oxygen; and
calibrating the engine control module based on the component of the second signal, wherein the engine control module controls an amount of fuel injected into the engine.
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Abstract
A method for calibrating an engine control module includes sampling a first signal from a first oxygen sensor located upstream from a catalyst. The first signal indicates an oxygen content of exhaust gas produced by an engine. The method further includes predicting a response of a second oxygen sensor located downstream from the catalyst using a model of the catalyst and the first signal and sampling a second signal from the second oxygen sensor. The method further includes determining a component of the second signal based on a difference between samples of the second signal and the predicted response. The component is due to gases other than oxygen. Additionally, the method includes calibrating the engine control module based on the component of the second signal. The engine control module controls an amount of fuel injected into the engine.
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Citations
20 Claims
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1. A method for calibrating an engine control module, comprising:
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sampling a first signal from a first oxygen sensor located upstream from a catalyst, wherein the first signal indicates an oxygen content of exhaust gas produced by an engine; predicting a response of a second oxygen sensor located downstream from the catalyst using a model of the catalyst and the first signal; sampling a second signal from the second oxygen sensor; determining a component of the second signal based on a difference between samples of the second signal and the predicted response, wherein the component is due to gases other than oxygen; and calibrating the engine control module based on the component of the second signal, wherein the engine control module controls an amount of fuel injected into the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for calibrating an engine control module, comprising:
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a catalyst simulation module that; samples a first signal from a first oxygen sensor located upstream from a catalyst, wherein the first signal indicates an oxygen content of exhaust gas produced by an engine; and predicts a response of a second oxygen sensor located downstream from the catalyst using a model of the catalyst and the first signal; a component determination module that samples a second signal from the second oxygen sensor and that determines a component of the second signal based on a difference between samples of the second signal and the predicted response, wherein the component is due to gases other than oxygen; and a calibration module that calibrates the engine control module based on the component of the second signal, wherein the engine control module controls an amount of fuel injected into the engine. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification