Gas concentration sensor drift and failure detection system
First Claim
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1. A drift and failure detection system for a gas concentration sensor, comprising:
- a first gas concentration sensor configured to detect a first gas concentration and generate a corresponding first signal;
a second gas concentration sensor configured to detect a second gas concentration and generate a corresponding second signal; and
a controller in communication with the first and second gas concentration sensors, and configured to provide an out-of-tolerance gas concentration sensor warning based on the first and second signals.
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Abstract
A system for detecting when a gas concentration sensor has drifted or failed is disclosed. The system has a first gas concentration sensor configured to detect a first gas concentration and generate a corresponding first signal. The system also has a second gas concentration sensor configured to detect a second gas concentration and generate a corresponding second signal. In addition, the system has a controller in communication with the first and second gas concentration sensors. Based on the first and second signals, the controller is configured to provide an out-of-tolerance gas concentration sensor warning.
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20 Claims
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1. A drift and failure detection system for a gas concentration sensor, comprising:
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a first gas concentration sensor configured to detect a first gas concentration and generate a corresponding first signal; a second gas concentration sensor configured to detect a second gas concentration and generate a corresponding second signal; and a controller in communication with the first and second gas concentration sensors, and configured to provide an out-of-tolerance gas concentration sensor warning based on the first and second signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of detecting when a gas concentration sensor has drifted or failed, comprising:
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detecting a first gas concentration with a first gas concentration sensor; detecting a second gas concentration with a second gas concentration sensor; calculating a difference between the detected first and second gas concentrations; and providing an out-of-tolerance gas concentration sensor warning based on the calculated difference between the detected first and second gas concentrations. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A combustion engine, comprising:
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an air/fuel supply system; a combustion chamber located downstream of the air/fuel supply system; an exhaust system located downstream of the combustion chamber, the exhaust system including; a first gas concentration sensor configured to detect a first gas concentration and generate a corresponding first signal; and a second gas concentration sensor configured to detect a second gas concentration and generate a corresponding second signal; and an engine control module in communication with the first and second gas concentration sensors, and the air/fuel supply system, and configured to; provide an out-of-tolerance gas concentration sensor warning based on the first and second signals; and adjust an air/fuel ratio based on at least one of the first and second signals. - View Dependent Claims (17, 18, 19, 20)
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Specification