Catalyst monitor with direct prediction of hydrocarbon conversion efficiency by dynamic neural networks
First Claim
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1. A process for monitoring catalytic converter activity comprising:
- training a first neural network to predict feedgas emissions from a plurality of signals derived from an electronic engine control module by sensing emission constituents under dynamic conditions;
training a second neural network to predict tailpipe emissions from a plurality of signals derived from an electronic engine control module by sensing emission constituents under dynamic conditions;
predicting feedgas emissions at said first trained neural network by inputting a first set of a plurality of engine operating condition signals to said first neural network;
predicting tailpipe emissions at said second trained neural network by inputting a second set of said plurality of engine operating condition signals to said second neural network;
predicting catalyst conversion activity by determining the ratio of feedgas emission predictions to tailpipe emission predictions; and
indicating when said predicted catalytic converter activity is below a predetermined level.
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Abstract
A process and apparatus for monitoring catalyst conversion activity includes a predictor of feedgas emissions and a predictor of tailpipe emissions, each predictor providing an output for generating a ratio of conversion activity. Each predictor comprises a trained neural network receiving at least one of, and preferably a plurality of, the engine operating condition signals available from an electronic engine control. Preferably, each neural network is trained by inputting accumulated data acquired from performance evaluation of a plurality of vehicles having consistent powertrains but with different degrees of deterioration.
48 Citations
15 Claims
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1. A process for monitoring catalytic converter activity comprising:
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training a first neural network to predict feedgas emissions from a plurality of signals derived from an electronic engine control module by sensing emission constituents under dynamic conditions; training a second neural network to predict tailpipe emissions from a plurality of signals derived from an electronic engine control module by sensing emission constituents under dynamic conditions; predicting feedgas emissions at said first trained neural network by inputting a first set of a plurality of engine operating condition signals to said first neural network; predicting tailpipe emissions at said second trained neural network by inputting a second set of said plurality of engine operating condition signals to said second neural network; predicting catalyst conversion activity by determining the ratio of feedgas emission predictions to tailpipe emission predictions; and indicating when said predicted catalytic converter activity is below a predetermined level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A monitor for monitoring compliance with hydrocarbon conversion activity levels of an internal combustion engine having an electronic engine control with a plurality of engine operating condition signals, comprising:
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a first plurality of said engine operating condition signals; a second plurality of said engine operating condition signals; a first trained neural network predictor generating a feedgas emission constituent prediction signal in sensed response to said first plurality of engine operating condition signals; a second trained neural network predictor generating a tailpipe emission constituent prediction signal in sensed response to said second plurality of engine operating condition signals; a comparator for determining compliance of a ratio of said feedgas emission prediction to said tailpipe emission prediction with a predetermined ratio standard for said predictions; and an indicator for advising of a failure to detect compliance in response to said ratio comparator. - View Dependent Claims (12)
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13. A process for monitoring catalytic converter activity comprising:
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inputting a plurality of engine operating condition signals; predicting a first level of emissions at a feedgas pipe entering the converter in response to inputting a first set of said plurality of engine operating condition signals through a dynamically trained neural network; predicting a second level of emissions at a tailpipe exiting the converter in response to inputting a second set of said plurality of engine operating condition signals through a dynamically trained neural network; comparing the predicted first and second levels of emission predictions to determine a ratio of the tailpipe emission prediction to the feedgas pipe emission prediction; and indicating the activity of said catalyst by signaling in response to a determined ratio of predictions greater than a predetermined ratio. - View Dependent Claims (14, 15)
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Specification