Method and Apparatus For Measuring and Correcting an In-Cylinder Pressure Measurement
First Claim
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1. A method of obtaining a corrected engine operational parameter value comprising;
- obtaining a measurement of an operational parameter value from said engine using a sensor,independently estimating said operational parameter value measurement,comparing said estimate with said measurement and updating the estimate based on said comparison, andproviding a corrected engine operational parameter value based on said updated estimate.
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Abstract
A method and apparatus for obtaining a corrected engine operational parameter value, using cylinder pressure information. A real pressure sensor signal output from a sensor (41D) is compared for discrepancies with an estimated output from engine pressure model (42A), including an engine model and a sensor model. The engine pressure model is corrected dependent on the discrepancy and the model engine pressure is then taken as the output value.
54 Citations
27 Claims
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1. A method of obtaining a corrected engine operational parameter value comprising;
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obtaining a measurement of an operational parameter value from said engine using a sensor, independently estimating said operational parameter value measurement, comparing said estimate with said measurement and updating the estimate based on said comparison, and providing a corrected engine operational parameter value based on said updated estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for obtaining a corrected engine operational parameter value comprising a data store and a comparator, wherein;
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the data store contains an engine operational parameter value estimator, the comparator is arranged to compare sensor information indicative of engine operational parameter value and the estimated engine operational parameter value from the data store, the data store is arranged to update said estimator based on the result of said comparison and provide a corrected engine operational parameter value based on said engine operational parameter value. - View Dependent Claims (11, 12, 13, 14, 15, 23)
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16. A method of obtaining an engine operational parameter value comprising;
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obtaining a sensor measurement of said operational parameter value from an engine, passing said measurement as an input to an inverted model of said sensor, passing a modelled engine condition value to said inverted sensor model from a model of said engine, and reconstructing said engine operational parameter value as an output from said inverted sensor model. - View Dependent Claims (17, 18, 19)
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20. An apparatus for obtaining an engine operational parameter value comprising a data store, wherein;
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the data store contains an inverted model of said sensor means and a model of said engine, the inverted sensor model is arranged to receive as an input from a sensor a measurement of the engine operational parameter value, the engine model is arranged to input modelled engine parameter value to said inverted sensor model and said inverted sensor model is arranged to reconstruct said engine operational parameter value as an output. - View Dependent Claims (21, 22)
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24. (canceled)
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25. (canceled)
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26. (canceled)
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27. (canceled)
Specification