Engine emissions analyzer with diagnostic
First Claim
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1. A vehicle emissions estimating method for indicating emissions of an automotive vehicle having a plurality of emissions control systems, comprising the steps of:
- storing a model representing a relationship between emissions control system fault conditions and corresponding variation in vehicle emissions away from a base level of vehicle emissions;
diagnosing an emissions control system fault condition;
referencing the vehicle emissions variation corresponding to the diagnosed emissions control system fault condition from the stored model;
periodically during a test period, determining an occurrence of any of a predetermined set of engine events;
estimating a level of vehicle emissions as a predetermined function of the determined occurrences;
applying the referenced vehicle emissions variation to the estimated level of vehicle emissions to form a corrected vehicle emissions estimate; and
indicating the corrected vehicle emissions estimate.
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Abstract
A method for analyzing automotive vehicle emissions detects and logs significant engine events over a test period, and applies the logged events to a model defining the emissions impact of such events to yield a vehicle emissions estimate for the test period. The method includes a diagnostic for diagnosing a deviation in performance of emissions control systems away from an expected performance and for correcting the vehicle emissions estimated to reflect the operating condition of the emissions control systems.
35 Citations
13 Claims
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1. A vehicle emissions estimating method for indicating emissions of an automotive vehicle having a plurality of emissions control systems, comprising the steps of:
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storing a model representing a relationship between emissions control system fault conditions and corresponding variation in vehicle emissions away from a base level of vehicle emissions; diagnosing an emissions control system fault condition; referencing the vehicle emissions variation corresponding to the diagnosed emissions control system fault condition from the stored model; periodically during a test period, determining an occurrence of any of a predetermined set of engine events; estimating a level of vehicle emissions as a predetermined function of the determined occurrences; applying the referenced vehicle emissions variation to the estimated level of vehicle emissions to form a corrected vehicle emissions estimate; and indicating the corrected vehicle emissions estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for indicating an estimate of the emissions of an automotive vehicle having a plurality of emissions control systems, comprising the steps of:
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storing an emissions model representing vehicle emissions as a function of a predetermined set of vehicle operating parameter values; storing a schedule of model correction values as a function of a series of emissions control system fault conditions; logging values of the predetermined set of vehicle operating parameters over a test period; generating a base vehicle emissions estimate by applying the logged values to the stored emissions model; diagnosing emissions control system fault conditions over the test period; applying a diagnosed emissions control system fault condition to the stored schedule to reference a model correction value; correcting the base vehicle emissions estimate by applying the referenced model correction value to the base vehicle emissions estimate; and indicating the corrected base vehicle emissions estimate. - View Dependent Claims (11, 12, 13)
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Specification