Control for improved vehicle performance
First Claim
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1. A method for controlling an engine coupled to an emission control device susceptible to reversible contamination, the engine capable of operating at a first operating condition and a second operating condition, the method comprising;
- determining an impact of operating the engine at the first operating condition compared to operating the engine at the second operating condition, said impact being a benefit provided by lean operation; and
performing a decontamination cycle in response to at least said impact, wherein said decontamination cycle reduces the reversible contamination, said performing further comprising enabling said decontamination cycle when said benefit is greater than a predetermined value.
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Abstract
An engine control system for managing lean NOx trap decontamination uses associated fuel economy impacts to determine when decontamination is enabled. In particular, a maximum achievable benefit provided by lean operation with a decontaminated NOx trap, a present fuel economy benefit being provided by lean operation, and a fuel economy penalty for performing decontamination are used. When a resulting benefit is greater than a penalty, decontamination is enabled.
115 Citations
5 Claims
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1. A method for controlling an engine coupled to an emission control device susceptible to reversible contamination, the engine capable of operating at a first operating condition and a second operating condition, the method comprising;
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determining an impact of operating the engine at the first operating condition compared to operating the engine at the second operating condition, said impact being a benefit provided by lean operation; and
performing a decontamination cycle in response to at least said impact, wherein said decontamination cycle reduces the reversible contamination, said performing further comprising enabling said decontamination cycle when said benefit is greater than a predetermined value. - View Dependent Claims (2, 3, 4, 5)
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Specification
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Current AssigneeFord Global Technologies, LLC (Ford Motor Company)
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Original AssigneeFord Global Technologies, LLC (Ford Motor Company)
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InventorsSurnilla, Gopichandra, Bidner, David Karl
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Primary Examiner(s)Denion, Thomas
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Assistant Examiner(s)TRAN, DIEM T
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Application NumberUS09/527,714Time in Patent Office977 DaysField of Search602/74, 602/77, 602/85, 602/95US Class Current60/274CPC Class CodesF01N 2570/04 Sulfur or sulfur oxidesF01N 3/0842 Nitrogen oxidesF02D 41/028 Desulfurisation of NOx trap...Y02T 10/12 Improving ICE efficiencies
