Method for improved vehicle performance
First Claim
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1. A method for determining a penalty of a decontamination cycle, the decontamination cycle for an emission control device coupled to an internal combustion engine, the method comprising:
- calculating an excess quantity of fuel used during any decontamination cycle that removes sulfur compounds that are contaminating the emission control device; and
generating the penalty based on said excess quantity of fuel, wherein said generating further comprises generating the penalty based on said excess quantity of fuel and a distance traveled between decontamination cycles.
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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.
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Citations
7 Claims
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1. A method for determining a penalty of a decontamination cycle, the decontamination cycle for an emission control device coupled to an internal combustion engine, the method comprising:
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calculating an excess quantity of fuel used during any decontamination cycle that removes sulfur compounds that are contaminating the emission control device; and
generating the penalty based on said excess quantity of fuel, wherein said generating further comprises generating the penalty based on said excess quantity of fuel and a distance traveled between decontamination cycles. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification