Computer device to calculate emission control device functionality
First Claim
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1. A method for evaluating performance of an emission control device coupled in an exhaust system of a vehicle driven on the road, the method comprising:
- determining a first factor based on a duration during which the emission control device is exposed to a lean air-fuel ratio above a limit value, said limit value determined as a function of temperature in the exhaust system;
determining a second factor based on an amount of sulfur contamination of said emission control device; and
determining a performance value for said emission control device based on said first and second factors.
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Abstract
A system is described for improving engine and vehicle performance by considering the effects of exhaust conditions on catalyst particle growth. Specifically, engine operation is adjusted to reduce operating in such conditions, and a diagnostic routine is described for determining the effects of any operation that can cause such particle growth. Further, routines are described for controlling various vehicle conditions, such as deceleration fuel shut-off, to reduce effects of the particle growth on emission performance.
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Citations
25 Claims
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1. A method for evaluating performance of an emission control device coupled in an exhaust system of a vehicle driven on the road, the method comprising:
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determining a first factor based on a duration during which the emission control device is exposed to a lean air-fuel ratio above a limit value, said limit value determined as a function of temperature in the exhaust system; determining a second factor based on an amount of sulfur contamination of said emission control device; and determining a performance value for said emission control device based on said first and second factors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for evaluating performance of an emission control device coupled in an exhaust system of a vehicle driven on the road, the method comprising:
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determining a first factor based on a duration during which the emission control device is exposed to an exhaust gas mixture with an oxygen partial pressure above a limit value, said limit value determined as a function of temperature in the exhaust system; determining a second factor based on an amount of sulfur contamination of said emission control device; and determining a performance value for said emission control device based on said first and second factors. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An article of manufacture have a computer readable storage medium with computer readable code for evaluating performance of an emission control device coupled in an exhaust system of a vehicle driven on the road, the medium comprising:
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code for determining a first factor based on a duration of time during which the emission control device is exposed to a lean air-fuel ratio above a limit value, said limit value determined as a function of temperature of exhaust gasses in the emission control device; code for determining a second factor based on an amount of sulfur contamination of said emission control device, said second factor based on an estimated amount of sulfur contamination determined from engine operating conditions; and code for determining a performance value for said emission control device based on said first and second factors, said performance value indicative of capacity of said emission control device to retain NOx during oxygen deficient exhaust gas conditions. - View Dependent Claims (25)
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Specification