Cold Start Emission Reduction Monitoring System and Method
First Claim
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1. A method for controlling a vehicle having an engine, the engine having an exhaust with an emission control device, comprising:
- during an engine start, at least temporarily adjusting an operating parameter of the engine to increase exhaust mass flow or temperature when needed to more rapidly heat the emission control device;
estimating temperature of the emission control device during said engine start; and
comparing said estimated temperature to a reference catalyst temperature required to achieve an emission threshold.
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Abstract
An engine emissions diagnostic is disclosed that utilizes parameters correlating to catalyst temperature to identify when an indication of degraded performance may be generated.
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Citations
12 Claims
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1. A method for controlling a vehicle having an engine, the engine having an exhaust with an emission control device, comprising:
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during an engine start, at least temporarily adjusting an operating parameter of the engine to increase exhaust mass flow or temperature when needed to more rapidly heat the emission control device; estimating temperature of the emission control device during said engine start; and comparing said estimated temperature to a reference catalyst temperature required to achieve an emission threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a vehicle having an engine, the engine having an exhaust with an emission control device, comprising:
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during an engine start, at least temporarily adjusting at least engine airflow and spark timing to increase exhaust mass flow and temperature when needed to more rapidly heat the emission control device; overriding at least one of said engine airflow and spark timing adjustments to compensate for an operating condition; and setting a diagnostic indication when said override has caused temperature of the emission control device to be lower than desired to meet an emission level.
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8. A method for controlling a vehicle having an engine, the engine having an exhaust with an emission control device, comprising:
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during an engine cold start, at least temporarily adjusting at least engine airflow and spark timing to increase exhaust mass flow and temperature when needed to more rapidly heat the emission control device; overriding at least one of said engine airflow and spark timing adjustments to compensate for fuel quality effects on combustion; and setting a diagnostic indication when said override has caused temperature of the emission control device to be lower than desired to meet an emission level. - View Dependent Claims (9, 10, 11, 12)
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Specification