Systems and methods for engine control
First Claim
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1. A method, comprising:
- during engine operation with a commanded amount of exhaust gas recirculation (EGR), responsive to at least one of an integrated knock intensity of an engine being greater than a threshold intensity and a fuel control correction of fuel supplied to the engine being greater than a threshold enrichment, setting an EGR rate to zero.
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Abstract
Methods and systems are provided for adjusting spark timing and fueling in an engine in response to an indication of exhaust gas recirculation (EGR) system degradation due to a disconnected upstream hose of an EGR differential pressure sensor. In one example, a method may include, responsive to an integrated knock intensity being greater than a threshold intensity and a fuel control correction being greater than a threshold enrichment, setting an EGR rate to zero and triggering an EGR differential pressure sensor upstream hose diagnostic routine to be performed. Further, spark timing and fueling may be set for zero EGR.
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9 Claims
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1. A method, comprising:
during engine operation with a commanded amount of exhaust gas recirculation (EGR), responsive to at least one of an integrated knock intensity of an engine being greater than a threshold intensity and a fuel control correction of fuel supplied to the engine being greater than a threshold enrichment, setting an EGR rate to zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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