Variable displacement engine control system and method
First Claim
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1. A method for an engine, comprising:
- selectively deactivating one or more engine cylinders responsive to operating conditions; and
during reactivation of the cylinders,operating the reactivated cylinders with split fuel injection; and
retarding spark timing in the reactivated cylinders, an amount of spark retard based on an exhaust catalyst temperature.
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Abstract
Methods and systems are provided for improving the performance of a variable displacement engine. Split injection and spark retard may be used in active cylinder during a VDE mode to heat an exhaust catalyst and extend the duration of VDE mode operation. Split injection and spark retard may also be used in reactivated cylinders at a time of cylinder reactivation to improve restart combustion stability.
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Citations
18 Claims
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1. A method for an engine, comprising:
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selectively deactivating one or more engine cylinders responsive to operating conditions; and during reactivation of the cylinders, operating the reactivated cylinders with split fuel injection; and retarding spark timing in the reactivated cylinders, an amount of spark retard based on an exhaust catalyst temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for an engine, comprising:
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selectively deactivating one or more engine cylinders in response to operating conditions; and during reactivation, operating reactivated cylinders with fuel injection split into each of an intake stroke injection and a compression stroke injection for a number of combustion events since the reactivation, a ratio of fuel injected in the intake stroke injection relative to the compression stroke injection based on an exhaust catalyst temperature, an amount of fuel injected in the intake stroke injection increased as the exhaust catalyst temperature falls below a threshold. - View Dependent Claims (14, 15)
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16. A method for an engine, comprising:
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selectively deactivating one or more engine cylinders; during a first reactivation, operating reactivated cylinders with fuel injected as a single injection; and during a second reactivation, operating the reactivated cylinders with fuel split injected into an intake stroke injection and a compression stroke injection. - View Dependent Claims (17, 18)
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Specification