System and method to control cylinder activation and deactivation
First Claim
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1. A method for controlling an engine of a powertrain in a vehicle on the road, the method comprising:
- deactivating fuel injection to at least one engine cylinder based at least on a vehicle operating condition;
determining a duration required for reactivating at least said at least one engine cylinder;
determining a minimum engine speed value based on an operating parameter; and
reactivating at least said at least one engine cylinder based at least on said duration, wherein said reactivating is further based on a comparison of said minimum engine speed with a predicted future engine speed based on said duration.
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Abstract
Engine cylinder reactivation from a fuel-cut state is controlled based on a calculated future engine speed and a minimum allowable engine speed. The future engine speed is calculated based on the current rate of change of engine speed and a duration required to reactivate an engine cylinder. The duration can be in the time domain, or engine event domain, for example.
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Citations
19 Claims
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1. A method for controlling an engine of a powertrain in a vehicle on the road, the method comprising:
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deactivating fuel injection to at least one engine cylinder based at least on a vehicle operating condition; determining a duration required for reactivating at least said at least one engine cylinder; determining a minimum engine speed value based on an operating parameter; and reactivating at least said at least one engine cylinder based at least on said duration, wherein said reactivating is further based on a comparison of said minimum engine speed with a predicted future engine speed based on said duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for controlling an engine of a powertrain in a vehicle on the road, the method comprising;
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deactivating fuel injection to at least one engine cylinder based at least on a vehicle operating condition; determining a duration required for reactivating at least said at least one engine cylinder; determining a minimum engine speed value based on an operating parameter; calculating an engine speed after said duration based on a rate of change of engine speed; and reactivating at least said at least one engine cylinder based at least on a comparison of said calculated engine speed and said determined minimum engine speed. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A computer storage medium having instructions encoded therein for controlling an engine of a powerirain in a vehicle on the road, said medium comprising:
code for deactivating fuel injection to at least one engine cylinder based at least on a vehicle operating condition; code for determining a duration required for reactivating at least said at least one engine cylinder; code for determining a rate of change of engine speed; and code for reactivating at least said at least one engine cylinder based at least on said rate of change of engine speed and said duration. - View Dependent Claims (19)
Specification