Method and system for selective cylinder deactivation
First Claim
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1. A method for an engine, comprising:
- adjusting an air charge estimate for a cylinder on a current engine cycle based on an induction history of the cylinder, including an induction state of the cylinder on an immediately previous engine cycle; and
injecting fuel to the cylinder in response to the adjusted air charge estimate.
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Abstract
Systems and methods are provided for increasing the accuracy of air charge estimation for a cylinder that is selectively deactivatable. A controller may deactivate the cylinder in accordance with a firing pattern selected based on torque demand. An air charge estimate of the firing cylinder is then adjusted based on whether the cylinder was fired or skipped on a previous engine cycle when operating according to the selected firing pattern.
16 Citations
20 Claims
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1. A method for an engine, comprising:
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adjusting an air charge estimate for a cylinder on a current engine cycle based on an induction history of the cylinder, including an induction state of the cylinder on an immediately previous engine cycle; and injecting fuel to the cylinder in response to the adjusted air charge estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for an engine, comprising:
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adjusting an aircharge estimate for a cylinder by a first amount via a first aircharge calibration responsive to the cylinder firing during a current engine cycle and an immediately previous engine cycle; and adjusting the aircharge estimate by a second amount via a second aircharge calibration responsive to the cylinder firing during the current engine cycle and not firing during at least the immediately previous engine cycle. - View Dependent Claims (13, 14, 15, 16)
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17. A method for an engine, comprising:
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estimating an amount of air entering a cylinder responsive to one of two air charge characterizations for the cylinder and a last previous induction state of the cylinder; and injecting fuel to the cylinder in response to the amount of air entering the cylinder. - View Dependent Claims (18, 19, 20)
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Specification