METHOD AND SYSTEM FOR AIR CHARGE ESTIMATION
First Claim
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1. A method for an engine, comprising:
- adjusting an air charge estimate for a first cylinder based on an engine firing pattern, including a firing pattern based on firing of a second cylinder.
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Abstract
Systems and methods are provided. In one example, a method for an engine comprises adjusting an air charge estimate for a first cylinder based on a firing pattern of a second cylinder. In this way, cylinder air charge estimates may be improved in real-time for an arbitrary cylinder firing pattern, thereby improving engine efficiency.
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Citations
20 Claims
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1. A method for an engine, comprising:
adjusting an air charge estimate for a first cylinder based on an engine firing pattern, including a firing pattern based on firing of a second cylinder. - View Dependent Claims (2, 3, 4, 5)
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6. A method for an engine, comprising:
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adjusting an air charge estimate for a first cylinder from an engine sensor by a first amount if an immediately following cylinder in an engine cycle fired in its immediately preceding cycle, and by a second amount if the immediately following cylinder is scheduled not to fire in its immediately succeeding cycle; and adjusting an engine actuator based on the adjusted air charge estimate. - View Dependent Claims (7, 8, 9, 10)
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11. A method for an engine, comprising:
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adjusting an air charge estimate for a first cylinder by a first amount responsive to a second cylinder not firing during a current cycle and a previous cycle; adjusting the air charge estimate by a second amount responsive to the second cylinder firing during the current cycle and not firing during the previous cycle; adjusting the air charge estimate by a third amount responsive to the second cylinder not firing in the current cycle and firing during the previous cycle; and adjusting fuel injection amounts based on the adjusted air charge estimate. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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- 19. The method of cylinder 18, wherein the air charge is estimated based on one or more of a manifold pressure sensor and a mass air flow sensor during engine operation while the engine is driving wheels of a vehicle along a ground.
Specification