SYSTEM AND METHOD FOR CONTROLLING AN ENGINE DURING TRANSIENT EVENTS
First Claim
1. A method for controlling an internal combustion engine, the method comprising:
- adjusting fuel delivered to at least one cylinder during a transient event by an amount indexed by number of combustion events occurring after start of the transient event to provide a desired air/fuel ratio in the at least one cylinder during the transient event.
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Accused Products
Abstract
Systems and methods for controlling an internal combustion engine include adjusting fuel delivered to a cylinder during a transient event by an amount indexed by number of combustion events after detecting the transient event. A base fueling parameter may be adjusted by an adaptive correction value indexed by combustion events after the transient event is detected, with the adaptive value determined using air/fuel ratio difference of previous combustion events during similar transient operating conditions associated with the same combustion event index number. Ionization sensor signal characteristics may be used to determine actual air/fuel ratios used to determine the air/fuel ratio difference and corresponding adaptive correction values. The adaptive values may be modified in response to a vehicle refueling event based on an amount of added fuel relative to existing fuel in the vehicle fuel tank.
27 Citations
27 Claims
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1. A method for controlling an internal combustion engine, the method comprising:
adjusting fuel delivered to at least one cylinder during a transient event by an amount indexed by number of combustion events occurring after start of the transient event to provide a desired air/fuel ratio in the at least one cylinder during the transient event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for controlling an internal combustion engine, the method comprising:
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detecting a transient event; processing at least one characteristic of an ionization signal associated with a combustion event; determining an air/fuel ratio associated with the combustion event using the at least one characteristic of the ionization signal; storing a fueling correction value indexed by a combustion event number corresponding to number of combustion events after detecting the transient event, the fueling correction value determined in response to a scheduled fueling value and a difference between the air/fuel ratio associated with the combustion event and a desired air/fuel ratio; and adjusting fuel delivered to at least one cylinder using a previously stored fueling correction value associated with a current combustion event number. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A system for controlling an internal combustion engine, the system comprising:
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a first sensor for detecting a transient event; a second sensor for determining an air/fuel ratio associated with a combustion event occurring after start of the transient event; a fuel injector for delivering fuel to at least one cylinder of the engine; a controller in communication with the first and second sensors and the fuel injector, the controller adjusting fuel delivered by the fuel injector to at least one cylinder during the transient event by an amount indexed by number of combustion events occurring after start of the transient event to provide a desired air/fuel ratio in the at least one cylinder during the transient event. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A computer readable storage medium having data stored therein representing instructions executable by a microprocessor to control an internal combustion engine during a transient event, the computer readable storage medium comprising:
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instructions that detect the transient event;
instructions that process at least one characteristic of an ionization signal associated with a combustion event;instructions that determine an air/fuel ratio associated with the combustion event using the at least one characteristic of the ionization signal; instructions that store a fueling correction value indexed by a combustion event number corresponding to number of combustion events after detecting the transient event, the fueling correction value determined in response to a scheduled fueling value and a difference between the air/fuel ratio associated with the combustion event and a desired air/fuel ratio; and instructions that adjust fuel delivered to at least one cylinder using a previously stored fueling correction value associated with a current combustion event number. - View Dependent Claims (27)
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Specification