Multi-Component Transient Fuel Compensation
First Claim
Patent Images
1. A method of adjusting fuel injections to an engine, comprising:
- adjusting an amount of a fuel injection to an engine based on an ethanol content of fuel in a port puddle.
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Abstract
A method adjusts fuel injection to account for fuel puddling in the engine intake. The fuel is adjusted based on the ethanol content of the fuel in the puddle, and the make-up of the various fuel components in the puddle. In this way, it is possible to better account for the effects of these parameters on puddle evaporation.
15 Citations
20 Claims
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1. A method of adjusting fuel injections to an engine, comprising:
adjusting an amount of a fuel injection to an engine based on an ethanol content of fuel in a port puddle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of adjusting fuel injections to an engine, comprising:
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determining an amount of fuel evaporated from a port puddle during an intake stroke; and adjusting an amount of a fuel injection to an engine based on an ethanol content of fuel in the port puddle, a vapor pressure of the fuel in the port puddle, and the amount of fuel evaporated from the port puddle during the intake stroke. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of adjusting fuel injections to an engine for a flex fuel vehicle configured to utilize fuel having two or more components and an ethanol content, the method comprising:
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calibrating a first parameter describing convective evaporation dependence on an air flow as a function of an engine coolant temperature and a percent ethanol of an injected fuel; calibrating a second parameter describing a fraction of injected fuel that hits a port puddle as a function of the engine coolant temperature and the percent ethanol of the injected fuel; determining a ratio of mass fractions of the fuel and air based on a vapor pressure of each of the two or more components of fuel of the port puddle; determining an amount of each of the two or more components of fuel evaporated from the port puddle during an intake stroke based on the first parameter and the ratio of mass fractions of fuel and air; and adjusting an amount of a fuel injection to the engine based on an ethanol content of fuel in the port puddle, the second parameter, and the amount of each of the two or more components of fuel evaporated from the port puddle during the intake stroke.
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Specification