Method and system for determining a quantity of fuel to be injected into an internal combustion engine
First Claim
1. A method for determining a quantity of fuel to be injected into a multicylinder internal combustion engine during each combustion event of the engine, the method comprising:
- sensing a quantity of air flowing through the engine;
determining a desired combustion fuel quantity based on the quantity of air flowing through the engine, the desired combustion fuel quantity representative of a desired mass of vapor to be injected into the engine;
determining a desired fuel injection quantity based on a previous fuel injection quantity delivered during a previous combustion event and the desired combustion fuel quantity, including parsing the previous fuel injection quantity into a plurality of liquid components, each liquid component having a known boiling point range, and assigning a vaporization constant to each of the components; and
controlling the amount of fuel injected into the engine for the current combustion event based on the desired fuel injection quantity.
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Accused Products
Abstract
A method and system for determining a quantity of fuel to be injected into a multi-cylinder, internal combustion engine during each combustion event of the engine includes an air flow sensor for sensing a quantity of air flowing through the engine. An electronic control unit is operative to determine a desired combustion fuel quantity based on the quantity of air flowing through the engine and determine a desired fuel injection quantity based on a previous fuel injection quantity delivered during a previous combustion event and the desired combustion fuel quantity. The control unit is further operative to control the amount of fuel injected into the engine for the current combustion event based on the desired fuel injection quantity.
25 Citations
20 Claims
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1. A method for determining a quantity of fuel to be injected into a multicylinder internal combustion engine during each combustion event of the engine, the method comprising:
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sensing a quantity of air flowing through the engine; determining a desired combustion fuel quantity based on the quantity of air flowing through the engine, the desired combustion fuel quantity representative of a desired mass of vapor to be injected into the engine; determining a desired fuel injection quantity based on a previous fuel injection quantity delivered during a previous combustion event and the desired combustion fuel quantity, including parsing the previous fuel injection quantity into a plurality of liquid components, each liquid component having a known boiling point range, and assigning a vaporization constant to each of the components; and controlling the amount of fuel injected into the engine for the current combustion event based on the desired fuel injection quantity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining a quantity of fuel to be injected into a multicylinder internal combustion engine during each combustion event of the engine, the system comprising:
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an air flow sensor for sensing a quantity of air flowing through the engine; and an electronic control unit operative to determine a desired combustion fuel quantity based on the quantity of air flowing through the engine wherein the desired combustion fuel quantity is representative of a desired mass of vapor to be injected into the engine, determine a desired fuel injection quantity based on a previous fuel injection quantity delivered during a previous combustion event and the desired combustion fuel quantity, and control the amount of fuel injected into the engine for the current combustion event based on the desired fuel injection quantity, wherein the electronic control unit, in determining the desired fuel injection quantity, is further operative to parse the previous fuel injection quantity into a plurality of liquid components, each liquid component having a known boiling point range, and assign a vaporization constant to each of the components. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for determining a quantity of fuel to be injected into an internal combustion engine during each combustion event of the engine comprising:
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numerically simulating parsing of past injected fuel into different liquid components based on mass fractions of different hydrocarbon components used in a test fuel; predicting vaporization rates for the different liquid components, wherein the vaporization rates for the different liquid components are modeled as a function of a temperature state of the engine; summing the total vapor from the different liquid components, and comparing the total predicted vapor quantity to a desired combustion fuel quantity; and correcting the fuel quantity to be injected based on the comparison. - View Dependent Claims (20)
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Specification