Method and system for controlling fuel delivery during engine cranking
First Claim
1. A method for determining an amount of fuel to be delivered to an individual cylinder of an internal combustion engine during engine cranking, the individual cylinder having an intake port for regulating entry of the fuel into the cylinder and having a prior puddle mass estimate corresponding to a mass of fuel previously remaining in the intake port before key-off of the engine, the method comprising:
- sensing a plurality of engine parameters;
determining a temperature of the engine stored at key-off;
determining a new puddle mass estimate for the cylinder based on the temperature of the engine stored at key-off and the prior puddle mass estimate; and
determining a desired fuel mass to be injected into the cylinder based on the new puddle mass estimate and the plurality of engine parameters.
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Accused Products
Abstract
A method and system for controlling fuel delivery to an individual cylinder of an internal combustion engine during engine cranking compensates for fuel transport dynamics and the actual fuel injected into the cylinder. A plurality of engine parameters are sensed, including engine temperature, inducted air mass per cylinder and number of engine intake events since cranking. A temperature of the engine stored at key-off is determined. A new puddle mass estimate for the cylinder is determined based on the decay ratio of the new puddle mass estimate to the prior puddle mass estimate stored before key-off utilizing the temperature of the engine stored at key-off. A desired fuel mass to be injected into the cylinder is then determined based on the new puddle mass estimate and the plurality of engine parameters.
21 Citations
17 Claims
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1. A method for determining an amount of fuel to be delivered to an individual cylinder of an internal combustion engine during engine cranking, the individual cylinder having an intake port for regulating entry of the fuel into the cylinder and having a prior puddle mass estimate corresponding to a mass of fuel previously remaining in the intake port before key-off of the engine, the method comprising:
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sensing a plurality of engine parameters; determining a temperature of the engine stored at key-off; determining a new puddle mass estimate for the cylinder based on the temperature of the engine stored at key-off and the prior puddle mass estimate; and determining a desired fuel mass to be injected into the cylinder based on the new puddle mass estimate and the plurality of engine parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for determining an amount of fuel to be delivered to an individual cylinder of an internal combustion engine during engine cranking, the individual cylinder having an intake port for regulating entry of the fuel into the cylinder and having a prior puddle mass estimate corresponding to a mass of fuel previously remaining in the intake port before key-off of the engine, the system comprising:
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a plurality of sensors for sensing a plurality of engine parameters; and control logic operative to determine a temperature of the engine stored at key-off, determine a new puddle mass estimate for the cylinder based on the temperature of the engine stored at key-off and the prior puddle mass estimate, and determining a desired fuel mass to be injected into the cylinder based on the new puddle mass estimate and the plurality of engine parameters. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An article of manufacture for an internal combustion engine of an automotive engine having an individual cylinder having an intake port for regulating entry of the fuel into the cylinder and having a prior puddle mass estimate corresponding to a mass of fuel previously remaining in the intake port before key-off of the engine and the vehicle further having a plurality of sensors for sensing a plurality of engine parameters comprising:
a computer storage medium having a computer program encoded therein for determining a temperature of the engine stored at key-off, determining a new puddle mass estimate for the cylinder based on the temperature of the engine stored at key-off and the prior puddle mass estimate, and determining a desired fuel mass to be injected into the cylinder based on the new puddle mass estimate and the plurality of engine parameters.
Specification