Method and system for controlling fuel delivery during transient engine conditions
AssigneeFord Global Technologies, LLC
InventorsChris Dominic Kapolnek, Jeffrey Allen Doering, Xiaoying Zhang
Life of this patent
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Abstract
A method and system for controlling fuel mass during transient engine conditions is based on an open loop transient fuel compensation algorithm so as to provide transient fuel compensations that address drivability requirements associated with the acceleration mode and deceleration mode of engine operation as well as the ease of the calibration during engine cranking mode.
Claims22
In a method for determining fuel mass to be delivered to an individual cylinder of an internal combustion engine during transient engine operation, the steps comprising:
- determining a desired in-cylinder fuel mass for combustion based on a plurality of engine parameters,
- determining whether a current mode of engine operation is an acceleration mode or a deceleration mode, and
- determining a transient fuel mass compensation factor for the determined current mode of engine operation.
A method for determining fuel mass to be delivered to an individual cylinder of an internal combustion engine during transient engine operation, comprising:
- determining a desired in-cylinder fuel mass for combustion based on a plurality of engine parameters,
- determining a value of a time constant and a value of a gain for an acceleration mode of engine operation,
- determining a value of a time constant and a value of a gain for a deceleration mode of engine operation,
- determining whether a current mode of engine operation is an acceleration mode or a deceleration mode,
- determining a filtered desired in-cylinder fuel mass based on said desired in-cylinder fuel mass, a prior injection history of the cylinder, and a value of the time constant determined in response to the determined current mode of engine operation, and
- determining a transient fuel compensation factor by obtaining a difference between said desired in-cylinder fuel mass and said filtered desired in-cylinder fuel mass and multiplying said difference by a value of the gain determined for the determined current mode of engine operation.
A system for determining fuel mass to be delivered to an individual cylinder of an internal combustion engine during transient engine operation, comprising:
- a plurality of sensors for sensing a plurality of engine parameters, and control logic medium operative to determine a desired in-cylinder fuel mass for combustion based on a plurality of engine parameters, a current mode of engine operation as an acceleration mode or a deceleration mode, and a transient fuel mass compensation factor for the determined current acceleration mode or deceleration mode of engine operation.
A system for determining fuel mass to be delivered to an individual cylinder of an internal combustion engine during transient engine operation, comprising:
- a plurality of sensors for sensing a plurality of engine parameters, and control logic medium operative to determine a desired in-cylinder fuel mass for combustion based on a plurality of engine parameters, a value of a time constant and a value of a gain for an acceleration mode of engine operation, a value of a time constant and a value of a gain for a deceleration mode of engine operation, whether a current mode of engine operation is an acceleration mode or a deceleration mode, a filtered desired in-cylinder fuel mass based on said desired in-cylinder fuel mass, a prior injection history of the cylinder, and a value of the time constant determined in response to the determined current mode of engine operation, and a transient fuel mass compensation factor by obtaining a difference between said desired in-cylinder fuel mass and said filtered desired in-cylinder fuel mass and multiplying said difference by a value of the gain multiplier determined in response to the determined current mode of engine operation.
Dependencies are inferred from the claim text.