Method for correcting injection quantities and/or times of a fuel injector
AssigneeContinental Automotive GmbH
InventorChristian Hauser
Life of this patent
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Abstract
In a method for individually correcting injection quantities and/or times (mf1, mf2, mf . . . ; ti1, ti2, ti . . . ) in particular for a ballistic operating range of a fuel injector (1, 2, . . . ), a quantity deviation of an actual injection quantity (mf1, mf2, mf . . . ) from a nominal injection quantity (mfnom) of the fuel injector (1, 2, . . . ) during operation of the fuel injector (1, 2, . . . ) is determined, and a typical injection characteristic (fup1, fup2, fup . . . ) of the fuel injector (1, 2, . . . ) is adapted to a nominal injection characteristic (fupnom) based on the quantity deviation. Furthermore, a controller, in particular an engine controller may implement the above method.
Claims13
A method for individually correcting at least one of injection quantities and injection times for a fuel injector in an engine of the vehicle, the method comprising:
- measuring an actual injection quantity of the fuel injector at a particular time,
- accessing a typical injection characteristic curve for the fuel injector, the typical injection characteristic curve relating to a plurality of fuel injectors,
- generating an injector-specific characteristic injection curve based at least on the measured actual injection quantity at the particular time,
- during a driving operation of the vehicle, determining an injection quantity deviation between the measured actual injection quantity at the particular time and a nominal injection quantity corresponding to the particular time as defined by a nominal injection characteristic curve for the fuel injector,
- determining an injection time deviation based on the determined injection quantity deviation,
- adjusting the injector-specific characteristic injection curve based on the determined injection time deviation, including:
- laterally shifting the injector-specific characteristic injection curve by an amount corresponding to the determined injection time deviation, and
- rotating the injector-specific characteristic injection curve based on stored gradient data for a nominal injection characteristic curve corresponding to the laterally shifted injector-specific characteristic injection curve,
- generating a correction function based on the adjusted injector-specific characteristic injection curve, the correction function defining corrected injection times for providing setpoint injection quantities, and
- subsequently actuating the fuel injector based on the correction function.
A controller for individually correcting at least one of injection quantities and injection times for a fuel injector in an engine of a vehicle, wherein the controller is configured:
- to measure an actual injection quantity of the fuel injector at a particular time,
- to access a typical injection characteristic curve for the fuel injector, the typical injection characteristic curve relating to a plurality of fuel injectors,
- to generate an injector-specific characteristic injection curve based at least on the measured actual injection quantity at the particular time,
- to determine, during a driving operation of the vehicle, an injection quantity deviation between the measured actual injection quantity at the particular time and a nominal injection quantity corresponding to the particular time as defined by a nominal injection characteristic curve for the fuel injector,
- to determine an injection time deviation based on the determined injection quantity deviation,
- to adjust the injector-specific characteristic injection curve based on the determined injection time deviation, including:
- laterally shifting the injector-specific characteristic injection curve by an amount corresponding to the determined injection time deviation, and
- rotating the injector-specific characteristic injection curve based on stored gradient data for a nominal injection characteristic curve corresponding to the laterally shifted injector-specific characteristic injection curve,
- to generate a correction function based on the adjusted injector-specific characteristic injection curve, the correction function defining corrected injection times for providing setpoint injection quantities, and
- to subsequently actuate the fuel injector based on the correction function.
Dependencies are inferred from the claim text.