Method for correcting deviation of static flow rates of gdi injectors and system therefor
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorKyung-Ho Ahn
Life of this patent
Estimating the term…
Abstract
A method for correcting a deviation of static flow rates of GDI injectors is provided. The method includes calculating a target pressure drop amount for each cylinder and a relative pressure drop amount for each cylinder from a detected pressure drop amount. An injection correction factor for each cylinder is primarily adjusted by comparing the relative pressure drop amount for each cylinder, with an average of relative pressure drop amounts of all cylinders. The injection correction factor is then secondarily adjusted by comparing an average of injection correction factors of all cylinders with 1.
Claims11
A method for correcting a deviation of static flow rates of gasoline direct injection (GDI) injectors, comprising:
- calculating, by a controller, a target pressure drop amount for each cylinder from a fuel compressibility equation;
- calculating, by the controller, a relative pressure drop amount for each cylinder from a detected pressure drop amount for each cylinder, which is detected in each cylinder by a fuel pressure sensor and the target pressure drop amount for each cylinder;
- primarily adjusting, by the controller, an injection correction factor for each cylinder by comparing the relative pressure drop amount for each cylinder with an average of relative pressure drop amounts of all cylinders;
- secondarily adjusting, by the controller, the injection correction factor for each cylinder by comparing an average of injection correction factors of all cylinders with 1;
- correcting, by the controller, a fuel injection amount between the cylinders based on the secondarily adjusted injection correction factor;
- and
- operating, by the controller, the GDI injectors based on the fuel injection amount.
A method for correcting a deviation of static flow rates of gasoline direct injection (GDI) injectors, comprising:
- primarily adjusting, by a controller, an injection correction factor for each cylinder that is used for correcting a fuel injection amount for each cylinder with a relative value between cylinders that is derived from an average of relative pressure drop amounts ri of all cylinders, the relative pressure drop amount being defined as the following equation:
- r
- i
- =
- dp
- i
- dp
- i
- d
- wherein dpi represents a detected pressure drop amount for each cylinder, which is detected by a fuel pressure sensor, and dpid represents a target pressure drop amount for each cylinder, which is calculated from a fuel compressibility equation;
- and
- secondarily adjusting, by the controller, the injection correction factor such that an average of the injection correction factors of all cylinders is equal to 1 to correct a relative fuel injection amount between cylinders.
Dependencies are inferred from the claim text.