Method of determining a hydraulic timing of a fuel injector
AssigneePhinia Delphi Luxembourg Sarl
InventorBaptiste Perrot
Life of this patent
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Abstract
A method of determining a hydraulic timing of a fuel injector in an internal combustion engine, wherein the injector is coupled to a fuel rail comprising a pressure sensor. The method comprises: acquiring fuel pressure data, obtained by the pressure sensor, representing fuel pressure in the fuel rail over an acquisition window comprising an injection event of the injector; determining a slope parameter corresponding to a pressure drop consequential to the injection event, the slope parameter being read from a slope map; configuring a pressure drop model based on the slope parameter; and operating a fitting operation wherein the pressure drop model is fitted to the fuel pressure data, and wherein the hydraulic timing is derived from the pressure drop model.
Claims19
A method of determining a hydraulic timing of a fuel injector in an internal combustion engine, wherein the injector is coupled to a fuel rail comprising a pressure sensor, the method comprising:
- acquiring fuel pressure data, obtained by the pressure sensor, representing fuel pressure in the fuel rail over an acquisition window comprising an injection event of the injector;
- determining a slope parameter corresponding to a pressure drop consequential to the injection event, the slope parameter being read from a slope map;
- configuring a pressure drop model based on the slope parameter;
- and
- operating a fitting operation wherein the pressure drop model is fitted to the fuel pressure data, and wherein the hydraulic timing is derived from the pressure drop model;
- wherein the pressure drop model is based on the slope parameter as well as on a maximum pressure, Pmax, and on a minimum pressure, Pmin, corresponding respectively to average fuel rail pressures before and after the injection event.
A method of determining a hydraulic timing of a fuel injector in an internal combustion engine, wherein the injector is coupled to a fuel rail comprising a pressure sensor, the method comprising:
- acquiring fuel pressure data, obtained by the pressure sensor, representing fuel pressure in the fuel rail over an acquisition window comprising an injection event of the injector;
- determining a slope parameter corresponding to a pressure drop consequential to the injection event, the slope parameter being read from a slope map;
- configuring a pressure drop model based on the slope parameter;
- and
- operating a fitting operation wherein the pressure drop model is fitted to the fuel pressure data, and wherein the hydraulic timing is derived from the pressure drop model;
- wherein the pressure drop model describes a function having a first section at Pmax, a second section connecting the first section to a third section at Pmin, the second section corresponding to a straight line having a slope matching to the slope parameter.
A method of determining a hydraulic timing of a fuel injector in an internal combustion engine, wherein the injector is coupled to a fuel rail comprising a pressure sensor, the method comprising:
- acquiring fuel pressure data, obtained by the pressure sensor, representing fuel pressure in the fuel rail over an acquisition window comprising an injection event of the injector;
- determining a slope parameter corresponding to a pressure drop consequential to the injection event, the slope parameter being read from a slope map;
- configuring a pressure drop model based on the slope parameter;
- and
- operating a fitting operation wherein the pressure drop model is fitted to the fuel pressure data, and wherein the hydraulic timing is derived from the pressure drop model;
- wherein operating the fitting operation comprises computing the pressure drop model for a plurality of timings corresponding to a sampling frequency over an analysis window, and determining a corresponding fitting index reflecting the degree of matching between the fuel pressure data and the pressure drop model, and selecting the timing at which the best index is obtained;
- wherein the fitting index represents the area between the curve described by the pressure data and the pressure drop model, and wherein the timing corresponding to the fitting index representing the smallest area is selected as hydraulic timing.
Dependencies are inferred from the claim text.