Method for operating a fuel injection system
AssigneeRobert Bosch GmbH
InventorsLars Empacher, Rene Zieher, Stephan Olbrich, Michael Schenk
Life of this patent
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Abstract
A fuel injection system for an internal combustion engine in which pressurized fuel is made available in a pressure accumulator and a fuel pressure prevailing in the pressure accumulator is ascertained with the aid of a pressure sensor and in which the fuel enters a combustion chamber of the internal combustion engine through at least one fuel injection device. A slope of a curve, which links a pressure difference in the pressure accumulator during a fuel injection to an injected fuel quantity, is ascertained and the fuel pressure prevailing in the pressure accumulator is inferred from the slope.
Claims12
A method for operating a fuel injection system for an internal combustion engine in which pressurized fuel is made available in a pressure accumulator and a fuel pressure prevailing in the pressure accumulator is ascertained with the aid of a pressure sensor and in which the fuel enters a combustion chamber of the internal combustion engine through at least one fuel injection device, the method comprising:
- ascertaining, via a control unit, a slope of a curve, which links a pressure difference in the pressure accumulator during a fuel injection to an injected fuel quantity, wherein the pressure difference and the injected fuel quantity are input to the control unit;
- and
- inferring, via the control unit, the fuel pressure prevailing in the pressure accumulator from the slope;
- and
- outputting, via the control unit, the inferred fuel pressure;
- wherein to ascertain the slope, the fuel quantity injected by the fuel injection device is changed cyclically.
A method for operating a fuel injection system for an internal combustion engine in which pressurized fuel is made available in a pressure accumulator and a fuel pressure prevailing in the pressure accumulator is ascertained with the aid of a pressure sensor and in which the fuel enters a combustion chamber of the internal combustion engine through at least one fuel injection device, the method comprising:
- ascertaining, via a control unit, a slope of a curve, which links a pressure difference in the pressure accumulator during a fuel injection to an injected fuel quantity, wherein the pressure difference and the injected fuel quantity are input to the control unit;
- and
- inferring, via the control unit, the fuel pressure prevailing in the pressure accumulator from the slope;
- and
- outputting, via the control unit, the inferred fuel pressure;
- wherein the injection quantity at a single combustion chamber is changed for ascertaining the slope, and a fuel quantity injected into the remaining combustion chambers of the internal combustion engine in each case is metered in such a way that a torque generated by the internal combustion engine is constant in the sum at least approximately.
A control or regulating device for an internal combustion engine, including a fuel injection system in which pressurized fuel is made available in a pressure accumulator and a fuel pressure prevailing in the pressure accumulator is ascertained with the aid of a pressure sensor and in which the fuel enters a combustion chamber of the internal combustion engine throughout at least one fuel injection device, comprising:
- a control unit configured to perform the following:
- ascertaining, via a control unit, a slope of a curve, which links a pressure difference in the pressure accumulator during a fuel injection to an injected fuel quantity, wherein the pressure difference and the injected fuel quantity are input to the control unit;
- and
- inferring, via the control unit, the fuel pressure prevailing in the pressure accumulator from the slope;
- and
- outputting, via the control unit, the inferred fuel pressure;
- wherein to ascertain the slope, the fuel quantity injected by the fuel injection device is changed cyclically.
A computer-readable storage medium storing a computer program, which is executable by a processor, comprising:
- a program code arrangement having program code operating a fuel injection system in which pressurized fuel is made available in a pressure accumulator and a fuel pressure prevailing in the pressure accumulator is ascertained with the aid of a pressure sensor and in which the fuel enters a combustion chamber of the internal combustion engine throughout at least one fuel injection device, by performing the following:
- ascertaining, via a control unit, a slope of a curve, which links a pressure difference in the pressure accumulator during a fuel injection to an injected fuel quantity, wherein the pressure difference and the injected fuel quantity are input to the control unit;
- and
- inferring, via the control unit, the fuel pressure prevailing in the pressure accumulator from the slope;
- and
- outputting, via the control unit, the inferred fuel pressure;
- wherein to ascertain the slope, the fuel quantity injected by the fuel injection device is changed cyclically.
A storage medium storing a computer program, the computer program, which is executable by a processor, comprising:
- a program code arrangement having program code operating a fuel injection system in which pressurized fuel is made available in a pressure accumulator and a fuel pressure prevailing in the pressure accumulator is ascertained with the aid of a pressure sensor and in which the fuel enters a combustion chamber of the internal combustion engine throughout at least one fuel injection device, by performing the following:
- ascertaining, via a control unit, a slope of a curve, which links a pressure difference in the pressure accumulator during a fuel injection to an injected fuel quantity, wherein the pressure difference and the injected fuel quantity are input to the control unit;
- and
- inferring, via the control unit, the fuel pressure prevailing in the pressure accumulator from the slope;
- and
- outputting, via the control unit, the inferred fuel pressure;
- wherein to ascertain the slope, the fuel quantity injected by the fuel injection device is changed cyclically.
Dependencies are inferred from the claim text.