METHOD FOR CONTROLLING AN INJECTION VALVE, FUEL INJECTION SYSTEM, AND INTERNAL COMBUSTION ENGINE
First Claim
1. A method for controlling a piezoelectrically actuated injection valve of a fuel injection system for an internal combustion engine, said method comprising:
- recording a voltage curve of a voltage present at a piezoelectric actuator of the injection valve and a time characteristic curve of an electric charge which is shifted in a circuit comprising the piezoelectric actuator during a reference injection performed by the injection valve,computationally determining a force curve of a force applied by the piezoelectric actuator to a moving closing element of the injection valve during the reference injection from the voltage curve and the time characteristic curve of the electric charge,determining a location of a maximum of the force curve,specifying at least one of an activation time instant, an activation duration, and an activation pulse intensity for at least one subsequent injection as a function of a time offset between an activation time instant selected for the reference injection and the maximum of the force curve.
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Accused Products
Abstract
A method and system for controlling an injection valve has the following steps: recording a voltage curve of a voltage present at a piezoelectric actuator of the injection valve and a time characteristic curve of an electric charge which is shifted in a circuit with the piezoelectric actuator during a reference injection, computationally determining a force curve of a force applied by the piezoelectric actuator to a moving closing element of the injection valve during the reference injection from the voltage curve and the time characteristic curve of the electric charge, determining a location of a maximum of the force curve,—specifying an activation time instant and/or an activation duration and/or an activation pulse intensity for at least one subsequent injection as a function of a time offset between an activation time instant selected for the reference injection and the maximum of the force curve.
31 Citations
20 Claims
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1. A method for controlling a piezoelectrically actuated injection valve of a fuel injection system for an internal combustion engine, said method comprising:
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recording a voltage curve of a voltage present at a piezoelectric actuator of the injection valve and a time characteristic curve of an electric charge which is shifted in a circuit comprising the piezoelectric actuator during a reference injection performed by the injection valve, computationally determining a force curve of a force applied by the piezoelectric actuator to a moving closing element of the injection valve during the reference injection from the voltage curve and the time characteristic curve of the electric charge, determining a location of a maximum of the force curve, specifying at least one of an activation time instant, an activation duration, and an activation pulse intensity for at least one subsequent injection as a function of a time offset between an activation time instant selected for the reference injection and the maximum of the force curve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fuel injection system for an internal combustion engine, comprising for each cylinder of the internal combustion engine in each case an injection valve that is to be actuated by means of a piezoelectric actuator and a control device for activating the injection valves, the control device being configured by programming means for controlling the injection valves:
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to record a voltage curve of a voltage present at a piezoelectric actuator of the injection valve and a time characteristic curve of an electric charge which is shifted in a circuit comprising the piezoelectric actuator during a reference injection performed by the injection valve, to computationally determine a force curve of a force applied by the piezoelectric actuator to a moving closing element of the injection valve during the reference injection from the voltage curve and the time characteristic curve of the electric charge, to determine a location of a maximum of the force curve, to specify at least one of an activation time instant, an activation duration, and an activation pulse intensity for at least one subsequent injection as a function of a time offset between an activation time instant selected for the reference injection and the maximum of the force curve. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification