Method for determining drive voltage of fuel injection valve piezoelectric actuator e.g. for common-rail diesel or petrol driven engine involves measuring parameter corresponding to pressure in hydraulic coupler after injection process

A method for determining the control voltage for a piezoelectric actuator of an injection valve in which at first the pressure in a hydraulic coupler is measured indirectly before the next injection process. The pressure is measured since the piezoelectric actuator is mechanically coupled to the hydraulic coupler so that the pressure induces a corresponding piezo voltage in the actuator. This induced voltage is used before the next injection process for correcting the control voltage for the actuator. Too low an induced voltage is valued as a fault for recognizing an intermittent injection operation. The injection valve may be used for a common rail system for fuel injection in a gasoline or diesel engine

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