Patent ID: 6499464
Filing Date: 2002-12-31
Classification: F02D,F02M

Abstract:
A method for determining a control voltage for a piezoelectric actuator of an injection valve, the injection valve being usable for injecting a quantity of liquid under a high pressure into a hollow space, the piezoelectric actuator being connected in a bore of the injection valve to an adjoining hydraulic coupler via a control piston functioning as a hydraulic transmission, a high pressure being exertable on the control piston having a sealing element for moving the sealing element into positions between a first seat and a second seat, the hydraulic coupler being rechargeable via an appropriate passage after an injection process, the method comprising:measuring a parameter corresponding to a pressure in the hydraulic coupler after an injection process; and determining a value of the control voltage of the piezoelectric actuator by using the parameter and a predefined algorithm.