Method for bounce suppression of a valve switched by a piezo actuator
a piezo actuator and valve member technology, applied in non-mechanical valves, electrical control, machines/engines, etc., can solve the problems of affecting the abovementioned properties of the internal combustion engine in an undesired way, affecting the precision of the closing process, and rapid material wear, so as to increase the restoring force of the piezo crystal
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[0019]FIG. 1 shows a diagram of the curve over time of charging voltage Up of a piezo actuator over a valve cycle Z along time t. Starting at time a in the diagram in FIG. 1.3, at which the piezo actuator is not charged and the valve is closed, valve lift hv at time a thus amounting to zero, charging current Ip begins to flow, according to the diagram in FIG. 1.2. Charging current Ip flows as a constant current from time a to time b. Within this time interval a-b, the piezo actuator builds up charging voltage Up at time b in the diagram in FIG. 1.1. Because of the unbraked extension, and because of the masses connected with force-locking to the piezo actuator, the valve member still vibrates back and forth about the opening point at time b and shortly thereafter, according to the diagram in FIG. 1.3. This mechanical vibration is reflected in charging voltage Up in charging voltage diagram in FIG. 1.1. The valve, now opened, remains in the open position of time b until time c. Within th
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