Patent ID: 11939932
Assignee: VITESCO TECHNOLOGIES GMBH
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A method for determining a static flow rate of a piezo-electric injector of a combustion engine injection system, the piezo-electric injector comprised of a needle and a piezo-electric actuator that controls a valve of the injector, the injection system also including an electric generator that sends electric current pulses to the piezo-electric actuator of the injector, and a voltage sensor that measures voltage values at terminals of the piezo-electric actuator, said method comprising the steps of:
sending, via the electric generator, an electric current pulse to the piezo-electric actuator, such that the piezo-electric actuator contacts the valve without opening the valve, the electric generator sending the electric current pulse during a time of an injection cycle of the injector when the needle is returning from an open position to a closed position;
measuring, via the voltage sensor, a plurality of voltage values of the piezo-electric actuator; and
determining the static flow rate of the piezo-electric injector based on the plurality of voltage values measured of the piezo-electric actuator.