CPC F02D 41/2096 (2013.01) [F02D 41/2467 (2013.01); F02M 47/027 (2013.01); F02M 63/0026 (2013.01); F02M 65/001 (2013.01); F02M 65/005 (2013.01); F02D 2041/2051 (2013.01)] | 17 Claims |
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.
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