US 11,939,932 B2
Method, program product and computer for estimating the static flow rate of a piezoelectric injector
Quentin Dussardier, Toulouse (FR); Morgan Drouyer, Toulouse (FR); and Edouard Gambier, Toulouse (FR)
Assigned to VITESCO TECHNOLOGIES GMBH, Regensburg (DE)
Appl. No. 18/011,463
Filed by VITESCO TECHNOLOGIES GMBH, Regensburg (DE)
PCT Filed Jul. 1, 2021, PCT No. PCT/EP2021/068254
§ 371(c)(1), (2) Date Dec. 19, 2022,
PCT Pub. No. WO2022/017759, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 2007581 (FR), filed on Jul. 20, 2020.
Prior Publication US 2023/0279821 A1, Sep. 7, 2023
Int. Cl. F02D 41/20 (2006.01); F02D 41/24 (2006.01); F02M 47/02 (2006.01); F02M 63/00 (2006.01); F02M 65/00 (2006.01)
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
OG exemplary drawing
 
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.