US 12,235,146 B2
Method and device for ascertaining the fluid injection quantity of an injection system
Anselm Wieland, Cologne (DE)
Assigned to Vitesco Technologies GmbH, Regensburg (DE)
Filed by Vitesco Technologies GmbH, Regensburg (DE)
Filed on Feb. 20, 2023, as Appl. No. 18/171,420.
Application 18/171,420 is a continuation of application No. PCT/EP2021/073087, filed on Aug. 19, 2021.
Claims priority of application No. 10 2020 210 984.2 (DE), filed on Aug. 31, 2020.
Prior Publication US 2023/0204400 A1, Jun. 29, 2023
Int. Cl. G01F 22/02 (2006.01); F02D 41/38 (2006.01); G05B 19/416 (2006.01)
CPC G01F 22/02 (2013.01) [F02D 41/3809 (2013.01); G05B 19/416 (2013.01); G05B 2219/37371 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for ascertaining a fluid injection quantity of an injection system, the injection system having a high-pressure pump, a high-pressure region that adjoins the high-pressure pump, a pressure sensor, and an injector that is fed from the high-pressure region, the method comprising:
detecting a measurement signal using the pressure sensor during operation of the injection system, the measurement signal characterizing a fluid pressure in the high-pressure region;
segmenting a first pressure profile from the measurement signal, the first pressure profile characterizes the pressure profile prior to a fluid injection using the injector;
segmenting a second pressure profile from the measurement signal, the second pressure profile characterizes the pressure profile after the fluid injection using the injector;
determining a first probability density function prior to the fluid injection and a second probability density function after the fluid injection by performing a kernel density estimation using the first pressure profile and the second pressure profile;
determining a pressure difference from the first probability density function and the second probability density function;
determining the fluid injection quantity using the pressure difference; and
injecting the fluid injection quantity into combustion chambers of an internal combustion engine,
wherein a triangular kernel and/or a predetermined bandwidth is being used in the kernel density estimation.