US 11,913,568 B2
Method for determining a switching state of a valve, and solenoid valve assembly
Bartosz Maj, Frankfurt am Main (DE); Holger Kollmann, Frankfurt am Main (DE); Tomislav Milic, Frankfurt am Main (DE); Alexander Schönbohm, Frankfurt am Main (DE); Ralf Schröder, Frankfurt am Main (DE); Marc Lenz, Frankfurt am Main (DE); Marcus Bletz, Frankfurt am Main (DE); Jurij Schmidt, Frankfurt am Main (DE); and Dieter Dinkel, Frankfurt am Main (DE)
Assigned to Continental Teves AG & Co. oHG, (DE)
Appl. No. 17/284,869
Filed by Continental Teves AG & Co. oHG, Frankfurt am Main (DE)
PCT Filed Oct. 9, 2019, PCT No. PCT/EP2019/077393
§ 371(c)(1), (2) Date Apr. 13, 2021,
PCT Pub. No. WO2020/078805, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 10 2018 217 663.9 (DE), filed on Oct. 15, 2018.
Prior Publication US 2021/0388921 A1, Dec. 16, 2021
Int. Cl. F16K 37/00 (2006.01); B60T 8/36 (2006.01); B60T 8/40 (2006.01); G01R 31/72 (2020.01); H01F 7/18 (2006.01); G01R 31/28 (2006.01)
CPC F16K 37/0083 (2013.01) [B60T 8/3655 (2013.01); B60T 8/4045 (2013.01); G01R 31/72 (2020.01); H01F 7/1844 (2013.01); G01R 31/2829 (2013.01); H01F 2007/185 (2013.01); H01F 2007/1861 (2013.01); H01F 2007/1888 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for determining a switching state of an inlet valve that is actuated by a coil, wherein the method comprises:
respectively ascertaining a current flowing through the coil and a voltage applied to the coil at several times which follow one another with a prespecified time interval, calculating an inductance variable of the coil based on the currents, the voltage and the time interval,
determining the switching state based on the inductance variable, and
monitoring the switching state of the inlet valve by monitoring whether a tappet of the inlet valve falls back to a tappet starting position after the coil is switched off, and without a non-return valve.