US 11,940,059 B2
Method for determining a switching state of a valve, and solenoid valve assembly
Alexander Michel, Frankfurt am Main (DE); Dirk Morschel, Frankfurt am Main (DE); and Eduard Wiens, Frankfurt am Main (DE)
Assigned to CONTINENTAL TEVES AG & CO. OHG, Frankfurt am Main (DE)
Appl. No. 17/284,920
Filed by Continental Teves AG & Co. oHG, Frankfurt am Main (DE)
PCT Filed Oct. 9, 2019, PCT No. PCT/EP2019/077400
§ 371(c)(1), (2) Date Apr. 13, 2021,
PCT Pub. No. WO2020/078806, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 10 2018 217 661.2 (DE), filed on Oct. 15, 2018.
Prior Publication US 2021/0381620 A1, Dec. 9, 2021
Int. Cl. G01R 35/00 (2006.01); F16K 31/06 (2006.01); F16K 37/00 (2006.01); G01R 33/00 (2006.01); G01V 3/08 (2006.01); G01V 13/00 (2006.01); H01F 7/18 (2006.01)
CPC F16K 37/0083 (2013.01) [F16K 31/0675 (2013.01); G01R 33/0035 (2013.01); G01R 35/00 (2013.01); G01R 35/005 (2013.01); G01V 3/08 (2013.01); G01V 3/081 (2013.01); G01V 13/00 (2013.01); H01F 2007/1861 (2013.01); H01F 2007/1888 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for determining a switching state of a valve which is actuated by a coil, the method comprising:
respectively ascertaining a current flowing through the coil and a voltage applied to the coil at several times following one another with a specified time interval,
calculating an inductance variable of the coil on the basis of the currents, the voltage and the specified time interval, and
determining the switching state of the valve on the basis of the inductance variable of the coil,
wherein the inductance variable of the coil is compared with a first end value and a second end value,
wherein, when the inductance variable of the coil is at most a predetermined distance from the first end value, a first switching state is determined, and
wherein, when the inductance variable of the coil is at most a predetermined distance from the second end value, a second switching state is determined.