US 12,152,610 B2
Method for minimizing the dither hum on a valve
Ingo Kallfass, Bretten-Diedelsheim (DE); Steffen Knapper, Vaihingen/Enz (DE); and Reiner Kunz, Sachsenheim (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Oct. 28, 2022, as Appl. No. 18/050,638.
Claims priority of application No. 10 2021 212 309.0 (DE), filed on Nov. 2, 2021.
Prior Publication US 2023/0139395 A1, May 4, 2023
Int. Cl. F16K 31/06 (2006.01); F15B 13/04 (2006.01)
CPC F15B 13/0402 (2013.01) [F16K 31/0613 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for operating a valve, comprising:
preloading a linearly movable control slide of the valve with at least one spring in a direction of a zero position;
coupling at least one solenoid to the control slide, such that the control slide is movable away from the zero position by application of a current to the at least one solenoid;
measuring an actual instantaneous position of the control slide using a position sensor;
assigning each solenoid of the at least one solenoid a current control device;
influencing, using the corresponding current control device, the current through the corresponding solenoid based on an instantaneous current control variable, the instantaneous current control variable dependent on a dither current control variable;
determining an actual dither amplitude from the actual instantaneous position using a band-pass filter; and
causing the actual dither amplitude to not fall below a predetermined minimum dither amplitude by adjusting an amplitude of the dither current control variable and/or of a waveform of the dither current control variable using a dither controller.