US 11,913,506 B2
Method for the open-loop control of an electrically controllable valve in a vehicle transmission
Anton Fritzer, Markdorf (DE); Thilo Schmidt, Meckenbeuren (DE); Andreas Schmidt, Ravensburg (DE); Valentine Vincent, Friedrichshafen (DE); Christoph Köhler, Bodolz (DE); Jonas Knör, Erbach (DE); Michael Miller, Leutkirch (DE); Mario Hasel, Wangen (DE); Jakob Mayer, Kressbronn (DE); Christian Hunger, Eriskirch (DE); and Fabian Schöniger, Tettnang (DE)
Assigned to ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed on Jun. 7, 2023, as Appl. No. 18/330,804.
Claims priority of application No. 10 2022 205 851.8 (DE), filed on Jun. 8, 2022.
Prior Publication US 2023/0400069 A1, Dec. 14, 2023
Int. Cl. F16D 48/06 (2006.01); F16H 61/06 (2006.01); F16H 61/00 (2006.01)
CPC F16D 48/066 (2013.01) [F16D 2500/1027 (2013.01); F16D 2500/10412 (2013.01); F16D 2500/3024 (2013.01); F16D 2500/3025 (2013.01); F16H 61/0021 (2013.01); F16H 61/061 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for the open-loop control of an electrically controllable valve in a vehicle transmission that includes a hydraulic circuit, wherein the valve sets a defined pressure in the hydraulic circuit as a function of a control current in order to selectively actuate a clutch, the method comprising:
obtaining (20) a target pressure specification (p_Soll) that represents a desired target pressure in the hydraulic circuit;
converting (26) the target pressure specification (p_Soll) into a target volume flow rate (Q_soll) of a fluid in the hydraulic circuit;
determining (42) a valve volume flow rate (Q_Ventil) as a function of the target volume flow rate (Q_soll) and as a function of parameters (44) that represent system properties (P_SysLim) of the hydraulic circuit, wherein the valve volume flow rate (Q_Ventil) represents a volume flow rate through the valve;
determining (46) a pressure drop at the valve due to flow forces as a function of the valve volume flow rate (Q_Ventil);
determining (48) a compensated valve output pressure (p_VentilSoll) as a function of the valve volume flow rate (Q_Ventil) and the pressure drop;
determining (58) the electric control current (i_Endstufe) as a function of the compensated valve output pressure (p_VentSoll); and
activating the valve with the electric control current (i_Endstufe).