Method for the open-loop control of an electrically controllable valve in a vehicle transmission

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).