Method and Control Unit for Operating a Hydraulic System of a Transmission of a Motor Vehicle

A method for operating a hydraulic system (1) of a transmission (2) of a motor vehicle, the hydraulic system (1) including a primary hydraulic circuit (10) for pressure actuation of shift elements of the transmission (2), a secondary hydraulic circuit (11) for cooling and/or lubricating assemblies of the transmission (2), and at least one hydraulic pump (3) that delivers a volumetric flow of oil into the primary hydraulic circuit (10) and into the secondary hydraulic circuit (11), the method comprising:

• ascertaining an actual volumetric flow of oil that is deliverable into the primary hydraulic circuit (10) by the at least one hydraulic pump (3);
• ascertaining a target volumetric flow of oil that is required by the primary hydraulic circuit (10);
• ascertaining an excess volumetric flow of oil depending on the actual volumetric flow of oil and the target volumetric flow of oil;
• and
• distributing the excess volumetric flow of oil to the shift elements of the transmission (2) to be actuated, depending on hydraulic capacity of the shift elements of the transmission (2) to be actuated, and limiting pressure actuation of the shift elements of the transmission (2) to be actuated based at least in part on the excess volumetric flow of oil.