A method for determining a for the supply of different hydraulic consumers of a vehicle transmission required delivery volume of an adjustable pump device

摘要

It is a method for determining an for the supply of different hydraulic consumers of a vehicle transmission (2) required delivery volume of an adjustable pump unit (3) of a hydraulic system (1) of the vehicle transmission (2) described. A desired - value of the delivery volume of the pumping device (3) is predetermined, to which a is - value of the system pressure (p _ sys) in the pressurized hydraulic circuit (6) is determined by measurement, of a requested, - value of the system pressure (p _ sys) in the pressurized hydraulic circuit (6) corresponds at least approximately to. Subsequently, the if - value of the delivery volume of the pumping device (3) is reduced until the is - value of the system pressure (p _ sys) a defined threshold is smaller than the currently requested, - value of the system pressure (p _ sys) falls below. In the operating point of the transmission (2), in which the threshold is not reached, is the sum of the to the hydraulic consumers of the transmission (2) via the pressurized hydraulic circuit (6) is determined which is guided in the hydraulic fluid volume streams. The sum by the current delivery volume of the pumping device (3) is pulled off and the respectively selected operating point, is intended to - value preset of the delivery volume current of the pumping device (3), in order to increase the result of the subtraction.