Patent ID: 8187151

Claim:
A method for controlling the oil supply device of an automatic planetary transmission, which comprises a main oil pump (HP), mechanically drivably connected to the drive shaft ( 2 ) of an internal combustion engine (VM), and an auxiliary oil pump (ZP), drivable via a controllable electric motor ( 23 ), and both of the main oil pump (HP) and the auxiliary oil pump (ZP) being hydraulically connected, on a pressure side, to a main pressure line ( 29 ) pressure regulated by a main pressure regulating valve ( 33 ), the automatic transmission (ATG) being part of a parallel hybrid powertrain ( 1 ) of a motor vehicle having an input shaft ( 5 ), which may be connected via a separating clutch (K) to the drive shaft ( 2 ) of the internal combustion engine (VM) and is permanently drivably connected to the rotor ( 4 ) of an electric machine (EM), the method comprising the steps of: determining a current oil requirement (P HD — soll ) of the automatic transmission (ATG) as a function of at least one currently captured operating parameter; setting a delivery rate (P ZP ) of the auxiliary oil pump (ZP), by a corresponding actuation of the associated electric motor ( 23 ) in a combustion and a combined driving mode below a minimum input speed (n Hp <n HP —min ) of the main oil pump (HP) and in an electric driving mode, to at least a total oil requirement (P ZP ≧P HD — soll ); and setting the delivery rate (P ZP ) of the auxiliary oil pump (ZP) to at least a residual oil requirement (P ZP ≧ΔP HD =P HD — soll −P HP ) exceeding the delivery rate (P ZP ) of the main oil pump (HP), at least in the combined driving mode above the minimum input speed (n HP ≧n HP — min ) of the main oil pump (HP).