| 摘要 |
A hydraulic system of a transmission comprises a main transmission pump that can be driven by torque transmitted via the transmission unit and with an auxiliary pump that can be driven by an electric machine, by which primary and secondary pressure circuits can be supplied with hydraulic fluid. Pressure sides of the main transmission pump and the auxiliary pump are connected to the primary pressure circuit upstream of a pressure relief valve provided for adjusting a main pressure in the primary pressure circuit. The pressure relief valve is arranged between the pressure sides of the main transmission pump and the auxiliary pump and the secondary pressure circuit. The pressure side of the auxiliary pump can be actively connected with the secondary pressure circuit, via a hydraulic line which can be blocked in the direction toward the primary and secondary pressure circuits, and which bypasses the pressure-relief valve.
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