Patent ID: 11746901

Abstract:
A device for operating a parking lock (34) of a transmission (3) includes an engagement spring (345) for engaging the parking lock (34), a hydraulic actuator (340) for disengaging the parking lock (34), an electrohydraulic control unit (35) for hydraulically actuating the actuator (340), and an electronic control unit (36) for electrically actuating the actuator (340) and the electrohydraulic control unit (35). The actuator (340) includes a hydraulic piston (341) operatively connected to the parking lock (34), is actuatable by system pressure (P_sys) of the electrohydraulic control unit (35) via a pressure line (347) upon disengagement of the parking lock (34), and is mechanically interlockable by an interlocking device (342). A choke unit (353) includes an orifice (353) and a non-return valve (354) and is installed in the pressure line (347) downstream from the hydraulic piston (341).