| 摘要 |
A hydraulic actuating device for a closure assembly, for example of a vehicle, which closure assembly comprises a closure element which can be moved between a closed position, in which the closure element closes off an opening, and an opened position. The hydraulic actuating device comprises a hydraulic actuator for moving the closure element, which actuator has a housing having a closing chamber and an opening chamber. Further provided are a hydraulic pump having an associated electric pump motor and a reservoir for hydraulic fluid. The hydraulic actuating device further comprises a first pressure-limit valve, which is connected to the opening chamber, and a second pressure-limit valve, which is connected to the closing chamber. Control means are further provided for controlling the supply of hydraulic fluid under pressure to the opening chamber or to the closing chamber of the actuator. A hydraulic flow sensor connected to the control means is provided at each pressure-limit valve, such that the one or more hydraulic flow sensors detect the presence of a flow of hydraulic fluid through the pressure-limit valve to the reservoir. The control means are adapted-if a flow sensor detects a flow of hydraulic fluid-to reverse the supply of hydraulic fluid under pressure to the actuator, so that the opening motion is changed to a closing motion or vice versa.
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