| 摘要 |
The control arrangement for a hydraulic system has a pressure control valve (19) for an adjustable pump (10) which has a working cylinder (13) for actuating an implement, in particular a plough. The working depth of the implement is to be kept constant, which requires a desired/actual-value comparison. The actual value is signalled to an electronic control device (33), for example via a scanning device. The control device (33) controls an electromagnetically operable proportional pressure valve (26) which in turn influences the pressure controller (19). In interaction with these devices, the working pressure in the cylinder is kept constant by appropriate setting of the pump (10). The adjustable pump is a pressure-controlled pump with reversible delivery direction while the pressure side remains the same. In this way, accurate plough-depth control is obtained in an especially efficient operation, since, for example during a lowering movement of the working cylinder, the lowering energy is fed back as torque to the motor driving the pump. <IMAGE>
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