| 摘要 |
An electrohydraulic device (10) for controlling lifting gear (11) for a tractor (12) with coupled-on plough is proposed, which plough has an electromechanical three-point controller (22, 36) to which actual values (38) and set values (42) can be input mechanically via shafts (74, 79) which plug into one another and which forms an electric output signal. The three-point controller (22, 36) actuates via a reversing relay (33) an electric motor (34) for two directions of rotation, the input signals (54) of which motor (34) are hydraulically amplified in terms of magnitude and direction in a subsequent control (72). By using mass-produced components such as circuit breaker switches (84, 85) in the three-point controller (22, 36), a window wiper motor (34) and commercially available switches and relays (29, 32), the control device (10) is cost-effective to construct and its time behaviour and transfer function are easily adjustable. <IMAGE>
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