| 摘要 |
<p>The invention concerns an automatic control system for the transfer of the drive power between a tractor (10) and a trailer (11), which said system comprises a closed hydraulic circuit (43) that operates the drive wheels of the tractor (10) and an open hydraulic circuit (25) that operates the drive wheels (17a, 17b) of the trailer. In the system, the closed hydraulic circuit (43) of the tractor (10) comprises a pump (15) and a hydraulic motor (16) driven by the pump and, in a corresponding way, the open hydraulic circuit (25) of the trailer (11) comprises a motor or motors (21a, 21b) driven by a pump (20). The control system comprises a line (42) that transmits a control pressure (P2) from the closed circuit (43) of the tractor (10) to the open circuit (25) of the trailer (11). When the resistance to traction increases, e.g. when driving up a steep hill, the pressure (P2) in said transmitting line (42) increases and, by means of said pressure (P2), the hydraulic pump (20) of the trailer (11), which is advantageously an adjustable-displacement pump, is controlled to produce a higher pressure to the motor or motors (21a and/or 21b) driven by the pump. In a corresponding way, when the drive power requirement of the tractor (10) becomes lower, the operating pressure in the hydraulic circuit (27b, 29a, 29b, 28a, 28b) of the drive power transmission in the trailer (11) is lowered.</p> |
