| 摘要 |
A hydrostatic transmission using a variable displacement pump is driven by an internal combustion engine and has a control system wherein a single pedal or lever controls both the engine throttle and pump displacement. The position of the pedal or control lever determines both the throttle opening and the input torque to the hydrostatic transmission. The control automatically varies the pump displacement to maintain the selected input torque against the momentary load conditions on the hydraulic motor in accordance with the torque-speed characteristics of the engine. The control utilizes a hydraulic bridge circuit, having in its feedback leg, a pair of laminar flow restrictions varied in accordance with the position of the pump displacement regulator. |
