| 摘要 |
An electro-hydraulic control device for power shift gearboxes, in particular in construction machinery, has switching elements (SE1, SE2, SE3) which can be actuated by a system pressure from an external pressurised medium source (1). Shift valves (SV1, SV2, SV3) are provided between the pressurised medium source (1) and the switching elements (SE1, SE2, SE3) and can each be actuated by a pilot pressure. Each of the switching elements (SE1, SE2, SE3) can be actuated in a defined switching state by at least two actuated shift valves (SV1, SV2, SV3) and at least one non-actuated shift valve. |
