Tipper vehicle e.g. roll-off tipper vehicle, has proportional valve provided as hydraulic control unit, and positioning device with control circuit to convert positioning error instructions into control power to adjust continuous valve

摘要

The vehicle has a hydraulic driven lifting device for raising and lowering a load transport container. A control device is provided for controlling hydraulic cylinders (28a, 28b) of the lifting device. A proportional valve or a servo valve is provided as a hydraulic control unit and a positioning device comprises of a control circuit for converting the positioning error instructions into a control power for adjusting the electro hydraulic continuous valve according to the measure of positioning sensor deflection.