The engine hydraulic stepless speed regulation cooling fan changed the traditional drive type of the engine cooling fan.
发动机液压无级调速冷却风扇，改变了发动机冷却风扇的传统驱动方式。
The winch adopted valve-controlled proportional speed regulation hydraulic drive and PLC control to realize stepless speed change of the winch drum and coordinating control of the cable layer.
管线绞车采用阀控比例调速液压驱动、LC控制，实现了卷筒的无级变速和排缆器的协调控制。
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