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推土机切土深度自动控制系统是根据发动机转速变化，利用单片机来控制铲刀液压缸升降，从而达到控制铲刀切土深度的目的。本文介绍了这种自动控制系统的工作原理及系统设计。
The automatic control system for the earth cutting depth of the bulldozer is based on the change of the engine speed, and the use of a single-chip microcomputer to control the elevation of the hydraulic cylinder of the blade to achieve the purpose of controlling the depth of the blade to cut the soil. This article describes the working principle and system design of this automatic control system.