The operation process of single bucket hydraulic excavator is the process of multi-agency coordination. The driver should not only take care of the movement of the arm, bucket rod and bucket teeth, but also pay attention to the working state of the rotary, walking and engine. Because the single bucket hydraulic excavator needs more freedom to control and the driver has limited energy in operation, it often causes the driver to adjust the throttle of the engine according to the size of the load and make the throttle in a fixed position.
As a result, a large amount of energy loss and serious mechanical wear. To overcome this defect, the monitoring advantage of single chip microcomputer can be used to judge the working state of single bucket hydraulic excavator by using the pressure of hydraulic system as the judgment signal. According to the different state of the excavator, the throttle of the engine is controlled by stepping motor, which makes the engine stable in the required speed range, so as to achieve the purpose of energy saving.