This paper takes the Huanghai-304 tractor-plowing set as example, applying the electro hydraulic proportion valve to replace the traditional hydraulic system as well as the sensor detection technology to collect real-time operating information, the closed loop control of hitch system which performs the plough resistance and position controlling is realized; and a control panel with.

In this paper, according to the statistical examination of the experimental data in field and laboratory test, the fundamental statistical properties of working load of engine in plowing and rototilling are summarized.

According to three parameter models, which are burthen rate of engine, slide rate of driving wheel and work resistance, this paper studyies the cultivating unit.