PREVIEWING CONTROL SYSTEM OF AUTOMATIC HEIGHT ADJUSTMENT FOR COAL EXCAVATOR BASED ON MEMORY CUTTING

The parameters of coal excavator have great non-linearity (dead area, space and soon), time-variation and pure-delay time in the process of cutting along with the differences of traction speed, depth of cutting, and characteristics of coal and rock. In addition, the cutting curves cannot be any kind of form, because of restriction of hydraulic brackets. So the control system of stored memory cutting is developed based on the above- mentioned and the practical work model. The previewing control principal will be applied to the process of automatic height adjustment for the roller of coal excavator. Memory track will be fully utilized as previewing information. The complex control problem of will be solved radically. The control effect of simulation is better. Also performance index will arrive into optimization at the same time.