It is proposed in this paper that a relay regulating loop be added in the hoist current signal of large power shovel so that rational coordination between hoist and crowd capacities can be obtained.

The new media adds an important income source for sports; the sports organization has created the large amount wealth for the sports by selling relay power, and so on.

Based on relay feedback self-tuning technology, self-tuning method of multivariable PID controller for coordinate control system of large scaled fossil-fired power unit is stated.