An impedance control strategy based on firing-angle modification feedback is proposed,which compared with that based on impedance error modification feedback,avoids the firing-angle table search for each modification and speeds up the response of low-level control.

The quotation rule mapping between the quotation formula and the request-characteristic variable as well as the product module is obtained based on the feedback amendatory coefficient,and the quotation method based on feedback amendment for multi-specification and small-batch mechanical production is realized.

It gave three new standpoints about mechanism of explode in working face as follow: (1)The coal combustion is lead to explode by only fire souce; (2) The coal stacking combustion positive feedback is the main reason to lead to the coal combustion; (3)The firepresure is power souce formed explode condition.