The result of calculation indicates that 55% improvement of power can be achieved on full load by the Ultrahigh supercharged diesel engine PA6, which worked on Millercycle by means of integrated electronic control technology on fuel injection and gas exchange,and 3 MPa～4 MPa improvement of peak pressure can be.

In this paper,the core components of the main hoist GJH1-200/6 high-voltage vacuum commutator in the course of day-to-day work of the failure to carry out an analysis,summarize the main reason for failure and improve,using non-contact point contact,instead of contact point,to avoid contact with the occurrence of faults,fully improved production efficiency.