To prove that the simulation model can give the performance basis of CPICP and the contrast basis with other systems, the performance of the valve type orifice system of a confined piston internal combustion pump is experimentally studied.

The dynamic equation of valve type orifice system of confined piston internal combustion pump was built.

Aimed at the working principle of four cylinder four stroke swinging piston typed internal combustion engines,a kind of driving scheme of valve timing mechanism with 8 air valves driven by four cylindrical cams distributed in the circumference of a disk was introduced,and the mathematical model for the design and checking of cam contour line was presented.