Highlighted is the realization of the technical principle of fuel pre evaporation by utilizing the cold flame combustion phenomenon normally present prior to the ignition of liquid fuel.

Quasi homogeneous charge compression ignition (QHCCI) combustion may be with low emissions, especially for soot and NO_X, according as the most fuel which is pre-mixed is lean burnt.

This paper studied the models of pre-mixed spark ignition gas engine particularly, which adopted the method of mechanism analysis and system identification.