- 1 decade agoFavorite Answer
The function principle of the internal-combustion engine includes:
First, change the heat energy burnt into the mechanical energy.
Second, change sports of reciprocating (or turn round) of the piston into rotation sports of the bent axle.
Third, include entering circulation function that none of them can be dispensed with, such as angry, compressing, motive force, exhausting, etc. Among them the bent axle goes back to turn two circles the person who finishes circulation is called four journey engines; Turned around the person who finishes circulation by the axle and called two journey engines.Source(s): 乱掰ㄉ