Compared with the common L-shaped and V-shaped cylinder layouts, many friends may be unfamiliar with the triangular rotor engine. The rotary engine, also known as the Miller cycle engine, was invented by the German Fergus Wankel, which was later acquired by Mazda. We all know that the traditional cylinder reciprocating engine, in operation, the piston reciprocating linear motion in the cylinder, and in order to convert the linear motion of the piston into rotary motion, the crank linkage mechanism must be used. The rotor engine is different, it directly converts the combustion expansion force of the combustible gas into the driving torque. Compared with reciprocating engines, the rotor engine eliminates useless linear motion, so the same power rotor engine is smaller in size, lighter in weight, and has lower vibration and noise.