Car engines generally obtain kinetic energy by burning gasoline (diesel) internally, so car engines are internal combustion engines.
● According to the different fuels used: it can be divided into gasoline engines and diesel engines. Compared with diesel engines, gasoline engines have their own characteristics; gasoline engines have high speed, low quality, low noise, easy starting, and low manufacturing costs; diesel engines have large compression ratios, high thermal efficiency, and much better emission performance and economic performance than gasoline engines.
● According to the movement mode of the piston: the piston type internal combustion engine can be divided into two types: reciprocating piston type and rotary piston type. The former piston performs reciprocating linear motion in the cylinder, while the latter piston performs rotary motion in the cylinder.
● According to the number of cylinders: it can be divided into single-cylinder engines and multi-cylinder engines. An engine with only one cylinder is called a single-cylinder engine; an engine with more than two cylinders is called a multi-cylinder engine. Modern car engines mostly use three-cylinder, four-cylinder, six-cylinder, and eight-cylinder engines.