What is the function of the exhaust stroke?

[LaLucy]

The function of the exhaust stroke is to expel exhaust gases. Below is a detailed introduction to four-stroke engines: 1. Classification: Four-stroke engines belong to reciprocating piston internal combustion engines. Based on the type of fuel used, they are divided into three categories: gasoline engines, diesel engines, and gas fuel engines. Piston internal combustion engines that use gasoline or diesel as fuel are called gasoline engines or diesel engines, respectively. Piston internal combustion engines that use natural gas, liquefied petroleum gas, and other gaseous fuels are called gas fuel engines. Both gasoline and diesel are petroleum products and are traditional fuels for automotive engines. Non-petroleum fuels are called alternative fuels. Engines that use alternative fuels are called alternative fuel engines, such as ethanol engines, hydrogen engines, methanol engines, etc. 2. Working process: A four-stroke gasoline engine completes one working cycle through four strokes: intake, compression, power, and exhaust. During this process, the piston moves up and down four times, and the corresponding crankshaft rotates two revolutions.