pistonmoottorilla

Pistonmoottori, commonly known as an internal combustion engine, is a heat engine that converts chemical energy stored in fuel into mechanical energy. This is achieved through a controlled explosion of fuel-air mixture within a confined space called a cylinder. The expanding gases from this combustion push a piston downwards, which in turn rotates a crankshaft. This rotational motion is the mechanical energy that can be used to power vehicles, machinery, and other applications.

The fundamental operation of a pistonmoottori typically involves a four-stroke cycle: intake, compression, combustion (power), and exhaust. During the intake stroke, the piston moves down, drawing a mixture of fuel and air into the cylinder. The intake valve then closes, and the piston moves up during the compression stroke, squeezing the fuel-air mixture. At the top of the compression stroke, a spark plug ignites the mixture, causing the combustion or power stroke. The resulting explosion forces the piston down. Finally, during the exhaust stroke, the piston moves up again, pushing the burnt gases out of the cylinder through an exhaust valve.

Pistonmoottorit can be fueled by various substances, including gasoline, diesel, natural gas, and even hydrogen. They are categorized by their number of cylinders, arrangement of cylinders (e.g., inline, V-shaped, boxer), and their operating cycle (two-stroke or four-stroke). Despite the advent of electric powertrains, pistonmoottorit remain a dominant technology in many sectors due to their relatively low cost, high power density, and the established infrastructure for fuel distribution. Continuous advancements aim to improve their efficiency and reduce emissions.