What kind of engine is Mercedes-Benz glk300?

M272 948 series naturally aspirated engine

Natural inhalation (English: Normally inhalation) is a kind of automobile air intake, which is a form of atmospheric pressure forcing air into the combustion chamber without any supercharger. Naturally aspirated type has no supercharger, that is to say, air simply passes through the air filter-throttle valve (commonly known as "throttle valve")-intake manifold to reach the "cylinder", and gasoline is directly injected into the intake manifold through the fuel injector (usually EFI, and now the latest technology is in-cylinder injection, which stands for Volkswagen Magotan).

principle of operation

Take a four-cylinder engine as an example, the piston does work with four strokes: downward (the intake valve is open, there is a pressure difference, and the mixture of air and fuel enters the cylinder under the action of the pressure difference)-upward (the intake valve is closed, the mixture is compressed, and the piston is ignited when it reaches the highest point)-downward (the mixture burns and expands, pushing the piston to do work and output power)-upward (the exhaust valve is opened, and the piston is exhausted).