For efficient and clean fuel combustion, the fuel mass injected must always be precisely matched to the air mass entering the engine cylinder.
With the help of mass air flow sensor, the electronic engine control registers the exact air mass entering the combustion chamber. By means of corresponding control interventions it matches exhaust-gas recirculation and the fuel mass injected in such a way that engine running is always economical, clean and powerful.
The turbocharger raises the air pressure and thus increases the air mass in the cylinder.
Exhaust-gas recirculation, which mixes a defined amount of exhaust gas with the air via the exhaust-gas recirculation valve, reduces the share of oxygen in the cylinder. This reduces the combustion temperature so that fewer nitrogen oxides are generated.
