The new Fuel Stratified Injection technique, which can be translated into Russian as «gasoline direct injection with stratified charge», works with a powerful intake system. The oxygen intake volume is analyzed by a hot-wire air mass meter. The electronic accelerator pedal controls the water-heated throttle. Before air enters the intake pipe collector, and depending on the engine operating mode, the return of exhaust gases to the combustion chamber reaches 35 percent. Exhaust gases are taken from the exhaust port of the fourth cylinder.
The new design of the exhaust gas recirculation valve is responsible for regulating this process. Due to the return of exhaust gases to the combustion chamber, the content of nitrogen oxides is significantly reduced immediately after the engine. This effect is supported by variable adjustment of the intake camshaft.
An important detail of the intake tract is the new multifunctional module. This module includes a high-pressure fuel distributor, special butterfly valves, a mechanical or sensor control device for the separate control of the two FSI-specific phases (layered charge mode and homogeneous mode), as well as a pressure sensor together with a control valve. Without the multifunctional module, neither the over 100 bar pressure generated by the common rail fuel injection system, nor the transition from economical stratified charge to homogeneous mode would be possible.
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