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279 - 2.0 110 kW Engine with Gasolina Direct Injection - Volkspage

279 - 2.0 110 kW Engine with Gasolina Direct Injection - Volkspage

Engine

Engine management Stratified charge operation To achieve a stratified charge, injection, combustion chamber geometry and incylinder flow must be optimally matched in addition to satisfying certain prerequisites. Namely: – Engine in corresponding load and enginespeed range – No system faults of relevance to emissions – Coolant temperature above 50 °C – Temperature of NO x storage catalytic converter between 250 °C and 500 °C – Intake-manifold flap closed 279_049 Intake-manifold flap Tumble plate Throttle valve In stratified charge operation, the intakemanifold flap completely closes off the lower intake port, thus causing the intake air mass to be accelerated and tumble via the upper intake port into the cylinder. High-pressure injector 279_024 18 The tumble effect is further enhanced by the bowl in the piston. At the same time, the throttle valve is opened wide to minimise throttle losses. 279_025

In the compression stroke, fuel is injected under high pressure (50-100 bar) into the area around the spark plugs just before the ignition point. 279_026 In view of the relatively shallow injection angle, the fuel spray scarcely comes into contact with the piston crown (so-called "aircontrolled" method). Fuel spray 279_027 A mixture with good ignition properties forms around the spark plugs and is ignited in the compression phase. In addition, a layer of air forms between the ignited mixture and the cylinder wall after combustion, thus providing insulation and reducing heat dissipation via the engine block. 279_028 19

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