BMW 工藝 - VANOS 可變汽門正時機構

[Anakus]

VANOS operates on the intake camshaft in accordance with engine speed and accelerator pedal position. At the lower end of the engine-speed scale, the intake valves are opened later, which improves idling quality and smoothness. At moderate engine speeds, the intake valves open much earlier, which boosts torque and permits exhaust gas re-circulation inside the combustion chambers, reducing fuel consumption and exhaust emissions. Finally, at high engine speeds, intake valve opening is once again delayed, so that full power can be developed.
VANOS 運作進氣凸輪軸乃是依據引擎速率與油門踏板位置所決定，
低速時...進氣門較晚打開，以增進低速品質與行車流暢性。
中速時...進氣門大幅提早，加速扭力湧出並容許與廢氣於燃燒室內混合以降低燃料消耗及排氣。
高速時...進氣門又再回復延緩，以便輸出全部動力。