Orifice flap for intake systems at limited installation space

Abstract

In contemporary engines, turbocharging increases air mass flow, which, in turn, requires a larger intake pipe cross-section to reduce pressure drop. However, a larger cross-section results in higher intake noise, which must be reduced using a comparatively large volume bypass resonator. Since the necessary installation space can hardly be found in downsized engines with start-stop systems, innovative technical solutions should be thought. And exactly this is where the orifice flap design developed by Mann+Hummel can be used. This paper describes this innovative flap as a solution of the conflict between pressure drop and intake noise in vehicles.