Semi-active Intake Structure Design and Vehicle Validation

摘要

A development idea of dual-mode intake system is proposed and a passive flapper intake valve is designed in this paper. The GT-Power model of intake structure is established, the effect law of valve switch and opening angle on 2nd order intake noise is researched through simulation and test. The dynamic model of passive flapper valve is established by ADAMS software, which analyzes the matching relationship among spring stiffness, valve opening rotation rate and valve opening angle. The test results show that the intake noise and engine power loss are reduced effectively, and vehicle ride comfort and NVH quality are also improved obviously, when the intake valve is opened automatic at 3100 engine speed.