Innovative Exhaust Gas Recirculation system for economic and fuel efficient compliance of future emission standards

Authors

Dr.-Ing. Bernd Mahr, MAHLE GmbH, Stuttgart, Dr. sc. techn. Marco Warth, Dipl.-Ing. Jörg Rückauf, Dr.-Ing. Alfred Elsäßer, MAHLE International GmbH, Stuttgart

Year

2009

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 697

Summary

An innovative Exhaust Gas Recirculation (EGR) system is presented, which generates by means of a rotating flap temporary depressions wave balanced to each engine operating condition. This assures a sufficient pressure difference for EGR. By the integral control of the charge air and exhaust gas mass flow, the system provides the opportunity to both, increase the EGR rate and reduce the gas exchange work. Given the systems highly efficient and flexible electronic activation, the valves enable the desired exhaust gas flow rates both across the entire engine operating map and during engine cold starts. The importance of the cold start and engine warm up period increases significantly in terms of future emission standards.

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