A new generation of Turbochargers for gasoline engines for high pulsation requirements for Wastegate control

摘要

A new family of gasoline engine Turbochargers has been developed with a focus on high performance and excellent NVH characteristics especially in relation to the Wastegate control system: Challenging requirements and boundary conditions such as: Integrated Exhaust Manifold (IEM), Monoand Twinscroll T/C and NVH-and gas sealing performance, lead to the search for a better and more robust wastegate system. In this search, we have introduced new simulation methods and non-contact measurement and visualisation techniques which resulted in dramatically reduced development time. The improved wastegate system is particularly important for twinscroll Turbochargers of 4- and 6- cylinder engines, 3-cylinder engines and engines with cylinder head integrated exhaust manifolds (IEM). Using the latest CAE and newly developed dedicated testing tools enabled us to create the required solution, that has been validated in close cooperation with global customers.