Neue Generationen von Ottomotoren – Von „Smart Simplicity“ bis hin zu effizienten Fahrspaßkonzepten für höchste Ansprüche

Authors

Dr. Günter, K. Fraidl, Dr. Paul E. Kapus, Dr. Hubert Friedl, AVL-List GmbH

Year

2006

Summary

With a high number of different technologies, the Gasoline engine is serving a wide market range – from cheap standard engines up to complex high performance variants. With small displacement engines, the combination of cam phaser plus variable charge motion is the most attractive fuel efficient technology. By asymmetric exhaust valve lift and respective port design, the functionality of variable charge motion can be integrated into the EGR introduction itself. Thus additional swirl or tumble flaps can be avoided not only reducing parts, calibration and diagnostics efforts, but also enhancing the system robustness. With the larger Gasoline engines which are more dedicated also towards high fun to drive, the introduction of GDI - especially in combination with turbocharging - represents a significant milestone. This combination does not only enable the development of ultra-high performance concepts (BMEP even larger than 30 bar and specific power up to 150 kW), but also provides cost effective downsizing / down-speeding concepts which offer both fuel economy improvement and increased fun to drive. Such concepts leverage the typical benefits of Diesel engines (high fuel economy and low end torque) and Gasoline engines (smooth NVH, broad speed range, low cost), thus becoming an essential competitor to the successful Diesel engine. For both applications mentioned, an intelligent system simplification, of course, at quite different levels of complexity is the key success factor.

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