Stephan Wild

Development of an Actuator for a Fast Moving Flap for Impulse Charging

An important development goal in motor engineering is the improvement of torque and responsiveness. MANN+HUMMEL is striving to achieve this goal by pursuing an innovative impulse charging concept that intensifies the gas dynamics processes at the charge cycle and allows an additional degree of freedom in the valve timing. A substantial increase can be achieved in the frequently used range from 1000 to 3000 rpm. The aim of the project is to develop a fast-moving flap for an intake manifold. In this project, the flap itself is being developed by MANN+HUMMEL together with an OEM, and an actuator is being developed by MANN+HUMMEL alone. The flap actuates in the same cycle as the intake valve. This results in a higher torque at lower rpm levels and no power loss at higher rpm levels. Possible applications are gasoline / diesel engines with / without superchargers, and Dl / MPI engines with an increase in torque or compensation for turbo lag. This presentation shows the development of the actuator, the requirements and first results achieved with an actuator prototype and a prototype flap.

Highly-variable intake systems

The demand for high engine torques over a wide range of engine speeds requires increased variability in the air intake systems of internal combustion engines. Modern naturally aspirated engines with a two-stage switched intake runner and variable camshaft adjustment represent a very cost-effective compromise, but will face competition in the future from intake systems with increased variability. Three-stage switched intake runners have been on the market for longer [1] and the first highly-variable intake system was only recently presented [2]. This paper by Mann+Hummel, Ludwigsburg, Germany, describes the basis for variable resonance runner adjustment for intake systems taking into account the thermodynamic aspects as well as those of production feasibility.

Neue Wege in der Kurbelgehäuseentlüftung

Die Abgasgesetzgebung ist derzeit Antrieb vieler Neuentwicklungen im Automobil. Die Erfullung zukunftiger Grenzwerte erfordert ein Bundel von Masnahmen am Gesamtsystem Verbrennungsmotor. Die Kurbelgehauseentluftung wurde im Entwicklungsablauf neuer Motoren fruher eher stiefmutterlich behandelt und wandelt sich jetzt zunehmend vom notwendigen ubel zum vollwertigen System im Verbund eines Emissionskonzepts. Der folgende Beitrag beschreibt den aktuellen Stand der Kurbelgehauseentluftungssysteme bei Mann+Hummel.

Secondary-air charger for reducing cold-start emissions

Legislation has promoted continuous further development of the emission standards of gasoline engines. At the same time, the automotive industry has made successful efforts to comply with these standards. For a number of years, secondary-air injection into the exhaust system has been used as an effective means of reducing cold-start emissions. Mann+Hummel has now developed a new principle for the injection of secondary air, the so-called secondary-air charger.

Sekundärluftlader zur Senkung der Kaltstartemissionen

Die Gesetzgebung hat eine kontinuierliche Weiterentwicklung der Emissionsstandards von Ottomotoren vorangetrieben. Parallel wurden von der Industrie erfolgreich Anstrengungen zur Einhaltung dieser Standards unternommen. Als wirksames Mittel, um beim Kaltstart die Emissionen zu senken, wird seit langem die Sekundarlufteinblasung in die Abgasanlage genutzt. Mann+Hummel hat ein neues Prinzip zur Einblasung von Sekundarluft entwickelt, den so genannten Sekundarluftlader.

New approaches to crankcase ventilation

Emission legislation is currently the driving force behind many new developments in automotive engineering. Compliance with future limits will call for a bundle of measures relating to the overall system “internal combustion engine”. Crankcase ventilation used to be seen as a necessary evil in the development of new engines but is now increasingly being treated with its due regard as a system within the overall emission concept. The following article describes the latest developments in crankcase ventilation systems at Mann+Hummel.