To fulfil the requirements for a modern passenger car engine regarding fuel consumption and CO2 emission, there is increasing interest in cylinder deactivation solutions. Since especially CO2 reduction must happen soon, time to market is an important parameter for such systems. The possibility to apply cylinder deactivation into an existing series production engine without the need of significant design modifications appears to be the shortest way to the target. MAHLE and FEV commonly developed a cylinder deactivation system based on a widely used valve train design using a low-friction roller finger follower, which allows an application without significant impact on the cylinder head design. In this paper, the working principle of the switchable lever is presented and the various development stages from the idea up to the application in a complete engine are illustrated. The system was tested with regard to basic functionality and performance on a motored cylinder head with a tunnel camshaft design. In a second development step, the component was optimized with especial regard to installation space requirements, stiffness, and overall system costs. For current and future engine generations the cylinder deactivation system is an attractive and economically measure to address the demand for a further reduction of CO2 emission output.
A new cylinder deactivation by FEV and Mahle
Eine neue Zylinderdeaktivierung durch FEV und MAHLE
2008
7 Seiten, 10 Bilder, 7 Quellen
Aufsatz (Konferenz)
Englisch
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