Air taken into an internal combustion engine has to be cleaned to reduce wear. Besides the abrasive wear at piston-rings and cylinders there is a second indirect wear caused by particles following the blow-by gases to the crankcase. From there they are dispersed in oil and fed via the oilflow to cause wear in bearings all over the engine. The higher the compression the more blow-by occurs. That is the reason for different filtration media in Diesel and Otto applications. Diesel engines with their higher compressions need more efficient paper (MFP=21 microns), while Otto engines use long life papers (MFP=30 microns). Filter lifetime limiting factors are: Filter media (a more efficient filter has a shorter lifetime), filter dimension (the smaller the filter, the shorter the lifetime), dust particles (the finer the dust, the shorter the lifetime), and the media resistance (media and filter must not change their properties under the influence of different gases (e.g. ozone), humidity, vibration and pulsation, liquids and temperature). A formula for the calculation of filter lifetime is given. Data prove that it is possible to design air intake filters for a mileage of more than 60000 km. To avoid the risk of complaints from customers usually driving in dusty areas service indicators and precleaners have to be installed in cars.
Air intake filter to reach a lifetime of more than 60.000 km
Luftansaugfilter für Automobile mit einer Lebensdauer über 60000 km
1997
2 Seiten, 4 Bilder
Aufsatz (Konferenz)
Englisch
60.000-rpm milling readied for use
Tema Archiv | 1985
|IuD Bahn | 1999
|Unvoyage dans l'espace pour 60.000 F.
Online Contents | 1999
Dasertest - 60.000 Kilometer mit dem Renault Twingo Easy
Online Contents | 1997
Dauertest Mercedes C 180: Zwischenbilanz nach 60.000 km
Online Contents | 1995