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In addition to standard air cleaners with or without cyclone separators, MAHLE also provides customer-specific air filter elements and air filter housings for passenger cars and commercial vehicles. Air filter elements of various types are used for filtering the intake air. Metal-free filter cartridges with efficient filter media and high dust holding capacity guarantee dust efficiency of up to 99.9 percent. Although cellulose media have predominantly been used for filtration in the past, MAHLE has meanwhile introduced new developments aimed at achieving higher efficiency and dust holding capacities. To this end, multi-layer filter materials made from cellulose, meltblown and nanofibers as well as completely synthetic non-woven materials have already been optimized for mass production.
New developments - air cleaners with activated carbon adsorbers
Owing to the statutory requirements of the North American market, HC adsorbers in the air intake are necessary for reducing emissions. In response to this, MAHLE has integrated an activated carbon element in its air cleaner modules. Hydrocarbons are therefore adsorbed which can then escape via the intake system when the engine is switched off.
Design air cleaners
The engine compartment of new vehicles is subject to increasing design requirements. MAHLE has therefore developed an engine-mounted air cleaner concept for the series production stage, which fulfills market-specific design requirements via different replaceable design elements based around a basic filter housing. The design of the upper shell is also determined by acoustic objectives. Several development stages ensure that the structure of the upper shell of the housing exhibits sufficient rigidity so that the radiated noise diverted from the air filter housing is not audible in the vehicle interior. The design was achieved through simulation using new numeric calculation methods.
