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Proper maintenance can help vehicles perform as designed, positively affecting fuel economy, emissions, and the overall drivability. The results reveal rather low sensitivity of these modern diesel vehicles to air filter condition. The vehicles were powered by turbocharged diesel engines with different displacements and engine designs. The effects of clogged air filters on the fuel economy, acceleration, and emissions of three late model turbocharged diesel-powered vehicles were examined. Because modern diesel engines operate without throttling (or with minimal throttling), a different result could be anticipated. In contrast, a recent study showed that the fuel economy of modern gasoline vehicles is virtually unaffected by filter clogging due to the closed loop control and throttled operation of these engines. Older studies of carbureted gasoline vehicles have indicated that replacing a clogged or dirty air filter can improve vehicle fuel economy and, conversely, that a dirty air filter can be significantly detrimental to fuel economy. Described are measured results for increasing air filter pressure drop in turbocharged diesel-engine-powered vehicles, with primary focus on changes in vehicle fuel economy but also including emissions and performance. This paper addresses the issue of whether air filter replacement improves fuel economy. Proper maintenance can help vehicles perform as designed, positively affecting fuel economy, emissions, and overall driveability. The biggest differences were measured under extreme conditions when the air filter had been almost fully clogged, or the air had been delivered into the engine under pressure.
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The results from this article show a relatively low impact of air filter on the features studied. The importance of the article lies in quantification of the impact of clogged air filter on selected vehicle features. For higher result objectivity, the measurements haveīeen done under some extreme conditions as well, with both the air filter fully clogged and forced air induction. The measurements have been performed under laboratory conditions. The article pays attention to the impact of clogged air filter on selected vehicle characteristics including a vehicle’s dynamic features, fuel consumption and composition of the exhaust gases. It can further degrade the vehicle’s ability to accelerate and, therefore, have an impact on road driving safety, or it can eventually make a vehicle performance worse or cause a change in the exhaust gas composition. Thus, there is a conditionįor air mass delivered into the engine’s cylinders to be reduced. The residue that has settled in the collection cone can be emptied via the drain valve either when the machine is at a standstill or during filtration.While a vehicle is driving, the air filter is gradually being clogged. The patented filter cartridge bearing (AKF system) prevents high axial forces and facilitates the cleaning process.
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The particles or agglomerates are skimmed from the surface and settle in the collection cone. The special gap geometry of the filter cartridge guarantees efficient cleaning. The Filtration Group filter cartridge is rotated against a spring actuated scraper for this purpose. The filter is cleaned either when a preset differential pressure limit is reached or after a specified cycle time elapses. In the AF 93 G version, the tangential flow around the tube of the integrated preseparator relieves the load on the filter cartridge from coarse and heavy particles. The filtered fluid exits the filter housing at the top opposite the inlet connection. The solids are separated on the surface of the triangular filter cartridge wires. It flows inward through the Filtration Group filter cartridge. The medium to be cleaned is guided into the filter housing under pressure or in suction mode. The concentrated solids are drained off simply by opening the system for a short time. The filter is cleaned either automatically or semi-automatically without interrupting operation. This compact, inline filter system consumes no filter material, which means there is also no need for subsequent disposal. The Filtration Group metal-edge filter system is used to filter and homogenise a wide range of liquids and pastes. The Filtration Group AF 73 G and AF 93 G metal-edge filters belong to the small Vario series.