The reduction of charge air temperatures fundamentally produces advantages for the diesel engine. Under partial load, emissions were reduced, while under full load the effect can be used either to reduce fuel consumption for a constant power output, or the other way around to increase performance at a constant fuel consumption rate. In addition, the greater mass flow increases the charger speed and thus improves engine responsiveness. The advantages identified by MAHLE on the test bench must be classified according to their feasibility and the effort required. Assuming an initial basis of direct charge air cooling, converting to an indirect solution integrated in the air intake module provides tremendous potential due to the higher cooling capacity and the ability to regulate the cooling capacity. The pressure losses in the air path for this variant are also reduced significantly. Cascaded charge air cooling, also integrated in the air intake module, provides even greater increases in cooling capacity, in addition to full control flexibility. This approach is necessary if the heat dissipation of the low-temperature circuit is no longer sufficient. All of the advantages from the test bench measurements under full and partial load can also be implemented in the vehicle: the emission benefits under partial load can be obtained using a single-stage, conventional indirect, integrated charge air cooling, while the additional fuel consumption benefits under full load require the cascaded variant. This was confirmed by computation of vehicle circuits for all variants. In both cases, a prerequisite is a full-face low-temperature cooler at the front end. The capacity of the high-temperature cooler must be checked for cascaded charge air cooling. This power reserve was sufficient for the tested engine and compensated for the loading with cascaded charge air cooling, even under full load, without making changes to the cooler design An additional increase in the thermal load from parallel, full-load EGR requires that the high-temperature cooler is adjusted Condensate management can be handled by simple means due to the controllability in both variants Owing to the very good emission results under partial-load operation and fuel savings under full load, for diesel engines an increasing use ot indirect integrated charge air cooling as well as of the cascaded solution can be foreseen.


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    Titel :

    Cascaded indirect integrated charge air cooling for passenger car diesel engines


    Beteiligte:


    Erscheinungsdatum :

    2013


    Format / Umfang :

    13 Seiten, Bilder, 5 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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