The ''Stop-Start'' function can noticeably contribute to reducing the amount of air pollutants and CO2 emitted by automobiles. However conventional air conditioning is cut off when this function is activated, since it is based on a belt driven compressor. Standard driving cycle as well as statistics show that stops rarely exceed 1 minute. Despite this short duration, the cabin temperature may increase very quickly when the A/C stops. This occurs particularly when sunload is high. Three categories of technical solutions are described in this paper. They differ according to their storage mode : fuel, electricity or thermal. In terms of efficiency, an electrical compressor fed by a fuel-cell APU seems to be the most efficient, whereas driving the mechanical compressor by a 14V starter generator appears to be the least. Nevertheless, the first is not available and the latter proves to be satisfactory with a 42V electrical machine. Besides, thermal storage concepts reach high levels regarding overall efficiency. In terms of storage weight, fuel remains the best by far. Electrical storage in batteries involves significant weight increase. Thermal storage represents a good compromise between the two. Finally, thermal storage in latent form must be considered, all the more because it is adaptable to most innovative powertrains.
Air conditioning operation in stop-start mode
Klimaanalage im Startstop-Betrieb
2002
7 Seiten, 6 Bilder, 2 Tabellen, 11 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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