Issue 23

F Bucchi et alii, Frattura ed Integrità Strutturale, 23 (2013) 62-74; DOI: 10.3221/IGF-ESIS.23.07 72 ( a) ( b) Figure 15 : Power absorbed by current production, innovative vacuum pump and MR prototype during urban ( a) and extra-urban ( b) cycles. ( a) ( b) Figure 16 : Comparison between power absorbed by current production vacuum pump and integrated clutch-vacuum pump system. Tab. 3 summarizes the energy absorbed by the following systems, with reference to the elementary cycles taken as reference in the NEDC cycle: current production vacuum pump, innovative vacuum pump, current production vacuum pump coupled with the MR clutch, innovative vacuum pump coupled with the MR clutch. System Urban (kJ) Extra-urban (kJ) Total (kJ) Current Production VP 14.6 32.5 90.9 Innovative VP 9.5 20.9 58.9 Current Production VP + MR clutch 10.4 17.5 59.1 Innovative VP + MR clutch 8.2 16.2 49.0 Table 3 : Energy absorption during NEDC driving cycle The energy saved results significant due to both the innovative vacuum pump and to the use of MR clutch. In particular, Tab. 4 shows a comparison between the current production vacuum pump and the aforementioned innovative system. System Urban (%) Extra-urban (%) Total (%) Innovative VP 35.0 35.7 35.3 Current Production VP + MR clutch 28.8 46.1 35.1 Innovative VP + MR clutch 43.7 50.3 46.0 Table 4 : Energy absorption during NEDC driving cycle.