In terms of an effective CO2-reduction for the world wide pass car fleet, current hybrid vehicles must be counted as fig leafs as they are mainly available as upper or high class vehicles to ameliorate the high fuel consumption in that segment. In contrast to these concepts the boost recuperation system (BRS) approach to hybridization is a complementary one to the combustion engine, seeking the maximum benefit of electrification at very reasonable system add-on cost. The synergetic layout of the concept allows to provide a multitude of benefits across all vehicle segments: (1) CO2-benefits due to recuperation, Stop in Gear, additional Downsizing and Downspeeding and finally free choice of gears for manual transmissions range from 11% up to 14% in NEDC compared to a reference compact class vehicle with Start-Stop which already represents a good level of 140 g/km. (2) Additional CO2 benefits can be raised with Start/Stop Coasting. While regenerative braking and hybrid driving already amount to approx. 20 g/km in FTP72 (corresponding to a relative benefit of 15%, again based on the reference vehicle mentioned above), start/stop coasting further adds 14 g/km to fuel economy. In total, the BRS achieves ¾ of the benefit of a full hybrid system at significantly reduced system costs for electrification. (3) Comfort and performance features are the brilliant ICE start and stop performance, the torque assist and anti stall function. For manual transmission vehicles the Stop in Gear operation strategy allows to experience Start-Stop without change in driving habits. (4) The availability of electrical power on a higher voltage level even at low load driving cycles allows for further demand controlled electrical auxiliaries, while reducing cost in package and weight of the electrical system. (5) Finally the BRS opens a door to considerable reduction of gaseous emissions in the start or transient operation phase of the ICE. To put it in one very concise statement: BRS - an electrified powertrain at 48 V offers more than CO2 and comfort!
Electrified powertrain at 48 V - More than CO2 and comfort
2013
20 Seiten, 20 Bilder, 9 Quellen
Conference paper
English
Electrified powertrain at 48 V - more than CO2 and comfort
Automotive engineering | 2013
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