A new hybrid concept (i-MoGen), combining a downsized, high specific output engine and mild hybrid system has been developed. This powertrain combination provides a significant improvement in fuel consumption whilst maintaining competitive performance levels. The key strategy with this system has been to minimise the battery size and power; electrical assistance is only used at low engine speeds and to improve transient response when required. Specifically, the practical implementation issues for a prototype vehicle, electrical and control systems, system costs and initial vehicle results are covered. Separating the 42 V electrical system into three voltage networks enabled conflicting requirements be accommodated (i.e. wide voltage range of FMED & NiMH battery combination, v stabilised supply of 42 V ancillaries). However, on a production vehicle programme this could be replaced with a dual voltage system, comprising just one 42 V network and one 14 V network, without loss of performance. The use of a supervisor controller enabled a real-time strategy to be developed that minimised electrical energy usage whilst maintaining vehicle systems integrity and performance. The mild hybrid approach adopted by i-MoGen incurs a significant on-cost, although the cost to benefit ratio is significantly better than more conventional hybrid systems currently in production. However, further cost reductions are required for widespread implementation of this technology.
Mild hybrid operation with a downsized diesel engine: a practical approach to outstanding fuel economy
2003
13 Seiten, 5 Bilder, 2 Tabellen, 8 Quellen
Article/Chapter (Book)
English
Batteriekapazität , Dieselmotor , Drehmomentenverlauf , Hybridtechnik , Implementierung , Kosten-Nutzen-Analyse , Kostenreduktion , Kraftfahrzeugelektrik , Kraftstoffeinsparung , Kraftstoffverbrauch , Nickel-Metallhydrid-Batterie , Niederdrehzahl , Prototyp , Realzeitbetrieb , Regelungssystem , Schaltautomat , Teillast , Übergangsfunktion , Spannungsniveau
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