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The conventional Diesel cycles engine is now approaching the practical limits of efficiency. The recuperated split cycle engine is an alternative cycle with the potential to achieve higher efficiencies than could be achieved using a conventional engine cycle. In a split cycle engine, the compression and combustion strokes are performed in separate chambers. This enables direct cooling of the compression cylinder reducing compression work, intra cycle heat recovery and low heat rejection expansion. Previously reported analysis has shown that brake efficiencies approaching 60% are attainable, representing a 33% improvement over current advanced heavy duty diesel engine. However, the achievement of complete, stable, compression ignited combustion has remained elusive to date.

SAE 2011 High Efficiency IC Engines Symposium - Session 4 - Novel Engine Components and Systems. Presenter Neville Jackson, Ricardo plc

There is much interest and debate on which advanced vehicle technologies will be common in the future. Public expectations seem to be running high with great promise of non-polluting, high efficiency vehicles. For the vehicles to reach high volume production though, the characteristics of these vehicles will need to meet customer demands for price, performance, driveability and comfort. The ideal propulsion system solution may well be different for the various vehicle applications (SUV, passenger car, city bus) as well as in different world markets. Currently there appears to be a significant divide between the benefits of hybrid vehicles and the incremental price consumers may be willing to pay. This raises the question as to what type of hybrids will be seen on the roads in the future. This paper reviews the future advanced vehicle concepts and focuses on the probable prime candidate for near term mass market - the mild hybrid.