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Extra resources for 10th International Conference on Turbochargers and Turbocharging: 15-16 May 2012, Savoy Place, London

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Trapp, 2010, Zweistufige HochdruckTurboaufladung für Gasmotoren mit hohem Wirkungsgrad, 15. Aufladetechnische Konferenz, Dresden (D). (3) Codan, E. , Mathey, Ch. , 2009, Applications and Potentials of 2stage Turbocharging, 14. Aufladetechnische Konferenz, Dresden (D). , Mathey, Ch. , Gianoglio, M. , 2010, Combining dual stage turbocharging with extreme Miller timings to achieve NOx emissions reductions in marine diesel engines, 26th CIMAC World Congress in Bergen (N) (7) Watson, N. , 1982, Turbocharging the internal combustion engine, MacMillan Press Ltd.

This has the potential to allow additional spark advance in SI engines, reduced cooled EGR mass requirement and increased compression ratio, all contributing to improved powertrain efficiency. The improvement of engine efficiency is counteracted partially by increased engine throttling to maintain a given engine load; however, this has been shown to be a small effect in comparison to the pumping work benefit gained by the lower exhaust pressure. Figure 2 – Idealised part load in-cylinder pressure-volume diagram showing the primary and secondary gains ((1) and (2) respectively) of a Turbo-Discharging system Previous 1-D gas dynamic engine simulations (4) have indicated that lower exhaust pressure, reduced residual mass and increased turbocharging turbine expansion ratio allow higher peak engine torque than a conventional engine despite operating with reduced exhaust valve lift to achieve the alternating exhaust valve timings.

08 factor displacement, divided by heat 4 6 8 10 12 Pressure ratio πC* input per cycle. This time the pressure ratio has been varied under Fig. 10: Efficiency contributions following conditions: • IVC has been adapted to for a constant air fuel ratio • The start of injection has been adjusted for constant firing pressure • Valve overlap has been adapted for constant exhaust gas temperature • The temperatures of the intercooler and aftercooler have been adapted for a constant margin against water condensation • Turbocharging efficiency remains approximately constant at a level of 75%.

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