s work. Furthermore, the other assumptions inthe calculation model are: ?The ambient conditions: is298 K,,is1.005 kJ/kg K,is1.4. ?The pressor pressure and the downstream turbine pressure are 1 bar;therefore and represent also the values ofthe charge air pressure and ofthe exhaust backpressure, expressed inbar. ?pressor model isset before the intake pipe and the turbine ’smodel after the exhaust pipe nearby the regulating valve. The controls permit to find the engine set-up touse inthe test runs when the valve timing ismodified. Inparticular: othe SOI isadjusted tomatch the same engine power, since the same amount offuel isinjected; othe charge air pressure isadjusted toachieve the same air trapped mass; othe exhaust pressure ischanged tobalance the simulated TCalong the imposed efficiency.
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