Thermodynamic consideration of the Miller cycle on the basis of simulation and measurements
With this paper an attempt was made to characterize the Miller cycle. Based on consideration of idealised processes, thermodynamic simulations and measurements it has been tried to reveal the fundamental aspects. Three different major features could be identified. Miller can be used for:
– Reduction of compression ratio
– Outsourcing of compression with improved charge air cooling
All other perceptions and aspects of Miller cycle can be ascribed to one of the above items.
Limits and benefits of Miller cycle thereby being a function of optimisation target. Possible targets are efficiency improvement, emission reduction, power increase and thermal management.
When applying supercharging to a Miller type engine it can be stated, that the turbochargers efficiency becomes more important compared to conventional engines, and the mechanical supercharging may be more efficient than turbocharging.
KeywordsCompression Ratio Thermodynamic Consideration Intake Valve Valve Lift Boost Pressure
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