2Miller Cycle Background The Miller cycle was patented by Ralph Miller, an American engineer, US patent dated Dec 24, 1957.The engine may be two stroke or four stroke and may be run on diesel fuel, gas fuel or dual fuel.Mazda is the only known manufacturer that successfully produced a Miller cycle engine from on a Mazda Millenia 2.3lts V6, and currently in Japan 1.3 lts Mazda 2.Other Manufactures such as Subaru are nowadays working on prototype engines(Subaru B5-THP).
3Miller Cycle Highlights Intake valves closing is delayed and part of the air goes back into the intake manifold.Expansion ratio is increased without increasing compression ratio by changing the shape of the piston.Excellent output power and specific power.Thermal Efficiency improves without risk of knocking, and pumping losses.Actual compression stroke occurs in the latter 70% to 80% of the compression strokeNOx reduction.
6Miller Cycle 0–1 is an isobaric process. 1–1 Intake blowback. 1a–2a is an isentropic compression process.2a–3a is an isochoric heating process.2a–3a-4a combustion and expansion process.3a-4a Isentropic expansion.4a-1 Constant volume heat rejection1-0 Constant pressure exhaust process
10REFERENCES1.-Dante Giacossa Endothermic Engines (Motori Endotermici), Imprenta Juvenil,S.A. –Maracaibo, Barcelona, Espaňa.2.-3.- Hatamura, K. and Hayakawa, M.: A study of theimprovement effect of Miller-cycle on mean effectivepressure limit for high-pressure superchargedgasoline engines, JSAE Review 18, 1997.4.-Sieber. H, Weisser U. Holrler H, and Boulouchos, K; resduction NOX emissions of DI Diesel Engine by Application of the Miller-System: An Experimental and Numkericla Investigation. SAE paper No , SAE Special publications, 1996 p Fukuzawa Y..Shimoda H, Kahuhama Y., Endo, H, and Tabaka, K, Development of high Efficiency Miller Cycle Gas Engine, Mitsubishi Heavy Industries, Ltd. Technical Review Vol. 38 No3(Oct. 2001). P6.- Anderson. M. Assanis D. and Filipi Z., First and Second Alw Analysis of a Naturally-Aspirated, Miller Cycle, SI engine with late intake Valve Closure, SAE Technical Paper Series , International Congress and Expositions Detroit Michigan February 23-26,1998, p.1-16.