Effect of Miller Cycle on Combustion and Emissions of Heavy Duty Diesel Engine
Effect of Miller cycle on engine performance,combustion and emissions on operating points of full load,emission control area and lower fuel consumption area were investigated in a common rail heavy duty diesel engine.The Miller cycle was achieved by delaying the intake valve close timing from the base engine to 30°,50° and 70° CA,respectively.Research results show that the application of Miller cycle can achieve lower fuel con-sumption at a lower peak combustion pressure.Under the same peak combustion pressure,the late intake valve close(LIVC)timing can reduce fuel consumption by 1 g/(kW·h).Under the same fuel consumption,the exhaust temperature can increase by 20℃when larger LIVC timing is used,benefit to exhaust thermal management.However,larger LIVC timing can cause power loss at high speed and full load operation,therefore a high effi-ciency turbocharger has to be used to ensure the global power output,reduce the fuel consumption and increase the exhaust temperature.
heavy duty diesel engineMiller cycleexhaust temperature
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