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.
关键词
重型柴油机/米勒循环/排气温度
Key words
heavy duty diesel engine/Miller cycle/exhaust temperature
维普
万方数据