Study on Miller Cycle Gas Engine for Co-generation Systems - Effect of Miller Cycle on the Performance of Gas Engine

Okamoto, Kazuhisa; Zhang, Furong; Shimogata, Satoshi; Shoji, Fujio; Kanesaka, Hiroshi

doi:10.4271/960949

Cited by 9 publications

(3 citation statements)

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“…*For correspondence Miller Cycle [15] which is now widely applied on the hybrid vehicles is a low-cost solution for improving the thermal efficiency of gasoline engines. In Miller Cycle intake valves close before or after bottom dead center, which makes the expansion ratio larger than the compression ratio (CR) which decreases the compression work due to the advancement of intake valve closing, thereby improving the thermal efficiency [16][17][18][19][20][21][22][23]. Endo [24] described the design of a commercially available large scale gas engine working on the Miller cycle and claiming an advantage of more than 5% over conventional technologies in terms of fuel efficiency.…”

Section: Introductionmentioning

confidence: 99%

The thermodynamic analysis of an electrically supercharged Miller Cycle gasoline engine with early intake valve closing

et al. 2019

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Electric superchargers are able to improve the thermodynamic process of gasoline engines by selfadapting running state to dominate intake air in all operation conditions. This paper proposes a novel approach for electrically supercharged Miller Cycle with early intake valve closing based on thermodynamics to settle the fuel economy problem of gasoline engines at low load operations by taking advantages of the domination of electric superchargers to intake air. Electrically supercharged Miller Cycle with early intake valve closing was realized by matching an electric supercharger, redesigning the inlet cam, and setting the intake valves closing before bottom dead center while keeping intake valves opening constant. An over-expanded engine cycle is attempted to be used to promote thermal efficiency by increasing geometric compression ratio, in addition to maintaining the effective compression ratio. Here, it has been attempted to systematically analyze the law of the energy losses of the electrically supercharged Miller Cycle gasoline engine with early intake valve closing using a reliable thermodynamic model from the perspective of heat engine. The results indicate that electrically supercharged Miller Cycle with early intake valve closing could improve the thermal efficiency of gasoline engines by significantly decreasing the pumping and exhaust losses.

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Section: Introductionmentioning

confidence: 99%

The thermodynamic analysis of an electrically supercharged Miller Cycle gasoline engine with early intake valve closing

et al. 2019

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“…Miklanek L [10] found that increasing the geometric compression ratio can compensate for the loss of EGR and increase the expansion ratio to compensate for the lack of dynamic performance and effectively improve the engine thermal efficiency. Okamoto [11]using LIVC and reducing combustion chamber volume increases geometric compression ratio, and increases the thermal efficiency of non-road natural gas engine by 4%.…”

Section: Introductionmentioning

confidence: 99%

Study on the Method of Improving Efficiency of Natural Gas Engine

Chen¹,

Zhang²,

Zhang³

et al. 2018

dtetr

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A one-dimensional thermodynamic simulation model was built based on the test data and using the system dynamics method to study the effects of geometric compression ratio, late intake valve closing (LIVC), air fuel ratio, exhaust gas recirculation (EGR) and ignition advance on the thermal efficiency of a straight line 6 cylinder miller cycle natural gas engine. The result shows that improve engine geometry compression ratio appropriately can effectively improve engine energy distribution, engine power and fuel economy. And compared with LIVC setting, ignition advance setting has a more obvious effect on engine performance. Proper ignition advance ensures high efficiency of the engine. Moderately increasing EGR rate can effectively guarantee the low NOx emission, and further increase LIVC can reduce exhaust gas dilution effect on inhibition of engine combustion rate, to ensure that the engine has good thermal efficiency. 1

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“…The Miller cycle is a cold cycle which has allowed in the past an increase in engine performance with an upraising of the knocking threshold. At this time, Miller cycle focused on improving the thermal efficiency of the engine [3][4][5][6][7][8][9]. As Miller cycle is a cold cycle, making use of this characteristic of Miller cycle to reduce the temperature at the end of compression and then to achieve lower temperature at the end of combustion may result in lower NO x emissions.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of applying miller cycle to reduce NO_x emission from diesel engine

Wang

Sheng-chuo

Huang

et al. 2005

Proceedings of the Institution of Mechanical Engineers, Part A:

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An experimental investigation of nitrogen oxides (NOx) emission reduction from a diesel engine using the Miller cycle was carried out. A Lister-Petter diesel engine, type TS2, was used for the experiments. Three versions of Miller cycles were designed and realized on a diesel engine. A series of tests were carried out on the test rig to compare the performances and emissions of the original engine (standard dual cycle) with those of the three versions of Miller cycles. The test results from the standard dual cycle and from the three versions of Miller cycles showed that applying Miller cycle to the diesel engine could reduce the NOx emission from the diesel engine. The reduction ratios of NOx for the Miller cycles are from 4.4 to 17.5 per cent. The best reduction effect is Miller cycle 1 and the reduction rates of NOx are from 11.0 to 17.5 per cent.

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Study on Miller Cycle Gas Engine for Co-generation Systems - Effect of Miller Cycle on the Performance of Gas Engine

Cited by 9 publications

References 0 publications

The thermodynamic analysis of an electrically supercharged Miller Cycle gasoline engine with early intake valve closing

The thermodynamic analysis of an electrically supercharged Miller Cycle gasoline engine with early intake valve closing

Study on the Method of Improving Efficiency of Natural Gas Engine

Experimental investigation of applying miller cycle to reduce NO_x emission from diesel engine

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Study on Miller Cycle Gas Engine for Co-generation Systems - Effect of Miller Cycle on the Performance of Gas Engine

Cited by 9 publications

References 0 publications

The thermodynamic analysis of an electrically supercharged Miller Cycle gasoline engine with early intake valve closing

The thermodynamic analysis of an electrically supercharged Miller Cycle gasoline engine with early intake valve closing

Study on the Method of Improving Efficiency of Natural Gas Engine

Experimental investigation of applying miller cycle to reduce NOx emission from diesel engine

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Experimental investigation of applying miller cycle to reduce NO_x emission from diesel engine