Investigation of Early and Late Intake Valve Closure Strategies for Load Control in a Spark Ignition Ethanol Engine

Lanzanova, Thompson; Nora, Macklini Dalla; Zhao, Hua

doi:10.4271/2017-01-0643

Cited by 20 publications

(11 citation statements)

References 32 publications

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“…The maximum valve lift was controlled at 3.0 mm for both intake and exhaust valves during the whole set of tests. The effects of low valve lift on EIVC load control was previously investigated in the same engine [53]. Lower valve lifts would increase pumping losses and required longer intake durations to keep a constant load.…”

Section: Test Proceduresmentioning

confidence: 99%

“…Figure 5 presents the gas exchange parameters at different residual gas fractions and fuels. Considering a polytrophic compression process and a given intake pressure [56], [57] , the use of a constant intake valve closing (IVC) resulted in an effective compression ratio of 10.8. In addition, the fixed exhaust valve opening (EVO) yielded the same effective expansion ratio for all cases.…”

Section: Validation Of the 1d Engine Modelmentioning

confidence: 99%

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The effects of residual gas trapping on part load performance and emissions of a spark ignition direct injection engine fuelled with wet ethanol

et al. 2019

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Section: Test Proceduresmentioning

confidence: 99%

Section: Validation Of the 1d Engine Modelmentioning

confidence: 99%

The effects of residual gas trapping on part load performance and emissions of a spark ignition direct injection engine fuelled with wet ethanol

et al. 2019

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“…Different experimental and numerical literature works discuss the main benefits of innovative valve strategies for spark ignition engines. 7–15…”

Section: Introductionmentioning

confidence: 99%

Optimization via genetic algorithm of a variable-valve-actuation spark-ignition engine based on the integration between 1D/3D simulation codes and optimizer

Teodosio

Berni

2022

International Journal of Engine Research

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In this work, a turbocharged spark ignition engine equipped with a variable valve actuation device is investigated to numerically optimize the Brake specific fuel consumption (BSFC) at different loads and speeds by employing a genetic algorithm. The engine is preliminary analyzed at the test bench under both part and full load operations and different valve strategies. A system schematization is realized in a 1D code. The developed model is integrated with user-defined sub-models for the description of the in-cylinder processes, and then is validated over the measurements. A 3D CFD model of a single cylinder is developed in a commercial code and validated against experimental mean in-cylinder pressure and combustion indicators. The validated 1D engine model is coupled to an external optimizer, to identify the optimal calibration, performing multi-variable and multi-objective optimizations with the adoption of the MOGA genetic algorithm. The latter aims at minimizing the BSFC in a BMEP sweep, at fixed speed, while controlling the load through the Inlet Valve Closure (IVC) at fully opened throttle valve. The optimization results show that an advanced control of the intake valve strategy allows a maximum BSFC advantage of 26% at medium/high loads and medium speeds, if compared to the manufacturer-advised engine calibration. The outcomes of the optimization process are also confirmed by the 3D CFD tool. The latter not only contributes to the tuning of the 1D model, but it also provides an in-depth on detailed 3D aspects, such as turbulence and knock, that could not be assessed via a simplified 1D approach. The presented methodology represents a valuable tool to refine the virtual calibration of VVA engines and to support the design phase, thus remarkably reducing the experimental efforts. Moreover, it is a promising example of integration between 1D and 3D CFD tools.

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“…[17]. Compared to gasoline has higher octane number and greater latent heat of vaporization, which lead to knock resistance and charge cooling effect, respectively [18]. These characteristics are suitable with DI turbocharged engine, which enables increased compression ratio [19].…”

Section: Introductionmentioning

confidence: 99%

Efeitos da Variação dos Eventos de Válvulas na Combustão, Desempenho e Emissões de um Motor de Ignição por Centelha operando em Carga Parcial com Etanol

Golke¹,

Rohrig²,

Prante³

et al. 2021

Blucher Engineering Proceedings

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The stricter legislation on pollutant emissions and the demand for less CO2 per km has been driven the industry on a pursuit trade off in internal combustion engines (ICE). Urban area frequently stands for engine part load operation. For this reason, high engine performance on this map region is essential to mitigate greenhouse gas emission and improve urban air quality. However, spark ignition engine efficiency is worsened by load control method in part load that increase the pumping loses. Therefore, the present work investigated the effects on combustion, performance and emissions by varying the intake and exhaust valve timings. The tests were carried out in a three-cylinder 1.0 l engine with direct injection system. The engine was fueled with hydrous ethanol and the tests were performed at 4 and 8 bar IMEP, 1500 rpm and stoichiometric lambda. The valve timing setting was from a locked position of 5 CAD of NVO to 85 CAD of PVO. The spark timing was adjusted to maintain the CA50 at 10 CAD aTDCf. The injection timing and pressure were kept at 30 CAD aTDCi and 100 bar. The COVIMEP was limited at 3%. The results showed slightly increase in engine efficiency and decrease of NOX emission with higher positive valve overlap.

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Investigation of Early and Late Intake Valve Closure Strategies for Load Control in a Spark Ignition Ethanol Engine

Cited by 20 publications

References 32 publications

The effects of residual gas trapping on part load performance and emissions of a spark ignition direct injection engine fuelled with wet ethanol

The effects of residual gas trapping on part load performance and emissions of a spark ignition direct injection engine fuelled with wet ethanol

Optimization via genetic algorithm of a variable-valve-actuation spark-ignition engine based on the integration between 1D/3D simulation codes and optimizer

Efeitos da Variação dos Eventos de Válvulas na Combustão, Desempenho e Emissões de um Motor de Ignição por Centelha operando em Carga Parcial com Etanol

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