Optimization of Fuel Consumption of a SI Engine Using Variable Valve Timing and Variable Length Intake Manifold Techniques

According to the world crisis about fuel consumption and environmental concerns regarding toxic emissions of internal combustion engines, the engines with higher efficiency and lower fuel consumption have been a topic of research in last decades. In this study, variable valve timing (VVT) and variable length intake manifold (VLIM) techniques are used to optimize the fuel consumption of an SI engine. At first, all components of engine are modeled in GT-POWER and a comparison with experimental results is performed to confirm the accuracy of the model. Then, the discrete-gird algorithm is employed to optimize the parameters in GT-POWER. The results obtained indicate that optimal valve timing and intake manifold length significantly reduces brake specific fuel consumption (BSFC).

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Variable Valve Timing (VVT) Modelling by Lotus Engine Simulation Software

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.17.4.2020.15.0635 ◽

2021 ◽

Vol 17 (4) ◽

Author(s):

Mohammed Kadhim Allawi ◽

Mohanad Kadhim Mejbel ◽

Mahmood Hasan Oudah

Keyword(s):

Fuel Consumption ◽

Internal Combustion Engines ◽

Simulation Software ◽

Valve Lift ◽

Variable Valve Timing ◽

Valve Timing ◽

Engine Simulation ◽

Engineering Software ◽

And Performance ◽

Variable Valve

Variable valve timing (VVT) is an advanced modern technique applied in internal combustion engines by altering the valve lift event timing. This work aims to contribute to the continuing industrial VVT development to improve engine efficiency, fuel consumption and performance. To observe the influence on the spark-ignition (SI) engine’s performance, four valve timing strategies are selected carefully by varying the intake and exhaust valve timing. Lotus Engine Simulation, a simulation engineering software, is adapted in this study. The engine characteristics used in this modelling are spark engine, multicylinder, four strokes, port injection fuel system and constant compression ratio. A comparison between a conventional standard exhaust/intake valve timing and three other different timing cases is carried out. Results reveal that the overlap case of 98° showed a good brake-specific fuel consumption by approximately 3% less than the conventional case. An improvement of 6.2% for volume efficiency and 2.9% in brake thermal efficiency is also reported.

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Using the 2nd Law of Thermodynamics to Optimize Variable Valve Timing for Maximizing Torque in a Throttled SI Engine

10.4271/1999-01-0328 ◽

1999 ◽

Cited By ~ 10

Author(s):

T. Kohany ◽

E. Sher

Keyword(s):

Variable Valve Timing ◽

Valve Timing ◽

Si Engine ◽

Variable Valve

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Variable Valve Timing Implemented with a Secondary Valve on a Four Cylinder SI Engine

10.4271/970335 ◽

1997 ◽

Cited By ~ 7

Author(s):

Olivier Vogel ◽

Kimon Roussopoulos ◽

Lino Guzzella ◽

James Czekaj

Keyword(s):

Variable Valve Timing ◽

Valve Timing ◽

Si Engine ◽

Variable Valve

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Effects of Combustion Phasing, Injection Timing, Relative Air-Fuel Ratio and Variable Valve Timing on SI Engine Performance and Emissions using 2,5-Dimethylfuran

SAE International Journal of Fuels and Lubricants ◽

10.4271/2012-01-1285 ◽

2012 ◽

Vol 5 (2) ◽

pp. 855-866 ◽

Cited By ~ 24

Author(s):

Ritchie Daniel ◽

Chongming Wang ◽

Hongming Xu ◽

Guohong Tian

Keyword(s):

Engine Performance ◽

Injection Timing ◽

Variable Valve Timing ◽

Valve Timing ◽

Si Engine ◽

Fuel Ratio ◽

Performance And Emissions ◽

Variable Valve ◽

Engine Performance And Emissions

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The Synthesis and Analysis of Variable-Valve-Timing Mechanisms for Internal-Combustion Engines

10.4271/880387 ◽

1988 ◽

Cited By ~ 10

Author(s):

F. Freudenstein ◽

E.R. Maki ◽

Lung-Wen Tsai

Keyword(s):

Internal Combustion Engines ◽

Internal Combustion ◽

Variable Valve Timing ◽

Combustion Engines ◽

Valve Timing ◽

Timing Mechanisms ◽

Variable Valve

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Combustion phasing model for control of a gasoline-ethanol fueled SI engine with variable valve timing

2012 American Control Conference (ACC) ◽

10.1109/acc.2012.6314779 ◽

2012 ◽

Cited By ~ 6

Author(s):

C. M. Hall ◽

G. M. Shaver ◽

J. Chauvin ◽

N. Petit

Keyword(s):

Variable Valve Timing ◽

Valve Timing ◽

Si Engine ◽

Variable Valve

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Computational studies of the influence of variable valve timing on the performance of a gas engine with Miller’s thermodynamic cycle

Journal of Physics Conference Series ◽

10.1088/1742-6596/2061/1/012066 ◽

2021 ◽

Vol 2061 (1) ◽

pp. 012066

Author(s):

K V Milov

Keyword(s):

Internal Combustion Engines ◽

Computer Modelling ◽

Thermodynamic Cycle ◽

Valve Lift ◽

Variable Valve Timing ◽

Miller Cycle ◽

Valve Timing ◽

Gas Engine ◽

Lift Height ◽

Variable Valve

Abstract Current development trends in the field of internal combustion engines aim at regulating all processes of the engine and individual units. A converted diesel to gas engine with Miller thermodynamic cycle is more energy efficient at partial loads than a gas engine with Otto thermodynamic cycle. The Miller cycle engine with variable valve timing and valve lift has been investigated to improve performance and energy efficiency across the load range. The aim of the work is to study the influence of the displacement of the valve timing phases of the intake and exhaust camshafts and the valve lift height on the performance of the gas engine with the Miller cycle. Computer modelling was based on data obtained from the full-scale experiment on the gas engine with the Miller thermodynamic cycle.

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