The tuning of a small four-stroke spark ignition engine for flexible valve timings through numerical approach

Rosli, M. Haziq Adham; Hanipah, Mohd Razali; Kettner, Maurice

doi:10.1051/matecconf/201925504004

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…This shows that different intake valve timing gives different results in terms of engine performance. Valve timing adjustment, duration, lift or any of these could result in the improvement of the engine performance of the spark ignition engines [13].…”

Section: In-cylinder Pressurementioning

confidence: 99%

“…In addition, this paper by [12] states that a proper choice of valve timing will lead to substantial reductions in pumping losses during a component load operation. Then, the versatility of the valve timing, length, lift or combination of these may theoretically result in an improvement in the efficiency, fuel economy, and emissions of SI engines [13]. Dergisi [14] explained that controlling valve activities and timings allows the maximum possible loading of the cylinder at all engine speeds.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Valve Timing on in-Cylinder Pressure Spark Ignition Engines Performance Characteristics

Pahmi,

Mustaffa,

Basri

et al. 2023

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The performance of the engine depends on many factors. One of the factors is valve timing known to be the timing of opening and closing of valves that has a significant effect on the in-cylinder performance. However, there is less information in the study about valve timing effect on single cylinder engine performances. In this study, the focus is to analyze in-cylinder pressure characteristics on a single piston fuel injection for a spark-ignition engine. This can be done by simulating the effects of valve timing on in-cylinder pressure. The methodology of this project will be simulation-based by using commercial one-dimensional software. The research results are engine performance parameters which are volumetric efficiency, brake torque, brake power, and cylinder pressure in 1000 to 5500 RPM engines. The results show a positive increment in engine performance from the baseline model (CTA240) which is 9.06% for brake power, 2.85% for brake torque, and 13.09% for volumetric efficiency. At low engine speed, it was also found improvement in cylinder pressure when advancing the intake valve timing opening (IVO) by 20 to 25 degrees bTDC. For high speed, the cylinder pressure was found to improve once the retardation of intake valve timing closing (IVC) was done between 40 to 45 degrees aBDC by comparing it with the baseline results. The result highlights the importance of intake valve timing setup by varying the opening and closing of the intake valve to give better output for engine performance.

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Section: In-cylinder Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Valve Timing on in-Cylinder Pressure Spark Ignition Engines Performance Characteristics

Pahmi,

Mustaffa,

Basri

et al. 2023

View full text Add to dashboard Cite

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Computational Fluid Dynamics of Four Stroke In-Cylinder Charge Behavior at Distinct Valve Lift Opening Clearance in Spark Ignition Reciprocating Internal Combustion Renault Engine

Ikpe,

Bassey

2024

International Journal of Automotive Science and Technology

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In-cylinder flow dynamics in internal combustion Renault engine is complex, expensive and difficult to compute experimentally. The present study attempts to emulate the in-cylinder charge behaviour at distinct valve lift opening clearance in four stroke spark ignition internal combustion engine using computational fluid dynamics. Considering the complexity of the geometry and in-cylinder fluid motion, governing equations for unsteady, three dimensional, compressible turbulent flow were computed with continuity equations (conservation of mass), Navier-Stokes equations (conservation of momentum) and RNG k-ε turbulence model. Assumed to be an inline spark ignition (SI) operating on a four stroke cycle, the engine was modelled with SolidWorks 2019 version while the in-cylinder charge behaviour was simulated using ANSYS Fluent 14.5. Increase in cylinder temperature enhanced the thermal properties of air-fuel mixture during combustion. Increase in valve lift opening clearance led to more charge quantity being ingested through the intake valve opening into the cylinder, thereby causing increase in temperature of in-cylinder charge as well as significant improvement in the volumetric and mechanical efficiency of the cycle. It was also observed that the rate of heat retention in the cylinder may be optimum at lower valve lift which may be characterised by minor or zero loses, while significantly high cylinder charge temperature may be prone to reduction of the intake charge density. Based on Particle Image Velocimetry (PIV), in-cylinder velocity vectors, vorticity magnitudes and distributions of turbulence kinetic energy (TKE) increased with increasing valve lift opening clearance, thereby, improving combustion efficiency, increasing torque and power output for effective engine performance.

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Flexible valve timing strategies for boosting a small four-stroke spark ignition engine performance

Hanipah,

Rosli,

Razali

2020

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Variable valve timing (VVT) technology has been successful in enhancing internal combustion (IC) engine performance. VVT offers an additional control on engine breathing so that the engine operating conditions may be tailored more precisely hence, output and performance are amplified. In this paper, an approach of boosting IC engine performance through flexible valve timing (FVT) is presented. A numerical baseline model was developed using onedimensional numerical simulation tool based on a 65cc four-stroke gasoline engine. The flow coefficient values of intake and exhaust ports were obtained from flow bench experiments. The baseline model was validated against specification from manufacturer and results from previous research. This model undergone performance tuning to obtain the power and torque curves for the whole engine speed range. Next, performance optimization was conducted through design of experiments (DoE) with the target of boosting the torque and power of the baseline model between 5 to 10% for the engine speed from 1,500 until 6,000rpm. This was obtained through the variation of intake and exhaust valves timing as well as maximum lift using a full factorial experiment with three levels. The DoE experiments have identified several optimum FVT profiles. The result has shown an increase of up to 13% in brake power than the baseline. Volumetric efficiency is improved resulting in corresponding BMEP amplification. Finally, the potential of FVT system implementation is illustrated through laboratory prototype linear motor direct actuation system. The linear motor motion control preliminary testing has shown 4 to 11% difference between the demand and actual positions of the valve closing position. In conclusion, this study has shown high potential of FVT strategies which can improve engine performance over the whole range of engine speeds.</div></div>

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The tuning of a small four-stroke spark ignition engine for flexible valve timings through numerical approach

Cited by 3 publications

References 16 publications

The Influence of Valve Timing on in-Cylinder Pressure Spark Ignition Engines Performance Characteristics

The Influence of Valve Timing on in-Cylinder Pressure Spark Ignition Engines Performance Characteristics

Computational Fluid Dynamics of Four Stroke In-Cylinder Charge Behavior at Distinct Valve Lift Opening Clearance in Spark Ignition Reciprocating Internal Combustion Renault Engine

Flexible valve timing strategies for boosting a small four-stroke spark ignition engine performance

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