Performance Analysis and Improvement Approach of HEV Extended Expansion Gasoline Engine

According to the boost mathematical model verified by experiments, the valve train of traditional gasoline engine is optimized and improved to achieve extended expansion cycle. The simulation results of extended expansion gasoline engine shows that the extended expansion gasoline engine has a better economic performance, compared to traditional gasoline engines. The average brake special fuel consumption (BSFC) can reduce 22.78 g / kW•h by LIVC, but the negative impacts of extended expansion gasoline engine restrict the potential of extended expansion gasoline engine. This paper analyzes the extended expansion gasoline engine performance under the influence of LIVC, discusses the way to further improve extended expansion gasoline engine performance.

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Mode Strategy for Engine Efficiency Enhancement by Using a Magneto-Rheological Variable Valve Train

Journal of Energy Resources Technology ◽

10.1115/1.4048671 ◽

2020 ◽

Vol 143 (6) ◽

Author(s):

Yaojung Shiao ◽

Premkumar Gadde ◽

Mahendra Babu Kantipudi

Keyword(s):

Fuel Consumption ◽

Gasoline Engine ◽

Engine Performance ◽

Valve Train ◽

Valve Lift ◽

Dynamic Simulations ◽

Part Load ◽

Engine Efficiency ◽

Magneto Rheological ◽

Variable Valve

Abstract Variable valve timing (VVT) and variable valve lift (VVL) are two promising methods for improving gasoline engine performance. VVL improves part-load performance, and VVT reduces low-speed fuel consumption. Automobile industries and researchers have developed several mechanical, hydraulic, and electronic devices to implement these variable valve functions in engines. In this study, a control strategy is developed for a new compact and low-energy-consumption magneto-rheological valve train (MRVT) to effectively accomplish the variable valve functions and achieve superior engine performance. A non-throttle single-cylinder spark-ignition (SI) engine dynamic model is established to simulate the engine performance by using the flexibility of this new valve train. A six-mode strategy using VVT and VVL is proposed under different engine running conditions of speed and load. Dynamic simulations were conducted for investigating the six-mode strategy based engine performance. The results indicate that the combination of VVT and VVL in the corresponding engine mode can effectively give about 15–20% improvement in the brake fuel efficiency during low and medium speeds. Moreover, by using VVL, about 10–14% improvement in brake specific fuel consumption can be achieved at part-load conditions. According to this computational investigation, the overall engine efficiency and performance can be improved significantly by using a controllable magneto-rheological valve and strategically changing the engine VVL and VVT.

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THE STUDY OF THE EFFECT OF INTAKE VALVE TIMING ON ENGINE USING CYLINDER DEACTIVATION TECHNIQUE VIA SIMULATION

Jurnal Teknologi ◽

10.11113/jt.v77.6161 ◽

2015 ◽

Vol 77 (8) ◽

Author(s):

S. F. Zainal Abidin ◽

M. F. Muhamad Said ◽

Z. Abdul Latiff ◽

I. Zahari ◽

M. Said

Keyword(s):

Fuel Consumption ◽

Internal Combustion Engines ◽

Gasoline Engine ◽

Engine Performance ◽

Intake Valve ◽

Cylinder Deactivation ◽

Part Load ◽

Engine Model ◽

Engine Efficiency ◽

Load Conditions

There are many technologies that being developed to increase the efficiency of internal combustion engines as well as reducing their fuel consumption. In this paper, the main area of focus is on cylinder deactivation (CDA) technology. CDA is mostly being applied on multi cylinders engines. CDA has the advantage to improve fuel consumption by reducing pumping losses at part load engine conditions. Here, the application of CDA on 1.6L four cylinders gasoline engine is studied. One-dimensional (1D) engine modeling work is performed to investigate the effect of intake valve strategy on engine performance with CDA. 1D engine model is constructed based on the 1.6L actual engine geometries. The model is simulated at various engine speeds at full load conditions. The simulated results show that the constructed model is well correlated to measured data. This correlated model is then used to investigate the CDA application at part load conditions. Also, the effects on the in-cylinder combustion as well as pumping losses are presented. The study shows that the effect of intake valve strategy is very significant on engine performance. Pumping losses is found to be reduced, thus improve fuel consumption and engine efficiency.

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Gasoline engine valve train design evolution and the antiwear requirements of motor oils

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1243/1350650981542065 ◽

1998 ◽

Vol 212 (4) ◽

pp. 243-257 ◽

Cited By ~ 16

Author(s):

J. C. Bell

Keyword(s):

Gasoline Engine ◽

Control Valve ◽

Practical Experience ◽

Valve Train ◽

Gasoline Engines ◽

Design Evolution ◽

Strong Trend ◽

Wear And Friction ◽

Direct Acting ◽

Motor Oils

The ability of motor oils to control valve train wear adequately is ensured by the evaluation of new formulations in a variety of standard industry tests. The most critical of these tests have single-overhead-cam valve train systems with pivoted (rocker- or finger-type) followers. Although many vehicles in service have these types of valve train, there is a strong trend towards the use of roller-follower and direct-acting tappet (DAT) systems in recently introduced passenger car engine designs. Roller designs virtually eliminate sliding between the cam and follower and in gasoline engines reduce wear and friction to low levels. Practical experience indicates that DAT systems also give lower wear and friction than pivoted systems do. The parameters affecting wear in the pivoted-follower valve trains of the Sequence VE and Peugeot TU-3 tests are analysed in comparison with equivalent DAT systems. The friction and wear benefits observed with DAT systems are shown to be inherent in the geometry and kinematics of this type of valve train. The consequences of this finding are discussed in relation to the requirements for antiwear protection provided by future motor oils.

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Application of Over-Expansion Cycle to a Larger Gasoline Engine With Late-Closing of Intake Valves

Design, Application, Performance and Emissions of Modern Internal Combustion Engine Systems and Components ◽

10.1115/icef2002-484 ◽

2002 ◽

Author(s):

Seiichi Shiga ◽

Kenji Nishida ◽

Shizuo Yagi ◽

Youichi Miyashita ◽

Yoshiharu Yuzawa ◽

...

Keyword(s):

Compression Ratio ◽

Thermal Efficiency ◽

Gasoline Engine ◽

Engine Performance ◽

Mechanical Efficiency ◽

Expansion Ratio ◽

Brake Thermal Efficiency ◽

Gasoline Engines ◽

Cylinder Test ◽

Test Engine

This paper presents further investigation into the effect of over-expansion cycle with late-closing of intake valves on the engine performance in gasoline engines. A larger single-cylinder test engine with the stroke volume of 650 cc was used with four kinds of expansion ratio (geometrical compression ratio) from 10 to 25 and four sets of intake valve closure (I.V.C.) timings from 0 to 110 deg C.A. ABDC. Late-closing has an effect of decreasing the pumping work due to the reduction of intake vacuum, althogh higher expansion ratio increases the friction work due to the average cylinder pressure level. Combining the higher expansion ratio with the late-closing determines the mechanical efficiency on the basis of these two contrastive effects. The indicated thermal efficiency is mostly determined by the expansion ratio and little affected by the nominal compression ratio. The value of the indicated thermal efficiency reaches to 48% at most which is almost comparable with the value of diesel engines. The improvement of both indicated and brake thermal efficiency reaches to 16% which is much higher than ever reported by the authors. A simple thermodynamic calculation could successfully explain the behavior of the indicated thermal efficiency. The brake thermal efficiency could also be improved due to the increase in both mechanical and indicated efficiencies.

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One-Dimensional Simulation Using Port Water Injection for a Spark Ignition Engine

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.15.4.2018.7.0444 ◽

2018 ◽

Vol 15 (4) ◽

pp. 5803-5814 ◽

Cited By ~ 1

Author(s):

C. H. Ling ◽

M. A. Abas

Keyword(s):

Fuel Consumption ◽

Gasoline Engine ◽

Nox Reduction ◽

Water Injection ◽

Engine Performance ◽

Simulation Software ◽

Spark Ignition Engine ◽

Baseline Model ◽

One Dimensional ◽

Model Water

Water injection is a promising solution to reduce fuel consumption while improving the performance of a turbocharged gasoline engine. One-dimensional (1D) engine simulation software, AVL BOOST is rarely used to model water injection. Therefore, this study is aimed to demonstrate the detailed port water injection modelling via AVL BOOST. A four-cylinder turbocharged gasoline engine was developed in AVL BOOST based on the specification of the engine test rig and verified to be used as the baseline model. The port water injection modelling was then added to the baseline model. Water to fuel mass ratios of 0.05, 0.10, 0.15, 0.2 and 0.25 were chosen as the variables to investigate the effect of water injection on the engine performance. The results showed that maximum engine torque and IMEP increased by 10.80% and 8.65%, respectively at 3000 rpm. The water injection also reduced the in-cylinder pressure at the end of the compression stroke, reducing the compression work and improving efficiency. The reduction of combustion temperature also indicates potential for NOx reduction. The lower exhaust temperature can reduce the use of fuel enrichment which consequently reduces the fuel consumption. Conclusively, the water injection model can predict the engine performance parameters accurately.

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Investigation of the Gasoline Engine Performance and Emissions Working on Methanol-Gasoline Blends Using Engine Simulation

Numerical and Experimental Studies on Combustion Engines and Vehicles ◽

10.5772/intechopen.92858 ◽

2020 ◽

Author(s):

Simeon Iliev

Keyword(s):

Fuel Consumption ◽

Gasoline Engine ◽

Engine Performance ◽

Specific Fuel Consumption ◽

Injection System ◽

Si Engine ◽

Engine Simulation ◽

Fuel Blends ◽

Performance And Emissions ◽

The One

The aim of this study is to develop the one-dimensional model of a four-cylinder, four-stroke, multi-point injection system SI engine and a direct injection system SI engine for predicting the effect of various fuel types on engine performances, specific fuel consumption, and emissions. Commercial software AVL BOOST was used to examine the engine characteristics for different blends of methanol and gasoline (by volume: 5% methanol [M5], 10% methanol [M10], 20% methanol [M20], 30% methanol [M30], and 50% methanol [M50]). The methanol-gasoline fuel blend results were compared to those of net gasoline fuel. The obtained results show that when methanol-gasoline fuel blends were used, engine performance such as power and torque increases and the brake-specific fuel consumption increases with increasing methanol percentage in the blended fuel.

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A Review of the Applicability of Hydro Fuel to Improve the Engine Performance and Reduce Engine Emissions in Dual-Fuel Technology of Gasoline Engine

International Journal of Emerging Research in Management and Technology ◽

10.23956/ijermt.v7i3.7 ◽

2018 ◽

Vol 7 (3) ◽

pp. 14

Author(s):

Thanh Vo Xuan ◽

Dung Do Van ◽

Quoc Hoang An

Keyword(s):

Gasoline Engine ◽

Engine Performance ◽

Volume Ratio ◽

Intake Manifold ◽

Dual Fuel ◽

Hydrogen Fuel ◽

Engine Emissions ◽

Experimental Conditions ◽

Gasoline Engines ◽

Fuel Technology

Hydrogen fuel becomes an alternative fuel because of its advantage properties. Hydrogen fuel can be used in form of H2 or HHO. On the dual-fuel systems, hydrogen may be supplied to engines by injectors or by the differential pressure in the intake manifold. This paper presented the applicability of hydrogen on gasoline engines. The paper analyzed and evaluated the methods of hydrogen fuel applications, the results of the performance and engine emissions of the latest researches in over the world. The experiments were performed at hydrogen volume ratio from 1% to 4.5% and different experimental conditions. The experimental results were compared with only-gasoline engines. The combustion cylinders pressure is increased. The thermal efficiency is increased to 7%. The emission of HC and CO emissions are decreased significantly. NOx is reduced at learn conditions and increased at other conditions.

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An experimental study on fuel energy saving in gasoline engines using GNP as a lubricant additive

International Journal of Engine Research ◽

10.1177/14680874211039688 ◽

2021 ◽

pp. 146808742110396

Author(s):

Gurtej Singh ◽

Mohammad Farooq Wani ◽

Mohammad Marouf Wani

Keyword(s):

Piston Ring ◽

Energy Savings ◽

Gasoline Engine ◽

Engine Performance ◽

Mechanical Efficiency ◽

Lubricant Additive ◽

Lubricating Oil ◽

Engine Torque ◽

Gasoline Engines ◽

Improved Performance

This study concentrates on enhancing the performance of the gasoline engine through nano-lubrication. The effect of Graphene nano-platelets (GNP) as lubricant additives in SAE 15W40 oil on the fuel energy consumption and piston ring wear is investigated. GNP-filled lubricating oil boosted the brake strength, engine torque, and mechanical efficiency, whereas the gasoline engine’s brake specific fuel consumption (BSFC) decreased by 5.3%–6.5% due to a 1.7%–3.46% improvement in engine mechanical efficiency. Further, emission results showed that the GNP-filled lubricating oil reduced the emissions of the engine by approximately 3%–6% as compared to the virgin lubricating oil. Furthermore, the piston ring wear was found to reduce by using GNP-filled nano-lubricant. The characterization of the worn piston ring surfaces showed that the tribo-film formed on wear tracks resulted in the improved performance of the engine thereby reducing abrasive wear and surface roughness. From these studies, an attempt has been made to co-relate engine performance characteristics with tribological perception to contribute in the direction of energy savings and fuel economy.

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A Study of the Correlation between In-Cylinder Air Motion and Combustion in Gasoline Engines

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1243/pime_proc_1989_203_165_02 ◽

1989 ◽

Vol 203 (3) ◽

pp. 185-192 ◽

Cited By ~ 7

Author(s):

S C Kyriakides ◽

A R Glover

Keyword(s):

Combustion Chamber ◽

Turbulence Intensity ◽

Gasoline Engine ◽

Laser Doppler Anemometry ◽

Effective Means ◽

Engine Performance ◽

Performance Measurements ◽

Mean Velocity ◽

Gasoline Engines ◽

Air Motion

This paper describes an investigation into the effects of in-cylinder air motion at the spark plugs on gasoline engine performance. Measurements of combustion angles have been made in a single-cylinder four-stroke disc combustion chamber engine at part load and MBT ignition timing. Seventeen in-cylinder air motion regimes have been produced using masked valves. The air motion in each build has been evaluated by making laser Doppler anemometry (LDA) measurements of mean velocity and turbulence intensity at the spark plug position under motored conditions. It has been shown that there is a strong correlation between turbulence intensity and 10–90 per cent burn angle. It is demonstrated that for this combustion chamber geometry a tumbling air motion is a more effective means of generating turbulence at TDC than swirl.

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