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Статті в журналах з теми "VVA-Variable Valve Actuation"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Jin, Zhaohui, Wei Hong, Tian You, Yan Su, Xiaoping Li, and Fangxi Xie. "Effect of Multi-Factor Coupling on the Movement Characteristics of the Hydraulic Variable Valve Actuation." Energies 13, no. 11 (2020): 2870. http://dx.doi.org/10.3390/en13112870.

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Анотація:

Studies show that the valve lift (VL) of the cam-driven hydraulic variable valve actuation (VVA) can be continuously adjusted in the range of 0–8.2 mm by controlling the opening of the throttling valve. In the present study, an orthogonal experiment with interaction was designed to analyze the effect of multi-factor coupling on the VL, valve-seating velocity (VSV), and pressure fluctuation in the valve piston cavity. In order to reduce the pressure fluctuation, the Taguchi method was applied to find the optimal combination of the key parameters including the diameter of the piston, the spring

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2

Megha, A. Mohite* Santosh B. Trimbake Vinay B. Ugale. "FEA BASED NUMERICAL MODELLING OF CONTINUOUS VARIABLE VALVE LIFT MECHANISM FOR SINGLE CYLINDER SI ENGINE." Global Journal of Engineering Science and Research Management 4, no. 10 (2017): 88–97. https://doi.org/10.5281/zenodo.1034493.

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Анотація:

Recently Variable Valve Actuation (VVA) systems are being extensively used in internal combustion engine. In such mechanism, cams and valves are connected via intermediate lever, which allows different maximum valve lifts and duration using same cam profile. Recently, novel valve actuation mechanism like Continuous Variable Valve Lift (CVVL) is being explored to regulate engine output without conventional throttle valve and this reduces the pumping losses especially at part load in SI engines. CVVL mechanism with three elements consists of eccentric shaft, Intermediate lever and Rocker arm, wh

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3

Shaver, G. M., M. J. Roelle, P. A. Caton, et al. "A physics-based approach to the control of homogeneous charge compression ignition engines with variable valve actuation." International Journal of Engine Research 6, no. 4 (2005): 361–75. http://dx.doi.org/10.1243/146808705x30512.

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Homogeneous charge compression ignition (HCCI) is a promising low-temperature combustion strategy for reducing NOx emissions and increasing efficiency in internal combustion engines. However, HCCI has no direct combustion initiator and, when achieved by reinducting or trapping residual exhaust gas with a variable valve actuation (VVA) system, becomes a dynamic process as the temperature of the residual gas couples one cycle to the next. These characteristics of residual-affected HCCI present a challenge for control engineers and a barrier to implementing HCCI in a production engine. In order t

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4

Han, Linghai, Jiaquan Duan, Dingchao Qian, et al. "Research on Homogeneous Charge Compression Ignition Combustion of Intake Port Exhaust Gas Recirculation Based on Cam Drive Hydraulic Variable Valve Actuation Mechanism." Energies 15, no. 2 (2022): 438. http://dx.doi.org/10.3390/en15020438.

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Анотація:

The thermal efficiency of an efficient gasoline engine is only about 40% and it will produce a large number of harmful products. Curbing harmful emissions and enhancing thermal efficiency have always been the goals pursued and emission regulations are also being tightened gradually. As one of the main consumers of fossil fuels, automobile engines must further reduce fuel consumption and emissions to comply with the concept of low-carbon development, which will also help them compete with electric vehicles. Homogeneous charge compression ignition (HCCI) combustion combined with variable valve a

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5

Kumar, Praveen, and Yu Zhang. "Variable Valve Strategy Evaluation for Low-Load Operation in a Heavy-Duty Gasoline Compression Ignition Engine." Energies 15, no. 6 (2022): 2017. http://dx.doi.org/10.3390/en15062017.

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Анотація:

By harnessing gasoline’s low reactivity for partially premixed combustion promotion, gasoline compression ignition (GCI) combustion shows the potential to produce markedly improved NOx-soot trade-off with high fuel efficiency compared to conventional diesel combustion. However, at low-load conditions, gasoline’s low reactivity poses challenges to attaining robust combustion with low unburned hydrocarbons (UHC) and carbon monoxide (CO) emissions. Increasing the in-cylinder charge temperature by using variable valve actuation (VVA) can be an effective means to address these challenges. In this n

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6

Romandona, Alfanda Ahmad. "PENGARUH PENGGUNAAN FUEL CATALISATOR PADA MESIN BENSIN 4 LANGKAH DENGAN SISTEM TRANSMISI MATIC BERTEKNOLOGI VARIABLE VALVE ACTUATION (VVA)." Teknosia 15, no. 2 (2022): 25–36. http://dx.doi.org/10.33369/teknosia.v15i2.19153.

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Анотація:

Menurut data Kementrian Energi dan Sumber Daya Mineral konsumsi Bahan Bakar Minyak pada 2016 meningkat 2,76% menjadi 73,56 juta kiloliter dari tahun sebelumnya. Hal ini akan sangat berdampak pada lingkungan apabila penggunaan memiliki efesiensi yang rendah sehingga kualitas pembakaran menjadi tidak sempurna, salah satu upaya untuk meningkatkan kualitas pembakaran dengan memperbaiki kualitas dan efesiensi bahan bakarnya dengan penggunaan alat fuel catalisator. Tujuan pengujian ini untuk mengetahui perbandingan daya, torsi dan emisi gas buang kadar HC, CO, O2 dan dengan penggunaan fuel catalisat

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7

Kumar, Praveen, Mark Sellnau, Ashish Shah, Christopher Whitney, and Rafael Sari. "Development of Two-Step Exhaust Rebreathing for a Low-NOx Light-Duty Gasoline Compression Ignition Engine." Energies 15, no. 18 (2022): 6565. http://dx.doi.org/10.3390/en15186565.

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Анотація:

The global automotive industry is undergoing a significant transition as battery electric vehicles enter the market and diesel sales decline. It is widely recognized that internal combustion engines (ICE) will be needed for transport for years to come; however, demands on ICE fuel efficiency, emissions, cost, and performance are extremely challenging. Gasoline compression ignition (GCI) is one approach for achieving the demanding efficiency and emissions targets. A key technology enabler for GCI is partially-premixed, compression ignition (PPCI) combustion, which involves two high-pressure, la

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8

Satalagaon, Ajay Kumar, Abhijit Guha, and Dhananjay Kumar Srivastava. "A comprehensive mathematical theory and optimized design of a high-frequency electro-pneumatic variable valve actuator for a camless IC engine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, June 20, 2024. http://dx.doi.org/10.1177/09544062241253978.

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Анотація:

This paper discusses the development of a detailed mathematical theory and its use for the design of an electronically controlled, double-acting Variable Valve Actuation (VVA) mechanism for a camless internal combustion engine, that offers a comprehensive control over the timings and the motion of the valves such that any arbitrary time-variation of the valve lift profile can be obtained at variable rotational speeds of the engine shaft. The developed theory encompasses the thermo-fluid-dynamic as well as the applied-mechanical aspects of the actuator cylinder-engine valve system performance,

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9

Wang, Yaodong, Xinmei Yuan, Yan Su, Fangxi Xie, Jincheng Li, and Yanfeng Gong. "Research and optimization of valve curve parameters for homogeneous charge compression ignition based on variable valve actuation." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, July 21, 2023. http://dx.doi.org/10.1177/09544070231186832.

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Анотація:

Homogeneous charge compression ignition (HCCI) can improve engine emissions and fuel consumption. HCCI based on variable valve actuation (VVA) benefits from the wide application of VVA technology, which makes it easier to popularize. However, most VVA mechanisms are based on cam drive and inherit from spark ignition (SI) engine, the valve lift and duration can only be increased or decreased simultaneously. Therefore, the above VVA mechanisms cannot give full play to the performance of HCCI. The control parameters of valve curve are simplified into maximum valve lift and duration. At different

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10

Joon, Sung Park, Choi Jun-Hyuk, Kim Jin-Hong, and Jung In-Soung. "Development of Motor and Controller for VVA Module of Gasoline Vehicle." December 25, 2011. https://doi.org/10.5281/zenodo.1084750.

Повний текст джерела

Анотація:

Due to environmental concerns, the recent regulation on automobile fuel economy has been strengthened. The market demand for efficient vehicles is growing and automakers to improve engine fuel efficiency in the industry have been paying a lot of effort. To improve the fuel efficiency, it is necessary to reduce losses or to improve combustion efficiency of the engine. VVA (Variable Valve Actuation) technology enhances the engine's intake air flow, reduce pumping losses and mechanical friction losses. And also, VVA technology is the engine's low speed and high speed operation to implemen

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11

Joon, Sung Park, Choi Jun-Hyuk, Kim Jin-Hong, and Jung In-Soung. "Development of Motor and Controller for VVA Module of Gasoline Vehicle." International Journal of Mechanical, Industrial and Aerospace Sciences 5.0, no. 12 (2011). https://doi.org/10.5281/zenodo.1335326.

Повний текст джерела

Анотація:

Due to environmental concerns, the recent regulation on automobile fuel economy has been strengthened. The market demand for efficient vehicles is growing and automakers to improve engine fuel efficiency in the industry have been paying a lot of effort. To improve the fuel efficiency, it is necessary to reduce losses or to improve combustion efficiency of the engine. VVA (Variable Valve Actuation) technology enhances the engine's intake air flow, reduce pumping losses and mechanical friction losses. And also, VVA technology is the engine's low speed and high speed operation to implemen

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12

Frosina, Emma, Adolfo Senatore, Dario Buono, and Luca Santato. "Analysis and Simulation of an Oil Lubrication Pump for Internal Combustion Engines." Journal of Fluids Engineering 137, no. 5 (2015). http://dx.doi.org/10.1115/1.4029442.

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Анотація:

This paper presents a simulation model of an oil-lubrication gerotor pump for internal combustion engines. The model was constructed by using a monodimensional commercial code that accounted for all phenomena that occur during the revolution of the pump shaft. Several geometric considerations and theoretical observations are presented. An experiment was also performed to validate the simulation model. In these experimental tests, particular attention was paid to the behavior of the pressure oscillations during the pump shaft revolutions. The final aim of this activity is to obtain an instrumen

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13

Teodosio, Luigi, and Fabio Berni. "Optimization via genetic algorithm of a variable-valve-actuation spark-ignition engine based on the integration between 1D/3D simulation codes and optimizer." International Journal of Engine Research, May 17, 2022, 146808742210998. http://dx.doi.org/10.1177/14680874221099874.

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Анотація:

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

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14

Jia, Zhiqin, and Lucien Koopmans. "A Hybrid Approach using Design of Experiment and Artificial Neural Network in a Camless Heavy-Duty Engine." Journal of Energy Resources Technology, May 11, 2022, 1–15. http://dx.doi.org/10.1115/1.4054533.

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Анотація:

Abstract Increasing stricter emission regulations and fleet CO2 targets drives the engine development in the direction of clean combustion and high efficiency. To achieve this goal, planning and conducting experiments in a time and cost-effective way plays an important role to find the optimal combinations of all selectable parameters. In this study, a design of experiment (DoE) model was initially generated to predict BSFC and BSNOx emissions in a camless variable valve actuation (VVA) heavy-duty engine. Due to a poor fit of the regression model for BSFC from DoE analysis, an artificial neura

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15

Sok, Ratnak, and Jin Kusaka. "Experimental and 1D Modeling Analysis of Thermoelectric Generation to Improve the Performance of Compressed Natural Gas Heavy-Duty Engines Used in Commercial 22-Ton Trucks." SAE International Journal of Sustainable Transportation, Energy, Environment, & Policy 6, no. 3 (2025). https://doi.org/10.4271/13-06-03-0019.

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Анотація:

<div>A significant amount of chemical fuel energy in internal combustion engines is wasted through exhaust heat. Waste heat recovery (WHR) systems can transform the heat into electrical energy using thermoelectric generators (TEG). This work utilizes a 1D CFD model to demonstrate the potential of TEG-WHR in improving the thermal efficiency of mass-production, compressed natural gas (CNG) engines used in commercial 22-ton heavy-duty trucks. First, the TEG with heat exchanger experiments are performed to measure thermal and electrical performance data under different fin pitches and inlet

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16

Johnston, Tyler, Jared Zeman, and Adam Dempsey. "Mixing-controlled compression ignition of ethanol using exhaust rebreathe at a low-load operating condition—Single cylinder experiments in a heavy-duty diesel engine." International Journal of Engine Research, November 19, 2024. http://dx.doi.org/10.1177/14680874241293823.

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Анотація:

As pollutant emissions regulations in the heavy-duty sector become further stringent, the energy requirements in this sector continue to increase. Due to the high-power density and operating period requirements within this sector, full electrification is challenging. A viable solution to meet the stringent requirements for criteria pollutant and greenhouse gas (GHG) emissions is the use of low carbon renewable fuels. Low carbon renewable fuels are desirable due to their lower carbon content per unit energy compared to conventional fossil diesel fuel. However, implementing some low carbon renew

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