Готові списки джерел за темами / VVA-Variable Valve Actuation

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Добірка наукової літератури з теми "VVA-Variable Valve Actuation"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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

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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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.

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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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Більше джерел

Дисертації з теми "VVA-Variable Valve Actuation"

Schneider, Wolfgang. "Fully variable, simple and efficient - electrohydraulic - valve train for reciprocating engines." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71231.

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A new camless electrohydraulic valve train concept for combustion engines was developed at Empa (Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland) and tested on a spark ignition passenger car engine. Besides full flexibility with regard to lift and timing of the engine gas exchange valves it features robustness, simplicity and in particular a low own drive power need due to a maximum of hydraulic energy recuperation. The engine test results confirm substantial efficiency gains in classical as well as in hybrid power trains while also maintaining additiona

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(6594053), Cody M. Allen. "Advancing Diesel Engines via Cylinder Deactivation." Thesis, 2019.

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Анотація:

The transportation sector continues to be a primary source of greenhouse gas (GHG) emissions, contributing more than any other sector in the United States in 2017. Medium-duty and heavy-duty trucks trail only passenger cars as the largest GHG contributor in this sector [1]. The intense operating requirements of these vehicles create a reliance on the diesel engine that is projected to last for many decades. Therefore, it is vital that the efficiency and environmental sustainability of diesel engines continue to be advanced.<br><br>Cylinder deactivation (CDA) is a promising technology to improv

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Частини книг з теми "VVA-Variable Valve Actuation"

Septiyanto, Angga, Iqbal Umar Said, M. Burhan Rubai W., Andri Setiyawan, Ahmad Mustamil Khoiron, and Ranu Iskandar. "Effectiveness of Implementing Android-Based Variable Valve Actuation (VVA) Media in Learning at Vocational High School." In 5th Vocational Education International Conference (VEIC 2023). Atlantis Press SARL, 2024. http://dx.doi.org/10.2991/978-2-38476-198-2_50.

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Тези доповідей конференцій з теми "VVA-Variable Valve Actuation"

Gecim, Burak, and Madhusudan Raghavan. "Variable Valve Actuation for Advanced Powertrains." In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49549.

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Анотація:

We review variable valve actuation (VVA) concepts and also present the results of our work in the creative synthesis of these devices. We begin with a comprehensive survey of existing VVA devices. We then describe our work on four VVA concepts which we have explored in considerable detail. These include hydraulic lost-motion variable-lift systems, in both the direct acting and the roller-finger-follower configurations, several valve deactivation mechanisms with unique features, a variable valve-lift mechanism, and a variable-lift and duration concept. These devices differ in their complexity a

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Pierik, Ronald J., and James F. Burkhard. "Design and Development of a Mechanical Variable Valve Actuation System." In International Mobility Technology Conference and Exhibit. SAE International, 2000. http://dx.doi.org/10.4271/2000-01-3307.

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<div class="htmlview paragraph">Compromises inherent with fixed valve lift and event timing have prompted engine designers to consider Variable Valve Actuation (VVA) systems for many decades. In recent years, some relatively basic forms of VVA have been introduced into production engines. Greater performance and driveability expectations of customers, more stringent emission regulations set by government legislators, and the mutual desire for higher fuel economy are increasingly at odds. As a solution, many OEM companies are seriously considering large-scale application of higher functio

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Pournazeri, Mohammad, Amir Khajepour, and Amir Fazeli. "A New Valve Lift Control Technique in Electrohydraulic Variable Valve Actuation Systems." In ASME 2010 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/icef2010-35050.

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Анотація:

Besides valve timings and opening duration control, several benefits could be achieved in engine operation if the valve actuation system could control the maximum valve displacement during a particular engine condition. Typically, in most electro-hydraulic variable valve actuation systems (VVA), the maximum valve lift along with valve opening/closing events are adjusted simultaneously by precise control of the spool travel in servo-valves. However, at high engine speeds, concurrent control of timings and peak valve lift becomes difficult and sometimes even impossible due to servo-valve respons

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Abagnale, Carmelina, Mariano Migliaccio, and Ottavio Pennacchia. "Design of a New Mechanical Variable Valve Actuation System for Motorcycle Engines." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82317.

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This paper deals with design and manufacturing of a mechanical variable valve actuation (VVA) system, developed as part of a MUR financed research project concerning the realization of a high performance motorcycle engine, through a partnership of Moto Morini (Bologna), Dell’Orto (Milano), Istituto Motori - CNR (Napoli) and DiME (Department of Mechanical Engineering and Energetics) – University of Napoli Federico II. After a synthetic description of the main variable valve actuation methods currently employed, the paper presents the results of our mechanical VVA system, consisting of three mai

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Burk, Reinhard, Frederic Jacquelin, and Russell Wakeman. "Using Co-Simulation Methods to Establish Variable Valve Actuation Hardware Specifications and Control Strategies." In ASME 2001 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-ice-427.

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Abstract With the increasing recognition that variable valve actuation (VVA) in its various forms is a powerful tool for optimizing the performance of internal combustion engines, more and more production systems are being designed and implemented throughout the industry. However, as these control systems become more capable of altering lift, timing, duration, and even the number of valve events, the complexity of designing algorithms and calibrating them becomes enormous. In addition, without prior knowledge of an engine’s response to these algorithms, designing a cost-effective mechanism whi

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Jain, Ashish, S. S. Tikar, S. S. Ramdasi, S. S. Thipse, N. V. Marathe, and Porpatham Ekambaram. "Design and Development of Variable Valve Actuation (VVA) Mechanism Concept for Multi-Cylinder Engine." In Symposium on International Automotive Technology 2015. SAE International, 2015. http://dx.doi.org/10.4271/2015-26-0021.

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Baratta, Mirko, Roberto Finesso, Daniela Misul, Ezio Spessa, Yifei Tong, and Cesare Peletto. "Potential of the Variable Valve Actuation (VVA) Strategy on a Heavy Duty CNG Engine." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20217.

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The environmental concerns officially aroused in 1970s made the control of the engine emissions a major issue for the automotive industry. The corresponding reduction in fuel consumption has become a challenge so as to meet the current and future emission legislations. Given the increasing interest retained by the optimal use of a Variable Valve Actuation (VVA) technology, the present paper investigates into the potentials of combining the VVA solution to CNG fuelling. Experiments and simulations were carried out on a heavy duty 6-cylinders CNG engine equipped with a turbocharger displaying a

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Satalagaon, Ajay Kumar, Abhijit Guha, and Dhananjay Kumar Srivastava. "Development and Control System Design of an Electro-Pneumatic Variable Valve Actuator to Be Retrofitted to an SI Engine." In WCX SAE World Congress Experience. SAE International, 2025. https://doi.org/10.4271/2025-01-8377.

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<div class="section abstract"><div class="htmlview paragraph">In a conventional cam-based valve actuation system, the valve events are tied up with the rotation of the crankshaft. In contrast, the electronic variable valve actuation (VVA) system enables flexible control of valve events independent of the crankshaft rotation. The present article discusses the development and control system design of a single-acting electro-pneumatic variable valve actuation (EPVVA) system that can be retrofitted to a conventional SI engine. The EPVVA system utilizes fast switching solenoid valves wh

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Battistoni, Michele, Carlo N. Grimaldi, and Francesco Mariani. "Numerical Study of SI Engine Part Load Operating Conditions Using Different VVA Strategies." In ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/icef2011-60205.

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In SI engines, VVA (Variable Valve Actuation) technology is mainly used for the reduction of pumping losses at part load. This paper presents the results of fluid dynamic analyses on a 4V engine about the effects of different VVA strategies, by comparing and discussing the results in terms of organized charge motions, turbulence levels, flame developments, NO and CO emissions. CFD simulations cover five load control cases: comparison is among conventional throttling, EIVC (Early Intake Valve Closure) with symmetric and asymmetric intake lifts, LIVC (Late Intake Valve Closure) and symmetrical M

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Baratta, Mirko, and Ezio Spessa. "Turbocharged CNG Engines for Urban Transportation: Evaluation of Turbolag Reduction Strategies by Means of Computational Analyses." In ASME 2009 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ices2009-76067.

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Nowadays, many urban buses for public transportation are fuelled by compressed natural gas (CNG), due to its potential for energy saving and pollutant reduction, with specific reference to particulate matter emissions. However, turbocharging is required to recover the gaseous-fuel related power gap with respect to more traditional engines running on liquid fuels. Therefore, turbolag reduction is fundamental to achieve high performance during engine transients. Significant support for the study of turbocharged CNG engines and guidelines for the turbomatching process can be provided by 1D numeri

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