The Experts below are selected from a list of 77661 Experts worldwide ranked by ideXlab platform
Sergio Bova - One of the best experts on this subject based on the ideXlab platform.
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fluid dynamic investigation of innovative Intake strategies for multivalve internal combustion engines
International Journal of Mechanical Sciences, 2017Co-Authors: Alessandra Nigro, Angelo Algieri, Carmine De Bartolo, Sergio BovaAbstract:Abstract The aim of the paper is to investigate the influence of novel opening strategies for Intake valves on the permeability and in-cylinder flow of a multivalve spark-ignition internal combustion engine. Specifically, the deactivation of an Intake valve and asymmetric valves lifts are analysed and compared to the standard symmetric valves opening. To this purpose, a computational fluid dynamic (CFD) analysis is performed by using a finite volume code and an experimental activity is done at a steady flow rig. The investigation is carried out for different Intake strategies and engine load conditions and the comparison between CFD and experimental flow coefficients shows a good agreement. The results demonstrate that the proper combination of different valves strategies permits the effect of the throttling process at medium and low engine load to be minimised, improving the breathability of the Intake System, and creating more organised and energised mean flow structures within the combustion chamber.
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Development of a Lumped Model for the Characterisation of the Intake Phase in Spark-ignition Internal Combustion Engines☆
Energy Procedia, 2016Co-Authors: Pietropaolo Morrone, Angelo Algieri, Sergio BovaAbstract:Abstract The present work aims to develop a control-oriented lumped model to investigate the fluid dynamic behaviour of multi-valve spark-ignition engines (ICEs). Specifically, the attention has been focused on the Intake phase and in-cylinder air charge estimation. To this purpose, a spark-ignition engine has been characterised at a flow rig in terms of flow coefficients. The experimental data have been used to define the fluid dynamic behaviour of the different Intake System components and to calibrate and validate the proposed model that has been developed in Matlab/Simulink environment. Furthermore, in order to evaluate the capability of the zero-dimensional code and to estimate the instantaneous in-cylinder mass flow in different operating conditions, the numerical data have been compared to the results of a one-dimensional commercial software. The comparison between numerical and experimental data shows a good agreement. The investigation highlights that the proposed control-oriented lumped model represents a useful and simple tool to evaluate the engine breathability and to define the proper valve timing.
Angelo Algieri - One of the best experts on this subject based on the ideXlab platform.
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fluid dynamic investigation of innovative Intake strategies for multivalve internal combustion engines
International Journal of Mechanical Sciences, 2017Co-Authors: Alessandra Nigro, Angelo Algieri, Carmine De Bartolo, Sergio BovaAbstract:Abstract The aim of the paper is to investigate the influence of novel opening strategies for Intake valves on the permeability and in-cylinder flow of a multivalve spark-ignition internal combustion engine. Specifically, the deactivation of an Intake valve and asymmetric valves lifts are analysed and compared to the standard symmetric valves opening. To this purpose, a computational fluid dynamic (CFD) analysis is performed by using a finite volume code and an experimental activity is done at a steady flow rig. The investigation is carried out for different Intake strategies and engine load conditions and the comparison between CFD and experimental flow coefficients shows a good agreement. The results demonstrate that the proper combination of different valves strategies permits the effect of the throttling process at medium and low engine load to be minimised, improving the breathability of the Intake System, and creating more organised and energised mean flow structures within the combustion chamber.
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Development of a Lumped Model for the Characterisation of the Intake Phase in Spark-ignition Internal Combustion Engines☆
Energy Procedia, 2016Co-Authors: Pietropaolo Morrone, Angelo Algieri, Sergio BovaAbstract:Abstract The present work aims to develop a control-oriented lumped model to investigate the fluid dynamic behaviour of multi-valve spark-ignition engines (ICEs). Specifically, the attention has been focused on the Intake phase and in-cylinder air charge estimation. To this purpose, a spark-ignition engine has been characterised at a flow rig in terms of flow coefficients. The experimental data have been used to define the fluid dynamic behaviour of the different Intake System components and to calibrate and validate the proposed model that has been developed in Matlab/Simulink environment. Furthermore, in order to evaluate the capability of the zero-dimensional code and to estimate the instantaneous in-cylinder mass flow in different operating conditions, the numerical data have been compared to the results of a one-dimensional commercial software. The comparison between numerical and experimental data shows a good agreement. The investigation highlights that the proposed control-oriented lumped model represents a useful and simple tool to evaluate the engine breathability and to define the proper valve timing.
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Comparative analysis of the fluid dynamic efficiency of standard and alternative Intake strategies for multivalve spark-ignition engines
International Journal of Engineering & Technology, 2013Co-Authors: Angelo AlgieriAbstract:The work aims at investigating the fluid dynamic performances of a multivalve spark-ignition engine and at evaluating the influence of the throttling process on the engine permeability. To this purpose, a production four-stroke internal combustion engine is analysed during the Intake phase. The experimental characterisation is carried out at the steady flow rig in terms of dimensionless discharge and flow coefficients. The global investigation illustrates the noticeable effect of the valve lift on the engine head breathability. Furthermore, the experimental analysis demonstrates that the throttling process has a significant influence on the volumetric efficiency of the Intake System and this effect increases with the valve lift. Finally, alternative strategies are studied in order to improve the engine fluid dynamic efficiency at partial loads. Specifically, the research shows that inlet valve deactivation and the adoption of asymmetric Intake valve lifts assure an increase in head permeability.
Giovanni Ferrara - One of the best experts on this subject based on the ideXlab platform.
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development of an engine variable geometry Intake System for a formula sae application
Energy Procedia, 2015Co-Authors: Giovanni Vichi, Luca Romani, Lorenzo Ferrari, Giovanni FerraraAbstract:Abstract The Formula SAE is an international competition for vehicle fully designed and built by students from worldwide Universities. The engine and vehicle design in the Formula SAE competition has to comply with a strict regulation. Regarding the engine Intake line an air restrictor of circular cross-section no greater than 20 mm must be fitted between the throttle valve and the engine inlet. The aim of the throat is to limit the engine air flow rate as it strongly influences the volumetric efficiency and then the maximum power. The present paper is focused on the design of the engine Intake System of the Firenze Race Team vehicle in order to optimize its performance in terms of both the maximum power and the drivability of the vehicle. One of the typical solutions for limiting the air restrictor influence consists of a plenum chamber placed along the Intake line downstream of the restrictor. However the plenum involves also a delay in the engine response during the transient phases. The greater is the plenum, the lower are the power losses but the greater is the engine response delay. Taking advantage of a calibrated 1D model of the engine and a simplified vehicle model, the authors numerically analyzed an innovative solution that is constituted by a variable length duct inside the plenum. When the duct is at the maximum extension, the plenum is excluded from the Intake line improving the engine response time. The optimization of the plenum volume and the definition of a preliminary control logic of the innovative System were done in order to obtain the maximum advantages in terms of both performance and engine drivability.
Zhang Yi-min - One of the best experts on this subject based on the ideXlab platform.
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Optimization design of acoustic performance of mini gasoline engine's Intake System
Journal of Engineering Design, 2010Co-Authors: Zhang Yi-minAbstract:With the increase of automotive comfort need,the requirement of acoustic performance of the engine's Intake System is increasing.Based on acoustic theory,the numerical model with multi-parameter of air cleaner of mini gasoline engine was built.On the one hand,through simulation of the noise of mini gasoline engine's straight pipe orifice,the target value of Intake System's insert loss was gotten;on the other hand,considering the target value of insert loss,the target value of transfer loss of mini gasoline engine's Intake System was estimated.By associating with air cleaner's acoustic numerical model,air cleaner's structure parameters were optimized.The design method of acoustic performance of mini gasoline engine's Intake System has great practical engineering significance,and the numerical model with multi-parameter provides theoretical basis for parameter design of air cleaners of mini gasoline engine.
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Dynamic sensitivity design of acoustic property of Intake System of an engine
Journal of Vibration Engineering, 2010Co-Authors: Zhang Yi-minAbstract:The noise of Intake System of an engine is one of the most important noise sources of a vehicle,and it affects interior noise more markedly.Based on the theory of pipeline acoustics,the method of noise simulation of Intake System of an engine—no-source-method has been brought forward;based on the concentrative parameter model of Helmholtz resonator,the method of acoustic property dynamic sensitivity design of Intake System of an engine has been brought forward.Applying no-source-method,while the emulation model of an engine could not be provided,the acoustic property dynamic sensitivity design of Intake System could be carry through however,the exact information of acoustic property sensitivity design of Intake System could be gotten rapidly through simulation,this provides a reference for the acoustic property design of Intake System optimized.
Mattias Nyberg - One of the best experts on this subject based on the ideXlab platform.
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model based diagnosis of an automotive engine using several types of fault models
IEEE Transactions on Control Systems and Technology, 2002Co-Authors: Mattias NybergAbstract:Automotive engines is an important application for model-based diagnosis because of legislative regulations. A diagnosis System for the air-Intake System of a turbo-charged engine is constructed. The design is made in a Systematic way and follows a framework of hypothesis testing. Different types of sensor faults and leakages are considered. It is shown how many different types of fault models, e.g., additive and multiplicative faults, can be used within one common diagnosis System, and using the same underlying design principle. The diagnosis System is experimentally validated on a real engine using industry-standard dynamic test-cycles.
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model based diagnosis for the air Intake System of the si engine
SAE transactions, 1997Co-Authors: Mattias Nyberg, Lars NielsenAbstract:Because of legislative regulations like OBDII, on-board diagnosis has gained much interest lately. A model based approach is suggested for the diagnosis of the air Intake System of an SI-engine. Im ...