Powertrain

A mechanical face seal model with numerical simulation of stick-slip. ... Massimiliano Borasso1, Claudio Braccesi2, Filippo Cianetti 2, Maria Cristina Valigi2 ... 1MeccanotecnicaUmbra SpA, Campello sul Clitunno (PG), Italy E-mail:mborasso@meccanotecnica.it ... 2Dipartimento di Ingegneria Industriale, University of Perugia, Italy E-mail:braccesi@unipg.it,cianfi@unipg.it ,mc.valigi@unipg.it ... Keywords: Mechanical face seals, lumped parameters model, stick-slip. ... SUMMARY. A mechanical face seal for automotive applications that under ...

This work aims to develop a mathematical model for the simulation of a fuel cell (FC) hybrid powertrain. The work starts from modeling a single cell to obtain information on the entire FC stack. The model obtained was integrated into a simulation tool presented in the literature that simulates the longitudinal dynamics of auxiliary power unit hybrid electric vehicles and fully electric vehicles. Therefore, the integrated model allows the simulation of hybrid vehicles equipped with FC and a battery pack that acts as a peak power source. The tool simulates the mechanical and electrical behavior of the vehicle, introducing an investigation of the power flows relating to the FC and batteries. An appropriate power split logic has been implemented, allowing the correct management of the power distribution between the FC and the batteries. The importance of analyzing FC vehicles’ behavior arises from the recent necessity to find alternative propulsion systems, overcoming the range problems...

The H2-ICE project aims at developing, through numerical simulation, a new generation of hybrid powertrains featuring a hydrogen fueled Internal Combustion Engine (ICE) suitable for 12-meter urban buses, in order to provide a reliable and cost-effective solution for the abatement of both CO2 and criteria pollutant emissions. The full exploitation of the potential of such a traction system requires a substantial enhancement of the state of the art since several issues have to be addressed. In particular, the choice of the more suitable fuel injection system, as well as the control of the combustion process, are extremely challenging. Firstly, a high-fidelity 3D-CFD model will be exploited to analyze the in-cylinder H2 fuel injection through supersonic flows. Then, after the optimization of the injection and combustion process, a 1D model of the whole engine system will be built and calibrated allowing the identification of a “sweet spot”, in the ultra-lean combustion region, characte...

Corresponding author Email address: pb16573@gmail.com (Poornima .R. Bodke) ISSN 0976 – 6693. ©2020 SCMR All rights reserved. Abstract The study of dynamic behavior of Electric Power Steering System (EPAS) is very critical to understand the overall handling of the vehicle. The appropriate feedback from the steering to the driver is crucial so that the driver get the precise steering feel in order to control the vehicle with ease during all kinds of maneuvers. For a maximum tire life, the steering system should maintain, a proper tire road contact, and proper tire geometry with respect to the chassis both during cornering and straight-ahead driving. The driver should be able to turn the vehicle with ease during low as well as high speed maneuver. A complete steering system dynamic model is developed and is integrated with the full vehicle model using AMESIM 1D simulation platform. The simulation is carried out as per the guidelines laid by the ISO 7401 standard criterion. In this proj...

To date, with the advancement in energy-related technology, the regulations prior to the environment and energy emission are also strictly increasing due to the impact of global warming. Hence, many electric vehicles are affected since one of their principles is closely related to the issue of short-range storage capacity and long charging time which are not in favor to most of the automotive customers. Thus, it embarks many kinds of research to establish development of an efficient energy management storage (EMS) to fulfill the objectives at the same time keeping the vehicle performance at its convincing standard. This work presents the Hyperheuristics Trajectory Based Optimization for Energy Management Storage (EMS) of The Split Plug-in Hybrid Electric Vehicle. The Split Plug-in Hybrid Electric Vehicle is discussed in different and recent perspective by zooming into other aspects of EMS point of view. A comprehensive discussion is elaborated by comparing various strength and weakn...

Improving powertrain efficiency and reducing vehicle weight are two options for reducing vehicle energy use, emissions, and operating cost that often increase the purchase cost of passenger vehicles. Increasing drivetrain efficiency shrinks the potential for reducing energy use by lightweighting and conversely lighter vehicles benefit less from efficiency improvement. This paper describes a methodology for finding the optimum combination of light-weighting and efficiency measures to achieve minimum lifetime vehicle cost. Using representative technology cost assumptions for a mid-sized passenger car, marginal efficiency improvement in the range of 20 to 30% and lightweighting between 200 and 600 kg are optimal, depending strongly on marginal cost curve characteristics. A reduction in the total cost of vehicle ownership of between 18 and 42% is possible for the representative technology implementation scenarios. In the absence of reliable cost data, a general strategy of designing lig...

Commentata la diffusione dei trattori agricoli in Italia e svolta una rassegna degli effetti delle vibrazioni sui trattoristi, sono riportati i valori delle accelerazioni riscontrati nel nostro Paese, nonche i livelli di esposizione degli operatori. Individuati i parametri che determinano le vibrazioni, sono illustrati gli interventi in grado di contenerle. Sono inoltre riportati i risultati di una ricerca su tre trattori agricoli: i rilievi delle vibrazioni triassiali sul piano e sul basamento del sedile e le misure del rumore in prossimita di ambedue gli orecchi dell’operatore sono stati eseguiti durante l’aratura, l’erpicatura e la traslazione su strada sterrata e asfaltata, a diverse velocita di avanzamento e a differenti valori di pressione di gonfiaggio degli pneumatici. ------ After the assessment of the agricultural tractors fleet characteristics in Italy and a review of the effects of vibration on tractor drivers, the typical acceleration values and consequent operators’ ex...

This paper presents study results on manufacture full-hybrid car model. The power system including two-stroke 25cc gasoline-oil engine and 300W 3-phase-brushless electric motor which can operates at motor or generator modes. The gasoline engine and brushless motor are combined though an electric-controlled gear box with forward and backward states. The hybrid car model is wireless-controlled by application in based on Android system smart phone and an electric control board. The hybrid car model was successfully manufactured based on experiment and reference from other previous studies. In order to take a step into hybrid technology in Vietnam, this hybrid car model is helpful in development researchs in automotive technology. In addition, this study provides document and equipment for improving education quality in automotive, mechatronics majors.

The project has been implemented on behalf of FKAB, an independent marine engineering company mainly active in the marine and shipbuilding industry. One important objective of FKAB is to contribute to a better environment and a sustainable shipping. One way to achieve this goal is through electric propulsion. The thesis attempts to investigate whether a conversion from diesel to electrical propulsion is applicable on the vessel Alvsnabben 4 for sailing a specified route along Gota Alv. The most essential considerations are the space allocation to accommodate the batteries and what components can be removed from the existing powertrain. Furthermore, feasibility studies must be conducted to confirm whether Goteborgs harbor has the sufficient amount of energy available and also affirm the amount of energy the vessel requires for the given route. To enable a conversion requires identification of the operational profile for the vessel, design of the powertrain and choice of battery. The ...

In the modern powertrains with new low emission combustion engines, the effort to reduce emissions and weight of the entire system increase the efficiency of vehicle drives but also make the drive much more sensitive to vibration. The new design concepts of dual-mass flywheels offer more options for eliminating vibration in vehicle drive systems. Every design of the dual-mass flywheel must ensure that it has the appropriate characteristics. A suitable characteristic then creates a prerequisite for application in a drive in which the resonance area can be moved to very low operating speed.

Intake manifold determines the charge flowing or the mass flow rate of the fuel and air mixture, which affects the volumetric efficiency of the engine. It has a great impact on engine power and torque. They are greatly pompous by degree to which cylinders are charged & geometrical parameters of intake manifold. Every specified engine has its specific engine speed and it can be optimized with the help of the intake manifold geometry. Current work aims to study the effects of various designs of Intake manifolds for a naturally aspirated Royal Enfield EFI500 engine and to increase volumetric efficiency for FSAE related competitions, by doing CFD simulations and tuning of runner length. The objective is to increase the volumetric efficiency of the engine assuming a standard restriction of 20mm diameter to limit the overall power output. After CFD on intake manifold, results obtained in the least pressure drop and hence maximum volumetric efficiency.

A mechanical face seal model with numerical simulation of stick-slip. ... Massimiliano Borasso1, Claudio Braccesi2, Filippo Cianetti 2, Maria Cristina Valigi2 ... 1MeccanotecnicaUmbra SpA, Campello sul Clitunno (PG), Italy E-mail:mborasso@meccanotecnica.it ... 2Dipartimento di Ingegneria Industriale, University of Perugia, Italy E-mail:braccesi@unipg.it,cianfi@unipg.it ,mc.valigi@unipg.it ... Keywords: Mechanical face seals, lumped parameters model, stick-slip. ... SUMMARY. A mechanical face seal for automotive applications that under ...

Reducing transportation-related energy consumption and greenhouse gas (GHG) emissions have been a common goal of public agencies and research institutes for years. In 2013, the total energy consumed by the transportation sector in the United States was as high as 24.90 Quadrillion BTU. U.S. Environmental Protection Agency (EPA) reported that nearly 27% GHG emissions resulted from fossil fuel combustion for transportation activities in 2013. From a vehicle perspective, innovative powertrain technologies, such as hybrid electric vehicles (HEVs), are very promising in improving fossil fuel efficiency and reducing exhaust emissions. Plug-in hybrid electric vehicles (PHEVs) attracted most of the attention due to their ability to also use energy off of the electricity grid, through charging their batteries, thereby achieving even higher overall energy efficiency. At the heart of the PHEV technologies, the energy management system whose functionality is to control the power streams from bo...