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Viewing 1 to 30 of 121
2017-06-05
Technical Paper
2017-01-1784
Guillaume Baudet
Abstract Wind noise in automobile is becoming more and more important as customer requirements increase. On the other hand great progress has been made on engine and road noises. Thus, for many vehicles, wind noise is the major acoustic source during road and motorway driving. As for other noises, automobile manufacturers must be able for a new car project to specify, calculate and measure each step of the acoustic cascading: Source Transfers, both solid and air borne In the case of automotive wind noise, the excitation source is the dynamic pressure on the vehicle’s panels. This part of the cascading is the one influenced by the exterior design. Even if many others components (panels, seals, cabin trims) have a big influence, the exterior design is a major issue for the wind noise. The wind noise level in the cabin can sometimes change significantly with only a small modification of the exterior design.
2017-05-08
Article
American Formula One viewers squinting through bleary eyes at the live early-morning broadcasts from Europe have noticed changes to the sophisticated race cars for the 2017: they are visibly lower, wider and squatter-looking than last year’s cars.
2017-03-28
Technical Paper
2017-01-0538
Corinna Netzer, Lars Seidel, Michal Pasternak, Christian Klauer, Cathleen Perlman, Frederic Ravet, Fabian Mauss
Abstract Engine knock is an important phenomenon that needs consideration in the development of gasoline fueled engines. In our days, this development is supported by the use of numerical simulation tools to further understand and subsequently predict in-cylinder processes. In this work, a model tool chain based on detailed chemical and physical models is proposed to predict the auto-ignition behavior of fuels with different octane ratings and to evaluate the transition from harmless auto-ignitive deflagration to knocking combustion. In our method, the auto-ignition and emissions are calculated based on a new reaction scheme for mixtures of iso-octane, n-heptane, toluene and ethanol (Ethanol consisting Toluene Reference Fuel, ETRF). The reaction scheme is validated for a wide range of mixtures and every desired mixture of the four fuel components can be applied in the engine simulation.
2017-03-28
Technical Paper
2017-01-0669
Matthieu LEGUILLE, Frederic Ravet, Jerome Le Moine, Eric Pomraning, Keith Richards, P. K. Senecal
Abstract The current trend of downsizing used in gasoline engines, while reducing fuel consumption and CO2 emissions, imposes severe thermal loads inside the combustion chamber. These critical thermodynamic conditions lead to the possible auto-ignition (AI) of fresh gases hot-spots around Top-Dead-Center (TDC). At this very moment where the surface to volume ratio is high, wall heat transfer influences the temperature field inside the combustion chamber. The use of a realistic wall temperature distribution becomes important in the case of a downsized engine where fresh gases hot spots found near high temperature walls can initiate auto-ignition. This paper presents a comprehensive numerical methodology for an accurately prediction of thermodynamic conditions inside the combustion chamber based on Conjugate Heat Transfer (CHT).
2017-03-05
Article
A new version of the LG Chem Z.E. 40 battery delivers nearly double the energy density of its predecessor.
2017-02-10
Article
Renault is teaming up with ARM, the multinational semiconductor and software design company, to open the software and hardware architecture of the little Twizy.
2016-11-14
Article
Conti’s 48-V system will be standard equipment on both gasoline and diesel versions of the Scenic Hybrid Assist model. It is the first of multiple 48-V production announcements coming over the next few years.
2016-10-24
Article
The key to engineering greatness is the willingness to take intelligent risks—both reputational and risks with the product, says one of the industry's greatest "product guys."
2016-10-20
Article
Leveraging junior racing to interest youngsters in engineering careers gets a boost in Europe as Renault launches a UK Clio Cup Junior Championship for 2017.
2016-10-03
Article
At the Paris Motor Show, the Infiniti brand unveiled the VC-Turbo 2.0-L variable compression ratio engine aimed at replacing Nissan's 3.5-L V6. It is being readied for series production in early 2018.
2016-04-05
Technical Paper
2016-01-0562
Hassan Karaky, Gilles Mauviot, Xavier Tauzia, Alain Maiboom
Abstract Due to its harmful effect on both human health and environment, soot emission is considered as one of the most important diesel engine pollutants. In the last decades, the industrial engine manufacturers have been able to strongly reduce its engine-out value by many different techniques, in order to respect the stricter emission norms. Simulation modeling has played and continues to play a key role for this purpose in the engine control system development. In this context, this paper proposes a new soot emission model for a direct injection diesel engine. This soot model is based on a zero-dimensional semi-physical approach coupled with a crank-angle resolved combustion model and a thermodynamic calculation of the burned gas products temperature. Furthermore, a multi linear regression model has been used to estimate the soot emissions as function of significant physical combustion parameters.
2016-04-05
Technical Paper
2016-01-0554
José Galindo, Andrés Tiseira, Roberto Navarro, Daniel Tarí, Hadi Tartoussi, Stéphane Guilain
Abstract 0D-1D codes allow researchers to obtain a prediction of the behavior of internal combustion engines with little computational effort. One of the submodels of such codes is devoted to the centrifugal compressor. This model is often based on the compressor performance maps, therefore requiring the extrapolation of the maps so that all possible operating conditions are covered. Particularly, a suitable extrapolation of isentropic efficiency map is sought. This work first examines different available methods for compressor efficiency extrapolation into off-design conditions. No method is found to provide satisfactory results at all extrapolated regions: low and high compressor speeds and low compression ratio at measured speeds. Hence, a new method is proposed and its accuracy is assessed with the aid of compressor off-design measurements.
2016-04-05
Technical Paper
2016-01-1034
Georges Salameh, Pascal Chesse, David Chalet, Vincent Talon
Abstract Engine downsizing is potentially one of the most effective strategies being explored to improve fuel economy. A main problem of downsizing using a turbocharger is the small range of stable functioning of the turbocharger centrifugal compressor at high boost pressures, and hence the measurement of the performance maps of both compressor and turbine. Automotive manufacturers use mainly numerical simulations for internal combustion engines simulations, hence the need of an accurate extrapolation model to get a complete turbine performance map. These complete maps are then used for internal combustion engines calibration. Automotive manufacturers use commercial softwares to extrapolate the turbine narrow performance maps, both mass flow characteristics and the efficiency curve.
2016-02-01
Technical Paper
2016-28-0007
R V Manikanta Chari Kancherla, Balamurugan Rathinam, Benoit Douailler, Upendra Naithani, Vincent Dugue, Francois Vaxelaire
Abstract This state of art investigation report explains the limitations of Rosin-Rammler approach in comparison with breakup approach. The injection phenomenon of a commercial injector is simulated at various injection pressures, with Heptane (C7H16) in a spray bomb. It is observed that Breakup approach is better suitable in terms of correlation for spray modelling than the Rosin-Rammler approach when the injection pressures are 10 and 20 MPa, the SMD correlation shows also a good correlation at these pressures. At 4 MPa, correlation is a bit poorer, which is coherent as break-up models are best suited to high injection pressures configurations. Also, in each approach the primary dependent parameters are fine-tuned and their effects are discussed.
2016-01-20
Article
System offers fast response and eliminates piston drag, but hydraulic output to front wheels is still needed for larger cars.
2015-04-14
Journal Article
2015-01-1746
Hassan Karaky, Gilles Mauviot, Xavier Tauzia, Alain Maiboom
Abstract Reducing NOx tailpipe emissions is one of the major challenges when developing automotive Diesel engines which must simultaneously face stricter emission norms and reduce their fuel consumption/CO2 emission. In fact, the engine control system has to manage at the same time the multiple advanced combustion technologies such as high EGR rates, new injection strategies, complex after-treatment devices and sophisticated turbocharging systems implemented in recent diesel engines. In order to limit both the cost and duration of engine control system development, a virtual engine simulator has been developed in the last few years. The platform of this simulator is based on a 0D/1D approach, chosen for its low computational time. The existing simulation tools lead to satisfactory results concerning the combustion phase as well as the air supply system. In this context, the current paper describes the development of a new NOx emission model which is coupled with the combustion model.
2015-04-14
Technical Paper
2015-01-1698
Balamurugan Rathinam, Frederic Ravet, Cedric Servant, Laurent Delahaye, Upendra Naithani
This paper is focused on the experimental and numerical investigation of tumble motion on a single cylinder optical engine on three important parameters like engine load conditions, engine speed and level of tumble. Experiments are conducted in an optical engine and the velocity fields are measured with the aid of advanced particle image velocimetry (PIV) measurement technique. For simulation, multiple cases were considered to develop the numerical process for transient in-cylinder aerodynamics to capture the tumble motion and turbulence level in a Spark Ignited (SI) engine. The simulation results, velocity fields of each case were directly compared with the corresponding test results for different crank positions of the engine. On comparison, a good agreement between the measurement and the simulation is obtained for different configurations.
2015-04-14
Journal Article
2015-01-0830
Jesus Benajes, Ricardo Novella, Daniela De Lima, Pascal Tribotte
Abstract Partially Premixed Combustion (PPC) of fuels in the gasoline octane range has proven its potential to achieve simultaneous reduction in soot and NOX emissions, combined with high indicated efficiencies; while still retaining proper control over combustion phasing with the injection event, contrary to fully premixed strategies. However, gasoline fuels with high octane number as the commonly available for the public provide a challenge to ensure reliable ignition especially in the low load range, while fuel blends with lower octane numbers present problems for extending the ignition delay in the high load range and avoid the onset of knocking-like combustion. Thus, choosing an appropriate fuel and injection strategy is critical to solve these issues, assuring successful PPC operation in the full engine map.
2014-11-13
Article
A Ford safety application took the grand prize at the 2014 Society of Plastics Engineers (SPE) Automotive Innovation Awards gala on November 12 in Livonia, MI.
2014-11-11
Technical Paper
2014-32-0011
Pavel Brynych, Jan Macek, Pascal Tribotte, Gaetano De Paola, Cyprien Ternel
Abstract The objective of this paper is to present the results of the GT Power calibration with engine test results of the air loop system technology down selection described in the SAE Paper No. 2012-01-0831. Two specific boosting systems were identified as the preferred path forward: (1) Super-turbo with two speed Roots type supercharger, (2) Super-turbo with centrifugal mechanical compressor and CVT transmission both downstream a Fixed Geometry Turbine. The initial performance validation of the boosting hardware in the gas stand and the calibration of the GT Power model developed is described. The calibration leverages data coming from the tests on a 2 cylinder 2-stroke 0.73L diesel engine. The initial flow bench results suggested the need for a revision of the turbo matching due to the big gap in performance between predicted maps and real data. This activity was performed using Honeywell turbocharger solutions spacing from fixed geometry waste gate to variable nozzle turbo (VNT).
2014-10-15
Article
It is 30 years since Renault invented the large European MPV with the original five or seven-seat Espace. The latest Espace, launched at the 2014 Paris Motor Show, revealed a departure from traditional monospace MPV design with a crossover format, claims the company, based closely on the Initiale concept shown at the Frankfurt Motor Show a year ago.
2014-10-08
Article
The model-based systems engineering approach allows Renault to evaluate, throughout the development phases, the key attributes of the complete vehicle including the engine, transmission, actuators, and chassis.
2014-04-01
Technical Paper
2014-01-0447
Renaud Deborne, Skárlet Khouri Silva, Andras Kemeny
Abstract By the action on the steering wheel, the driver has the capability to control the trajectory of its vehicle. Nevertheless, the steering wheel has also the role of information provider to the driver. In particular, the torque level at the steering wheel informs the driver about the interaction between the vehicle and the road. This information flow is natural due to the mechanical chain between the road and the steering wheel. Many studies have shown that steering wheel torque feedback is crucial to ensure the control of the vehicle. In the context of uncoupled steering (steer-by-wire vehicle or driving simulators), the torque rendering on the steering wheel is a major challenge. In addition, of the trajectory control, the quality of this torque is a key for the immersion of drivers in virtual environment such as in driving simulators. The torque-rendering loop is composed of different steps.
2014-01-22
Article
Software company rFactor Pro developed software for a major F1 team to overcome the problem of driver-in-the-loop simulator dynamics reaction lag (latency); now it is cascading the solution into production vehicle simulators.
2013-12-10
Article
Currently just an importer, Renault will develop and build vehicles in China under a joint venture with Dongfeng that on Dec. 5 was officially approved by the Chinese federal government. According to a very brief Renault press release on the joint venture, "With the support of both Dongfeng Motor and the Renault-Nissan Alliance, stakeholders of both sides will push forward close cooperation in every sector, notably research and development, purchasing, manufacturing, and marketing."
2013-09-24
Article
Renault unveiled the Initiale Paris concept at Frankfurt, designed as a replacement model for the Renault Espace and also to show Renault’s thinking for future high-end vehicles.
2013-04-18
Article
Leoni AG, a wiring systems supplier, describes competitiveness of aluminum wiring with enhanced corrosion protection of joints. Shows preformed harnesses that simplify assembly line installation. Describes thermal protection systems for these harnesses, and calls them production-ready.
2013-04-08
Journal Article
2013-01-1719
Olivier Laget, Cyprien Ternel, Julien Thiriot, Sébastien Charmasson, Pascal Tribotté, Fabrice Vidal
The target of substantial CO₂ reductions in the spirit of the Kyoto Protocol as well as higher engine efficiency requirements has increased research efforts into hybridization of passenger cars. In the frame of this hybridization, there is a real need to develop small Internal Combustion Engines (ICE) with high power density. The two-stroke cycle can be a solution to reach these goals, allowing reductions of engine displacement, size and weight while maintaining good NVH, power and consumption levels. Reducing the number of cylinders, could also help reduce engine cost. Taking advantage of a strong interaction between the design office, 0D system simulations and 3D CFD computations, a specific methodology was set up in order to define a first optimized version of a two-stroke uniflow diesel engine. The main geometrical specifications (displacement, architecture) were chosen at the beginning of the study based on a bibliographic pre-study and the power target in terms.
2013-02-25
Article
Although German carmakers express concern over R-1234yf safety, others remain nominally committed. But work on AC6 blend (R-445A) continues, and R-744 (carbon dioxide as a refrigerant) is back in the picture. The industry also faces preparation for challenges from new EPA AC17 drive cycle that measures A/C fuel consumption for future CAFE credits.
2012-06-13
Journal Article
2012-01-1523
Louis HUMBERT, P. Pellerey, S. Cristaudo
RENAULT aims to become the first full-line manufacturer putting to market zero-emission affordable electrical vehicles and is therefore developing 100 % electric powertrains. NVH problems related to electric machine design have nothing in common with those of gasoline or diesel engines: electric whistling is a high frequency harmonic phenomenon, easily detectable due to the low background noise of a non-thermal vehicle and mainly perceived as very unpleasant by the customer. Therefore we have developed a coupled numerical simulation between electromagnetic and structural models, making it possible to understand the influence of magnetic parts design on noise and vibration level. Impact of the spatial and time coherence between magnetic pressures and vibration modes of the motor will be explained. The novelty of our approach is to already take into account the whole powertrain structure radiation, including reducer and power supply boxes.
Viewing 1 to 30 of 121

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