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Viewing 31 to 60 of 109758
2017-03-28
Technical Paper
2017-01-0728
Jeremie Dernotte, John Dec, Chunsheng Ji
For lean/dilute and well-mixed gasoline compression-ignition engines, creating a partially stratified fuel mixture before auto-ignition can be beneficial to reduce the heat-release rate and the corresponding maximum rate of pressure rise. As a result, partial fuel stratification (PFS) can be used to increase load and/or efficiency without excessive ringing (i.e. without knock). In this work, a double direct-injection (D-DI) strategy is investigated for which the majority of the fuel is injected early in the intake stroke to create a relatively well-mixed background mixture, and the remaining fuel is injected in the latter part of the compression stroke to produce greater fuel stratification prior auto-ignition. Experiments were performed in a 1-liter single-cylinder engine modified for low-temperature gasoline combustion (LTGC) research.
2017-03-28
Technical Paper
2017-01-0653
Francesco Catapano, Silvana Di Iorio, Ludovica Luise, Paolo Sementa, Bianca Maria Vaglieco
Ethanol is one of the most suitable alternative fuel for spark-ignition (SI) engines. Its properties such as the higher evaporation heat and octane number as well as the larger oxygen content allow to obtain positive effect on engine performance and on particle formation and emissions. This paper aims to analyze the effect of different methods of ethanol fueling on in-cylinder soot formation and exhaust emissions in a small displacement spark ignition engine. The engine was fueled with gasoline and ethanol. In particular, the ethanol was both blended with gasoline (E30) and dual fueled (EDF). In this latter case, ethanol was direct injected and gasoline was injected into the intake duct. For both the injection configurations, the same percentage of ethanol was supplied: 30%v/v ethanol in gasoline. The GPFI and GDI configurations were also performed as base case. The experimental investigation was carried out in 4-stroke small single cylinder engine.
2017-03-28
Technical Paper
2017-01-1729
Alex K. Gibson
In the increasing development of autonomous vehicles, advanced driver assistance systems play a vital role in the safety of the driver, surrounding vehicles, and pedestrians. The scope of this research is to explore the methods of recognition used to detect obstacles that a vehicle encounters. This includes, but is not limited to, road lines, stop signs, pedestrians, other vehicles, speed bumps, etc. Many challenges are presented as the importance of the visual identification becomes more ubiquitous. For example, when conditions are less than ideal, such as heavy rain, snow, or fog, the approach to ground truth recognition becomes much more difficult. This can be achieved by creating a dynamic system that evaluates the change in luminance and/or ground truth and determines the vanishing point of the current ground truth recognized. These methods cannot be achieved without the fundamental techniques of visual processing.
2017-03-28
Technical Paper
2017-01-1733
Park Watanawongskorn
A variety of successful research on Palm Methyl Ester or Biodiesel reveals that Biodiesel contributes substantial reduction of Particulate Matters (PM) emitted from Compression Ignition (CI) engines due to the impact of effective oxygen function compared with commercial diesel. To reduce further PM emission, oxygenated fuel such as ethanol could be one of the possible options. This research will focus on the effects of ethanol on PM quantity and morphology by blending it with biodiesel. In the experiment, Ethanol will be blended with biodiesel (B100) with the blend ratio of 10%, 20%, and 30% by volume and then operated with a small CI engine in order to investigate PM development. Operating conditions will be divided into 0%, 20%, 40%, 60%, and 80% load of maximum torque. For each operating load, the engine speeds will be varied into 1600, 1800, 2000, 2200, and 2400 RPM.
2017-03-28
Technical Paper
2017-01-1736
Piyamabhorn Uttamung, Jenwit Soparat, Apichart Teralapsuwan, Wuttipong Sritham, Chi-na Benyajati
The energy storage is the main issue for an electric bus operating in the metropolis such as Bangkok. In order to provide a service of at least 200 km per charge and provide enough energy for air condition in bad traffic conditions, the batteries must be installed as many as possible on the bus. However due to an increased awareness to cater for disabled and elderly customers, a low-floor bus concept has been introduced in Thailand. As a result, an installation space in a lower area of the chassis was replaced with passenger seats. Therefore, remaining space for battery pack installation could be inside the passenger room and on the roof. However, the passenger room space would likely be reserved for more seat capacity. An installation of the battery packs on the roof was considered in this study. Such design could be considered unconventional especially in Thailand where such space would normally accommodate only the air condition unit.
2017-03-28
Technical Paper
2017-01-1735
Jenwit Soparat, Piyapong Premvaranon, Chi-na Benyajati, Jiravan mongkoltanatas
The energy storage is the main issue for an electric bus operating in the metropolis such as Bangkok. In order to provide a service of at least 200 km per charge and provide enough energy for air condition in bad traffic conditions, the batteries must be installed as many as possible on the bus. However due to an increased awareness to cater for disabled and elderly customers, a low-floor bus concept has been introduced in Thailand. As a result, an installation space in a lower area of the chassis was replaced with passenger seats. Therefore, remaining space for battery pack installation could be inside the passenger room and on the roof. However, the passenger room space would likely be reserved for more seat capacity. An installation of the battery packs on the roof was considered in this study. Since the energy storage of choice was Lithium-ion batteries, an adequate cooling of battery pack was essential for using in tropical climate during both charge and discharge.
2017-03-28
Technical Paper
2017-01-1738
Jen Chi Liao, Cheng-Yueh Wang
Diesel engines have significant contribution to the formation of particulate matter (PM) in metropolitan areas. Lot of researches have revealed that PM originated from diesel engine is carcinogenic and is closely related to lung cancers. Diesel engines used in trucks, buses, pickups, and automobiles have been regulated systematically with more and more stringent emission standards in the past thirty years. However, non road diesel engines are under much looser regulation. The reduction of PM for non road diesel engines becomes an important issue recently as most of the on road diesels are conformable to the strict standards. Emissions of diesel engines used in construction machinery were measured in real fields for real operations in this study. The variations of NOx concentrations and opacity were recorded in four different working modes, low idle, high idle, rapid acceleration, and partial load. It was found that opacity varied a lot in rapid acceleration.
2017-03-28
Technical Paper
2017-01-1740
Benjaporn Nakornpun
AC2A is a gravity cast aluminium alloy which has been widely used particularly in the automotive industry due to its good castability, weldability and pressure tightness. Even though aluminium gravity cast parts has less porosity trouble than those produced using other die casting processes, little porosity is still not allowed for automotive parts with safety requirement such as brake cylinder, fuel rail, oil pump housing, power steering valve box and clutch cylinder. This work aimed to investigate effects of cooling rate and melt treatment on porosity level of gravity casting AC2A aluminium alloy. Aluminium was performed by gravity casting method. Different mold material and degassing agent addition were used to obtain different controlled level of cooling rate and melt quality, respectively. The different mold was effected to cooling rate and porosity.
2017-03-28
Technical Paper
2017-01-1739
Worrapon Tamuang, Sutee Olarnrithinun, Yingyot Aue-u-lan
A forging process is a process used for producing automotive components such as power train components due to advantages of a high production volume and superior part’s strength. During repeated forging sequence, the forming dies are undergone high forming load which is normally closed to or higher than the yield stress of the die materials especially in the local area. That would be a major cause of a local fatigue crack formation and as a result limit life service of the forming dies. This type of the failure is known as a low cycle fatigue. Normally, the life service is less than 104. To improve the capability of the forging processes, the tool life needs to be known. Thus, to achieve reliable estimation of the tool life during the design, the material testing is required.
2017-03-28
Technical Paper
2017-01-0405
Tianqi Lv, Xingxing Feng, Peijun Xu, Yunqing Zhang
Several constitutive models which capture the amplitude and frequency dependency of filled elastomers are implemented for the conventional engine mounts of automotive powertrain mounting system (PMS). Firstly, a multibody dynamic model of a light duty truck is proposed, which includes 6 degrees of freedom (DOFs) for the PMS. Secondly, several constitutive models for filled elastomers are implemented for the engine mounts of the PMS, including nonlinear elastic model, frictional derivative viscoelastic model, general Maxwell chains, Coulomb-type friction, Berg’s friction model, common Kelvin-Voigt model etc. The nonlinear behavior of dynamic stiffness and damping of the mounts are investigated. Thirdly, simulations of engine vibration dynamics are presented and compared with these models and the difference between common Kelvin-Voigt model and other constitutive models are observed and analyzed.
2017-03-28
Technical Paper
2017-01-0214
Simon O. Omekanda, Rezwanur Rahman, Eric M. Lott, Sadek S. Rahman, Daniel E. Hornback
Designing an efficient transient thermal system model has become a very important task in improving fuel economy. As opposed to steady-state thermal models, part of the difficulty in designing a transient model is optimizing a set of inputs. The first objective in this work is to develop an engine compatible physics-based 1D thermal model for fuel economy and robust control. In order to capture and study the intrinsic thermo-physical nature, both generic “Three Mass” and “Eight Mass” engine model are developed. The models have been correlated heuristically using Simulink and Flowmaster, respectively. In order to extend the lumped mass engine model it also has been extended to Simulink model. In contrast to the complexity of the models the “Heuristic search” of input parameters has been found to be challenging and time consuming.
2017-03-28
Technical Paper
2017-01-1014
David Moyer, Roger Khami, Andrew Bellis, Thomas Luley
Engine Air Induction Systems Hydrocarbon Trap (HC Trap) Designs, to limit evaporative fuel emissions, have evolved over time. This paper discusses a range of HC Traps that have evolved in Engine Air Induction Systems. (AIS) The early Zeolite Flow through Hydrocarbon Trap utilized an exhaust catalyst technology internal stainless steel furnace brazed substrate coated with Zeolite media. This HC Trap was installed in the AIS Clean Air Tube. This design was heavy, complicated, and expensive but met the urgency of the implementation of the new evaporative emissions regulation. The latest Ford Motor Company HC Trap is a simple plastic tray containing activated carbon with breathable non-woven polyester cover. This design has been made common across multiple vehicle lines with planned production annual volume in the millions. The cost of the latest HC Trap Bypass design is approximately 5% of the original Stainless Steel Zeolite Flow Through HC Trap.
2017-03-28
Technical Paper
2017-01-1685
Gopal K. Chamarthi, Andrew Sarkar, Paul Baltusis, Mark Laleman
An average luxury car contains more than 50 sensors connected, to over 28 microprocessors, through multiple communication networks. What makes these complex machines diagnosable at a dealership, is the ability of sophisticated diagnostics algorithms. Besides use of diagnostics in service, diagnosing a failure is also key for functional safety and vehicle availability. Safety functions such as loss of Brake fluid and leaky fuel system are essential. Once a failure is detected, Vehicle availability functions allow vehicle to operate, so that one could reach the dealership without being stranded. The number of failure modes in a car could far exceed tens of thousands, thereby identifying key failure modes for developing diagnostics can be a challenge.
2017-03-28
Technical Paper
2017-01-0866
Edwin N. Quiros, Karl B.N. Vergel, Ernesto B. Abaya
This paper presents a preliminary study to estimate, using on-road and laboratory tests, the mileage range of liquefied petroleum gas (LPG) as an alternative fuel for diesel-fed public utility jeepneys in the Philipines. Data from the study would be used by the Philippine Department of Energy to formulate and implement alternative fuel programs for public transport. On-road fuel consumption and GPS speed data from selected in-use LPG and diesel jeepneys plying a chosen urban route were gathered to develop corresponding drive cycles for chassis dynamometer testing at 100% load factor were conducted to estimate an upper limit for fuel consumption. Measured on-road diesel jeepney mileage was about 6.7 km/liter at 63.5% load factor while that for LPG jeepney was 3.8-4.2 km/liter at 59.8% load factor. Chassis dynamometer tests yielded 5.1-5.6 km/liter for diesel and 2.6-3.1 km/liter for LPG.
2017-03-28
Technical Paper
2017-01-0876
Senthil Kumar Masimalai, Jai Kumar Mayakrishnan
Different methods to improve the performance of a WCO (waste cooking oil of sunflower based) mono cylinder compression ignition (CI) engine were investigated. A single cylinder direct injection diesel engine developing the power output of 3.7 kW was used. Initially the engine was tested with neat WCO as fuel. WCO was then converted into its emulsion by emulsification process and tested as fuel. In the second phase, the engine intake system was modified to admit excess oxygen along with air to test the engine with WCO and WCO emulsion as fuels under oxygen enriched environment. In the third phase, the engine was modified to work in the dual fuel mode with hydrogen being used as the inducted fuel and either WCO or WCO emulsion were used as pilot fuels. All the tests were carried out at 100% and 40% of the maximum load (3.7 kW power output) at the rated speed of 1500 rpm. Engine data with neat diesel and neat WCO were used for comparison.
2017-03-28
Technical Paper
2017-01-0873
Senthilkumar Masimalai, Jai Kumar Mayakrishnan, Natraj Ganesan
This paper presents a comprehensive study on using MO (mahua oil) as fuel effectively in a diesel engine by adopting emulsification and TBC (low heat rejection) techniques. A mono cylinder diesel engine was used for the study. Initially trials were made on the engine using neat diesel (ND), neat mahua oil (NMO) as fuels. In the second phase, NMO was converted into its stable emulsion (called as MOE) and tested in the engine. Finally thermal barrier coating of 0.2 mm was made on the piston, valves and cylinder head of the engine using the ceramic power of Al2O3 and the engine was tested using NMO and MOE as fuels in the TBC engine to improve the part load performance of the engine with MOE as fuel. Results indicated improvement in BTE (brake thermal efficiency) with MOE as compared to NMO mainly at high power outputs in the unmodified engine. The maximum BTE was found as 31.5% with ND, 27.2% with NMO and 30.4% with MOE at the peak power output.
2017-03-28
Technical Paper
2017-01-0869
Job Immanuel Encarnacion, Edwin Quiros
The Philippine Biofuels Act of 2006 (RA 9367) requires commercial diesel fuel to be mixed with Coconut Methyl Ester (CME) in accordance with the current drive of the Philippines stipulated in the Philippine Clean Air Act of 199 (RA 8749). As of 2015, the percentage should be at 5% CME v/v but this is contrary to the current percentage of commercial diesel which is still 2%. Researches done locally to show the performance and emissions of CME-fueled engines are few and thus the basis for increasing the CME percentage is still questionable. This hampers the drive for the further implementation of the policy. The influence of varying percentages of CME blends (2%, 5%, 10%, 15%, 20% v/v) to the performance and emissions of a heavy-duty turbocharged common rail direct injection (CRDI) engine is then determined using an engine dynamometer. The engine is run at steady state on a partial load (50Nm and 250 Nm) and near full load (500Nm).
2017-03-28
Technical Paper
2017-01-0878
Julia Carrell, Tom Slatter, Uel Little, Roger Lewis
The interaction of three bio-lubricant base oil candidates with seventeen combinations of surface treatment were studied, comparing wear scar volumes and coefficient of friction results. Substrates were initially ground or superfinished, a combination of Dymon-iC™ DLC, an ultra-fine shot blasting method doped with Tin and Molybdenum Disulfide, a calcium based chemical dip and nano fullerene, were used. DLC is a well reported to reduce frication and wear, some reports suggest wear in coated contacts is independent of the type of lubricant used, others report that bio-lubricants offer reduced friction and wear in combination with DLC. Shot blasting can also reduce wear and friction, dimples act as lubricant reservoirs, making hydrodynamic lubrication more likely. Work has also explored the performance of surface texturing in combination with coatings, some finding higher friction with surface texturing and DLC.
2017-03-28
Technical Paper
2017-01-0887
Dairene Uy, George Pranis, Anthony Morelli, Arup Gangopadhyay, Alexander Michlberger, Nicholas Secue, Mike Kinzel, Tina Adams, Kevin Streck, Michael Lance, Andrew Wereszczak
Deposit formation on the turbocharger compressor housing can lead to compressor efficiency degradation, which leads to loss of fuel economy and increase in CO2 and NOx emissions. To understand the role that engine oil composition and formulation play in these deposits which arise from oil aerosols and particulates from the closed crankcase ventilation, fIve different lubricants were run in a fired engine test to evaluate turbocharger compressor efficiency. Basestock group, additive package, and viscosity modifier treat rate were varied in the lubricants tested. After each test was completed the turbocharger compressor cover and backplate deposits were characterized. A laboratory oil mist coking rig has also been constructed, which generated deposits having the same characteristics as those from the engine tests. By analyzing results from both lab and engine tests, correlations between deposit characteristics and their effect on compressor efficiency were observed.
2017-03-28
Technical Paper
2017-01-0886
Liyan Feng, Ximing DI, Wuqiang LONG, Yao Wu, Chao Liu, Hang Lv
The combustion of cylinder lubricating oil is one of the major resources of PM emissions of low-speed 2-stroke marine engines. For pre-mixed gas engines, the auto-ignition of cylinder oil might result in knock or more hazard abnormal combustion — pre-ignition. The evaporation is a key process of the auto-ignition of cylinder oil droplets. The evaporation behavior has a profound impact on the auto-ignition and combustion processes of cylinder oil droplets. This paper applied a suspending apparatus to investigate the evaporation characteristics of cylinder oil droplets and base oil droplets. The effects of environment temperature and droplet diameter on the evaporation process were measured and analyzed. The results indicate that the evaporation of cylinder oil includes heating, evaporation, pyrolysis, and polymerization. Under high temperature conditions, the pyrolysis process caused the explosion of the oil droplets, and the evaporation curve appeared intensive waving.
2017-03-28
Technical Paper
2017-01-0903
Sarp Mamikoglu, Jelena Andric, Petter Dahlander
Many technological developments in automobile powertrains have been implemented in order to increase efficiency and comply with emission regulations. Although most of these technologies show promising results in official fuel economy tests, their benefits in real driving conditions and real driving emissions can vary significantly, since driving profiles of many drivers are different than the official driving cycles. Therefore, it is important to assess these technologies under different driving conditions and this paper aims to offer an overall perspective, with a numerical study in simulations. The simulations are carried out on a compact passenger car model with eight powertrain configurations including: a naturally aspirated spark ignition engine, a start-stop system, a downsized engine with a turbocharger, a Miller cycle engine, cylinder deactivation, turbocharged downsized Miller engine, a parallel hybrid electric vehicle powertrain and an electric vehicle powertrain.
2017-03-28
Technical Paper
2017-01-0932
Nehemiah S I Alozie, George Fern, David Peirce, Lionel Ganippa
ABSTRACT The use of diesel particulate filter (DPF) has become a standard after treatment technology in modern diesel engine however; pressure drop develops across the filter as PM accumulates. This requires quick periodic burn-out without incurring thermal runaway temperatures that could compromise DPF integrity in operation. Adequate understanding of soot oxidation is central to design and manufacture of efficient filter traps suitable for the engine system. In this study, we have examined the oxidation of PM generated from a high speed direct injection (HSDI) diesel engine, ran with 20% and 40% blends of two biodiesel fuels. The PM samples were collected on a Pall Tissuquartz filter during constant engine load and oxidised non-isothermally in a thermogravimetric analyser (TGA). Then results obtained are compared with PM oxidation data obtained from pure petrodiesel.
2017-03-28
Technical Paper
2017-01-0949
Makoto Ito, Mitsuru Sakimoto, Zhenzhou Su, Go Hayashita, Keiichiro Aoki
New two-A/F systems different from usual A/F-O2 systems are being developed to cope with strict regulation of exhaust gas. In the two-A/F systems, two A/F sensors are equipped in front and rear of a three-way catalyst. The A/F-O2 systems are ideas which use a rear O2 to detect exhaust gas leaked from three-way catalyst early and feed back. On the other hand, the two-A/F systems are ideas which use a rear A/F sensor to detect nearly stoichiometric gas discharged from the three-way catalyst accurately, and to prevent leakage of exhaust gas from the three-way catalyst. Therefore, accurate detection of nearly stoichiometric gas by the rear A/F sensor is the most importrant for the two-A/F systems. In general, the A/F sensors can be classified into two types, so called, one-cell type and two-cell type. Because the one-cell type A/F sensors don’t have hysteresis, they have potential for higher accuracy.
2017-03-28
Technical Paper
2017-01-1462
Haiyan Li, Xin Jin, Hongfei Zhao, Shihai Cui, Binghui Jiang, King H. Yang
Computational human body models, especially detailed finite element models are suitable for investigation of human body kinetic responds and injury mechanisim. A real-world lateral vehicle-tree impact accident was reconstructed by using finite element method according to the accident description in the CIREN database. At first, a baseline vehicle FE model was modified and validated according to the NCAP lateral impact test. The interaction between the car and the tree in the accident was simulated using LS-Dyna software. Patameters that affect the simulation results, such as the initial pre-crash speed, impact direction, and the initial impact location on the vehicle, was analyzed. The parameters were determined by matching the simulated vehicle body deformations and kinematics to the accident reports.
2017-03-28
Technical Paper
2017-01-0913
Evangelos Georgiadis, Toru Kudo, Olaf Herrmann, Ken Uchiyama, Juergen Hagen
In order to comply with emission regulation, reach their profitability targets and minimise the in-use cost of their vehicles, OEMs are seeking solutions to optimise their aftertreatment systems. For SCR system engineers, one of the most important challenges is to reduce the system's cost, while keeping its high level of NOx emission reduction performance. Ways to achieve this cost reduction include 1. using an engine out NOx estimation model instead of a NOx sensor upstream of the SDPF catalyst and 2. eliminating the Ammonia Slip Catalyst downstream of the SDPF catalyst. Achieving these challenging targets requires actions on the complete SCR system, from the optimisation of mixing and uniformity in the SDPF catalyst to the development of robust controls. To face these challenges, DENSO has developed a novel exhaust reverse flow concept, combined with a blade mixer, increasing mixing length and total mixing performance.
2017-03-28
Technical Paper
2017-01-0929
Satoru Inoda, Yasutaka Nomura, Hirotaka Ori, Yuji Yabuzaki
PN regulation including Euro6 will be scheduled / tightened worldwide for gasoline engine especially GDI(Gasoline Direct Injection) engine. To meet PN regulation with GDI engine, particle filter which is also utilized for a diesel engine is needed. There are two types of particle filters for gasoline engine (Gasoline Particulate Filter ; GPF). One is bare GPF (additional type) , the other is coated GPF (replaced type). "Replaced" GPF (coated GPF) has advantages of cost / space / pressure drop compare to “Additional" GPF (bare GPF). There are three key performances for coated GPF. Firstly, three way performance is equivalent or more than three way catalyst. Secondly, a low pressure drop which is not to affect engine power and fuel consumption. Finally, a high PN filtration efficiency to meet the PN regulations. ZONE coating technology which is utilized for three way catalyst is also effective for GPF to improve three way performance.
2017-03-28
Journal Article
2017-01-0418
Gregory McCann, Prashant Khapane
An increase in data measurement and recording within vehicles has allowed Anti-lock Braking Systems (ABS) to monitor a vehicles dynamic behavior in far more detail. This increased monitoring helps to improve vehicle response in scenarios such as braking whilst cornering and braking on uneven surfaces. Durability and Robustness (D&R) CAE department within Jaguar Land Rover discovered that the lack of a complex ABS system in virtual vehicle models was contributing to poor lateral and longitudinal loads correlation throughout the suspension and mounting systems. Last year the team started a project to incorporate Continentals ABS system, provided by '©Continental AG' for physical JLR vehicles, into SIMPACK virtual vehicles by means of a co-simulation. The work involved collaboration between 3 departments in Jaguar Land Rover and ultimately led to implementation of the ABS into the JLR wide virtual database.
2017-03-28
Journal Article
2017-01-0427
Yue Shi, Qingwei Liu, Fan Yu
1. Multi-body Dynamics Modelling of EV Prototype An EV prototype, with all the wheels independently driven by 4 in-wheel motors, is developed. In cooperation with Shanghai Motor Vehicle Inspection Center, the prototype undergoes a series of practical measurements and road tests. Based on the obtained vehicle parameters, a multi-body dynamics model is built by using SolidWorks and Adams/Car, and then validated by track test data. The virtual prototype is served as the control plant in simulation. 2. Adaptive FO-PID Controller Design In order to enhance the handling and stability performance of the EV, an adaptive FO-PID controller is designed. Considering the model uncertainties, e.g. changes in body mass and yaw inertial resulted from changed mass distribution, a Parameter Self-Adjusting Differential Evolution (PSA-DE) algorithm is adopted for tuning the controller parameters, i.e. Kp, Ki, Kd, λ and μ.
2017-03-28
Technical Paper
2017-01-0436
Tianjun Zhu, Bin Li
A new extending planar model for multi-axles articulated vehicle with nonlinear tire model is presented. This nonlinear multi-axles articulated vehicle model is specifically intended for improving the model performance in operating regimes where tire lateral force is near the point of saturation, and it has the potential to be applied to extend the specific axles model to any representative configuration of articulated vehicles model. At the same time, the extending nonlinear vehicle model can reduce the model's sensitivity to the tire cornering coefficients. Firstly A nonlinear tire model is used in conjunction with the 6-axle planar articulated vehicle model to extend the ranges of the original linear model into the nonlinear regimes of operation. Secondly the performance analysis of proposed nonlinear vehicle model is verified through the double lane change maneuver on different road adhesion coefficient using Trucksim software.
2017-03-28
Technical Paper
2017-01-0391
Daniel Meyer, Peter Maehling, Thomson Varghese, Jeffery Lewis
Precise and accurate internal-combustion engine pressure measurements are typically built upon extremely low level piezoelectric sensor signals acquired in the laboratory. In turn, these minute signals must be accurately conditioned using electronic charge amplifiers and then processed for meaningful analysis. Laboratory standard operating procedures often overlook the importance of timely and rigorous calibration of the equipment, or perform them without using sufficient environmental controls. In some facilities, years have been allowed to pass between metrology-quality calibrations, introducing the potential for significant out-of-tolerance conditions and non-compliance when compared to accredited measurement standards. Environmental, aging and operator factors influencing calibration metrology and in-use accuracy are presented in this paper, along with a method and example for estimating the calibration interval needed to specify calibration frequency for charge amplifiers.
Viewing 31 to 60 of 109758