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Viewing 1 to 30 of 3403
2015-10-27 ...
  • October 27, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
This seminar is designed to provide gear novices with a general understanding of gear nomenclature, geometry, and arrangements. Starting with the basic definition of gears, conjugate motion and the "Laws of Gearing", you will gain a solid understanding of gearing and the fundamentals of rotary motion transfer through gear-trains. Gear classifications, tooth forms and geometry, and very high-level application considerations, manufacturing processes, and inspection techniques will be covered. Attendees will receive a copy of the book, Gear Design Simplified, by Franklin D. Jones & Henry H. Ryffel.
2015-04-29
Event
2015-04-23
Event
This session deals with the automotive transmissions of different types. It includes development of new transmission concepts, transmission enhancements and the advancement of the state of the art of transmission system design & integration with the objective of improving the transmission efficiency, NVH, durability and shift pleaseability.
2015-04-22
Event
This Session includes papers on IVT/CVT systems and related topics.
2015-04-22 ...
  • April 22-24, 2015 (8:30 a.m. - 4:30 p.m.) - Detroit, Michigan
  • September 23-25, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Attendees to the seminars held in conjunction with the SAE 2015 World Congress will receive COMPLETE access to Congress activities for only $55 per day. If interested, please contact our Customer Service department at +1.877.606.7323 (U.S. and Canada only) or +1.724.776.4970 (outside U.S. and Canada) to register for this special Congress daily rate. Starting with a look at the transmission's primary function -- to couple the engine to the driveline and provide torque ratios between the two -- this updated and expanded seminar covers the latest transmission systems designed to achieve the most efficient engine operation.
2015-04-21
Event
This session covers transmission and driveline controls. Session will cover topics related to controls hardware, controls software, and controls integration.
2015-04-21
Event
This session focuses on modelling the performance of complex engine systems through consideration of mechanical, fluid, and thermal effects.
2015-04-21
Event
Powertrain Electronics play a key role in meeting today's complex emissions and performance requirements, on-board diagnostics, legislated regulations, and product flexibility. This session will explore the challenges and future prospects for powertrain controls. Papers are sought in the areas of on-board diagnostics, integration with transmissions, flash programming, service, software design and development, unit and system test, and electronics architecture today and in the future.
2015-04-20 ...
  • April 20-21, 2015 (8:30 a.m. - 4:30 p.m.) - Detroit, Michigan
  • October 14-15, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Attendees to the seminars held in conjunction with the SAE 2015 World Congress will receive COMPLETE access to Congress activities for only $55 per day. If interested, please contact our Customer Service department at +1.877.606.7323 (U.S. and Canada only) or +1.724.776.4970 (outside U.S. and Canada) to register for this special Congress daily rate. An efficient, robust, and quiet running drivetrain is as essential to customer satisfaction as styling and interior creature comforts. In this seminar, you will be exposed to various methods that can be used to accomplish this goal.
2015-04-15
Event
2015-04-14
Technical Paper
2015-01-1132
Jiaxing Zhan, Mohammad Fard
Preventing the backdriving and controlling the position stability of gearbox are critical tasks in some precision machineries and instruments. Consequently, many self-locking mechanisms have been developed to stabilize the rotation accuracy in gearing system. However, these assistant devices could enlarge the volume of gearbox, increase the complexity of transmission system and introduce more errors between gear pairs. Therefore, alternative methods are required to achieve design requirement without adding any extra electric or mechanical device. As a novel gear designed with anti-backdriving capacity, the self-locking gear has been of great interest to researchers and engineers to date. The self-locking gear can be used to prevent either the inertia driving, or backdriving, or both, when the driving torque is suddenly reduced as a result of power off, torsional vibration, power outage, or any mechanical failure at the transmission input side.
2015-04-14
Technical Paper
2015-01-1130
Sergei Aliukov, Andrei Keller, Alexander Alyukov
Overrunning clutches are devices for transmitting rotary motion in one direction only. These mechanisms are widely used in automotive industry, for example, in torque converters, impulse stepless transmissions, inertial continuously variable transmissions, starter engine starting system, and in other similar devices, where torque transmission is performed only in one direction. There are many different designs of the overrunning clutches, for example, ball, roller, cam, ratchet, spring ones, etc. But despite such a variety of designs and great efforts to establish reliable overrunning clutches, these mechanisms are still the weakest parts of many drive systems. Therefore, creation of reliable overrunning clutches is an urgent problem of mechanical engineering. Unfortunately, existing designs of the overrunning clutches have insufficient reliability and durability, which in many cases limits reliability of drive as a whole.
2015-04-14
Technical Paper
2015-01-1123
Jiangwu Zhang, Donghao Liu, Haisheng Yu
Torsional vibrations of the full hybrid electric vehicle driveline with a novel single-mode power-split transmission are investigated, in which three power sources, internal combustion engine (ICE), motor/generator 1 (MG1) and motor/generator 2 (MG2) are equipped. The compound planetary gear unit inside the transmission provides the driveline output with continuously variable gear ratios and serves as a power splitting device. Though very similar in configuration, the compound planetary gear used herein is a novel variation of Ravigneaux planetary gear set. MG1, MG2 and ICE are connected to the small sun gear (S1), the large sun gear (S2), the planetary carrier (C), respectively. The ring gear (R) is connected to the final reduction gear (FR), outputting tractions by the conventional differential (DF) to the right and left half shafts for the front wheels.
2015-04-14
Technical Paper
2015-01-1102
Katsuhiko Ohishi, Toshihiro Uehara, Ichirou Kishigami
In recent years, fuel economy improvement of automobiles is required to reduce emissions of carbon dioxide (CO2) which is a greenhouse gas and is well known as one of the factors of global warming. Therefore, continuously variable transmissions (CVT) have been used increasingly, because they are light, compact and contribute to better fuel consumption. Metal belt CVTs are the most popular system in use today. 18mass%Ni maraging steel is used for CVT belts because it has good weldability, good formability and high fatigue strength. Maraging steels strengthened by Ti have high fatigue strength, but TiN particles, which are the main non-metalic inclusions inside steels, might cause fatigue cracks in high cycle regions over 107 cycles. At present there is a special melting process to minimize TiN particle size, but we need further technological innovations to improve fatigue strength.
2015-04-14
Technical Paper
2015-01-1108
Hongqing Chu, Yong Chen, Lishu Guo, Bingzhao Gao, Hong Chen
Automated Manual Transmission is popularly used in microcars due to its small size, light weight, low cost and high efficiency. The dry clutch engagement is a very important control issue for AMT vehicles. The performance of dry clutch engagement must be guaranteed with the following different and sometimes conflicted goals: the shortest possible lock up time, the smoothest possible lock up process and the smallest friction losses during the slipping phase. A precondition for this complicated control issue is to obtain the information of road slope during the process of hill-start. The rapid development of sensing technology makes many semiconductor companies produced various kinds of MEMS (Micro-Electro-Mechanic System) sensors. Slope sensor is already applied in some ESP (Electronic Stability Program) vehicles which equipped with hill parking aid system.
2015-04-14
Technical Paper
2015-01-1101
Jun Hakamagi, Tetsuya Kono, Ryoji Habuchi, Naoki Nishimura, Masahiro Tawara, Naoki Tamura
As requirements for protecting the global environment are being heightened on a worldwide scale in recent years, the development of fuel-economy technologies in order to reduce CO2 emissions is an important issue for the automotive industry. Aiming of improving fuel economy, TOYOTA has developed a new belt-type continuously variable transmission (CVT), unit K114, for 2.0-liter class vehicles. The CVT has adopted various technologies fuel economy such as a coaxial 2-discharge port oil pump system, wider ratio coverage, flex lock-up control,and so on. Notably, a start-stop system, which makes the engine stop automatically while the vehicle stopping with “D” range to reduce wasting the energy, is compatible with the CVT with higher quality and lower cost. In addition, the CVT has been also worked on improving quietness by adopting new soundproofing cover and by revising the arrangement of the steel belt elements in order to reduce the vibrator force which generates the belt noise.
2015-04-14
Technical Paper
2015-01-1127
Wenbin Liu, Gangfeng Tan, Xiaoqing Tian, Zhiqiang Hu, Yuanqi Gao, Zhi Li, Junyi Yuan, Wei Liu
As a kind of an important auxiliary brake of heavy vehicle, hydraulic retarder has good performance for stability and braking sustainability. However, the hydraulic retarder is filled with air when the vehicle is traveling in non-braking state, and the Air-friction may reduce the vehicle transmission efficiency obviously.   The air density in retarder cavity can be decreased by pumping the gas, which can reduce the transmission power loss. The gas pumping in retarder cavity has an important influence on the retarder working stability. Firstly, the dynamic characteristics relationships between the vacuum degree and the change of flow resistance in retarder cavity are analyzed by the 3D fluid simulation in different driving conditions, and the stability boundary conditions of the Air-friction change is determined.
2015-04-14
Technical Paper
2015-01-0228
Francesco Braghin, Francesco Salis
An innovative low cost active gear-shift and clutch for Formula Student cars is designed and produced. Racecars require extremely quick gear-shifts and every system to be as light as possible. The proposed solution has been designed to reduce energy consumption, weight and improve gear-shift precision compared to an electro-hydraulic solution although keeping state of the art performances. This could be easily obtained with DC electric motors, System modeling, regulator design, based on PI-control, and simulation were carried out. Electronics, both signal and power, micro-controller based design and program coding, written in C language, were the next steps. Data from the working system mounted on the car were acquired, in order to verify the validity of the design choices. The solution has proven to satisfy the requirements with 20 ms shifting time and reduced weight (2 kg), energy consumption and system complexity.
2015-04-14
Technical Paper
2015-01-1120
Siddhartha Singh, Sudha Ramaswamy
Driving comfort is very important selling factor in today’s automobile market. Manual Transmission Clutch systems has to balance between driving control given to the driver and driver comfort.If ergonomics of ABC pedals are not taken care, driving stress will increase. The increase in engine torque because of change in technologies like turbocharging and pressure injection has also increased the release load for actuating clutch which in turn increases pedal load. There are many assistance mechanisms integrated with pedal to reduce the load like over-center spring, double torsion spring, each with its own limitations.
2015-04-14
Technical Paper
2015-01-1109
Yulong Lei, Ke Liu, Yao Fu, Ge Lin, Bin Song
This investigation presents a methodology to develop and optimize shift process control strategy to improve shift quality as perceived by drivers during power-on upshift events for Dual Cultch Transmission (DCT) vehicles. As part of the first study, the main factors affecting shift quality during shifting process under typical working conditions are analyzed. And taking the power-on upshift as example, dynamic model of DCT shifting process is build. An Integrated control strategy is proposed for power on upshift, which during torque phase slipping revolving speed controller is adapted to harmonically control two clutches power switching process, and during Inertial phase engine torque is regulated to synchronize with target gear while holding the oncoming clutch pressure. Oncoming oil pressure gradient in torque phase and engine torque reducing target quantity in inertial phase are chosen as controlled quantity.
2015-04-14
Technical Paper
2015-01-0517
Masaaki Kawahara, Noriaki Katori, Tatsuya Koyama
Reduction of fatigue and improvement of drivability have been required in commercial vehicles and automated manual transmissions are widely used. Further reduction of shifting time results in faster collision and slide between chamfers of sleeve and dog gear, and wear of chamfers increases. In this study, mechanism of the wear was clarified and a machine to evaluate the wear by test piece Base was developed. Using this machine, materials to improve the wear resistance were developed. It was found that addition of B and Ti-Nb had significant effect in the improvement of wear resistance. The developed material showed 45 % reduction in wear in transmission durability test.
2015-04-14
Technical Paper
2015-01-0978
Lori Lemazurier, Neeraj Shidore, Namdoo Kim, Ayman Moawad, Aymeric Rousseau, Phillip Bonkoski, Jeremy Delhom
Near term advances in SI engine technology (VVL, GDI, cylinder deactivation, turbo downsizing) for passenger vehicles hold promise of significant fuel savings in the vehicles of the immediate future. Similarly, trends in transmissions indicate higher gear numbers (8 speed, 9 speed), higher spans and a focus on down-speeding to improve engine efficiency. Dual clutch transmissions exhibit higher efficiency than the traditional automatics, and are being introduced in the light duty vehicle segment worldwide. Another development with low investment and immediate benefits has been the adaptation of start-stop (idle engine stop) technology in vehicles today. This paper evaluates the impact of each of these technologies (engines, transmissions, start stop) on the fuel economy and performance of a compact car in the year 2020 through the use of vehicle system simulation.
2015-04-14
Technical Paper
2015-01-1113
Jae Sung Bang, Young-Kwan Ko, Tae-Hee Jung
In this paper, we consider the driveline oscillation problem for electric vehicles. The research is motivated by the fact that the driveline oscillation should be eliminated because the oscillation has a bad effect on the ride comfort of the electric vehicles. In contrast with the conventional vehicle which contains a torque converter at the automatic transmission, the driveline of the electric vehicles is the lightly damped system since the torque source, that is, the motor is directly connected to the driving wheel through the driveline. As a result, the magnitude of the oscillation of the electric vehicle is much bigger than that of the conventional vehicle and the residual oscillation lasts for long time. To solve the problem, we suggest the novel active damping control algorithm using the speed of the driving wheel which is directly connected to the motor.
Viewing 1 to 30 of 3403

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