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Viewing 1 to 30 of 3493
2017-04-04
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 explores the challenges and future prospects for powertrain controls, including 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.
2017-04-04
Event
This session includes papers on the full array of transmission and driveline related components.
2017-04-04
Event
This session covers transmission and driveline modeling, including topics related to transmission hardware, software, and system integration.
2017-04-04
Event
This session addresses transmission noise, vibration, rattle issues and design solutions.
2017-04-04
Event
This session covers transmission and driveline controls. Session will cover topics related to controls hardware, controls software, and controls integration.
2017-04-04
Event
This Session includes papers on IVT/CVT systems and related topics.
2017-04-04
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.
2016-11-30
Event
2016-11-16 ...
  • November 16-18, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
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. Current designs, the components and sub-systems used, their functional modes, how they operate, and the inter-relationships will be discussed. A manual transmission display will be used to explain ratios and how they function within the driveline.
2016-11-08
Technical Paper
2016-32-0021
Stephen Gurchinoff
Thermoplastic bearing materials are being used in automotive transmission architectures where higher pressures and velocities are driving innovation. The benefits thermoplastics offer are high PV capable materials suitable to reduce NVH, increase design freedom while reducing design space, thermal insulation, reduce coefficient of friction, and improve wear resistance when compared to needle bearings. Expanding on the success in automotive may allow for these types of materials to be evaluated in marine lower units, CVT’s, pumps, and other small engine applications
2016-11-08
Journal Article
2016-32-0036
Takamori Shirasuna, Ryoh Hatakeyama, Yukio Sakai
In recent years, the need is growing for a fuel efficiency enhancement of motorcycles equipped with Continuously Variable Transmissions (CVT), of which the vehicle sales volume is rapidly increasing in developing countries. To develop a vehicle with excellent fuel efficiency, a precise estimation of fuel economy is required at the beginning stage of a vehicle development. One of the indices that are used for evaluation of fuel economy of a vehicle is fuel economy to a predetermined test mode of driving (mode fuel consumption). One of the parameters that plays an important role for the mode fuel consumption calculations is pulley ratio of CVT. In rubber belt CVTs for motorcycles, their pulley ratio varies at every moment depending on the balance between the traveling resistance and thrust force applied to the sidewall of the belt. The state of this pulley ratio variation differs among vehicles and/or among CVT specifications.
2016-11-02
Event
2016-10-26
Event
This session deals with papers on automotive transmissions of different types, their enhancements and controls.
2016-10-17
Journal Article
2016-01-2205
Chris McFadden, Kevin Hughes, Lydia Raser, Timothy Newcomb
Hybrid drivetrain hardware combines an electric motor and a transmission, gear box, or hydraulic unit. With many hybrid electric vehicle (HEV) hardware designs the transmission fluid is in contact with the electric motor, and so some OEMs and tier suppliers have concerns about the electrical properties of automatic transmission fluids (ATFs). Lubrizol has conducted a fundamental research project to better understand the electrical conductivity of ATFs. In this paper we will present conductivity data as a function of temperature for a range of commercially available lubricants, including engine oils and gear oils, in addition to ATFs. All fluids, regardless of type, had conductivities in the range of 1E-8 to 1E-10 S/cm at 100oC and as such are good insulators with the ability to dissipate static charge. Next we will deconstruct one ATF to show the relative impact of the various classes of lubricant additives.
2016-10-17
Technical Paper
2016-01-2343
Mark Devlin, Darryl Williams, Michael Glasgow, Karen Hux, Aaron Whitworth, Timothy Cameron
Improving vehicle fuel efficiency is a key market driver in the automotive industry. Typically lubricant chemists focus on reducing viscosity and friction to reduce parasitic energy losses in order to improve automotive fuel efficiency. However, in a transmission other factors may be more important. If an engine can operate at high torque levels the conversion of chemical energy in the fuel to mechanical energy is dramatically increased. However high torque levels in transmissions may cause NVH to occur. The proper combination of friction material and fluid can be used to address this issue. Friction in clutches is controlled by asperity friction and hydrodynamic friction. Asperity friction can be controlled with friction modifiers in the ATF. Hydrodynamic friction control is more complex because it involves the flow characteristics of friction materials and complex viscosity properties of the fluid.
2016-10-17
Technical Paper
2016-01-2353
Kazunori Harima, Shinji Tsuchiya, Takuro Morino, Yuji Nagasawa
CVT belts are constructed with multiple elements and layered rings, and friction loss occurs between each parts. Due to belt geometry, a large belt friction loss occurs between the elements and the inner most ring. Therefore, to improve efficiency, it is effective to decrease the slip between the elements and the inner most ring. So, the torque transmitted is influenced by the slip between the elements and the inner most ring. When the slip is decreased, it is thought that the amount of torque transmitted by the ring change. For efficiency improvement, it is necessary to analyze the change of the torque transmitted by the ring due to the decrease of slip between the elements and the inner most ring, but to verify of the internal thrust force in the real load state is difficult because it is a phenomenon inside the belt.
2016-10-17
Technical Paper
2016-01-2311
Arun Prasath G, Saravanan Duraiarasan, R Govindarajan
Indian two wheeler market is one of the largest and highly competitive in the world. Indian scooter segment grows at a pace of around 30% YOY. The stiff competition among OEM’s to increase the market share with fuel efficient and high performance products pushes development and calibration engineers to burn the midnight oil to concoct innovative methods to design technology boosted product. Customer expectations are always high in terms of fuel economy, drivability and NVH. Due to higher level of complexity involved in CVT (Continuously Varying Transmission) engine, it is daunting task to optimize for achieving best of NVH characteristics along with Fuel Economy, drivability and reduced exhaust emission. This paper describes the experiment conducted during the development of 110cc CVT four stroke scooter engine. The development and calibration of this scooter was mainly based on real world usage pattern (RWUP).
2016-10-17
Technical Paper
2016-01-2356
Shaopeng Tian, Geng Li, Tongliang Que
A set of test bench of manual transmission efficiency is designed,which is used to research the transmission efficiency of manual transmission in different working conditions. This paper introduces the basic structure and control principle of the test bench and analyzes the impact of the gearbox lubricating oil temperature and load on the transmission efficiency according to the measured data. The bench adopts two AC asynchronous motor to simulate the driving and load of the vehicle,the upper computer of test bench uses C++ to write the control program,the lower computer adopts PLC to control S120 Control cabinet which is used to adjust the speed of driving motor and the torque of load motor,the upper computer and the lower computer communicate through the OPC protocol.The bench collects experimental data signal and outputs the corresponding control signal by NI PCI-6221 data acquisition card.
2016-10-17
Technical Paper
2016-01-2357
Onkar P. Gurav, Santosh Deshmane
Globalization has intensively driven focus of car manufacturers on comfort and ergonomics. Luxuries are becoming essential features of product mix. Customer’s expectations and desires are changing because of cut throat competition and increasing variety of options. In order to sustain in marketplace OEM has to be competitive while providing features and options with appropriate quality. Vigorously changing dimensions and definitions of comfort level, luxury and aesthetics driven the intense focus of OEM’s on customer touch points, customer touch points are those components of vehicle which customer accesses while driving the vehicle and they play vital role in generating drive feel of vehicle. Customers drive feel about the vehicle is most complex and critical factor and is of subjective nature. Now days drive feel is an important aspect of product differentiation. Gear shift feel is very crucial touch point in overall drive feel of vehicle.
2016-10-17
Technical Paper
2016-01-2206
Darryl Williams, Jeffrey Guevremont, John Perry
Abstract Good shift quality in automatic transmissions is important for fuel efficiency, driver comfort, and performance. Maintaining this performance over the life of the vehicle is also important. Typically lubricant development focuses on reducing viscosity and friction in order to reduce parasitic losses. In an automatic transmission other factors are also important for good performance, primarily due to the shifting clutches and the torque converter clutch. A high level of friction is desirable for torque capacity and a steady decrease in friction as sliding speed (rpm) decreases is necessary for both good shift feel and good friction system durability over the lifetime of the vehicle. Changes in the friction system over time that result in a lowering of the friction level, particularly at higher sliding speeds, compromise the performance of both types of clutches.
2016-10-17
Technical Paper
2016-01-2207
Elizabeth Schiferl, Timothy N. Hunt, Robert Slocum
Abstract With government mandates, original equipment manufacturers are increasingly focusing on fuel economy and finding efficiency gains throughout the vehicle. Lubricant companies have been asked to design fluids that aid in this effort. Demonstrating real gains becomes complex given the intricacies of these systems and methods range from bench top screen tests to component test stands to full vehicle testing. This paper addresses the variation that was encountered when testing automatic transmission fluid efficiency within a full vehicle test. While it is well known that variability in testing conditions such as engine load or vehicle speed will lead to variability in results, the magnitude of their impact on average throughout the test cycle suggests that repeat testing may not be sufficient to guard against improper conclusions.
2016-10-05
Event
2016-09-27
Technical Paper
2016-01-8069
MahendraMohan Rajagopal, Suresh Kumar N, Nageshwara Rao P
Abstract In any drive system, tooth mesh misalignment originates primarily from its torque transmitting components such as spline connections, gears, shafts, bearings and housing. The major influencing factors for tooth mesh misalignments are clearance between components, deflection, stiffness, thermal expansion, manufacturing limitations and assembly limitations. Tooth mesh misalignments in heavy duty off-highway applications like tractor, propagates drastically while handling severe loads and tends to shift the load distribution in a gear pair to an un-biased manner along the facewidth, resulting in high contact stresses and poor transmission performance. Misalignments definitely add few more decibels to the driveline system which will be an annoyance to the user. Moreover, mesh misalignments in any drive system cannot be eliminated and hence different approaches and methods were followed to compensate the misalignment.
2016-09-27
Technical Paper
2016-01-8067
Suresh Kumar Kandreegula, Kamal Rohilla, Gaurav Paliwal, Naveen Sukumar, Naveen Pratap Tripathi
Abstract Three on the tree, four on the floor. The gear change mechanism is a component that is too often taken for granted but it is one of the more important features of the vehicle. It must be quick and smooth in action, efficient and totally reliable. Modern driving conditions demand that the driver makes frequent gear changes and a mechanism that is temperamental or inaccurate can be both frustrating and dangerous as well as physically tiring. The gear changing mechanism starts, quite obviously, with the gear lever. Most stem from the fact that a gear lever must move in two planes, forward and back and then from side to side to move across the gear "gate". A good many drivers think of gear changing as one simple action. This is more a tribute to the design of gear changing mechanisms than a reality. There are multiple gear selector mechanisms that are available for use in commercial vehicle industry.
2016-09-27
Technical Paper
2016-01-8080
Yanwu Ge, Ying Huang
Abstract The ever-growing number of interacting electronic vehicle control systems requires new control algorithms to manage the increasing system complexity. As a result, torque-based control architecture has been popular for its easy extension as the torque demand variable is the only interface between the engine control algorithms and other vehicle control systems. Under the torque-based control architecture, the engine and AT coordinated control for upshift process is investigated. Based on the dynamics analysis, quantitative relationship between the turbine torque of HTC and output shaft torque of AT has been obtained. Then the coordinated control strategy has been developed to smooth the torque trajectory of AT output shaft. The designed control strategy is tested on a powertrain simulation model in MATLAB/Simulink and a test bench. Through simulation, the shift time range in which the engine coordinated control strategy is effective is acquired.
Viewing 1 to 30 of 3493

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