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Viewing 1 to 30 of 3449
2016-10-24
Event
This session deals with papers on automotive transmissions of different types, their enhancements and controls.
2016-05-01
Journal Article
2015-01-9144
Marc-Olivier Lacerte, Gabriel Pouliot, Jean-Sébastien Plante, Philippe Micheau
Electric Vehicles (EVs) with single-ratio gearbox provide high levels of smoothness, but using multi-speed gearbox can provide significant benefits in terms of vehicle acceleration, top speed, powertrain cost, mass, and energy consumption. In particular, Automated Manual Transmissions (AMTs) have characteristics of smooth shifts without torque interruption when coupled to a torque bypass clutch. However, conventional friction clutches are not best suited as torque bypass clutches because of their limited controllability and because large amount of heat must be dissipated to slow down the motor during gearshifts. This paper studies the feasibility of a seamless AMT architecture for EVs and Hybrid Electric Vehicles (HEVs) using an eddy current torque bypass clutch that is highly controllable, robust, low cost, and has no wearable parts.
2016-04-12
Event
This Session includes papers on IVT/CVT systems and related topics.
2016-04-12
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.
2016-04-11 ...
  • April 11-13, 2016 (8:30 a.m. - 4:30 p.m.) - Detroit, Michigan
  • August 15-17, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • 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.
2016-04-05
Technical Paper
2016-01-1119
Prashant Jha
The Concept of Automatic Transmission is ubiquitous and ever increasing as they offer an ease of operation. Implementation of automatic Transmission in manual gear boxes however is relatively new. Based on Fuzzy Logic a Shift Schedule has been developed for Automatic Manual Transmission (AMT), to estimate various loads and resistances incurred by road Gradients and Loading conditions. A Shift Schedule has been designed in accordance with vehicle speed, road loads and throttle valve opening. This will ultimately result in an automatic gear box with improvement in shift quality and prudent Gear shift irrespective of rider competence. This Shift Schedule control method significantly reduces Gear hunting at variable gradients and at different loading conditions.
2016-04-05
Technical Paper
2016-01-1109
Okumura Naotoshi
Transmission structure and specifications ・Technology for transmission efficiency improvement ・Development of new control to improve drivability A new generation CVT with auxiliary gear box has been developed and started to be sold in the market. It has wider ratio coverage than previous generation and lower friction realized by several technologies, such as hydraulic control system improvement, oil pump loss reduction, friction reduction of ball bearing with seal , and some other technologies. Ratio shifting control and auxiliary gear box shifting control has been improved and newly developed controls are also introduced together with torque converter lock up clutch control improvement . Those new controls improved vehicle drivability and performance. In this presentation, the outline of the new generation CVT with auxiliary gear box will be explained and topics of new technologies will also be highlighted.
2016-04-05
Technical Paper
2016-01-1107
Jing Yuan
The belt clutching CVT drive has been developed for the scooter application. It utilizes the belt as a clutching mechanism instead of the traditional centrifugal clutch that is commonly employed in conjunction with the driven clutch of the drive train. By eliminating the centrifugal clutch, 48% mass reduction of the driven clutch has been achieved as well as cost saving. By placing the belt clutching directly at the engine crankshaft, fast throttle response and better vehicle acceleration/deceleration have been attained. The belt clutching mechanism demands a better performance belt to withstand the additional clutching induced wear and tear. The newly developed carbon cord belt, G ForceTM C12, meets the challenge. The common edge cord pull-out failure mode is eliminated, and the overall wear is improved. An analytical program PTWork has been developed and proven to be instrumental in integrating CVT clutch hardware with the CVT belt.
2016-04-05
Technical Paper
2016-01-0431
Guangqiang Wu, Huwei WU, Xiang Chen
During the process of vehicle creeping, severe vibro-impacts of unloaded or lightly loaded gear pairs in a manual transmission may occur in the powertrain system due to some nonlinear characteristics. Multi-staged stiffness clutch damper, as a main nonlinear component, could have a great influence on powertrain system torsional vibration performance. So a mass-production passenger sedan is taken as the research subject and the nonlinear characteristics impact of multi-staged stiffness clutch damper for vehicle creeping vibration is investigated by using lumped-parameter modeling method. Firstly, a quasi-transient model of an inline four-cylinder and four-stroke engine, based on measured data of cylinder gas pressure versus crankshaft angle, is derived. Effective output torque is achieved and as the input excitation to the driveline. Secondly, a 12 DOFs (Degrees of Freedom) nonlinear and branched torsional vibration model is established.
2016-04-05
Technical Paper
2016-01-1138
Amit Sandooja, Saurabh Ghugari
Transmission is one of the critical components of automobile and directly related to performance, riding comfort and safety of the vehicle. Gear shift performance is the most important evaluation index of transmission and always concerns transmission design and improvement. The essential criterions for the operating quality of gear shifting are shift force and travel during gear shift in static and dynamic condition of vehicle. The gear shift mechanism plays an important role between the driver and the vehicle. Since the gear shift force applied by the driver, is transmitted from gear shift lever to the synchronizer sleeve by gear shift mechanism, the design parameter of shift mechanism affect the shifting quality of manual transmission. The maximum resistance is the synchronizing force during synchronization phase, therefore the synchronizer is often blamed as the cause of gear shift quality issue. This is not always the case.
2016-04-05
Technical Paper
2016-01-1118
Yanwu Ge, Ying Huang, Gang Li, Meng Xia
Under the torque-based control architecture, the engine and AT (automatic transmission)coordinate control for upshift process is investigated. Based on the dynamics analysis, quantitative relationship between the turbine torque of HTC (hydrodynamic torque converter) and output shaft torque of AT has been obtained. Then the coordinate control strategy has been developed to realize the torque trajectory of AT output shaft. The designed control strategy is tested on a powertrain simulation model and a test bench. Through simulation, the shift time range in which the engine control strategy is effective is acquired. The experimental results show that torque response of the diesel engine with electronic unit pump can meet the requirements of coordinate control and the developed coordinate control strategy can reduce the output torque fluctuation and improve the shift quality apparently.
2016-04-05
Technical Paper
2016-01-1142
Andrew Moskalik, Aaron Hula, Daniel Barba, John Kargul
In preparation for the midterm evaluation (MTE) of the 2017-2025 light-duty GHG emissions rule, the Environmental Protection Agency (EPA) has refined and revalidated their Advanced Light-Duty Powertrain and Hybrid Analysis (ALPHA) tool using newly acquired data from model year 2013-2015 engines and vehicles. ALPHA is a physics-based, forward-looking, full vehicle computer simulation capable of analyzing various vehicle types with different powertrain technologies, showing realistic vehicle behavior, and auditing of all internal energy flows in the model. As part of the validation of ALPHA, the EPA obtained model year 2014 Dodge Chargers equipped with 3.6 liter V6 engines and either a NAG1 five-speed transmission or an 845RE eight-speed transmission. Examples of each vehicle were tested on a chassis dynamometer, with eight-speed vehicles averaging 6.5% reduction in unadjusted combined city-highway CO2 emissions over five-speed vehicles.
2016-04-05
Technical Paper
2016-01-1127
Enrico Galvagno, Guido Ricardo Guercioni, Alessandro Vigliani
This paper presents a methodology for the assessment of the NVH performance of a DCT depending on some transmission design parameters, e.g. torsional backlash in the synchronizers, clutch disk moment of inertia, etc., during low vehicle speed maneuvers. Firstly, a 21-DOFs nonlinear dynamic model of a C-segment passenger car equipped with a DDCT is presented. From the torsional variables computed during simulation, the forces at the bearings that support the transmission shafts are calculated; both the axial and radial component of each bearing force are estimated through the model. It has been noted that an impact between the teeth of two engaging rotating components, e.g. gears and synchronizers, corresponds to an impulse in the simulated forces, which leads to a bearing force time-history characterized by a very rich frequency content. A broad band excitation is therefore applied to the gearbox case thus generating noise and vibration issues.
2016-04-05
Technical Paper
2016-01-1378
TAKANORI IDE, Kentaro TODA, Yasunori Futamura, Tetsuya Sakurai
Efficient method to solve large-scale eigenvalue computation in vibration is presented. NVH(Noise, Vibration and Harshness) performance is an important quality measure of the vehicle. Therefore the reduction of vibration is one of the key considerations of new automatic transmission design. In addition, accelerating product design time is another important issue. Computer Aided Engineering (CAE) is becoming a more important methodology to reduce product design time. However computational time of eigenvalue problem takes a long. We propose parallel eigenvalue computation (Sakurai-Sugiura method) for large-scale eigenvalue problems. This method has a good parallel scalability according to a hierarchical structure of the method. As a demonstrative problem, we consider large-scale eigenvalue computation of the AISIN AW FWD automatic transmission.
2016-04-05
Technical Paper
2016-01-1110
Toshinari Sano, Masashi Inoue, Fumihiro Itoigawa
In this report, for the purpose of advancing the estimation accuracy of maximum traction coefficient, we improve the temperature estimation model in the contact portion and verify it by measurement. Traction drives have been developed such as a continuously-variable transmission component for motor vehicles. The contact portion between the rolling elements mutually transmits power and always in a state in which oil film is formed. The oil film is solidified and sheared in high pressure GPa units, and also affects its own shear properties by the heat generation temperature rise. It can be said that the most important factor in estimating the traction power transmission capability is a temperature of the contact portion. The authors have already proposed the calculation method of maximum traction coefficient, in which the inside of the contact ellipse was represented by a simple combination of viscous-plastic model.
2016-04-05
Technical Paper
2016-01-0422
Robert A. Smith, Christopher Rudzinskas
“Molecular Analysis of Automotive Electrical Components Contaminated with Engine and Powertrain Performance Fluids” Robert A. Smith and Christopher R. Rudzinskas, Advanced Materials Group, Delphi Electrical/Electronic Architecture, Warren, Ohio Increased government regulations for increased fuel efficiency to combat rising fuel costs and environmental concerns has led to marked reduction in the size of cars. Automobile downsizing has reduced engine compartment volumes - decreasing separation of polymeric electrical components from fluid accesses and reservoirs and increasing the risks of spillage onto the components. The spatial separation has been reduced even further with trends toward high performance turbo-charged engines with enhanced automotive performance. Once contaminated, the polymeric component is then exposed to heating, due to engine performance, which could exacerbate fluid contamination into the interior of the part through imbibition into amorphous regions.
2016-04-05
Technical Paper
2016-01-1097
Satoshi Fukuyama, Tomohide Suzuki, Akira Murata, Hiroshi Mizoguchi, Toshihiko Kamiya
Aisin AW has developed a new RWD 6 speed automatic transmission, AWR6B45-Ⅱ, suitable for SUV and LDT in worldwide market, not only for North America but also for other countries including emerging nations. This 6 speed automatic transmission has achieved low cost equivalent to our current 5 speed automatic transmission while realizing improvement in both fuel economy and driving performance against our current 5-speed and competitor’s 6-speed automatic transmission, in addition to satisfy both toughness against various usage and light weight/compactness. They are accomplished by using the compact gear train structure, the latest efficiency improvement technologies and the high-response compact hydraulic control system. In addition, the compactness of this 6 speed automatic transmission enables it to replace current 4 speed and 5 speed automatic transmissions for various engine application.
2016-04-05
Technical Paper
2016-01-1358
Jerry Lai, Youssef Ziada, Juhchin Yang
During the planetary gear assembly, staking is a widely-used method for affixing pinion shafts into the position. A reliable staking process not only prevents the movement of the shaft during transmission operation, but also minimizes the distortion of the assembly due to the staking process. The quality of staking operations is determined by the component designs, the process parameters, and the staking tool geometry. It would be extremely time-consuming and tedious to evaluate these factors empirically; not to mention the requirement of prototypes in the early stage of a new program. A Non-linear Finite Element methodology has been developed to simulate the complete staking process including shaft press in, staking, and after staking tool release. The critical process parameters, such as staking force, staking length, shaft and holes interference amount, etc., are then evaluated systematically.
2016-04-05
Technical Paper
2016-01-1144
Syeda Faria Mahmud, Shahjada A. Pahlovy, Masamitsu KUBOTA, Makoto Ogawa, Norio Takakura
In a gasoline vehicle, about 5-6% of the total fuel energy is wasted due to inefficiency of transmission and other parts of the driveline. This loss can be reduced by reducing the drag torque of transmission clutch. The drag torque is developed; since the friction disks and plates of clutch are always in rotating motion with fluid.This undesired drag loss has significant effect on reducing the efficiency of transmission and increasing the fuel consumption of a car. Therefore, it is important to understand the physics of this kind of flows and identify design variables and parameters that dictate the loss mechanism. The most conventional technique to suppress the drag torque is to cut grooves on the friction disk to facilitate smooth and faster discharge of the ATF. The shape of the grooves also plays a substantial role on the drag torque characteristics.
2016-04-05
Technical Paper
2016-01-1096
Chun Hui, Yang Wang
Several factors including internal factors which are related to the structure and components of transmission and external factors which are related to the running condition influence transmission efficiency collectively. This paper mainly discusses effects of different transmission running condition under different gears for transmission efficiency and deduces a methodology for simulation of efficiency. On the test rig, the mechanical transmission is experimented in different speeds, torques and work temperature, thus the corresponding data are obtained. With these experimental data, further analysis, such as relationship between torque and efficiency under the same gear and speed, is performed. Main power-loss factors including gears meshing power loss, gears churning power loss and so on also affect transmission efficiency. Considering these, this paper applies a methodology about power-loss factors to deduce the transmission efficiency.
2016-04-05
Technical Paper
2016-01-1147
Xiaofeng Yin, Han Lu, Xiaojuan Zhao, Xiaohua Wu, Yongtong Zhang
To improve the comprehensive performance of vehicles equipped with stepped automatic transmission (SAT), the optimization of gearshift schedule should take into account various performance such as power performance, fuel economy, etc. In addition, the SATs would become more acceptable if the optimized gearshift schedule could also be individualized to reflect the driver’s expectation on vehicle performance to a reasonable extent. For the purpose of ensuring the comprehensive performance and improving the individual-ability of vehicles equipped with SAT, a linear weighted method has been proposed to construct the a performance evaluation function, which applies different weights to represent driver’s expectation on performance by using these weights to multiply the normalized value of each sub-performance index.
2016-04-05
Technical Paper
2016-01-0089
Mohamed Samy Barakat
This Application is using Multilayer Perceptron Algorithm to predict the shifting gear timing based on throttle percentage, vehicle velocity, time history & engine RPM and other features, in order to enhance the fuel efficiency, shifting time, power loss and comfort of the driver. The model makes no assumptions about how transmission performance aspects like slipping time or the existence of distinct environments like high temperature affects the power train system performance. Instead, the model can learn to model any type of distortion or additive noise given sufficient training data. The network will be implemented on an AMESim model to characterize the operating temperatures and optimize the gearbox design to work with an optimal temperature and reach quickly this temperature. Multilayer Perceptron Algorithm possesses important properties such as many degrees of freedom, non linearity, and dissipations.
2016-04-05
Technical Paper
2016-01-1124
Luca Castellazzi, Andrea Tonoli, Nicola Amati, Alessandro Piu, Enrico Galliera
The term driveability describes the driver's complex subjective perception of the interactions between himself and the vehicle. One of them is associated to longitudinal acceleration aspects. At the moment, a relevant contribution to the driveability process optimization is realized by means of track tests in which the considerable amount of parameters (such as stiffnesses or dampers rather than the internal combustion engine control) can be tuned in order to obtain a feasible longitudinal acceleration response. The drawback of this approach is that it is carried out at a stage when a design iteration becomes very expensive in terms of time and cost. In addition, the actual trend of downsize and supercharge the engines leads to the design and the implementation of components able to attenuate the higher vibrations that can be transmitted to the driver because of larger torque irregularities.
Viewing 1 to 30 of 3449

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