Dynamic Analysis and Control System Design of Automatic Transmissions

Dynamic Analysis and Control System Design of Automatic Transmissions
Author: Joel M Maguire
Publisher: SAE International
Total Pages: 218
Release: 2013-02-12
Genre: Transportation
ISBN: 0768076048

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While the basic working principle and the mechanical construction of automatic transmissions has not changed significantly, increased requirements for performance, fuel economy, and drivability, as well as the increasing number of gears has made it more challenging to design the systems that control modern automatic transmissions. New types of transmissions—continuously variable transmissions (CVT), dual clutch transmissions (DCT), and hybrid powertrains—have presented added challenges. Gear shifting in today’s automatic transmissions is a dynamic process that involves synchronized torque transfer from one clutch to another, smooth engine speed change, engine torque management, and minimization of output torque disturbance. Dynamic analysis helps to understand gear shifting mechanics and supports creation of the best design for gear shift control systems in passenger cars, trucks, buses, and commercial vehicles. Based on the authors’ graduate-level teaching material, this well-illustrated book relays how the fundamental principles of hydraulics and control systems are applied to today’s automatic transmissions. It opens with coverage of basic automatic transmission mechanics and then details dynamics and controls associated with modern automatic transmissions. Topics covered include: gear shifting mechanics and controls, dynamic models of planetary automatic transmissions, design of hydraulic control systems, learning algorithms for achieving consistent shift quality, torque converter clutch controls, centrifugal pendulum vibration absorbers, friction launch controls, shift scheduling and integrated powertrain controls, continuously variable transmission ratio controls, dual-clutch transmission controls, and more. The book includes many equations and clearly explained examples. Sample Simulink models of various transmission mechanical, hydraulic and control subsystems are also provided. Chapter Two, which covers planetary gear automatic transmissions, includes homework questions, making it ideal for classroom use. In addition to students, new engineers will find the book helpful because it provides the basics of transmission dynamics and control. More experienced engineers will appreciate the theoretical discussions that will help elevate the reader’s knowledge. Although many automatic transmission-related books have been published, most focus on mechanical construction, operation principles, and control hardware. None tie the dynamic analysis, control system design, and analytic investigation of the mechanical, hydraulic, and electronic controls as does this book.

Electronic Transmission Controls

Electronic Transmission Controls
Author: Ronald K Jurgen
Publisher: SAE International
Total Pages: 588
Release: 2000-06-10
Genre: Technology & Engineering
ISBN: 0768006317

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The evolution of the automotive transmission has changed rapidly in the last decade, partly due to the advantages of highly sophisticated electronic controls. This evolution has resulted in modern automatic transmissions that offer more control, stability, and convenience to the driver. Electronic Transmission Controls contains 68 technical papers from SAE and other international organizations written since 1995 on this rapidly growing area of automotive electronics. This book breaks down the topic into two sections. The section on Stepped Transmissions covers recent developments in regular and 4-wheel drive transmissions from major auto manufacturers including DaimlerChrysler, General Motors, Toyota, Honda, and Ford. Technology covered in this section includes: smooth shift control; automatic transmission efficiency; mechatronic systems; fuel saving technologies; shift control using information from vehicle navigation systems; and fuzzy logic control. The section on Continuously Variable Transmissions presents papers that demonstrate that CVTs offer better efficiency than conventional transmissions. Technologies covered in this section include: powertrain control; fuel consumption improvement; development of a 2-way clutch system; internal combustion engines with CVTs in passenger cars; control and shift strategies; and CVT application to hybrid powertrains. The book concludes with a chapter on the future of electronic transmissions in automobiles.

Automatic Transmissions - Manual Control Sequence

Automatic Transmissions - Manual Control Sequence
Author: Automatic Transmission and Transaxle Committee
Publisher:
Total Pages: 0
Release: 2017
Genre:
ISBN:

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The scope and purpose of this SAE Recommended Practice is to provide a standard pattern or sequence for the manual control of automatic transmissions in passenger cars and light-duty trucks. This generally refers to left hand drive mechanical shift applications. This document is published as Stabilize The J915 content is not fully compliant with current industry developments and as such, may require a different standard.The content within the J915 standard relies on Federal Motor Vehicle Safety Standards (FMVSS) 102 and 114. Portions of the J915 standard that are unique may not represent current common practices within the user community. When this standard was initially published, it reflected a common philosophy towards automatic transmission manual controls sequence. Since that time, changing technologies like self-driving cars, satellite controlled driven cars and electric cars may have led members of the user community to have potentially divergent methods for manual controls sequences of automatic transmissions beyond the minimum requirements specified within the applicable Federal Motor Vehicle Safety Standards. As a result, a different standard may be required.

Gear Change Selection and Clutch Control of an Automated Manual Transmission Vehicle

Gear Change Selection and Clutch Control of an Automated Manual Transmission Vehicle
Author: Enric Canal García
Publisher:
Total Pages:
Release: 2011
Genre:
ISBN:

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The aim of this report is to provide a detailed overview of Automated Manual Transmissions (AMT) from its control point of view. An introduction about AMT is given, stating its main advantages in terms of cost and efficiency compared to other transmission types and justifying the context which makes AMT an interesting system for investigation. It is stated as well its importance for the Ford Focus prototype vehicle, where the project will carry the investigation. This leads to the aim and objectives. Then, previous research about AMT is summarized. Starting with the common problems of AMT, some proposed control strategies follow, which aim to solve the discussed problems. As well, AMTs actuator control strategies are presented. All this analysis led to some recommendations which guide the next steps of the project. Continuing with, the vehicle is introduced with major emphasis on the AMT system. It is explained the present components and new drivers that are designed and built, which provide the functionality needed for the AMT. Next, the controller architecture development process is discussed. Starting from the low-level controllers for each of the AMT actuators, it is explained the strategy used to achieve the control of them. It includes an interesting discussion on how to use the sensors present on the actuators to achieve position control without position feedback. Then, it follows the details on how each actuator is integrated in high-level controllers until achieving the complete control of the AMT successfully. Finally, some conclusions are drawn stating the importance of the feedback sensors for gearbox controllers and the clutch control concerns. Guidance is as well given for further investigation on the AMT system of the prototype vehicle. Keywords: Gearshift, Gearbox Actuators, Gearbox Control, Clutch Control, Shift Shock, Shift Time, Vehicle Start, Simulink, Stateflow, Synchromesh, dSpace.

Dynamic Analysis and Control System Design of Automatic Transmissions

Dynamic Analysis and Control System Design of Automatic Transmissions
Author: Joel M Maguire
Publisher: SAE International
Total Pages: 218
Release: 2013-02-12
Genre: Technology & Engineering
ISBN: 0768079322

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While the basic working principle and the mechanical construction of automatic transmissions has not changed significantly, increased requirements for performance, fuel economy, and drivability, as well as the increasing number of gears has made it more challenging to design the systems that control modern automatic transmissions. New types of transmissions—continuously variable transmissions (CVT), dual clutch transmissions (DCT), and hybrid powertrains—have presented added challenges. Gear shifting in today’s automatic transmissions is a dynamic process that involves synchronized torque transfer from one clutch to another, smooth engine speed change, engine torque management, and minimization of output torque disturbance. Dynamic analysis helps to understand gear shifting mechanics and supports creation of the best design for gear shift control systems in passenger cars, trucks, buses, and commercial vehicles. Based on the authors’ graduate-level teaching material, this well-illustrated book relays how the fundamental principles of hydraulics and control systems are applied to today’s automatic transmissions. It opens with coverage of basic automatic transmission mechanics and then details dynamics and controls associated with modern automatic transmissions. Topics covered include: gear shifting mechanics and controls, dynamic models of planetary automatic transmissions, design of hydraulic control systems, learning algorithms for achieving consistent shift quality, torque converter clutch controls, centrifugal pendulum vibration absorbers, friction launch controls, shift scheduling and integrated powertrain controls, continuously variable transmission ratio controls, dual-clutch transmission controls, and more. The book includes many equations and clearly explained examples. Sample Simulink models of various transmission mechanical, hydraulic and control subsystems are also provided. Chapter Two, which covers planetary gear automatic transmissions, includes homework questions, making it ideal for classroom use. In addition to students, new engineers will find the book helpful because it provides the basics of transmission dynamics and control. More experienced engineers will appreciate the theoretical discussions that will help elevate the reader’s knowledge. Although many automatic transmission-related books have been published, most focus on mechanical construction, operation principles, and control hardware. None tie the dynamic analysis, control system design, and analytic investigation of the mechanical, hydraulic, and electronic controls as does this book.

Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles

Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles
Author: National Research Council
Publisher: National Academies Press
Total Pages: 812
Release: 2015-09-28
Genre: Science
ISBN: 0309373913

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The light-duty vehicle fleet is expected to undergo substantial technological changes over the next several decades. New powertrain designs, alternative fuels, advanced materials and significant changes to the vehicle body are being driven by increasingly stringent fuel economy and greenhouse gas emission standards. By the end of the next decade, cars and light-duty trucks will be more fuel efficient, weigh less, emit less air pollutants, have more safety features, and will be more expensive to purchase relative to current vehicles. Though the gasoline-powered spark ignition engine will continue to be the dominant powertrain configuration even through 2030, such vehicles will be equipped with advanced technologies, materials, electronics and controls, and aerodynamics. And by 2030, the deployment of alternative methods to propel and fuel vehicles and alternative modes of transportation, including autonomous vehicles, will be well underway. What are these new technologies - how will they work, and will some technologies be more effective than others? Written to inform The United States Department of Transportation's National Highway Traffic Safety Administration (NHTSA) and Environmental Protection Agency (EPA) Corporate Average Fuel Economy (CAFE) and greenhouse gas (GHG) emission standards, this new report from the National Research Council is a technical evaluation of costs, benefits, and implementation issues of fuel reduction technologies for next-generation light-duty vehicles. Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles estimates the cost, potential efficiency improvements, and barriers to commercial deployment of technologies that might be employed from 2020 to 2030. This report describes these promising technologies and makes recommendations for their inclusion on the list of technologies applicable for the 2017-2025 CAFE standards.

Automatic Control in Frequency Shift Transmission

Automatic Control in Frequency Shift Transmission
Author: David Lloyd Smith
Publisher:
Total Pages:
Release: 1950
Genre:
ISBN:

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"The 0́−Frequency Shift0́+ principle has come into wide use in the past decade as a means of transmitting automatic signals over a radio link. It has been demonstrated (l) that a signal-to-noise improvement of 11 db may be obtained over an 0́−on-off0́+ system. The spurious sideband transmission is reduced, (2) and the problem of keying is greatly simplified as the carrier is, essentially, frequency modulated rather than being switched on and off. This method of transmission is at present being used extensively by military and civil communication services working between fixed points. The keying units employed are not, however, readily adapted to mobile use where flexibility and compactness are required in addition to the stability and reliability which is provided. The keyer unit in most common use (2) contains a local oscillator as part of the frequency determining circuit. This requires oven control of critical components and consequently great bulk. The mixer principle which is employed calls for crystals whose frequency differs from the transmitted frequency by 200 Kc/s, which complicates the crystal procurement problem. Various systems have been devised to give crystal control to normal F.M. transmitters. These include the Armstrong system, discriminator control systems and frequency comparison systems. These methods have not been adapted to frequency shift transmission for various reasons as will be outlined in the following pages.[...]" --

Automotive Automatic Transmission and Transaxles

Automotive Automatic Transmission and Transaxles
Author: Keith Santini
Publisher: Jones & Bartlett Learning
Total Pages: 847
Release: 2017-05-18
Genre: Juvenile Nonfiction
ISBN: 1284122034

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Automotive Automatic Transmission and Transaxles, published as part of the CDX Master Automotive Technician Series, provides students with an in-depth introduction to diagnosing, repairing, and rebuilding transmissions of all types. Utilizing a "strategy-based diagnostics" approach, this book helps students master technical trouble-shooting in order to address the problem correctly on the first attempt. -Outcome focused with clear objectives, assessments, and seamless coordination with task sheets -Introduces transmission design and operation, electronic controls, torque converters, gears and shafts, reaction and friction units, and manufacturer types -Equips students with tried-and-true techniques for use with complex shop problems -Combines the latest technology for computer-controlled transmissions with traditional skills for hydraulic transmissions -Filled with pictures and illustrations that aid comprehension, as well as real-world examples that put theory into practice -Offers instructors an intuitive, methodical course structure and helpful support tools With complete coverage of this specialized topic, this book prepares students for MAST certification and the full range of transmission problems they will encounter afterward as a technician. About CDX Master Automotive Technician Series Organized around the principles of outcome-based education, CDX offers a uniquely flexible and in-depth program which aligns learning and assessments into one cohesive and adaptable learning system. Used in conjunction with CDX MAST Online, CDX prepares students for professional success with media-rich integrated solutions. The CDX Automotive MAST Series will cover all eight areas of ASE certification.