Electronic Transmission Controls

2000 ◽  
Keyword(s):  
Internal Combustion Engines ◽  
Automatic Transmission ◽  
Transmission Efficiency ◽  
General Motors ◽  
Navigation Systems ◽  
Automotive Electronics ◽  
Passenger Cars ◽  
Mechatronic Systems ◽  
Shift Control ◽  
Continuously Variable Transmissions

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.

scholarly journals AUTOMATIC TRANSMISSIONS. COMPLEX OF ALGORITHMS OF “CLUTCH-TO-CLUTCH SHIFTS” TECHNOLOGY: ANALYSIS OF ARCHITECTURE, GENERALIZED STRUCTURE, DEVELOPMENT. PART 2

2021 ◽  
Vol 3 (56) ◽  
pp. 13-24
Author(s):  
Leonid G. KRASNEVSKIY ◽  
Keyword(s):  
Automatic Transmission ◽  
Russian Language ◽  
General Motors ◽  
Control Algorithms ◽  
Automatic Transmissions ◽  
Continuously Variable Transmissions ◽  
First Time ◽  
The Russian Language ◽  
Functional Purpose

The article continues the series of the author publications, which considers the main provisions of the “Clutch-to-Clutch Shifts” (CTC) technology — technology for automatic controlling the switching of automatic transmission (AT) stages, used in the global mass production of vehicles, hybrid and battery electric vehicles. It provides high-quality shifts, brought to the level of continuously variable transmissions. Development of power units in recent years has led to a rapid increase in the number of AT stages, which is accompanied by a complication of kinematic schemes, designs, control algorithms and, in general, an increase in the role of mechatronic control systems (MCS) in ensuring their high technical level. Effectiveness of the CTC technology depends on the perfection of the algorithms used. But their composition is not specified, which, with a large amount of information, makes it difficult for potential users to navigate in this set. In this paper, we propose (for the first time in the Russian language) the generalized structure of a set of standard algorithms necessary for the implementation of this technology in the AT MCS, which is developed on the basis of their selection from a pre-formed database of patents and publications on the theory and technology of AT control, following classification and grouping by functional purpose. For each item of the structure, there are links to patents with matching names. Detailed descriptions of several typical CTC algorithms in the AT MCS of General Motors patents are given.

scholarly journals AUTOMATIC TRANSMISSIONS. COMPLEX OF ALGORITHMS OF “CLUTCH-TO-CLUTCH SHIFTS” TECHNOLOGY: ANALYSIS OF ARCHITECTURE, GENERALIZED STRUCTURE, DEVELOPMENT. PART 1

2021 ◽  
Vol 2 (55) ◽  
pp. 25-34
Author(s):  
L.G. Krasnevskiy ◽  
Keyword(s):  
Automatic Transmission ◽  
Russian Language ◽  
General Motors ◽  
Control Algorithms ◽  
Automatic Transmissions ◽  
Continuously Variable Transmissions ◽  
First Time ◽  
The Russian Language ◽  
Functional Purpose

The article continues the series of the author publications, which considers the main provisions of the “Clutch-to-Clutch Shifts” (CTC) technology — technology for automatic controlling the switching of automatic transmission (AT) stages, used in the global mass production of vehicles, hybrid and battery electric vehicles. It provides high-quality shifts, brought to the level of continuously variable transmissions. Development of power units in recent years has led to a rapid increase in the number of AT stages, which is accompanied by a complication of kinematic schemes, designs, control algorithms and, in general, an increase in the role of mechatronic control systems (MCS) in ensuring their high technical level. Effectiveness of the CTC technology depends on the perfection of the algorithms used. But their composition is not specified, which, with a large amount of information, makes it difficult for potential users to navigate in this set. In this paper, we propose (for the first time in the Russian language) the generalized structure of a set of standard algorithms necessary for the implementation of this technology in the AT MCS, which is developed on the basis of their selection from a pre-formed database of patents and publications on the theory and technology of AT control, following classification and grouping by functional purpose. For each item of the structure, there are links to patents with matching names. Detailed descriptions of several typical CTC algorithms in the AT MCS of General Motors patents are given.

The Traveling Chain Transmission: A Novel Two-Speed Chain Drive

2003 ◽  
Author(s):  
Norman R. Bucknor ◽  
Hamid Vahabzadeh
Keyword(s):  
Fuel Economy ◽  
Automatic Transmission ◽  
Transmission Efficiency ◽  
General Motors ◽  
Speed Ratio ◽  
Chain Drive ◽  
Ratio Change ◽  
Chain Transmission ◽  
Dual Speed ◽  
Design And Testing

In an automatic transmission with planetary gearsets, several clutches are generally required to manage the speed-ratio transitions. Parasitic losses due to open clutches and the transmission pump reduce net transmission efficiency and negatively impact overall vehicle fuel economy. A novel dual-speed drive that does not require clutches to achieve a speed-ratio change has been devised as an alternative to the planetary gearset. In this paper we describe the basic drive concept and the design and testing of two prototypes that was undertaken at the General Motors R&D Center.

scholarly journals Dynamic Analysis and Control of an Automatic Transmission for Start-Stop Function and Efficiency Improvement

2015 ◽  
Vol 2015 ◽  
pp. 1-13
Author(s):  
Yang Liu ◽  
Shuhan Wang ◽  
Peng Dong ◽  
Xiangyang Xu
Keyword(s):  
Control Strategies ◽  
Automatic Transmission ◽  
Simulation Method ◽  
Transmission Efficiency ◽  
The Novel ◽  
Test Results ◽  
Test Environment ◽  
Pump System ◽  
Oil Pump ◽  
And Control

An electric oil pump (EOP) was integrated into the hydraulic system and an automatic transmission (AT) mechanical oil pump (MOP) was downsized. These processes were performed to combine a start-stop function with the AT and further improve the transmission efficiency. Furthermore, this study established a dynamics model of power loss and leakage of an 8-speed AT; a flow-based control algorithm of the EOP was then developed to realize the start-stop function and support the MOP to meet the flow requirement of the system. Based on a driving simulation method, sizes of the MOP and EOP that ensured optimal fuel economy were selected. A control strategy for the starting clutch was also developed to minimize the starting delay of the test vehicle. A test environment on a rig and prototype vehicle was established to verify the feasibility of the proposed control strategies. The test results indicated that the transmission functioned favorably with the novel two-pump system presented, and a quick and smooth starting performance was achieved when the engine was restarted. The findings in this study are extremely valuable for forward designs of an AT for realizing start-stop function and improving efficiency.

scholarly journals Smooth Gear Shift Control System of Automatic Transmission Using Estimated Output Shaft Torque.

1995 ◽  
Vol 61 (591) ◽  
pp. 4334-4338
Author(s):  
Toshimichi Minowa ◽  
Hiroshi Kimura ◽  
Junichi Ishii ◽  
Masahiko Ibamoto
Keyword(s):  
Control System ◽  
Automatic Transmission ◽  
Output Shaft ◽  
Gear Shift ◽  
Shift Control ◽  
Shaft Torque

Comparative results of evaluating the smoothness of automatic transmission gear shifting during car operation

2020 ◽  
Keyword(s):  
Longitudinal Vibration ◽  
Automatic Transmission ◽  
Quality Criteria ◽  
Technical Condition ◽  
Vibration Velocity ◽  
Vibration Acceleration ◽  
Passenger Cars ◽  
Shift Quality ◽  
Vibroacoustic Diagnostics ◽  
Comparative Results

The authors have studied the process of gear shifting, smoothness of it and peculiarities of automatic gearbox functioning of during car operation. The article describes the urgency of the problem of jerks and vibrations when changing gears. When assessing the smoothness of gear shifting, the method of technical state vibroacoustic diagnostics is applied. The method is based on the recorded parameters of vibration velocity, vibration acceleration, vibration movement with their further conversion (fast Fourier transform) into a spectralsignal. The procedure of longitudinal vibration acceleration measurements on cars in operation is described. A comparative analysis of the smoothness of gear shifting in an automatic transmission was carried out using the example of modern passenger cars. Keywords car; car operation; automatic gearbox; technical condition; gearbox malfunction; smoothness; jerks; jolts; gear shift quality criteria; vibration acceleration

Automatic Transmission Shift Control for Canceling Inertia Torque

2018 ◽  
Author(s):  
Yijing Zhang ◽  
Hiral Haria ◽  
Rohit Hippalgaonkar ◽  
Gregory Pietron ◽  
Yuji Fujii
Keyword(s):  
Automatic Transmission ◽  
Shift Control

A Methodology for Remote Debug, Test and Maintenance Based on IEEE 1588

2011 ◽  
Author(s):  
Peter Ro¨ssler ◽  
Roland Ho¨ller ◽  
Martin Zauner
Keyword(s):  
High Precision ◽  
Clock Synchronization ◽  
Automotive Electronics ◽  
Mechatronic Systems ◽  
Ieee 1588 ◽  
Remote Testing ◽  
Synchronization Protocol ◽  
Precision Clock

This work describes a new methodology for the purpose of remote testing, debugging and maintenance of networked electronic and mechatronic systems which makes use of the IEEE 1588 high-precision clock synchronization protocol. After the underlying concepts of IEEE 1588 are briefly sketched, the paper describes how functionalities like testing, debugging and maintenance can benefit from a network-wide notion of time as provided by the IEEE 1588 standard. An implementation of the IEEE 1588 protocol with support for test, debug and maintenance as well as links to the integration of the proposed concept into existing tools are presented. Further, the proposed approach is discussed under consideration of recent standardization efforts. Finally, a case study from the area of automotive electronics is described.

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