319 Research on the Transmission Efficiency of the Planetary Gears Drives for Automatic Transmission

2007 ◽  
Vol 2007 (0) ◽  
pp. 268-271
Author(s):  
Yong CHEN
Keyword(s):  
Automatic Transmission ◽  
Transmission Efficiency ◽  
Planetary Gears

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.

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.

Theoretical Investigation on Automatic Transmission Efficiency

1996 ◽  
Author(s):  
Dong Hoon Park ◽  
Tae Seok Seo ◽  
Do Gi Lim ◽  
Hee Bock Cho
Keyword(s):  
Theoretical Investigation ◽  
Automatic Transmission ◽  
Transmission Efficiency

Control of Clutch on DCT during Start Process

2011 ◽  
Vol 130-134 ◽  
pp. 357-360
Author(s):  
Hui Fang Kong ◽  
Xiu Ping Li ◽  
Wei Bao
Keyword(s):  
Simple Structure ◽  
Automatic Transmission ◽  
Transmission Efficiency ◽  
Transmission System ◽  
Mechanical Transmission ◽  
Stable Operation ◽  
Dual Clutch Transmission ◽  
The Core ◽  
Clutch Control ◽  
Start Process

Dual Clutch Transmission (DCT) is a new automatic transmission system, which overcomes the shortcomings of power break when shift of the automatic mechanical transmission (AMT) and not only inherit high transmission efficiency and simple structure of AMT, but also inherit small impact of hydraulic, non-power interruption characteristics of automatic transmission (AT). The core and difficulty is the clutch control in the start process, the control targets are not only to ensure the smoothness of the start process and stable operation of the engine, but also to ensure quickness[1].

A study of shift control using the clutch pressure pattern in automatic transmission

2003 ◽  
Vol 217 (4) ◽  
pp. 289-298 ◽  
Author(s):  
Woosung Han ◽  
Seung-Jong Yi
Keyword(s):  
Dynamic Models ◽  
Equations Of Motion ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Optimum Pressure ◽  
Planetary Gears ◽  
Transient Characteristics ◽  
Engine Torque ◽  
Shift Control ◽  
Road Load

It is necessary to understand the overall system including engine, torque converter, multiplate clutch, band brake, one-way clutch, planetary gears, road load and tyre to analyse the performance of the vehicle powertrain. The performance of the powertrain can be analysed using dynamic models including transient characteristics and the equations of motion are derived from the dynamic models of the powertrain. In this study, the shift transient characteristics of the vehicle equipped with a Ravigneaux-type planetary gears automatic transmission has been investigated. A shift control using engine torque reduction and optimum pressure trajectory has also been investigated in order to enhance transient characteristics during shift.

Smart Multimode Transmission for Automobiles

2017 ◽  
Author(s):  
Nitin Srinath ◽  
Ashwin Kumar ◽  
Sharnappa Joladarashi
Keyword(s):  
Control Algorithm ◽  
Automatic Transmission ◽  
Transmission Efficiency ◽  
Manual Transmission ◽  
Driving Experience ◽  
User Input ◽  
Take The Best ◽  
Automatic Mode ◽  
Automatic Transmissions ◽  
Manual Mode

There are two basic types of transmissions — manual and automatic. While manual transmissions have greater transmission efficiency and better overall driving experience, it is difficult and not as easy to handle as automatic transmissions. Automatic transmissions make life a lot easier for the driver but are less efficient and laggard. So, the aim of this project is to take the best of both worlds and combine it in one, i.e. a transmission system that is capable of working as both a manual and an automatic transmission. For this, we plan to automate a regular manual transmission with a manual override option on both the clutch and the gearbox systems. Motors will be used to control the clutch and the changing of gears in the gearbox. In the manual mode, the motors will be operated by user input switches (clutch pedal and stick shift). In the automatic mode, the same motors will be controlled by a control algorithm based on various inputs like weight of the car, inclination, speed of the engine and the car etc.

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