scholarly journals DESIGN OF A FEEDBACK CONTROLLER FOR TORQUE CONVERTER CLUTCH SLIP SYSTEM IN PASSENGER CAR AUTOMATIC TRANSMISSION

1999 ◽  
Vol 1999 (4) ◽  
pp. 643-648
Author(s):  
Jin-Oh HAHN ◽  
Byung-Kwan SHIN ◽  
Han-Sang JO ◽  
Kyo-Il LEE
Keyword(s):  
Slip System ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Feedback Controller ◽  
Passenger Car

Dynamic Temperature Testing and Modeling for an Automatic Transmission Clutch

2001 ◽  
Author(s):  
Thomas DeMurry ◽  
Yanying Wang
Keyword(s):  
Experimental Data ◽  
Real Time ◽  
Automatic Transmission ◽  
Thermal Characteristics ◽  
Torque Converter ◽  
Telemetry System ◽  
Temperature Model ◽  
And Control ◽  
Good Agreement ◽  
Dynamometer Test

Abstract The primary objectives of this study are (1) to validate the hardware design and control methodologies for preserving the thermo-mechanical integrity of a launch clutch emulating a torque converter and (2) to develop a simple, control oriented clutch-temperature model that may act as a virtual thermocouple in the processor of an automobile for real-time clutch-temperature predictions. In a dynamometer test cell, a Ford CD4E transaxle is instrumented with a thermocouple-based telemetry system to investigate clutch thermal characteristics during engagements, neutral idle, single and repeated launching, torsional isolation, and hill holding. A nonlinear, SIMULINK™-based model for estimating temperature is developed. The results from the simulations are in good agreement with the experimental data.

The Layout Optimization for Axial Stiffness of a Flexplate Disk with Weight and Inertial Moment Constraints

2013 ◽  
Vol 655-657 ◽  
pp. 630-635 ◽  
Author(s):  
Da Ke Zhang ◽  
Chong Wang ◽  
Yi Chao Yang ◽  
Han He
Keyword(s):  
Topology Optimization ◽  
Optimum Design ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Layout Optimization ◽  
Axial Stiffness ◽  
Manufacturing Cost ◽  
Mechanical Component ◽  
Inertial Moment

A flexplate is a mechanical component that couples the crankshaft to the torque converter of a car with automatic transmission. A higher axial stiffness is one of significant requirements for it in order to ensure its performance. In this paper an optimum design of the flexplate disk is described that maximizes the axial stiffness of the flexplate disk with weight and inertial moment constraints. The strategy for optimizing the layout of the disk is to perform topology optimization first then position optimization. The relation is presented which shows the variation of axial stiffness with respect to changes of the number, shape and position of the holes on the flexplate disk. The research shows that the shape of the hole punched on the disk does not affect the axial stiffness greatly. Thus, the manufacturing cost should be considered first in the optimum design of the flexplate disk

A Mechanical Torque Converter, and Its Use as an Automobile Transmission

1976 ◽  
Vol 190 (1) ◽  
pp. 447-456 ◽  
Author(s):  
Frederic Williams ◽  
D. Tipping
Keyword(s):  
Fuel Consumption ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Manual Transmission ◽  
Output Shaft ◽  
Basic Design ◽  
Prime Mover ◽  
Experimental Performance ◽  
Performance Curves ◽  
And Performance

SYNOPSIS A torque converter is described in which the prime mover is directly coupled to a pulsator unit which produces an alternating torque. Sprag-type clutches are used to rectify this torque and to transmit it to the converter output shaft. A developed version of this basic design for use as an automobile automatic transmission is described and theoretical and experimental performance curves are given which show that an automobile drive is possible which approaches a manual transmission for fuel consumption and performance.

Dynamic Model of Automatic Transmission System of Tracked Vehicle

2013 ◽  
Vol 397-400 ◽  
pp. 369-373 ◽  
Author(s):  
Jun Yi ◽  
Shui Sheng Chen ◽  
Da Zhang You
Keyword(s):  
Regression Analysis ◽  
Dynamic Model ◽  
Intelligent Control ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Transmission System ◽  
Simulation System ◽  
Tracked Vehicle ◽  
Planetary Transmission ◽  
Test Result

The dynamic characteristic of automatic transmission system of tracked vehicle was thorough analyzed. The primary characteristic of torque converter was proposed by means of regression analysis of test result. The dynamic model of three-freedom planetary transmission was constituted using drive principles of planetary transmission. Thus the foundation of intelligent control and simulation system of automatic transmission of tracked vehicle was established.

Control of A Friction Launch Automatic Transmission Using a Range Clutch

2006 ◽  
Author(s):  
Chunhao J. Lee ◽  
Kumar Hebbale ◽  
Shushan Bai ◽  
Farzad Samie
Keyword(s):  
Robust Control ◽  
Fuel Economy ◽  
Control Strategy ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Control Algorithms ◽  
Automatic Transmissions ◽  
Fuel Economy Improvement ◽  
Vehicle Test ◽  
Overall Ratio

Friction Launch transmissions use a wet multi-plate clutch to replace the torque converter in an automatic transmission. The main benefit of this technology is fuel economy improvement as a result of eliminating the losses in the torque converter. By using one of the range clutches inside the transmission instead of an input clutch in place of the converter, the benefits of this integrated friction launch technology, such as reduction in mass, packaging, and cost, can be enhanced. The availability of new automatic transmissions with higher number of speeds and wider overall ratio spreads makes this technology more viable than ever before. This project focuses on control issues with the friction launch clutch which include developing robust control algorithms for launch and creep, and providing damping to the driveline, when required, and ensuring acceptable vehicle drivability. This paper describes in detail the development of vehicle launch control algorithms. Vehicle test data is presented to show that the control strategy developed in this project significantly reduces the gap between the drivability of a starting clutch vehicle and a torque converter equipped vehicle.

Robust and Simplified Design of Slip Control System for Torque Converter Lock-Up Clutch

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
R. Hibino ◽  
M. Osawa ◽  
K. Kono ◽  
K. Yoshizawa
Keyword(s):  
Control System ◽  
Design Process ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Operating Conditions ◽  
Slip Control ◽  
Design Time ◽  
Actual Design ◽  
High Level ◽  
Relationship Of

A torque converter lock-up clutch slip control system, which is designed to improve fuel economy, must be able to precisely regulate slip speed. Also the system must have a high level of robustness for coping with changes in the operating conditions and any deterioration in the automatic transmission fluid and the clutch. Moreover, to reduce the design time, the design process must be as simple as possible. In this paper, we first propose a loop shaping that aims to optimize complementary sensitivity function of the control system, while satisfying the abovementioned requirements of performance and robustness. Next, a method for simplifying the design process is proposed, that is, a model and a controller are expressed by interpolation. A controller set, which has a relationship of duality to the interpolation parameters of the model, is created in advance so that the construction of a new control system can be realized by identifying the characteristic parameters only. From application to the actual design process for a vehicle, we verified that the design time was reduced to less than 1∕3 of that required for the conventional method. This new method has already been adopted for the design and fitting of new products.

Modelling of dynamic characteristics of an automatic transmission during shift changes

2002 ◽  
Vol 216 (4) ◽  
pp. 331-341 ◽  
Author(s):  
N Zhang ◽  
D K Liu ◽  
J M Jeyakumaran ◽  
L Villanueva
Keyword(s):  
Dynamic Characteristics ◽  
Hydraulic System ◽  
Model Simulation ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Transmission System ◽  
Simulation System ◽  
Transient Dynamics ◽  
Output Torque ◽  
System Module

This paper describes modelling of the transient dynamics of an automatic transmission during gear changes. A brief introduction to the automatic transmission system and the dynamic characteristics of the transmission components during the gear changes are presented. Then, detailed mathematical models of a four-speed automatic transmission manufactured by BTR Automotive, Australia, are developed. A mode description method is used to describe the transient shifting process and a modular structure of the transmission system, which consists of a torque converter module, geartrain module, hydraulic system module and modules of clutches and bands, is presented. As an application, the developed simulation system is applied to investigate the transient performance of the automatic transmission during the 1–2 shift process. The output torque profiles predicted by the model simulation correlate very well with the experimental data measured from vehicle tests.

scholarly journals ESTIMATION OF PARAMETERS OF THE TORQUE CONVERTER OF AN AUTOMATIC TRANSMISSION OF A PASSENGER VEHICLE

2020 ◽  
pp. 133-146
Author(s):  
Elias Dias Rossi Lopes ◽  
André Flora Alves Pinto ◽  
Caio César do Prado Dorea Reis ◽  
Gustavo Simão Rodrigues
Keyword(s):  
Automatic Transmission ◽  
Torque Converter ◽  
Passenger Vehicle ◽  
Estimation Of Parameters

scholarly journals Advanced Power Transmission System

2012 ◽  
Vol 23 (2) ◽  
pp. 191-207
Author(s):  
Rafea M. Abd El-Maksoud Rafea M. Abd El-Maksoud
Keyword(s):  
High Performance ◽  
Power Transmission ◽  
Automatic Transmission ◽  
Planetary Gear ◽  
Torque Converter ◽  
Transmission System ◽  
Present System ◽  
Power Splitting ◽  
Operating Modes ◽  
Power Transmission System

Different researches are adopted to modify and enhance automatic transmission by every means. Whereas, torque converter that represents the most important component in such transmission suffers from some problems that are not completely solved. In this paper, power transmission system is herein introduced as a unique power transmission system that is not affected by torque converter problems. This power transmission operates with power splitting concept and is composed of conventional torque converter connected to planetary sets. Three clutches are used to shift the operating modes and unique positive displacement hydraulic couplings are utilized to regulate performance in power paths. Also, a modified model used to predict torque converter performance is utilized with planetary gear kinetics to assess the transmission performance. Moreover, the present system operates with high performance. Unlike the automatic transmission that operates in line, the present system operates with infinity number of operational bands for each engine speed.

scholarly journals Slip at Vehicle Transmission System with Hydrokinetic Converter in the Urban Test Cycle

2019 ◽  
Vol 26 (4) ◽  
pp. 21-28
Author(s):  
Andrzej Bieniek ◽  
Jarosław Mamala ◽  
Krzysztof Prażnowski ◽  
Mariusz Graba
Keyword(s):  
Automatic Transmission ◽  
System Optimization ◽  
Torque Converter ◽  
Transmission System ◽  
Transmission Systems ◽  
Factors Affecting ◽  
Driving Cycles ◽  
Harmful Emissions ◽  
The One ◽  
Slip Phenomenon

AbstractThe study concentrated on slip phenomenon occurring at hydrokinetic converter in passenger car transmission system. Optimization of modern automatic transmission systems aims, on the one hand, to further increase the comfort of use, and on the other hand to improve the efficiency and reliability operation of individual components, in such a way as to ultimately result in lowering fuel consumption and also harmful emissions. One of the important factors affecting the mentioned transmissions properties as a whole system is the slip phenomenon occurring between the pump and the hydrokinetic converter turbine. The study presents the results of research on ZF 4HP20 and Fuji Hyper M6 gearboxes operating in vehicle transmission systems. The tests were carried out using the MAHA MSR 500 chassis dynamometer during driving at chosen test cycles. The research covered the transmission systems operating according to selected control algorithms affecting not only the gear shifting strategy but also the operation of the lock up clutch causing the transmissions slip values. As shown by the conducted research, the algorithm controlling the operation of the torque converter can have a significant influence on their operating indexes. The conducted analyses indicate the possibilities of improving the transmission operating indexes, especially in urban driving cycles.

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