Dynamics analysis and control of a holonomic vehicle with a continuously variable transmission

2002 ◽  
Author(s):  
K.A. Tahboub ◽  
H.H. Asada
Keyword(s):  
Continuously Variable Transmission ◽  
Dynamics Analysis ◽  
Variable Transmission ◽  
And Control

Dynamics Analysis and Control of a Holonomic Vehicle With a Continuously Variable Transmission

2000 ◽  
Vol 124 (1) ◽  
pp. 118-126 ◽  
Author(s):  
Karim A. Tahboub ◽  
Harry H. Asada
Keyword(s):  
Dynamic Characteristics ◽  
Impedance Matching ◽  
Gear Ratio ◽  
Continuously Variable Transmission ◽  
Friction Compensation ◽  
Vehicle Stability ◽  
Dynamics Analysis ◽  
Dc Motors ◽  
Variable Transmission ◽  
And Control

This paper presents kinematic and dynamic analysis of a holonomic vehicle with continuously-variable transmission. Four ball wheels, independently actuated by DC motors, enable for moving the vehicle in any direction within the plane and rotating it around its center. The angle between the two beams holding the balls can be changed to alter the gear ratio and other dynamic characteristics of the vehicle. This feature is exploited in augmenting the vehicle stability, optimizing output power, selecting an appropriate gear ratio, and in impedance matching. A simple adaptive friction-compensation-based controller is proposed to handle the complex friction properties.

A Model-Based Approach to the Estimation and Control of a Continuously Variable Transmission

2020 ◽  
Vol 28 (5) ◽  
pp. 1940-1947 ◽  
Author(s):  
William Dunham ◽  
Jinwoo Seok ◽  
Anouck Girard ◽  
Ilya Kolmanovsky ◽  
Weitian Chen ◽  
...  
Keyword(s):  
Continuously Variable Transmission ◽  
Model Based ◽  
Variable Transmission ◽  
Estimation And Control ◽  
And Control

The Shift Speed Control of CVT on Different Conditions

2013 ◽  
Vol 373-375 ◽  
pp. 104-107
Author(s):  
Jing Jing Xia
Keyword(s):  
Speed Control ◽  
Continuously Variable Transmission ◽  
Transmission System ◽  
Dynamics Analysis ◽  
Change Rate ◽  
Variable Transmission ◽  
Ratio Change ◽  
Shift Speed

It will cause the drop of the acceleration performance and driving comfort if the continuously variable transmission shift too quickly. So Aiming at the shifting problem of continuously variable transmission system, This thesis put forward the method to control shift speed of the continuously variable transmission based on driving intention. By the dynamics analysis of continuously variable transmission system, it does a research on the influence on the motor automobiles acceleration performance and driving comfort, when the ratio changes too fast. According to working practice, analyzing shift way of continuously variable transmission system. Through the above analysis and findings, the method to control shift speed based on driving intention will be designed to make acceleration and driving comfort unified. And by limiting the maximum CVT ratio change rate, the automobile acceleration performance can be further improved.

scholarly journals Effects of Electric Circulation on the Energy Efficiency of the Power Split e-CVT Hybrid Systems

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2342 ◽  
Author(s):  
Cheng-Ta Chung ◽  
Chien-Hsun Wu ◽  
Yi-Hsuan Hung
Keyword(s):  
Energy Efficiency ◽  
Hybrid Systems ◽  
High Speed ◽  
Electric Energy ◽  
Continuously Variable Transmission ◽  
Operating Characteristics ◽  
Power Split ◽  
Variable Transmission ◽  
And Control ◽  
Operating Points

This paper aims at investigating the fundamental characteristics of energy efficiency for power split electronic-continuously-variable-transmission (e-CVT) hybrid systems under the operation of electric circulation, i.e., circulating part of the engine power through the generator and motor in form of electric energy to improve system efficiency as well as perform the continuously-variable-transmission (CVT) functionality. The relations of kinematics and energy conservation for each power component are constructed and analyzed to classify how the operating points of the engine in term of torque and rotational speed may vary under different degrees of electric circulation indicated by a parameter called ratio of circulating power. Thereby, power split e-CVT hybrid systems can be classified into three types: upward circulation, downward circulation, and neutral circulation. Accordingly, two power split e-CVT hybrid systems, one of input split type and the other of output split type, are selected to be analyzed regarding their operating characteristics and simulated on their performances of energy efficiency. As a result, the former is a type of downward circulation in favor of driving at low speed and high driving load, while the latter is a type of upward circulation with an advantage of driving at high speed and low driving load. Thereby, applying this analysis to investigate the effects of electric circulation on power split e-CVT systems may help the developers implement suitable energy management and control strategy in accordance with their corresponding operating characteristics of energy efficiency.

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