A New Hybrid-Excited Electric Continuous Variable Transmission System

2014 ◽  
Vol 50 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Yulong Liu ◽  
Shuangxia Niu ◽  
Siu Lau Ho ◽  
Wei Nong Fu
Keyword(s):  
Continuous Variable ◽  
Transmission System ◽  
Continuous Variable Transmission ◽  
Variable Transmission

Modeling of a Hybrid-Hydraulic Electric Vehicle

2012 ◽  
Author(s):  
Sina Hamzehlouia ◽  
Afshin Izadian ◽  
Sohel Anwar
Keyword(s):  
Electric Vehicle ◽  
High Performance ◽  
Continuous Variable ◽  
Transmission System ◽  
Operating Conditions ◽  
Speed Ratio ◽  
Continuous Variable Transmission ◽  
Variable Transmission

This paper introduces modeling of a gearless hydraulic transmission system that provides an infinite speed ratio like continuous variable transmission (CVT). The transmission system is modeled in various operating conditions such as all-electric and gasoline configurations. The results demonstrate the high performance operation of the transmission system.

Gear Based Quasi-Continuous Variable Transmission for Wind Turbines

2015 ◽  
Author(s):  
Krista Hernandez ◽  
Dania Wilson ◽  
Kyle Ressel ◽  
Justus Nwoke ◽  
Martin Soto ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Continuous Variable ◽  
Transmission System ◽  
Constant Speed ◽  
Spur Gears ◽  
Variable Speed ◽  
Electrical Load ◽  
Continuous Variable Transmission ◽  
Variable Transmission

Over the past decade wind turbines have been proven to be a competitive contender to produce cheap electricity. Their output electrical power went from few dozens of watts to several megawatts, and this trend is continuing to increase as they become larger in size. Most of these wind turbines are typically regulated through a set of controls acting on the electricity generator workload. These controls are achieved through the use of power electronics controlling the electrical load on the generator for variable speed wind turbine. This paper explores the possibility of implementing an alternative control system in variable wind speed turbines using a special gearbox with a high number of close consecutive discrete gear ratios. The proposed gear based Quasi-Continuous Variable Transmission, called QCVT, allows a variable speed at the input shaft and delivers a quasi-constant speed at the output shaft of the gearbox. The system consists of a special drivetrain assembly of spur gears run and controlled automatically through a set of clutch power shifters. The clutches are used to shift a set of compound gears, thus modifying the drivetrain total gear ratio. The designed system can produce up to 625 gear ratios and acts as a quasi-continuously variable transmission between the wind turbine hub and the electricity generator which requires a constant entry speed delivering a frequency of 60 Hz. The gearing transmission system has been designed using the SolidWorks CAD software for modeling and simulation and the gearing design theory has been used to dimension the special drivetrain assembly of spur gears. The kinematic gearing theory has been used to establish the multitude of close consecutive discrete gearing ratios of the transmission system. A wind driven rotor model for the wind turbine power coefficient has been used to determine the power absorbed by the wind turbine from the blowing wind and the power delivered to the electricity generator. The wind turbine torque generated by the wind and the torque produced at the electricity generator have also been determined using the multitude of gear ratios of the designed drivetrain. A new control law is established to keep the wind turbine generator running at a quasi-constant speed while producing maximum power. Considering the QCVT with its numerous close and consecutive gear ratios as the main torque regulator, the wind turbine system is expected to deliver the right needed torque for a specified electrical load. A set of results featuring how the electricity generator power and torque can be controlled by shifting the ratios of drivetrain transmissions are delivered. A particular emphasis is put on maximizing the generator delivered power using controlled gear ratios while the speed of the wind is changing. A small scale prototype of the QCVT powertrain transmission has been designed and built for concept demonstration and testing purposes.

Continuous Variable Transmission With an Inertia-Regulating System

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
G. Centeno ◽  
F. Morales ◽  
F. B. Perez ◽  
F. G. Benitez
Keyword(s):  
Angular Velocity ◽  
Power Transmission ◽  
Continuous Variable ◽  
Transmission System ◽  
Computational Simulations ◽  
Efficient Manner ◽  
Additional Degree ◽  
System A ◽  
Continuous Variable Transmission ◽  
Variable Transmission

This article describes a power transmission system applicable to vehicles. It consists of an oscillating, ratcheting-type, continuously variable transmission (CVT) system governed by an inertia mechanism. The inertia-regulating mechanism adds an additional degree of freedom and gives the system a dynamic character. The transmission consists of three different subsystems. The first of these converts the rotation of the engine or motor into an oscillating angular velocity movement and regulates the amplitude of this movement. The oscillating rotation from the first subsystem is used to drive a second subsystem, which acts as a regulating device by means of an inertial mechanism. The oscillating movement at the output of the second subsystem is rectified in the third, resulting in a unidirectional angular velocity. As a result, a unidirectional torque is generated at the output of the CVT, commensurate with the operating condition of the transmission, and this is capable of overcoming a torque resistance. A prototype of this transmission was built and tested to check the experimental results against those predicted by a series of computational simulations. As a result, the experimental graphs that characterize the operation of this type of transmission system were obtained, demonstrating its ability to function in an efficient manner.

A nano continuous variable transmission system from nanotubes

2018 ◽  
Vol 29 (7) ◽  
pp. 075707
Author(s):  
Kun Cai ◽  
Jiao Shi ◽  
Yi Min Xie ◽  
Qing H Qin
Keyword(s):  
Continuous Variable ◽  
Transmission System ◽  
Continuous Variable Transmission ◽  
Variable Transmission

Integrated control strategy of tractor hydromechanical continuously variable transmission

2020 ◽  
pp. 095440702095114
Author(s):  
Guang Xia ◽  
Huayu Zong ◽  
Xiwen Tang ◽  
Linfeng Zhao ◽  
Baoqun Sun
Keyword(s):  
Control Strategy ◽  
Integrated Control ◽  
Continuous Variable ◽  
Transmission Efficiency ◽  
Variable Speed ◽  
Speed Regulation ◽  
Continuous Variable Transmission ◽  
Variable Transmission ◽  
Working Resistance ◽  
Transmission Speed

Given the transmission efficiency fluctuation and response lag problem of hydromechanical continuous variable transmission combined with the complex and variable working environment of a tractor, an integrated control strategy of engine throttle compensation–hydromechanical continuous variable transmission speed regulation is adopted for dual-flow transmission control. On the basis of the estimation of working resistance, a fuzzy algorithm is used to design the throttle compensation law. Considering the maximum driving power of a tractor as the target of variable speed control, an hydromechanical continuous variable transmission efficiency model is established, and the control law of an hydromechanical continuous variable transmission displacement ratio with the maximum driving power of the tractor under any working condition is determined. On the basis of the wavelet neural network proportional–integral–derivative algorithm, the control law of the hydromechanical continuous variable transmission speed regulation is designed, and the parameters of proportional–integral–derivative control are corrected in real time during the control process. Based on MATLAB/Simulink modelling and simulation and the real vehicle verification test, results showed that the influence of hydromechanical continuous variable transmission efficiency fluctuation on the driving power of the entire vehicle, the response lag of the pump-controlled motor system, and the effect of the leakage on the variable speed control and the fluctuation of the working resistance are solved by studying the hydromechanical continuous variable transmission variable speed transmission control strategy. This strategy improves the stability of the tractor speed and ensured the quality of the work, thereby improving the ability of the tractor to adapt to complex working environments.

Support vector regression methodology for wind turbine reaction torque prediction with power-split hydrostatic continuous variable transmission

Energy ◽  
2014 ◽  
Vol 67 ◽  
pp. 623-630 ◽  
Author(s):  
Shahaboddin Shamshirband ◽  
Dalibor Petković ◽  
Amineh Amini ◽  
Nor Badrul Anuar ◽  
Vlastimir Nikolić ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Support Vector Regression ◽  
Continuous Variable ◽  
Support Vector ◽  
Continuous Variable Transmission ◽  
Power Split ◽  
Variable Transmission ◽  
Reaction Torque
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