Experimental study of an electro-mechanical CVT ratio controller

Tawi, Kamarul Baharin; Jamaluddin, Hishamuddin

doi:10.1007/s12239-013-0035-x

Cited by 19 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, only one of the two sheaves on each pulley is movable, however, two moveable sheaves are designed to eliminate belt misalignment. 19 Both radial and tangential movements are possible for the belt/ chain, which depends on the loaded torque and pulleys' axial forces. 6,20 Given the requirement of hydraulic system to work with engines and provide sufficient pressure to avoid belt slipping, the efficiency of CVT is generally lower than DCT and inevitability suffers a poor speed response.…”

Section: Simplified Cvtmentioning

confidence: 99%

Development of continuously variable transmission and multi-speed dual-clutch transmission for pure electric vehicle

Ruan

Walker

et al. 2018

Advances in Mechanical Engineering

View full text Add to dashboard Cite

Pure electric vehicles, as a promising alternative to conventional fossil fuel-powered passenger vehicles, provide outstanding overall energy-utilizing efficiency by omitting the internal combustion engine. However, because of lower energy density in battery energy storage, the driving range per charge is limited by this electrochemical power source, leading to a socalled range phobia and presenting a major barrier for large-scale commercialization. The widely adopted single-reduction gear in pure electric vehicles typically do not achieve the diverse range of functional needs that are present in multi-speed conventional vehicles, most notably acceleration performance and top speed requirements. Consequently, special-designed multi-speed pure electric vehicle-powertrains have been compared and investigated for these applications in this article. Through the optimizing of multiple gear ratios and creating special shifting strategies, a more diverse range of functional needs is realized without increasing the practical size of the electric motor and battery. This article investigates the performance improvements of pure electric vehicle realized through utilization of multi-speed dual-clutch transmissions and continuously variable transmissions. Results reveal that there can be significant benefits attained for pure electric vehicles through multi-speed transmissions. Simulation results shows that continuously variable transmission and two-speed transmission are the two most promising transmissions for pure electric vehicle in different classes, respectively.

show abstract

Section: Simplified Cvtmentioning

confidence: 99%

Development of continuously variable transmission and multi-speed dual-clutch transmission for pure electric vehicle

Ruan

Walker

et al. 2018

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…The inclusion of Belleville springs also simplifies the controlling strategy for the ratio change procedure [5]. Sufficient clamping force on the V-belt is crucial to ensure minimum slipping of the V-belt so that the torque can be successfully transferred between the primary shaft and the secondary shaft.…”

Section: Design Concept Of Emdap Cvtmentioning

confidence: 99%

“…For example, Nissan is using it for its Nissan March while Honda and Mitsubishi also use it in their Honda Brio and Mitsubishi Mirage respectively [2][3][4]. Nevertheless, a pulley-based CVT currently used by these carmakers applies an electro-hydro-mechanical (EHM) actuation system to change the CVT ratio and to provide sufficient clamping force on the V-belt [1,5]. The EHM actuation system works on hydraulic pressure, thus an appropriate hydraulic pump is required to supply continuous pressure during operation, especially to maintain belt tension to prevent slipping.…”

Section: Introductionmentioning

confidence: 99%

“…The EHM actuation system works on hydraulic pressure, thus an appropriate hydraulic pump is required to supply continuous pressure during operation, especially to maintain belt tension to prevent slipping. This is usually done by continuously siphoning some of the power from the vehicle's engine, which is thus an inefficient way of using energy and ultimately leads to increased fuel consumption by the car [1,5,6]. Figure 1.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of Electro-Mechanical Dual-Acting Pulley Continuously Variable Transmission

et al. 2015

Self Cite

View full text Add to dashboard Cite

Pulley-based continuously variable transmission (CVT) with a metal pushing V-belt is fast becoming the preferred choice for global carmakers due to its potential particularly in terms of fuel efficiency thanks to its continuous and wide ratio range. Nevertheless, the existing CVTs still face the issues of high power consumption from the engine because of the application of an electro-hydro-mechanical (EHM) actuation system for its ratio changing process and clamping force mechanism. To address this issue, researchers from Universiti Teknologi Malaysia have successfully developed the prototype of an electro-mechanical dual-acting pulley continuously variable transmission (EMDAP CVT) for automotive applications. The prototype of EMDAP CVT is developed for a maximum input torque of 160 Nm with the application of a metal pushing V-belt. The results from the testing prove that the prototype can vary its ratio from 2.8 to 0.6 and no continuous power is required to maintain a constant CVT ratio. These results suggest that the prototype is workable and future testing in a real car is possible.

show abstract

“…In a nutshell, Van Doorne's CVT is currently only applicable to low-torque passenger cars because of limited torque capacity. Among all the existing researches on CVT systems, very few of them focus on torque capacity enhancement for Van Doorne's CVT; most of existing literature studied the influence of friction characteristic between the belt and the pulley upon the torque capacity in both steady and transient states [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Dynamics of a Novel Dual-Belt Continuous Variable Transmission Based on a Newly Developed Test Rig

Wong

Xie

Chen

2015

Shock and Vibration

View full text Add to dashboard Cite

A novel dual-belt Van Doorne’s continuous variable transmission (DBVCVT) system, which is applicable to heavy-duty vehicles, has been previously proposed by the authors in order to improve the low torque capacity of traditional single-belt CVT. This DBVCVT is a novel design among continuously variable transmissions and is necessary to be prototyped for experimental study, and the analytical dynamic model for this DBVCVT also needs to be experimentally validated. So, this work originally fabricated a prototype of DBVCVT and integrates this prototype to a light-load hardware-in-the-loop test rig by replacing the engine and load equipment with the AC motor and magnetic powder dynamometer. Moreover, with the use of this newly developed test rig, this work implements the experimental study of this DBVCVT for the first time. The comparison of experimental and simulation results validates the previously proposed analytical model for DBVCVT, and some basic characteristics of the DBVCVT in terms of the reliability, speed ratio, and transmission efficiency are also experimentally studied. In all, this developed test rig with the analytical model lays the foundation for further study on this novel DBVCVT.

show abstract

Experimental study of an electro-mechanical CVT ratio controller

Cited by 19 publications

References 13 publications

Development of continuously variable transmission and multi-speed dual-clutch transmission for pure electric vehicle

Development of continuously variable transmission and multi-speed dual-clutch transmission for pure electric vehicle

Design of Electro-Mechanical Dual-Acting Pulley Continuously Variable Transmission

An Experimental Study on Dynamics of a Novel Dual-Belt Continuous Variable Transmission Based on a Newly Developed Test Rig

Contact Info

Product

Resources

About