A review on belt and chain continuously variable transmissions (CVT): Dynamics and control

Srivastava, Nilabh; Haque, Imtiaz

doi:10.1016/j.mechmachtheory.2008.06.007

Cited by 205 publications

(154 citation statements)

References 58 publications

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“…The author in the foregoing theoretical research, put forward the mathematical expressions between the vehicle acceleration and CVT speed ratio's variance ratio. It not only showed the relationship between speed and acceleration, but also guided the strategy analysis of CVT speed ratio control, and revealed the relationship between ratio change rate and vehicle acceleration [4] . Using these characteristics of CVT speed ratio, we can control vehicle acceleration in a short time, so that even when the output power of the engine is not reduced, the vehicle can achieve short time deceleration or acceleration.…”

mentioning

confidence: 89%

The CVT's Speed Ratio Control Research When the Vehicle Bending at High Speed

Yang¹

2018

Proceedings of the 2017 2nd International Conference on Electrical, Control and Automation Engineering (ECAE 2017)

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Abstract-When the speed ratio of the vehicle equipped with CVT changes rapidly, the acceleration of the vehicle will change synchronously, that means to exert an extra force on the driving tires. Using this feature, the desired results can be obtained in certain specific conditions, such as vehicle cornering at high speed. The models of multi DOF vehicle and CVT transmission were established to study the rapid changes in the turning process of the vehicle through the CVT ratio control. This paper introduces a method based on safety factor of CVT speed ratio control strategy. The simulation results show that if the driver fails to effectively reduce vehicle speed during high-speed cornering. As the speed ratio of CVT increasing rapidly, and the backward force can be acquired on the driving wheel, so that the vehicle can keep straight in a short time while reducing vehicle speed. The results of this paper can achieve better control results if the engine fuel injection control is combined.

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mentioning

confidence: 89%

The CVT's Speed Ratio Control Research When the Vehicle Bending at High Speed

Yang¹

2018

Proceedings of the 2017 2nd International Conference on Electrical, Control and Automation Engineering (ECAE 2017)

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“…Although extensive works have been performed on the steady-state performance and the mechanical behaviours of the variator, such as slip predictions, traction capacities, the efficiency [15] to [17], only a few studies focus on the shifting dynamics of the CVT [18] and [19] and the speed ratio control in real time. Furthermore, most researchers use semi-empirical formulations in their model that can cause some errors in different applications.…”

Section: Control-oriented Modelling With Experimental Verification Anmentioning

confidence: 99%

Control-Oriented Modelling with Experimental Verification and Design of the Appropriate Gains of a PI Speed Ratio Controller of Chain CVTs

Yıldız

Kopmaz

2017

SV-JME

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“…Another type of transmission which has been widely studied in conventional vehicles is continuously variable transmission (CVT) [10]. CVTs are capable of providing a continuous ratio change.…”

Section: Introductionmentioning

confidence: 99%

Optimization of multiple transmission layouts for minimal energy consumption of a battery electric vehicle

2018

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Abstract.Battery electric vehicles (BEVs) are a promising solution for reducing the impacts of passenger vehicles on the environment. However, their driving range is restricted due to the limitations of battery technologies. This range can be extended by adoption of multiple-speed transmissions. Most of the comparisons in the related studies are based on non-optimal designs or limited to modal driving cycles. Furthermore, the impact of power-split continuously variable transmission (PS-CVT) layout with type III power flow on the power consumption of BEVs has never been examined. In this paper, single, two and three-speed transmissions along with PS-CVTs with type I and III power flows are optimized for a case study BEV. Furthermore, the effect of push belt and fulltoroidal CVTs in construction of PS-CVT are compared. The results demonstrate that a PS-CVT with type I power flow equipped with the full-toroidal CVT has the best performance. However, it reduces the energy consumption by 0.36% compared to the optimal two-speed layout. In addition, its ratio range is more limited which can negatively impact the dynamic performance. Finally, simulation of the optimal designs along a different cycle proves that the obtained results are consistent, regardless of the driving cycle.

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A review on belt and chain continuously variable transmissions (CVT): Dynamics and control

Cited by 205 publications

References 58 publications

The CVT's Speed Ratio Control Research When the Vehicle Bending at High Speed

The CVT's Speed Ratio Control Research When the Vehicle Bending at High Speed

Control-Oriented Modelling with Experimental Verification and Design of the Appropriate Gains of a PI Speed Ratio Controller of Chain CVTs

Optimization of multiple transmission layouts for minimal energy consumption of a battery electric vehicle

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