Measurement and Control of Slip in a Continuously Variable Transmission

Bonsen, B.; Klaassen, T.W.G.L.; Meerakker, K.G.O. van de; Steinbuch, M Maarten; Veenhuizen, P.A.

doi:10.1016/s1474-6670(17)31078-9

Cited by 11 publications

(15 citation statements)

References 3 publications

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“…Meanwhile, the threshold value for macroslip detection using the amplitude difference rate needs to be selected according to the input torque and the speed ratio, which is also one of the drawbacks of previous slip evaluation methods. 6,8,9 Even though the macroslip detection method proposed in this study shows a detection time delay due to the signal processing, it can be reduced when applied with a high oscillation frequency such as that from engine torque vibrations, because the time delay depends on the oscillation period of the torque vibrations. …”

Section: Validation By Experimentsmentioning

confidence: 95%

“…6 Macroslip is defined when the slip rate becomes larger than a certain value. This method is very direct but not practical.…”

Section: Introductionmentioning

confidence: 99%

“…This is also one of the drawbacks of the slip evaluation methods. 6,8,9 In this study, a macroslip detection method is proposed using the instantaneous period (IP) of the primary pulley's acceleration and the IP of the secondary pulley's acceleration, which give the advantage of defining a time-varying threshold value independent of the input torque and the speed ratio. The performance of the macroslip detection method was evaluated by simulations and experiments.…”

Section: Introductionmentioning

confidence: 99%

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Macroslip detection for a metal V-belt continuously variable transmission using the period difference

Jang

Ahn

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this study, a macroslip detection method is proposed for a metal V-belt continuously variable transmission. The macroslip detection method was developed using the instantaneous periods of the primary pulley's acceleration and the secondary pulley's acceleration, which can be obtained from the existing speed sensors. To obtain the instantaneous periods of the accelerations of the pulleys in real time, a signal-processing method was developed on the basis of zerocross detection. Using the instantaneous periods, the period difference is introduced, and a threshold value b is defined to evaluate the slip state. The characteristics of the period difference and b were investigated by a three-dimensional analysis, in which a three-dimensional model of the continuously variable transmission including the blocks, the bands and the pulleys was constructed, and the velocity of each element and the slip rate were obtained. From the simulation results, it was found that the period difference stays below the threshold value b in the microslip region and begins to increase over the threshold value b in the macroslip region. The macroslip detection method proposed in this study was validated by experiments, which showed that the method is effective for detecting the occurrence of macroslip, independently of the input torque and the speed ratio.

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Section: Validation By Experimentsmentioning

confidence: 95%

“…6 Macroslip is defined when the slip rate becomes larger than a certain value. This method is very direct but not practical.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Macroslip detection for a metal V-belt continuously variable transmission using the period difference

Jang

Ahn

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…We expect the clamping force to be as minimal as possible on the condition that the torque is transmitted reliably. A method to control belt slip in a CVT is proposed to minimize the clamping forces while preventing excessive slip that can damage the system [9,10]. In this method, the clamping force is decreased to achieve proper slip and a higher frictional coefficient between the belt and the pulley.…”

Section: Introductionmentioning

confidence: 99%

Forward parameter optimization design for actuator of electromechanical continuously variable transmission

Sun

Liu

2018

J Braz. Soc. Mech. Sci. Eng.

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An electromechanical continuously variable transmission (EMCVT) with an actuator containing two direct current (DC) motors is proposed to improve the transmission efficiency of a continuously variable transmission (CVT) by reducing the power consumed by the CVT actuator. To enhance the EMCVT efficiency, the ratio and driven pulley clamping force are adjusted using an electromechanical actuator. It is required that the adjustable range of the driven pulley clamping force of the EMCVT is maximized and the operating power of the DC motors in the actuator is minimized. However, this adjustable range is limited when the actuator is designed for the maximum required driven pulley clamping force. To ameliorate this issue, the electromechanical actuator is optimized in this paper. The structure and operating principles of the EMCVT are illustrated, and the main actuator part models are built. Accordingly, the design principle of the main actuator parts is determined. The required clamping force for four standard driving cycles is considered, and the structural parameters of Belleville springs in the actuator are optimized using a genetic algorithm. Two DC motors are suitably selected, and the mechanical transmission system of the actuator is determined. The optimization results show that the adjustable range of the driven pulley clamping force is increased by over 80% for a high CVT ratio and that the energy consumed by the actuator is reduced for ECE and EUDC driving cycles by ~ 56% and ~ 28%, respectively, as compared to the energy consumed by the actuator before optimization.

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“…2 [6]. It can be seen that the slope of the curves and the maximum traction coefficients clearly depend on the ratio, but all curves show the same distinct shape.…”

Section: A Working Principlementioning

confidence: 88%

Slip controller design and implementation in a continuously variable transmission

Pulles

Bonsen

Steinbuch

et al.

Proceedings of the 2005, American Control Conference, 2005.

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Abstract-Continuously Variable Transmissions (CVT)can be used to operate a combustion engine in a more optimal working point. Unfortunately, due to the relatively low efficiency of modern production CVT's the total efficiency of the driveline is not increased significantly. This low efficiency is mainly caused by losses in the hydraulic actuation system and the variator. Decreasing the clamping forces in the variator greatly improves the efficiency of the CVT. However, lower clamping forces increase the risk of excessive belt slip, which can damage the system. In this paper a method is presented to measure and control slip in a CVT in order to minimize the clamping forces while preventing destructive belt slip. To ensure robustness of the system against torque peaks, a controller is designed with optimal load disturbance response. A synthesis method for robust PI(D)-controller design is used to maximize the integral gain while making sure that the closed loop system remains stable. Experimental results prove the validity of the approach.

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Measurement and Control of Slip in a Continuously Variable Transmission

Cited by 11 publications

References 3 publications

Macroslip detection for a metal V-belt continuously variable transmission using the period difference

Macroslip detection for a metal V-belt continuously variable transmission using the period difference

Forward parameter optimization design for actuator of electromechanical continuously variable transmission

Slip controller design and implementation in a continuously variable transmission

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