Sliding control of an electropneumatic actuator using an integral switching surface

“…To overcome this problem, one can replace the 'sign' function in a small vicinity of the surface by a smooth approximation, the so-called boundary layer control that implies deterioration of accuracy and robustness. Note that this solution is not enough in pneumatic field [9] indeed, a good compromise between static position error and chattering cannot be found. In order to ensure a better derivation of velocity in real time, (34) is used to recover the acceleration signal.…”

Section: Second-order Sliding Mode Controller Resultsmentioning

confidence: 95%

“…It is believed that a robust controller can be derived based on rather little information of the system. This approach has been used in several works in order to control pneumatic systems [9][10][11]. The standard sliding mode features are high accuracy and robustness with respect to various internal and external disturbances.…”

Section: Introductionmentioning

confidence: 99%

High‐order sliding mode for an electropneumatic system: A robust differentiator–controller design

Smaoui

Brun

Thomasset

2007

Intl J Robust & Nonlinear

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SUMMARYThis paper deals with the robust control problem of a pneumatic actuator subject to parameter uncertainties and load disturbances. The control strategies are based on second-and third-order sliding mode approaches. These controllers require measurements of acceleration for feedback. However, accelerometer is seldom used in practical drive systems, because of the complexity they add to the overall process as they are mounted to the load in displacement. For this, a robust differentiator via sliding mode is used to estimate the acceleration. A comparative study between the robust differentiator and a classical one is presented. Implementation results of the proposed sliding mode differentiator-controller design on an experimental set-up are given to illustrate the developments.

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“…In order to eliminate the chattering phenomena in sliding mode control, a saturated function sat(S/u) was introduced and the sliding mode controller was redesigned using integral switching surface to make the control law smooth [24]. Defining integral switching surface as…”

Section: Eliminate Chatteringmentioning

confidence: 99%

Estimation of Road Friction Coefficient in Different Road Conditions Based on Vehicle Braking Dynamics

Zhao

Lin

et al. 2017

Chin. J. Mech. Eng.

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The accurate estimation of road friction coefficient in the active safety control system has become increasingly prominent. Most previous studies on road friction estimation have only used vehicle longitudinal or lateral dynamics and often ignored the load transfer, which tends to cause inaccurate of the actual road friction coefficient. A novel method considering load transfer of front and rear axles is proposed to estimate road friction coefficient based on braking dynamic model of two-wheeled vehicle. Sliding mode control technique is used to build the ideal braking torque controller, which control target is to control the actual wheel slip ratio of front and rear wheels tracking the ideal wheel slip ratio. In order to eliminate the chattering problem of the sliding mode controller, integral switching surface is used to design the sliding mode surface. A second order linear extended state observer is designed to observe road friction coefficient based on wheel speed and braking torque of front and rear wheels. The proposed road friction coefficient estimation schemes are evaluated by simulation in ADAMS/Car. The results show that the estimated values can well agree with the actual values in different road conditions. The observer can estimate road friction coefficient exactly in real-time and resist external disturbance. The proposed research provides a novel method to estimate road friction coefficient with strong robustness and more accurate.

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Sliding control of an electropneumatic actuator using an integral switching surface

Abstract: Mass flow rates in the half bridges " " of the servovalve, with or. Interchamber leakage mass flow rate. Variable restriction between and .

Cited by 81 publications

References 6 publications

Adaptive sliding mode control of electro-hydraulic system with nonlinear unknown parameters

Adaptive sliding mode control of electro-hydraulic system with nonlinear unknown parameters

High‐order sliding mode for an electropneumatic system: A robust differentiator–controller design

Estimation of Road Friction Coefficient in Different Road Conditions Based on Vehicle Braking Dynamics

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