Sliding Mode Observation with Iterative Parameter Adaption for Fast-Switching Solenoid Valves

2016 ◽  
pp. 189-212 ◽  
Author(s):  
Tristan Braun ◽  
Johannes Reuter
Keyword(s):  
Sliding Mode ◽  
Fast Switching

A Simple and Robust Sliding Mode Velocity Observer for Moving Coil Actuators in Digital Hydraulic Valves

2016 ◽  
Author(s):  
Christian Noergaard ◽  
Lasse Schmidt ◽  
Michael M. Bech
Keyword(s):  
Binary Operation ◽  
Sliding Mode ◽  
Coil Current ◽  
Estimation Errors ◽  
First Order ◽  
Fast Switching ◽  
Velocity Estimate ◽  
Parameter Values ◽  
Hydraulic Valves ◽  
Position Estimate

This paper focuses on estimating the velocity and position of fast switching digital hydraulic valves actuated by electromagnetic moving coil actuators, based on measurements of the coil current and voltage. The velocity is estimated by a simple first-order sliding mode observer architecture and the position is estimated by integrating the estimated velocity. The binary operation of digi-valves enables limiting and resetting the position estimate since the moving member is switched between the mechanical end-stops of the valve. This enables accurate tracking since drifting effects due to measurement noise and integration of errors in the velocity estimate may be circumvented. The proposed observer architecture is presented along with stability proofs and initial experimental results. To reveal the optimal observer performance, an optimization of the observer parameters is carried out. Subsequently, the found observer parameters are perturbed to assess the robustness of the observer to parameter estimation errors. The proposed observer demonstrates accurate tracking of the valve movement when using experimentally obtained data from a moving coil actuated digi-valve prototype and observer parameters estimates in the vicinity of the optimized parameter values.

New Sliding Mode Controller Based on Second Order Reachability Law

2014 ◽  
Vol 704 ◽  
pp. 357-361
Author(s):  
Mohamed Ghazy Shehata
Keyword(s):  
Sliding Mode ◽  
Second Order ◽  
Order System ◽  
Switching Function ◽  
Sliding Mode Controller ◽  
Fast Switching ◽  
Reachability Condition ◽  
System States ◽  
The Stability ◽  
Nonlinear Plants

Sliding mode control systems provide robust and simple means for controlling linear and nonlinear plants whose parameters may vary within known boundaries. The existence of an ideal sliding mode requires fast switching, which induces chattering in the system, may excite high frequency plant dynamics and consequently affect the stability of the system. This paper proposes a new simple sliding mode controller based on second order reachability law. The reachability condition in this paper is based not only on the first derivative of the switching function but also on its second derivative. The proposed controller alleviates chattering, guarantees zero steady state error, and offers smooth transients for the system states. To demonstrate the validity of the proposed controller, a second order system is used as a workbench example. The simulation results of the workbench example using MATLAB illustrate the feasibility and efficacy of the proposed controller.

Sensor fault identification in technical systems based on sliding mode observers

2019 ◽  
pp. 21-28
Author(s):  
Alexey N. Zhirabok ◽  
Alexander V. Zuev ◽  
Alexey Ye. Shumsky
Keyword(s):  
Sliding Mode ◽  
Fault Identification ◽  
Sensor Fault ◽  
Technical Systems ◽  
Sliding Mode Observers

On the Control of the Master Cylinder Hydraulic Pressure for Electro-Hydraulic Brake (EHB) Systems with the Sliding Mode Design Methodology

2018 ◽  
Vol 14 (4) ◽  
pp. 281-291 ◽  
Author(s):  
Qiping Chen ◽  
Yu Liu ◽  
Liping Zeng ◽  
Qiang Xiao ◽  
Conghui Zhou ◽  
...  
Keyword(s):  
Design Methodology ◽  
Sliding Mode ◽  
Hydraulic Pressure ◽  
Master Cylinder ◽  
Hydraulic Brake ◽  
Mode Design

Combined Sliding Mode Control with a Feedback Linearization for Speed Control of Induction Motor

2011 ◽  
Vol 7 (1) ◽  
pp. 19-24
Author(s):  
Aamir Hashim Obeid Ahmed ◽  
Martino O. Ajangnay ◽  
Shamboul A. Mohamed ◽  
Matthew W. Dunnigan
Keyword(s):  
Sliding Mode Control ◽  
Induction Motor ◽  
Feedback Linearization ◽  
Sliding Mode ◽  
Speed Control ◽  
Mode Control
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