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A multi-model based adaptive reconfiguration control scheme for an electro-hydraulic position servo system

Zhang Zhao, Yang Zhong, Liu Shuchang, Chen Shuang, Zhang Xiaokai

International Journal of Applied Mathematics and Computer Science

2022

Vol. 32, no. 2

185--196

Reliability and safety of an electro-hydraulic position servo system (EHPSS) can be greatly reduced for potential sensor and actuator faults. This paper proposes a novel reconfiguration control (RC) scheme that combines multi-model and adaptive control to compensate for the adverse effects. Such a design includes several fixed models, one adaptive model, and one reinitialized adaptive model. Each of the models has its own independent controller that is based on a complete parametrization of the corresponding fault. A proper switching mechanism is set up to select the most appropriate controller to control the current plant. The system output can track the reference model asymptotically using the proposed method. Simulation results validate robustness and effectiveness of the proposed scheme. The main contribution is a reconfiguration control method that can handle component faults and maintain the acceptable performance of the EHPSS.

Forecasting the number of failures of the steering system components with the use of the grey system theory method

Kądziołka Tomasz, Opoka Kazimierz

Zeszyty Naukowe. Transport / Politechnika Śląska

2021

z. 112

85--97

Steering systems are one of the most important components of a car and have a direct impact on safety and driving comfort. Therefore, high reliability is required of them. One of the methods of object reliability estimation may be the grey system theory. This method can be used not only to calculate the number of failures, but also to calculate the wear of mating parts, and the vibrations of engines and rolling elements. This work presents the use of the grey system theory for the examination of motor vehicle steering system reliability. The forecast number of failures was calculated for the various components of the steering system and the grey system accuracy was assessed. This is aimed at finding out how useful this theory is for forecasting the number of steering system failures.

Electric servosystem for turbocharger vacuum actuator replacement

Dobrucký B., Drgoňa P., Hanko B.

Autobusy : technika, eksploatacja, systemy transportowe

2017

R. 18, nr 6

1187--1190, CD

This paper deals with electric compensation servo system which serves as an upgrade for existing turbocharger vacuum pressure regulation, particularly for low-volume engines. Proposed servosystem is suitable for variable geometry turbocharger (VGT) or variable nozzle turbocharger (VNT). Servo system comprises from control unit which is attached to the signal conditioner and to the microprocessor. The microprocessor controls the servo drive through the output amplifier and servo drive is mechanically connected to the turbocharger. Advantage of this upgrade is in better response to torque requirements from driver, especially in low engine speed.

W pracy przedstawiono możliwość wymiany standardowego siłownika próżniowego dla siłownika o zmiennej dyszy / geometrii za pomocą elektrycznego serwomechanizmu za pomocą mikroprocesora. Korzystanie z tego serwosu w nowym algorytmie sterowania zmniejsza emisje z silnika, zwiększa moc silnika i eliminuje siłownik podciśnieniowy. Inną zaletą tego systemu jest wyeliminowanie źródła ujemnego ciśnienia z systemu turbodoładowania (proponowany serwoster jest zasilany standardową siecią 12V). Jedyną wadą proponowanego elektrycznego serwosysu jest konieczność kalibracji pomiędzy systemem sterowania (mikroprocesorem) a turbosprężarką.