Semi-active suspension control algorithms of a car moving on rough road pavement

Vytenis Surblys

Doctoral dissertation

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The dissertation investigates the electronically adjustable car suspension. In cars, the most widely used passive suspensions have the manufacturer‘s fixed damping characteristics. However, the fast development of electronic control systems technology, the cars are increasingly fitted damping elements with the ability to change the damping characteristics. The main drawback of such systems is when the car comes on a high road bump. Since shock absorbers, like other electronic systems, have a time delay in operation, the desired damping values are changed too late.

The thesis includes introduction, three chapters, general conclusions, the list of references, the list of publications of the author on the subject of the thesis and five annexes.

In the introduction chapter reviews the research problem and the relevance of the thesis. The object of research and the aim of the thesis are described; the tasks of the thesis are formulated; the research methods, the scientific novelty of the thesis, the practical significance of the achieved results and the defended statments are described. The introduction is finished with author’s publications concerning investigated topic, presentations at conferences and seminars and the structure of the thesis are provided.

Sources of scientific literature on the subject of the thesis are reviewed in the first chapter. An analysis of suspension used in passenger cars, as well as an overview of the principles of suspension control are presented. Methods for road surface irregularities identification are reviewed; vibrations that affect driver, passengers and car elements are analyzed.

The second chapter presents the mathematical car model with mounted laser distance sensor, also model validation is performed. The developed model of compensation of body oscillations and the algorithm of electronically controlled suspension are described. The results are compared with passive and semi-active suspension.

The methods of experimental research and used equipment are presented in the chapter three. Experimental tests of laser sensor optimal mounting location and their results are presented. Experimental research of sprung mass oscillations compensation model and the developed suspension control algorithm are presented as well.

Eight scientific papers on the subject of the thesis have been published: three publications have been included in the Clarivate Analytics Web of Science journals, five – were published in other peer-reviewed journals. Four reports on the subject of the thesis have been presented at scientific conferences.

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160×240 mm
146 p.
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