Electrohydraulic pressure control by a self-adjusting proportional derivative controller

Darko Lovrec (Author), Friedrich Faber (Author)

Abstract

The main characteristic of an electrohydraulic pump control system is the presence of an electrical signal path. It requires at least one sensor for the controlled value (in this case pressure), delivering feedback to be compared with the electrical or numerical reference in the controller. The additonal expense penalty for the sensor and the valve is offset by the advantage of flexibility in the structure and parameters of the controller in comparison to hydraulic - mechanical concepts. Thus, the transfer response can be adapted to demands, even in the operational state. Sophisticated control structures can be implemented easily in the form of computer or microcontroller programs. The layout of electrohydraulic pressure control discussed in this study includes the presented loading unit. The variable pump is designed to act together with a proportional valve having two metering edges. It is less expensive compared to the design with a synchronizing cylinder and four metering edges. However, only inferior static and dynamic performance can be expected. Hydraulic energy is supplied to the control valve directly from the output port of the pump - with the advantage of simple assembly, as there are no additional components required - but with the drawback that there is influence on the control loop`s properties at every change in the disturbance value or reference. The aim of the study presented in this paper is a more efficient and simple concept compared to other known methods for pressure control of the above mentioned pump including the dynamics of the distribution network, and also the characteristics of the hydraulic load with special focus on improvements in steady state and dynamic behaviour.

Keywords

avtomstska regulacija;elektrohidravlika;regulacija tlaka;samonastavljivi proporcionalni regulator;automatic control engineering;electrohydraulic systems;pressure control;self-adjusting proportional controller;

Data

Language:	English
Year of publishing:	2006
Typology:	1.01 - Original Scientific Article
Organization:	UM FS - Faculty of Mechanical Engineering
UDC:	681.527.3
COBISS:	10418966
ISSN:	0732-8818
Views:	1578
Downloads:	126
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary keywords:	avtomstska regulacija;elektrohidravlika;regulacija tlaka;samonastavljivi proporcionalni regulator;
URN:	URN:SI:UM:
Pages:	str. 57-63
Volume:	ǂVol. ǂ30
Issue:	ǂiss. ǂ3
Chronology:	May/June 2006
ID:	8717086