Multi-Objective Control of a Self-locking Compact Electro-Hydraulic Cylinder Drive

Nikolaj Grønkær*, Lasse Nørby Nielsen, Frederik Ødum Nielsen, Søren Ketelsen, Lasse Schmidt

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Abstrakt

The field of self-contained linear hydraulic drives based on variable-speed electrical motors and fixed displacement pumps is gaining interest from both industry and academia. Some of the main reasons for this is the possibility to improve the energy efficiency of such drives compared to conventional valve controlled drives, and the possibility for electrical regeneration allowing power sharing between multiple drives. The main drawback for such types of drive concepts is a low pressure in the non-load carrying cylinder chamber. This induces a low drive stiffness limiting the achievable drive bandwidth and hence the application range. However, a so-called self-locking compact drive architecture recently proposed allow to maintain a proper drive stiffness by virtue of separate forward and return flow paths, combining the advantages of efficient flow control into the cylinder and a throttle driven flow out of the cylinder. The multiple inputs available in this architecture allows the control to target several objectives concurrently. The purpose of the study presented is to analyse the dynamic couplings between the control objectives via relative gain array (RGA) methods, and the realization of input- and output transformations effectively decoupling relevant dynamic interactions. These transformations allow the usage of simple SISO-controllers for each control objective, and a method for controlling motion and fluid temperature concurrently, is proposed and experimentally verified.
OriginalsprogEngelsk
Titel12th International Fluid Power Conference
StatusAfsendt - mar. 2020
Begivenhed12th International Fluid Power Conference - Dresden, Tyskland
Varighed: 9 mar. 202011 mar. 2020

Konference

Konference12th International Fluid Power Conference
LandTyskland
ByDresden
Periode09/03/202011/03/2020

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Citationsformater

Grønkær, N., Nielsen, L. N., Nielsen, F. Ø., Ketelsen, S., & Schmidt, L. (2020). Multi-Objective Control of a Self-locking Compact Electro-Hydraulic Cylinder Drive. Manuskript afsendt til publicering. I 12th International Fluid Power Conference