Control and Experimental Evaluation of Speed-variable Switched Differential Pump Concept
Translated title
Kontrol og Eksperimentel Evaluering af Hastighedsvariabel Skiftende Differential Pumpe Koncept
Authors
Term
4. term
Education
Publication year
2015
Submitted on
2015-06-09
Pages
150
Abstract
The Speed-variable Switched Differential Pump Concept (SvSDP) is a continuation of the en- ergy efficient hydraulic Speed-variable Differen- tial Pump (SvDP) concept original proposed by Bosch Rexroth A/S. The SvSDP consist of three gear pumps driven by a single electric motor connected directly to the inlet and outlet ports of differential cylinders. A SvSDP system is designed and dimensioned. To allow for gen- eral evaluation of the concept, a multi-purpose test bench for hydraulic systems is also designed and constructed. A detailed, non-linear dynamic model of the system is developed, and the pa- rameterization of the model is conducted based on experimental results. The model is linearized and Relative Gain Array (RGA) analysis is used to identify the amount of cross couplings in the system. It is found that decentralized control of the system is not immediately applicable, why decoupling strategies are investigated. No ex- perimental verification is made of the designed closed loop control systems, but from simulation results it is found, that the decoupled control strategy gives acceptable and consistent perfor- mance of the closed loop system. The simulated closed loop position tracking shows maximum tracking errors of less that 3 mm even for non- realizable ramp trajectories.
Keywords
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