THE TRANSITION FROM HYDRAULIC TO HYBRID SERVO SYSTEMS - A WAY TO SAVE ENERGY

The paper presents the dynamic analysis of the modern electrohydraulic, hybrid and electromechanical control systems used for driving industrial equipment, and a realistic analysis of the most adequate type of driving system for different applications. The real performances of a classical electrohydraulic steering systems are considered as reference for a new type of hybrid steering system. Both of them were designed and tested by the authors with the support of an aerospace manufacturing company. The preliminary tests have shown that the new system can be used for steering small and medium size hybrid cars.