Development of a hydrostatic transmission with integrated supply for working hydraulics

The paper presents a study of a highly integrated hydraulic powertrain for mobile working machines. The highlight of this new concept is the replacement of separated drive and working pumps in conventional systems with only one displacement pump. After a comparison of different system architectures, the appropriate operating and control strategies for the chosen topology were applied and optimized. With the help of simulations in AMESim, a proof of the function of the hydraulic circuit and the controlling has been established. In addition, the energy saving potential of the integrated hydraulic system is also considered, by comparing the energy consumption of the new and the conventional powertrain in different duty cycles