This paper investigates two most important points on velocity response and energy saving performance consisting of recovery energy and energy consumption of water hydraulic FST and PMT. The comparison between the experimental results of these two transmissions also will be presented in this research to get the conclusion for the advantages and disadvantages of each transmission. The PMT system has proved its many advantages such as reducing noise because of smooth operation; lengthening the life duration of the devices; and the drastic reducing of both steady state error in a working phase and energy consumption. The recovered energies of the both systems are almost same and get the values from 26.3 to 31.7% of the kinetic energy of flywheel
Keywords: Water hydraulic; fluid switching transmission; hydraulic pump motor transmission; velocity performance; energy saving; energy consumption
13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden
 B Hollingworth. The past; present and future of (water) hydraulics. Proc. of 12th Scandinavian International Conference on Fluid Power; SICFP’11; 2011.
 P N Pham; K Ito; and S Ikeo. The application of simple adaptive control for simulated water hydraulic servo motor system. Proc. of International Conference on Industrial Technology IEEE ICIT; 2013.
 K Ito. Control performance comparison of simple adaptive control to water hydraulic servo cylinder system. Proc. of 19th Mediterranean Conference on Control and Automation (MED); 2011.
 K Ito and S Ikeo. Robust velocity control of a water hydraulic servomotor system with parameter uncertainty. Proc. of SICE Annual Conference in Fukui; 2003.
 K Ito; H Takahashi; S Ikeo; and K Takahashi. Robust control of water hydraulic servo motor system using sliding mode control with disturbance observer. Proc. of SICE-ICASE International Joint Conference; 2006.
 P N Pham; K Ito; W Kobayashi; and S Ikeo. Analysis of velocity control performance and energy recovery efficiency of water hydraulic fluid switching transmission. Proc. of International Journal of Automation Technology; 6(4):457–467; 2012.
 M Linjama; M Huova; P Bostr¨om; A Laamanen; L Siivonen; L Morel; M Wald´e; and M Vilenius. Design and implementation of energy saving digital hydraulic control system. Proc. of The Tenth Scandinavian International Conference on Fluid Power; SICFP’07; 2007.
 K Sanada. A study on hils of fluid switching transmission. Proc. of SICE-ICASE International Joint Conference; 2006.
 K Ito; W Kobayashi; P N Pham; and S Ikeo. Control and energy saving performance of water hydraulic fluid switching transmission. Proc. of 12th Scandinavian International Conference on Fluid Power; SICFP’11; 2011.
 P N Pham; K Ito; W Kobayashi; and S Ikeo. Research on velocity error and energy recovery efficiency of water hydraulic fluid switching transmission. Proc. of 11th International Conference on Automation Technology; 2011.
 S Habibi and A Goldenberg. Design of a new high performance electrohydraulic actuator. Proc. of 1999 IEEE/ASME International Conference on Advanced Intelligent Mechatronics; 1999.
 Y Lin; Y Shi; and R Burton. Modeling and robust discrete-time sliding-mode control design for a fluid power electrohydraulic actuator (eha) system. Proc. of IEEE/ASME Transaction on Mechatronics; 18(1):1–10; 2013.
 H W Beaty and J L Kirtley. Electric Motor Hand Book. McGRAW-HILL; 1998.