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Hydraulic/Electric Synergy
 
Similarity:
Hydrostatic and electric transmission are similar in the efficiency dependence on to the pressure/tension & flow/current variation. For both systems, the efficiency will be reduced with the reduction of the pressure/tension and augmentation of the flow/current.

 

Difference:

As hydrostatic transmission provides high torque/low speed with high pressure/low flow it will be more efficient in high load operation than electric transmission. On the contrary, electric transmission will be more efficient in high speed operation as low torque/high speed are generated with high tension/low current.

 

Synergy:

Using hydrostatic transmission in high load operations (acceleration/deceleration) and electric transmission in high speed operation (highway) maximum from booth systems will be obtained.

 

Potentials: 

Potentials of the synergy between hydraulic and electric systems are explained thorough the line of the constant power of the imagined transmission of 50 kW with top speed of 140 km/h (39 m/s). Speed of the car, tension in electric and flow in hydraulic transmission are aligned on the x axis while the force needed to maintain the speed, current in electric and pressure in hydraulic transmission are aligned as y axis. Therefore direct comparison of the parameters in electric and hydraulic transmission is possible. Reading for the high speed/low torque is presented by the dash-dot line.

 
Data for calculation are obtained from: R. H. Staunton et al., “Evaluation of 2004 Toyota Prius Hybrid Electric  Drive System”, Prepared by ; Oak Ridge National Laboratory (Mitch Olszewski), May 2005
10. “Hydraulic Motors Series V12, V14, T12-Variable Displacement” Catalog HY17-8223/UK, November 2004.
 
  
 


 

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