1983-09-12

A Method to Compare Control Losses for Various Mobile Hydraulic Systems 831272

This paper describes a method to determine control losses, i.e., losses solely due to regulation of velocity of the load, for various variable pump systems as compared to conventional fixed pump-open center, by-pass valve systems.
The method is graphically illustrated in load pressure-flow diagrams where the different control losses are shown.
Loci of comparative control losses are plotted in the load pressure-flow diagram and if the pressure-flow-time duty cycle is known, the total difference in control energy loss/duty cycle can be computed for a particular machine.
This energy loss is then converted to the difference (gain or loss) in fuel consumption and cooling requirements.
Finally, results from test runs with a backhoe-loader and three different operators are shown.

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