A METHOD TO COMPARE CONTROL LOSSES FOR VARIOUS MOBILE HYDRAULIC SYSTEMS

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.

• Supplemental Notes:
  • More Energy Saving Ideas for Mobile Equipment Designers SP-551. International Off-Highway Meeting and Exposition Milwaukee, Wisconsin, September 12-15, 1983.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Lonnemo, K R
• Publication Date: 1983-9

Media Info

• Features: Figures;
• Pagination: p. 15-20
• Serial:
  • Publication of: Pergamon Press Limited
  • Publisher: Pergamon Press, Incorporated

Subject/Index Terms

• TRT Terms: Alternatives analysis; Construction equipment; Control; Energy conservation; Hydraulic equipment; Losses; Pumps
• Old TRIS Terms: Hydraulic systems
• Subject Areas: Energy; Environment; Safety and Human Factors;

Filing Info

• Accession Number: 00381934
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 831272, HS-036 078
• Files: HSL, USDOT
• Created Date: Mar 30 1984 12:00AM