ENERGY REGENERATION AND CONVERSION EFFICIENCY IN A HYDRAULIC HYBRID PROPULSION SYSTEM

An energy storage system having a limited capacity is employed for the purpose of (i) removing the burden of acceleration from internal and external-combustion type prime movers used in rubber-tired and rail urban mass transit vehicles and (ii) providing an efficient regenerative braking system to significantly increase fuel economy during typical stop-start vehicle schedules. Energy is stored in a hydraulic accumulator which is designed to be an integral part of the propulsion system. Data from laboratory tests are presented to indicate achievable energy conversion efficiencies. Computer simulation of various size vehicles being driven over typical transit-vehicle schedules is used to estimate the reduction in vehicular emissions ans energy consumption resulting from the energy storage capability. An increase in fuel economy of up to 30% and an emissions reduction of up to 36% (NO sub x) were observed for the spark-ignited prime mover. When a simple cycle, single shaft gas turbine was simulated, the maximum increase in fuel economy was 24% with up to 50% reduction in emissions.

  • Corporate Authors:

    Planning Transport Associates, Incorporated

    P.O. Box 4824, Duke Station
    Durham, NC  United States  27706
  • Authors:
    • Wojciechowski, P H
    • Dunn, H
  • Publication Date: 1975

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00095264
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jul 15 1981 12:00AM