A practical scheme to operate a fleet of city buses on hydrogen is being studied by Daimler-Benz at the Metal Physics section of its R&D department in Stuttgart. It features a duplex gas storage system using a low-temperature metal hydride (TiFe-hydride) for cold starts and warm-up operation, and a high-temperat5ure one (Mg//2Ni-hydride) of greater absorption capacity for normal running. This could give the vehicles a range of 400 km on one charge. The hydrogen project offers environmental benefits since there are virtually no engine exhaust emissions. Only minor engine modifications are needed, and combustion efficiency and performance are the same as, or even better than, with gasoline, according to Daimler-Benz, air conditioning or heating could be provided as a by-product without any additional equipment or power drain, and can function even with the engine stopped. On a mileage/weight basis, metal hydrides have five or six times the energy density of lead-acid batteries, but only about 5.5% to 22.5% that of gasoline. On this basis hydrogen is not competitive, and can be regarded as an alternate fuel only in special situations.

Media Info

  • Pagination: p. 78-81
  • Serial:
    • Automotive Engineering
    • Volume: 86
    • Issue Number: 5
    • Publisher: Society of Automotive Engineers (SAE)
    • ISSN: 0098-2571

Subject/Index Terms

Filing Info

  • Accession Number: 00183255
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Dec 12 1978 12:00AM