The basic power system consists of a flywheel, a differential planetary transmission, a ring generator/motor, a carrier motor/generator, (both the last units are physically identical) a battery pack, and a controller. The flywheel, the generator/motor, and the motor/generator are linked mechanically through the three power paths of the planetary gear set and function together as an infinitely variable electromechanical transmission. A numerical analysis technique, a modified Newton-Raphson iteration process, was used to solve simultaneous nonlinear equations. A simple, two-step, successive approximation method was used for the integration subroutine. The system was programmed in FORTRAN language on the UNIVAC 1100 digital computer. The expression for the lead acid battery accounts for the so-called recuperated effect, allowing for the connection between instantaneous discharge rate and fast time-averaged discharge rate. The complete simulation program evolves from the torque balance; however, by accumulating the total energy at the completion of a driving cycle, or at any instant of time, the input always equates with the output. In other words, at the end of a cycle, the battery energy consumed is equal to the road load that has been overcome plus the sum of system component losses and any net flywheel kinetic energy variation.

  • Supplemental Notes:
    • Preprint for meeting held February 27-March 3, 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Chang, M
  • Publication Date: 1978

Media Info

  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00180076
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: SAE 780217 Preprint
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM