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Hybrid propulsion system for road vehicles

  • US 6,170,587 B1
  • Filed: 10/15/1999
  • Issued: 01/09/2001
  • Est. Priority Date: 04/18/1997
  • Status: Expired due to Term
First Claim
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1. A hybrid propulsion system for use in vehicle operations, said propulsion system comprising:

  • (a) a power splitting mechanical transmission for coupling to a final drive of the vehicle;

    (b) a first drive unit arranged for regenerative operation and coupled to the power splitting mechanical transmission;

    (c) a second drive unit arranged for regenerative operation and coupled, independently of said first drive unit, to the power splitting mechanical transmission;

    (d) a non-regenerative third drive unit arranged in parallel to said power splitting mechanical transmission, for coupling to the final drive; and

    (e) propulsion control means for coordinating operation of the drive units in accordance with a plurality of predetermined modes corresponding to a driving cycle of said vehicle;

    wherein each of the first, second and third drive units includes a different type of energy storage means.

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