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Power train for hybrid electric vehicles and method of controlling the same

  • US 20070287564A1
  • Filed: 12/04/2006
  • Published: 12/13/2007
  • Est. Priority Date: 06/09/2006
  • Status: Active Grant
First Claim
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1. A power train having dual modes for hybrid electric vehicles, comprising:

  • an engine;

    a first planetary gear set, comprising a first ring gear coupled to the engine;

    a first motor generator coupled to a sun gear of the first planetary gear set;

    a second planetary gear set;

    a first clutch to couple or decouple the first sun gear of the first planetary gear set to or from a second sun gear of the second planetary gear set;

    a second clutch to convert the second sun gear of the second planetary gear set between a stationary state and a rotatable state; and

    a second motor generator, whereina first carrier of the first planetary gear set is coupled to a drive wheel through one operational element of the second planetary gear set, and the second motor generator is coupled to another operational element of the second planetary gear set.

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