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Vehicle drive and method with electromechanical variable transmission

  • US 9,114,804 B1
  • Filed: 01/14/2014
  • Issued: 08/25/2015
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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1. A vehicle drive comprising:

  • a first gear set and a second gear set, wherein each gear set comprises a sun gear, a ring gear, and planetary gears, the planetary gears coupling the sun gear to the ring gear, wherein the planetary gears are rotatably supported by a planetary gear carrier;

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

    a second motor/generator selectively coupled to at least one of (a) the planetary gear carrier of the first gear set and (b) the ring gear of the first gear set, wherein the second motor/generator is electrically coupled to the first motor/generator by an electrical power transmission system, wherein the first motor/generator and the second motor/generator are electrically coupled without an energy storage device configured to at least one of (a) provide electrical energy to the first motor/generator or the second motor/generator to power the first motor/generator or the second motor/generator and (b) be charged by electrical energy from the first motor/generator or the second motor/generator;

    an engine coupled to the ring gear of the first gear set and selectively coupled to the second motor/generator;

    a first clutch configured to selectively engage the second motor/generator to the planetary gear carrier of the first gear set; and

    a second clutch configured to selectively engage the second motor/generator to the engine.

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