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Vehicle drive and method with electromechanical variable transmission

  • US 9,821,789 B2
  • Filed: 06/17/2016
  • Issued: 11/21/2017
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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1. A vehicle drive comprising:

  • a gear set comprising 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 gear set;

    a second motor/generator selectively coupled to at least one of (a) the planetary gear carrier of the gear set and (b) the ring gear of the 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 gear set and selectively coupled to the second motor/generator;

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

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