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Multi-mode electromechanical variable transmission

  • US 9,651,120 B2
  • Filed: 02/17/2015
  • Issued: 05/16/2017
  • Est. Priority Date: 02/17/2015
  • Status: Active Grant
First Claim
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1. A drive system for a vehicle, comprising:

  • a first gear set including a first sun gear, a first ring gear, a first plurality of planetary gears coupling the first sun gear to the first ring gear, and a first carrier rotationally supporting the first plurality of planetary gears;

    a second gear set including a second sun gear, a second ring gear, a second plurality of planetary gears coupling the second sun gear to the second ring gear, and a second carrier rotationally supporting the second plurality of planetary gears, wherein the first carrier is directly coupled to the second carrier;

    a first electrical machine directly coupled to the first sun gear of the first gear set;

    a second electrical machine directly coupled to the second sun gear of the second gear set;

    a connecting shaft directly coupling an engine to the first ring gear of the first gear set;

    a driveshaft configured to transport power from the first electrical machine, the second electrical machine, and the engine to a tractive element of the vehicle; and

    a clutch selectively rotationally coupling the first carrier and the second carrier to the driveshaft when engaged,wherein the drive system is selectively reconfigurable into a neutral startup mode whereby rotation of the first electrical machine rotates the connecting shaft to start the engine.

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