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Multi-mode electromechanical variable transmission

  • US 9,650,032 B2
  • Filed: 07/06/2015
  • Issued: 05/16/2017
  • Est. Priority Date: 02/17/2015
  • Status: Active Grant
First Claim
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1. A vehicle, comprising:

  • an engine;

    a drive axle;

    a multi-mode transmission selectively coupled to the engine and the drive axle, the multi-mode transmission including;

    a first gear set having a first planetary gear carrier and a second gear set having a second planetary gear carrier, wherein the first gear set is coupled to the engine, and wherein the first planetary gear carrier and the second planetary gear carrier are rotatably coupled;

    a first motor/generator coupled to the first gear set; and

    a second motor/generator electrically coupled to the first motor/generator with a bus, coupled to the second gear set, and selectively coupled to the engine;

    a brake positioned to selectively limit a rotational movement of a ring gear of the second gear set when engaged;

    a clutch selectively rotationally coupling the second motor/generator to the engine when engaged; and

    a controller coupled to the multi-mode transmission and configured to selectively configure the multi-mode transmission into an active neutral startup mode of operation in response to an engine start request by engaging the clutch and the brake such that at least one of the first motor/generator and the second motor/generator produces a voltage that is applied to the bus.

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