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Multi-mode electromechanical variable transmission

  • US 10,029,555 B2
  • Filed: 05/15/2017
  • Issued: 07/24/2018
  • Est. Priority Date: 02/17/2015
  • Status: Expired due to Fees
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 movement of a portion 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 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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