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Multi-mode electromechanical variable transmission

  • US 9,656,659 B2
  • Filed: 07/06/2015
  • Issued: 05/23/2017
  • 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 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 planetary gear carrier and the second planetary gear carrier are rotatably coupled;

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

    a second motor/generator 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 first clutch selectively rotationally coupling the first planetary gear carrier and the second planetary gear carrier to the drive axle when engaged; and

    a second 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 transition the multi-mode transmission between a mid range mode of operation and a high range mode of operation via an intermediate shift mode of operation;

    engage the brake and the first clutch to selectively reconfigure the multi-mode transmission into the mid range mode of operation; and

    engage the second clutch to couple the second motor/generator to the engine and maintain engagement of the brake and the first clutch to selectively reconfigure the multi-mode transmission from the mid range mode of operation to the intermediate shift mode of operation.

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