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Output split electrically-variable transmission with electric propulsion using one or two motors

  • US 7,867,124 B2
  • Filed: 09/10/2007
  • Issued: 01/11/2011
  • Est. Priority Date: 09/10/2007
  • Status: Expired due to Fees
First Claim
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1. An electrically-variable transmission (EVT) comprising:

  • an input member configured for operative interconnection with an engine;

    an output member;

    a stationary member;

    first and second motor/generators;

    a planetary gear set representable by a first three-node lever having a first, a second, and a third node; and

    a first and a second torque-transmitting mechanism that are selectively engagable alone or in different combinations for establishing an electric-only mode, a series mode, an output split mode, and a neutral mode, wherein said first torque-transmitting mechanism is selectively engagable to connect said third node to said stationary member, and wherein said second torque-transmitting mechanism is selectively engagable to connect said first motor/generator to said third node;

    wherein one of said first and said second torque-transmitting mechanisms is selectively disengagable to disconnect said engine from said third node to enable start of said engine when said engine is disconnected from said EVT; and

    wherein engagement of said first torque-transmitting mechanism establishes said electric-only mode and said series mode, engagement of said second torque-transmitting mechanism establishes said output split mode, and disengagement of said first and said second torque-transmitting mechanisms establishes said neutral mode.

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