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Binary clutch assembly control in neutral-to-drive or neutral-to-reverse transmission shifts

  • US 9,200,686 B2
  • Filed: 10/25/2012
  • Issued: 12/01/2015
  • Est. Priority Date: 10/25/2012
  • Status: Active Grant
First Claim
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1. A vehicle comprising:

  • an internal combustion engine; and

    a transmission having;

    a plurality of gear sets each having a plurality of nodes;

    an input member that is continuously connected to the engine and to one of the gear sets;

    a binary clutch assembly that is connected to the same gear set as the input member, wherein the binary clutch assembly has just two possible states;

    fully applied and fully released; and

    a controller in communication with the engine and with the binary clutch, wherein the controller includes a processor that is operable to;

    detect a requested shift of the transmission from a neutral state to one of a reverse and a drive state;

    command, via the processor, a calibrated energy pulse from the engine to the input member in response to the detected requested shift, wherein the calibrated energy pulse is a calibrated speed pulse or a calibrated torque pulse that has a rate of increase sufficient for reducing slip across the binary clutch assembly to a target slip of approximately zero; and

    apply the binary clutch assembly a calibrated duration after commanding the calibrated energy pulse.

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