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Automated transmission systems

  • US 7,212,899 B2
  • Filed: 09/29/2006
  • Issued: 05/01/2007
  • Est. Priority Date: 01/18/2003
  • Status: Active Grant
First Claim
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1. An automated transmission for a vehicle comprising a multi-ratio gear box connected to an engine by means of a transmission clutch, a transmission brake acting on a component of the transmission between the transmission clutch and the driven wheels of the vehicle, an electronic control unit, means for sensing actuation of the transmission brake and sending a signal indicative thereof to the control unit, means for sensing the engine torque and sending a signal indicative thereof to the control unit, means for sensing the vehicle speed and sending a signal indicative thereof to the control unit, means for sensing whether a gear downshift is requested or in operation and sending a signal indicative thereof to the control unit, and means for sensing whether an operating brake of the vehicle is applied and sending a signal indicative thereof to the control unit;

  • characterized in that the control unit controls operation of the transmission brake to apply a braking torque to the transmission, if the engine torque is negative, the vehicle speed is above a predetermined value, a gear downshift has been requested or is in progress and the operational brakes of the vehicle are not applied.

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