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Low range drive ratio transfer changeover anti-rollback system and method

  • US 8,364,369 B2
  • Filed: 07/30/2010
  • Issued: 01/29/2013
  • Est. Priority Date: 07/30/2010
  • Status: Expired due to Fees
First Claim
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1. A vehicle anti-rollback method, comprising:

  • providing a vehicle that includes a pair of front wheels, a pair of rear wheels, a power unit, and a transmission connecting the power unit to at least one wheel of the front and rear wheels, the transmission including a plurality of forward drive ratios and at least one reverse drive ratio and a two speed gear reduction assembly configured to select between a high range drive ratio and a low range drive ratio when the transmission is in one of the plurality of forward drive ratios;

    sensing, using a controller, a vehicle rollback condition when the vehicle transmission is configured in a forward drive ratio; and

    the controller configured to execute the following functions;

    decreasing torque distributed from the power unit of the vehicle to the at least one wheel, and actuating a brake, when the rollback condition is sensed;

    executing drive ratio changeover from the high range drive ratio to the low range drive ratio after the decreasing of the torque and actuating of the brake; and

    increasing torque distributed from the power unit of the vehicle to the at least one wheel and releasing the brake after the low range drive ratio has been engaged.

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