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Trailer backup aid speed limiting via braking

  • US 9,840,240 B2
  • Filed: 09/11/2015
  • Issued: 12/12/2017
  • Est. Priority Date: 04/09/2015
  • Status: Active Grant
First Claim
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1. A trailer backup assist system for a vehicle reversing a trailer, comprising:

  • a brake system; and

    a controller configured to;

    generate a speed signal error by comparing a stored vehicle target speed with a vehicle speed input received from a speed detector;

    generate a brake torque request based on the speed signal error and a trailer mass; and

    output the brake torque request to the brake system;

    wherein the controller is further configured to calculate an estimated road grade of a surface on which the trailer is positioned;

    wherein the estimated road grade is determined by estimating a first total mass of the vehicle and trailer and comparing the first total mass to a second total mass of the vehicle and trailer that is estimated after movement of the trailer in a reverse direction from a first position to a second position;

    wherein the estimated road grade is based on the difference between the first and second total mass; and

    wherein the brake torque request is further based on the estimated road grade and a throttle application signal from a throttle sensor.

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