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Method and system for determining a pressure deviation between a setpoint tire pressure and an actual tire pressure for a tire of a vehicle as well as for determining a wheel load

  • US 10,391,823 B2
  • Filed: 07/18/2014
  • Issued: 08/27/2019
  • Est. Priority Date: 08/01/2013
  • Status: Active Grant
First Claim
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1. A method for indicating a vehicle tire pressure, the vehicle including a control device, a force sensor, wheel sensor, and a display, the method comprising:

  • ascertaining, by the force sensor, a wheel load for the tire;

    ascertaining, by the wheel sensor, a dynamic tire radius of the tire; and

    determining, by the control device, a pressure deviation as a function of the wheel load and the dynamic tire radius;

    wherein a non-loaded tire radius of the tire is specified in a non-loaded state, and the actual tire pressure is calculated, by the control device, as a function of the wheel load, the non-loaded tire radius, and the dynamic tire radius using a tire rigidity function;

    wherein the tire rigidity function is specified, and the control device is configured to calculate a tire rigidity of the tire as a function of the wheel load, the actual tire pressure, and a velocity, at which the vehicle is currently traveling; and

    wherein constants of the tire rigidity function are learned in that measured values for the velocity and the wheel load are ascertained for multiple points in time and in that for these measured values the constants are determined such that an estimation error is minimized; and

    displaying, on the display, a setpoint tire pressure and the actual tire pressure.

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