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 20160200155A1
• Filed: 07/18/2014
• Published: 07/14/2016
• Est. Priority Date: 08/01/2013
• Status: Active Grant

• Current Assignee: Volkswagen AG
• Original Assignee: Volkswagen AG
• Inventors: STEINMEYER, Simon, MEINECKE, Marc-Michael, DEGERMAN, Pr, DEEG, Carsten
• Granted Patent: US 10,391,823 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60C 23/0486 comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
• CPC Class Codes: B60C 23/06 Signalling devices actuated by deformation of the tyre , e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
• CPC Class Codes: B60C 23/061 by monitoring wheel speed measuring distance traversed on the ground by vehicles G01C22/00

Abstract

A pressure deviation between a setpoint tire pressure and an actual tire pressure for a tire of a vehicle is determined by the following steps:

Ascertaining a wheel load for the tire.

Ascertaining a dynamic tire radius of the tire.

Determining the pressure deviation as a function of the wheel load and the dynamic tire radius.

Claims

1-9. -9. (canceled)

10. A method for determining a pressure deviation between a setpoint tire pressure and an actual tire pressure for a tire of a vehicle, comprising:

ascertaining a wheel load for the tire;

ascertaining a dynamic tire radius of the tire; and

determining the pressure deviation as a function of the wheel load and the dynamic tire radius.

11. The method according to claim 10, wherein the setpoint tire pressure is determined as a function of the wheel load using a setpoint tire pressure function.

12. The method according to claim 10, wherein a non-loaded tire radius of the tire is specified in a non-loaded state, and the actual tire pressure is calculated as a function of the wheel load, the non-loaded tire radius, and the dynamic tire radius using a tire rigidity function.

13. The method according to claim 12, wherein:

the tire rigidity function is specified, by which it is possible 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

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.

14. The method according to claim 13, wherein the actual tire pressure is regarded as a constant and is also learned when the constants are learned.

15. The method according to claim 12, wherein:

the tire rigidity (m) is determined using the tire rigidity function; and

the non-loaded tire radius (r₀) is ascertained by the following equation as a function of the dynamic tire radius (r_dyn), the wheel load (f), and the tired rigidity (m);

r₀=r_dyn+m*f

16. The method according to claim 12, wherein:

an ideal dynamic tire radius is specified; and

the setpoint tire pressure is determined as a function of the ideal dynamic tire radius using the tire rigidity function.

19. The system according to claim 18, wherein the system is adapted to perform the method recited in claim 10.

21. The method according to claim 10, wherein the method is performed by the system recited in claim 18.

17. A method for determining a wheel load for a tire of a vehicle, comprising:

ascertaining an actual tire pressure;

ascertaining a dynamic tire radius of the tire;

specifying a non-loaded tire radius of the tire in a non-loaded state; and

determining the wheel load for the tire as a function of the actual tire pressure, the dynamic tire radius, and the non-loaded tire radius using a tire rigidity function.

20. The system according to claim 18, wherein the system is adapted to perform the method recited in claim 17.

22. The method according to claim 17, wherein the method is performed by the system recited in claim 18.

18. A system for determining a pressure deviation between a setpoint tire pressure and an actual tire pressure for a tire of a vehicle, comprising:

a control device adapted to ascertain a dynamic tire radius of the tire, to ascertain a wheel load for the tire, and to determine the pressure deviation as a function of the wheel load and the dynamic tire radius.

23. A vehicle, comprising the system recited in claim 18.