Method for verifying tires of vehicles in the driving state

• US 6,594,558 B1
• Filed: 01/22/2002
• Issued: 07/15/2003
• Est. Priority Date: 12/30/1999
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schmitt, Johannes
• Primary Examiner(s): BEAULIEU, YONEL
• Application Number:
  US09/914,559
• Time in Patent Office: 539 Days
• Field of Search: 701/1, 701/29, 701/34, 701/35, 701/37, 731/462, 340/442, 340/425.5
• US Class Current: 701/1
• 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: B60T 2240/03 Tire sensors

Abstract

In a method for checking tires of vehicles during driving, signals which provide information about an adhesion between the tire and the roadway in the vertical direction with respect to the roadway are detected by sensors provided at the tire. The signals are evaluated in an evaluation unit with respect to their amplitude, such that the amplitude characteristic for the detected signals can indicate a disturbance occurring at the tire. An occurrence of a disturbance is indicated on a display unit and is stored for diagnostic purposes.

Claims

1. A method for checking a behavior of a vehicle during driving, comprising:

causing sensors provided at a tire to detect signals providing information about an adhesion between the tire and a roadway in a vertical direction with respect to the roadway;

comparing, in an evaluation unit, amplitude characteristics of the detected signals to a selected one of a plurality of different characteristic curves of the tire; and

determining a disturbance occurring at the tire based on the comparison.

2. The method according to claim 1, further comprising:

comparing in the evaluation unit the amplitude characteristics of the detected signals to a previously stored amplitude characteristic curve for a normal state of the tire in order to determine an amplitude deviation.

3. The method according to claim 1, further comprising:

comparing in the evaluation unit an amplitude of one of the detected signals to an amplitude of another signal detected directly before the one of the detected signals, in order to determine a sudden change in amplitude.

4. The method according to claim 1, further comprising:

comparing in the evaluation unit an amplitude of one of the detected signals to an amplitude of another signal detected by another sensor at another tire, in order to determine an amplitude difference between the one of the detected signals and the detected other signal.

5. The method according to claim 1, further comprising:

in the evaluation unit, comparing the amplitude characteristics of the detected signals to amplitude characteristic of other signals detected at at least one other tire.

6. The method according to claim 1, further comprising:

evaluating the amplitude characteristics of the detected signals, and performing the comparing for a predetermined number of periods corresponding to a number of revolutions of the tire.

7. The method according to claim 6, wherein:

the predetermined number of periods is set in a counter.

8. The method according to claim 1, further comprising a performance of at least one of the steps of:

causing a display unit to indicate the disturbance to a driver; and

supplying a signal indicative of the disturbance to an engine management to possibly influence the engine management.

9. The method according to claim 8, wherein:

the display unit indicates a recommendation for a further driving to the driver.

10. The method according to claim 1, further comprising the step of:

upon determining the disturbance at the tire, storing a diagnostic entry for a service station in a memory.

11. The method according to claim 1, wherein each of the plurality of different characteristic curves corresponds to a different tire internal pressure.