Axle misalignment method for a vehicle

• US 6,405,109 B1
• Filed: 07/19/2000
• Issued: 06/11/2002
• Est. Priority Date: 07/19/2000
• Status: Expired due to Fees

• Current Assignee: Meritor Heavy Vehicle Technology, LLC
• Original Assignee: Meritor Heavy Vehicle Technology, LLC
• Inventors: Huang, Jane, Kyrtsos, Christos
• Primary Examiner(s): Beaulieu, Yonel
• Application Number:
  US09/619,734
• Time in Patent Office: 692 Days
• Field of Search: 701/29, 701/37, 701/69, 701/74, 73/17.5, 731/46, 356/139.09
• US Class Current: 701/29
• CPC Class Codes: G01M 17/02 Tyres

Abstract

A method and system for determining axle misaligned and tire wear of a vehicle monitors lateral and vertical acceleration values. Lateral and vertical acceleration data for each axle is taken and this data is put into an equation. A ratio of the data for one axle divided by the data of another axle is calculated. If this ratio tends towards 1.0 the axles are more in alignment with respect to each other and there is likely less tire wear. As the ratio tends away from 1.0 the axles are more misaligned with respect to each other and there is likely more tire wear. The standard deviations of the vertical accelerations are also put into a ratio and can be used to predict how much wear the tires on one axle are experiencing as compared to the tires on the other axle. A gauge or monitoring device may be used to monitor the values to determine misalignment and predict tire wear. The monitoring device may send alignment and tire wear signals to a display, which indicates axle misalignment and tire wear of the vehicle.

Claims

1. A method of determining axle misalignment of a vehicle comprising:

(a) monitoring a value applied to an axle while a vehicle associated with the axle is being driven and is in motion; and

(b) using said monitored value for identifying axle misalignment.

2. A method as in claim 1, wherein a plurality of monitored values are taken.

4. A method as in claim 1, wherein step (a) includes monitoring a vertical acceleration value of an axle and a lateral acceleration value.

5. A method as in claim 4, wherein acceleration data of plural axles are used to determine misalignment.

6. A method as in claim 5, wherein the standard deviations of the vertical acceleration data of each axle is calculated.

7. A method as in claim 5, wherein the mean lateral acceleration values for each axle is calculated.

8. A method as in claim 7, wherein a final ratio is calculated.

9. A method as in claim 8, wherein said final ratio is calculated by comparing computations on said monitored values of one axle to monitored values of a second axle.

13. A method as in claim 6, wherein the standard deviations ratio is also used to predict tire wear of one axle as compared to another axle.

3. A method of determining axle misalignment of a vehicle comprising:

(a) monitoring an acceleration value of an axle in motion; and

(b) using said monitored value for identifying axle misalignment.

10. A method of determining axle misalignment of a vehicle comprising:

(a) monitoring a vertical acceleration value of plural axles and a lateral acceleration value;

(b) calculating mean lateral acceleration values for each axle;

(c) a final standard deviations ratio being calculated by comparing computations on said monitored values of one axle to monitored values of a second axle; and

(d) said mean lateral acceleration ratio is multiplied by said standard deviations ratio to determine said final ratio, and using said ratio for identifying axle misalignment.

11. A method as in claim 10, where a difference between said final ratio and the number 1.0 is evaluated.

12. A method as in claim 11, wherein said difference is used to predict a degree of axle misalignment and tire wear by comparison against experimentally predetermined values.