Method and apparatus for wheel alignment audit

• US 5,583,797 A
• Filed: 11/03/1994
• Issued: 12/10/1996
• Est. Priority Date: 11/03/1994
• Status: Expired due to Term

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Motor Company
• Inventors: Fluegge, Jerry H., Mau, Erich, Mazzella, Michael C., Kumar, Prem R.
• Primary Examiner(s): Trammell, James P.
• Application Number:
  US08/333,918
• Time in Patent Office: 768 Days
• Field of Search: 364/552, 364/554, 364/551.01, 364/559, 364/560, 364/561, 356/155, 356/139.09, 33/203.18, 33/203.13, 33/203.12, 33/203.17, 33/203.15, 33/203.21, 348/94, 348/95, 29/273
• US Class Current: 700/279
• CPC Class Codes: G01B 11/2755 using photoelectric detection means
• CPC Class Codes: G01B 2210/14 One or more cameras or other optical devices capable of acquiring a two-dimensional image
• CPC Class Codes: G01B 2210/20 Vehicle in a state of translatory motion
• CPC Class Codes: G01B 2210/22 Wheels in a state of motion supported on rollers, rotating platform or other structure substantially capable of only one degree of rotational freedom

Abstract

A method and apparatus for auditing motor vehicle wheel alignment includes a sensor for passively detecting physical cartesian relationships of at least one wheel on each motor vehicle, and a test station positioned for serially addressing each of the plurality of motor vehicles. A programmed computer control calculates measurements in response to representative signals from the sensors to identify the conditions of caster, camber and toe on the vehicle. A programmed analyzer for processing statistical process control techniques generates statistical data responsive to calculated measurements from the program computer control. Preferably, the test station is conveniently located along the production line for continuous but non-invasive detection of vehicle compliance with a predetermined level of standard deviation. Preferably, a feedback control responsive to the calculated measurements can adjust production fixture specifications or alignment settings when the analyzer identifies a threshold level of variation from the standard deviation. In the preferred embodiment, the test station has a tire rotator to adjust the sensed data for run-out.

Claims

1. A wheel alignment auditing apparatus for an installed motor vehicle wheel for monitoring conditions of caster, camber and toe-in comprising:

a test station positioned for serially addressing each of a plurality of motor vehicles proceeding from a production line, said test station having at least one rotator for rotating said vehicle wheels in said test station;

at least one sensor for passively detecting physical cartesian relationships of at least one wheel on said each motor vehicle, and generating a representative signal;

a programmed computer control for calculating measurements for at least one of said conditions from said representative signal; and

a programmed analyzer for processing statistical process control (SPC) techniques to generate statistical data responsive to said measurements for identifying wheel alignment compliance with a predetermined level of standard deviation;

wherein said test station comprises a dual strand conveyer.

2. The invention as defined in claim 1 and further comprising:

a feedback control responsive to said calculated measurement for adjusting production machines for aligning said wheel when said analyzer identifies a predetermined level of variation from said predetermined level of deviation.

3. The invention as defined in claim 1 wherein said at least one sensor comprises a light source sensor.

4. The invention as defined in claim 3 wherein said sensor comprises a laser beam sensor.

5. The invention as defined in claim 3 wherein said sensor comprises a LIDAR sensor.

6. The invention as defined in claim 1 wherein said at least one sensor comprises a microwave sensor.

7. The invention as defined in claim 1 wherein said at least one sensor comprises an ultrasonic sensor.

8. The invention as defined in claim 1 wherein said test station comprises a dynamometer roll test station.

9. The invention as defined in claim 1 and further comprising an automated displacement support for said sensor.

10. A method for auditing motor vehicle wheel alignment comprising:

rotating a motor vehicle mounted wheel at a test station;

passively sensing physical cartesian relationships of said motor vehicle wheel as it rotates and generating a responsive signal for each sensed relationship;

calculating a measurement for at least one of said conditions from said responsive signal;

processing statistical process control techniques including identifying a tested vehicle wheel'"'"'s compliance with a predetermined level of standard deviation;

calculating a first output for communicating a particular vehicle compliance condition at a production line work station; and

determining a production analysis for selecting said predetermined level of standard deviation.

11. The invention as defined in claim 10 wherein said method comprises adjusting equipment for a subsequently produced vehicle wheel by signalling a feedback signal from said processing.

12. The invention as defined in claim 10 wherein said rotating step comprises transferring said motor vehicle along a conveyor strand.

13. A wheel alignment auditor for motor vehicle production comprising:

a passive test station on a production line for serially addressing each of the production vehicles;

a non-contact sensor for passively detecting physical cartesian relationships of caster, camber and toe-in, and generating a representative signal for each of said detected physical relationships;

a computer controlled calculator for determining measurements from said representative signals;

a processor for statistical process control techniques to generate statistical data responsive to said measurements for identifying compliance with a predetermined level of standard deviation;

an adjuster for realigning production specifications in response to identification of a threshold of compliance outside a predetermined level of compliance; and

feedback control to a remote station off-line from said production line for repair of selected motor vehicles from production.

14. A wheel alignment auditing apparatus for an installed motor vehicle wheel for monitoring conditions of caster, camber and toe-in comprising:

a test station positioned for serially addressing each of a plurality of motor vehicles proceeding from a production line, said test station having at least one rotator for rotating said vehicle wheels in said test station;

at least one sensor for passively detecting physical cartesian relationships of at least one wheel on said each motor vehicle, and generating a representative signal;

a programmed computer control for calculating measurements for at least one of said conditions from said representative signal; and

a programmed analyzer for processing statistical process control (SPC) techniques to generate statistical data responsive to said measurements for identifying wheel alignment compliance with a predetermined level of standard deviation;

wherein said at least one sensor comprises a LIDAR light source sensor.

15. A wheel alignment auditing apparatus for an installed motor vehicle wheel for monitoring conditions of caster, camber and toe-in comprising:

a test station positioned for serially addressing each of a plurality of motor vehicles proceeding from a production line, said test station having at least one rotator for rotating said vehicle wheels in said test station;

at least one sensor for passively detecting physical cartesian relationships of at least one wheel on said each motor vehicle, and generating a representative signal;

a programmed computer control for calculating measurements for at least one of said conditions from said representative signal; and

a programmed analyzer for processing statistical process control (SPC) techniques to generate statistical data responsive to said measurements for identifying wheel alignment compliance with a predetermined level of standard deviation;

wherein said at least one sensor comprises a microwave sensor.

16. A wheel alignment auditing apparatus for an installed motor vehicle wheel for monitoring conditions of caster, camber and toe-in comprising:

a test station positioned for serially addressing each of a plurality of motor vehicles proceeding from a production line, said test station having at least one rotator for rotating said vehicle wheels in said test station;

at least one sensor for passively detecting physical cartesian relationships of at least one wheel on said each motor vehicle, and generating a representative signal;

a programmed computer control for calculating measurements for at least one of said conditions from said representative signal; and

a programmed analyzer for processing statistical process control (SPC) techniques to generate statistical data responsive to said measurements for identifying wheel alignment compliance with a predetermined level of standard deviation;

wherein said at least one sensor comprises an ultrasonic sensor.