Method and system for detecting misalignment of a front end accessory drive belt

Patent metadata

Field	Value
Publication number	US-10774739-B2
Application number	US-201815876405-A
Country	US
Kind code	B2
Filing date	Jan 22, 2018
Priority date	Jan 22, 2018
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

The present discloser is directed toward a method for detecting misalignment of a belt for a front end accessory drive system. The method includes acquiring, by a plurality of optical sensors, multiple images of the belt arranged on a series of pulleys of the drive system. The belt includes a contrast element that is detectable by the optical sensors system and is visually distinct from a color of the belt. The method further includes analyzing, by way of a controller, data indicative of the acquired images to determine whether the contrast element is present in the captured images, and identifying the belt as being misaligned in response to the contrast element being in at least one of the acquired images.

First claim

What is claimed is:

1. A method for detecting misalignment of a belt for a front end accessory drive system, the method comprising:
acquiring, by a plurality of optical sensors, multiple images of the belt arranged on a series of pulleys of the drive system, wherein the optical sensors are disposed external of the drive system, and the belt includes a contrast element that is detectable by the optical sensors and is visually distinct from a color of the belt;
analyzing, by way of a controller, data indicative of the acquired images to determine whether the contrast element is present in the captured images; and
identifying the belt as being misaligned in response to the contrast element being in at least one of the acquired images.

2. The method of claim 1 , wherein the optical sensors are digital cameras, and the digital cameras are arranged to capture images of different viewpoints of the belt at one or more of the pulleys of the drive system.

3. The method of claim 1 , wherein the contrast element is a color feature that is detectable by the optical sensors and is disposed within or on the belt.

4. The method of claim 1 , wherein the acquiring the multiple images further comprises having a first optical sensor acquire a first image of a first pulley among the series of pulleys with the belt arranged on the first pulley to assess misalignment of the belt with respect to the first pulley, wherein the first camera is positioned to capture an image of a rim of the first pulley and a first surface of the belt.

5. The method of claim 4 , wherein the analyzing the acquired images further comprises determining whether the contrast element is present in the first image, wherein the contrast element is disposed within the belt and is detectable by the first camera when the belt is positioned on the rim.

6. The method of claim 1 further comprising having the drive system in a stationary state.

7. The method of claim 1 further comprising estimating a strain level of the belt in response to determining that the contrast element is present in the acquired image, wherein the contrast element is a color feature that varies based on the amount of strain applied to the belt due to the misalignment, and the estimation of the strain level is based on a color of the contrast element and pre-stored data correlating different colors to predefined strain levels.

8. The method of claim 7 , wherein the identifying the belt as being misaligned further comprises: determining the belt is misaligned when the amount of strain is greater than or equal to a strain threshold.

9. The method of claim 1 , wherein the acquiring the multiple images further comprises having a first camera of the image sensor system acquire a first image of a front face of a first pulley to assess misalignment of the belt with respect to a seat of the first pulley upon which the belt is positioned.

10. The method of claim 9 , wherein the analyzing the acquired images further comprises determining whether the contrast element is present along an edge of the belt wherein the contrast element is provided along an edge of the belt and is detectable by the first camera when the belt is positioned offset from the seat of the first pulley and is undetectable when the belt is aligned with the seat of the first pulley.

11. The method of claim 1 further comprising installing the belt on the drive system for a vehicle.

12. The method of claim 1 further comprising generating and outputting a notification in response to the belt being misaligned.

13. An alignment detection system for detecting misalignment of a belt installed on a front end accessory drive (FEAD) system, the alignment detection system comprising:
a plurality of digital cameras arranged to capture images of the belt arranged on multiple pulleys of the FEAD system, wherein the digital cameras are configured to detect a contrast element on the belt, the contrast element is visible to the digital cameras and is visually distinct from the belt; and
a controller configured to process data indicative of the images captured to determine whether the belt is misaligned on the FEAD system, wherein the controller determines that the belt is misaligned in response to the contrast element being captured in one or more of the images, and the belt is determined as being aligned in response to the contrast element being absent in the images captured.

14. The system of claim 13 , wherein:
one or more digital cameras from among the plurality of digital cameras are arranged to capture images of a front face of one or more pulleys among the multiple pulleys of the FEAD system to detect misalignment of the belt with respect to the one or more pulleys, and
the controller is configured to determine that the belt is misaligned in response to the contrast element being detected along an edge of the belt in at least one image captured by the one or more digital cameras.

15. The system of claim 13 , wherein one or more digital cameras from among the plurality of digital cameras are arranged to capture images of a rim of one or more pulleys among the multiple pulleys and a first surface of the belt arranged on the one or more pulleys, wherein the first surface is opposite to a second surface of the belt, and the second surface is in contact with a surface of a respective pulley of the one or more pulleys.

16. The system of claim 15 , wherein the controller is configured to determine that the belt is misaligned in response to the contrast element being detected at the first surface of the belt in at least one image captured by the one or more digital cameras.

17. The system of claim 13 , wherein the digital cameras are arranged to capture images of a planar side of the belt at one or more pulleys among the multiple pulleys, wherein the belt has a ribbed side opposite the planar side, and the ribbed side is in contact with the one or more pulleys.

18. A belt misalignment detection method for a vehicle comprising:
capturing, by multiple digital cameras, images of the belt arranged on multiple pulleys of an accessory drive system, wherein the belt includes a contrast element visible by the cameras;
analyzing data indicative of the images to determine whether the contrast element is present in the captured images; and
identifying the belt as misaligned when the contrast element is detected in at least one of the images.

19. The method of claim 18 further comprising arranging one or more of the multiple digital cameras to capture images of a planar side of the belt at one or more pulleys among the multiple pulleys, wherein the belt has a ribbed side opposite the planar side, and the ribbed side is in contact with the one or more pulleys.

20. The method of claim 18 , wherein the contrast element is a color feature that is detectable by the digital cameras and is disposed within or on the belt.

Assignees

• Ford Motor Co

Inventors

• Breneman Matthew

Classifications

• G06V10/24

  Aligning, centring, orientation detection or correction of the image · CPC title

• G06V10/147

  Details of sensors, e.g. sensor lenses (fingerprint or palmprint sensors G06V40/13; vascular sensors G06V40/145; eye sensors G06V40/19) · CPC title

• F02B67/06 Primary

  driven by means of chains, belts, or like endless members · CPC title

• G01M13/023

  Power-transmitting endless elements, e.g. belts or chains · CPC title

• G06T7/73

  using feature-based methods · CPC title