Machine vision for predictive suspension

• US 7,872,764 B2
• Filed: 10/15/2008
• Issued: 01/18/2011
• Est. Priority Date: 10/16/2007
• Status: Active Grant

• Current Assignee: Magna Electronics Incorporated (Magna International Incorporated)
• Original Assignee: Magna Electronics Incorporated (Magna International Incorporated)
• Inventors: Higgins-Luthman, Michael J., Lu, Yuesheng, Gebauer, Duane W.
• Primary Examiner(s): Toatley; Gregory J
• Assistant Examiner(s): Underwood; Jarreas C
• Application Number:
  US12/251,672
• Publication Number:
  US 20090097038A1
• Time in Patent Office: 825 Days
• Field of Search: 356600-640
• US Class Current: 356/602
• CPC Class Codes: B60G 17/0165 to an external condition, e.g. rough road surface, side wind
• CPC Class Codes: B60G 17/019 characterised by the type of sensor or the arrangement thereof B60G17/01941 takes precedence
• CPC Class Codes: B60G 2400/82 Ground surface
• CPC Class Codes: B60G 2401/00 Indexing codes relating to the type of sensors based on the principle of their operation
• CPC Class Codes: B60G 2401/142 Visual Display Camera, e.g. LCD

Abstract

A predictive suspension system for a vehicle includes an imaging sensor, and energy source and a control. The imaging sensor is disposed at a vehicle and has a generally downward field of view, with the field of view encompassing an area forward of a tire of the vehicle. The energy source is operable to emit illumination in at least one linear pattern so that the linear pattern is projected onto a portion of the area forward of the tire of the vehicle that is encompassed by the field of view of the imaging sensor. The control processes image data captured by the imaging sensor and detects surface irregularities on a surface in front of the vehicle tire in response to the image processing.

Claims

1. A predictive suspension system for a vehicle, said predictive suspension system comprising:

an imaging sensor disposed at a vehicle and having a generally downward field of view, said field of view encompassing an area forward of a tire of the vehicle;

an energy source operable to emit illumination in at least one linear pattern so that said at least one linear pattern is projected onto a portion of the area forward of the tire of the vehicle that is encompassed by said field of view of said imaging sensor, wherein said energy source is operable to emit two line segment patterns of illumination in a cross-hair; and

a control for processing image data captured by said imaging sensor and detecting surface irregularities on a surface in front of the vehicle tire in response to said image processing,

wherein said control processes said image data to detect a curvature in the captured image of at least one of said line segment patterns of illumination to determine a surface irregularity.

2. The predictive suspension system of claim 1, wherein said predictive suspension system generates an output indicative of a detection of a surface irregularity, and wherein an active suspension system is responsive to said output.

3. The predictive suspension system of claim 1, wherein said control processes said image data to determine a height or depth of a detected surface irregularity via determining a degree of curvature of said at least one of said line segment patterns of illumination.

4. The predictive suspension system of claim 1, wherein said energy source is disposed at a forward portion of the vehicle and generally in line with the tire of the vehicle, said energy source projecting said at least one linear pattern of illumination downwardly and forwardly in a direction that is generally parallel with the direction of travel of the tire.

5. The predictive suspension system of claim 1, wherein said imaging sensor is disposed at a forward portion of the vehicle and directed generally downward so as to capture images of a road surface area in front of the vehicle tire.

6. The predictive suspension system of claim 1, wherein said imaging sensor is disposed at a forward portion of the vehicle and directed generally forwardly and downwardly so as to capture images of a road surface area in front of the vehicle.

7. The predictive suspension system of claim 1, wherein said imaging sensor is disposed at or near an interior rearview mirror assembly of the vehicle and has a forward field of view through the windshield of the vehicle that encompasses a road surface area in front of the vehicle.

8. The predictive suspension system of claim 1, wherein said predictive suspension system at least one of (a) shares components or circuitry with and (b) accesses components or circuitry of at least one of a headlamp control system, a lane departure warning system, an object detection system, and a rain sensor system.

9. The predictive suspension system of claim 1 further comprising at least one other imaging device operable to capture images of the surface in front of the vehicle at a location farther forward and along the vehicle path than the area encompassed by said imaging sensor, said control processing captured images of said imaging device to provide an alert of a detected surface irregularity.

10. The predictive suspension system of claim 9, wherein one of (a) said imaging sensor frame capture rate or timing and (b) said illumination by said energy source is adjustable in response to said alert.

11. A multi-stage predictive suspension system for a vehicle, said multi-stage predictive suspension system comprising:

a first imaging sensor disposed at a vehicle and having a field of view at least encompassing a first area forward of a tire of the vehicle;

a second imaging sensor disposed at the vehicle and having a field of view at least encompassing a second area forward of the tire of the vehicle, said second area being closer to the tire than said first area;

a control for processing image data captured by said first and second imaging sensors and detecting surface irregularities on a surface in front of the vehicle tire in response to said image processing, said control processing captured images of said first imaging sensor to provide an advance alert of a detected surface irregularity prior to detection of said detected surface irregularity by said second imaging sensor; and

an energy source operable to emit illumination in at least one cross-hair pattern at said second area so that said at least one pattern is projected onto at least a portion of said second area forward of the tire of the vehicle that is encompassed by said field of view of said second imaging sensor, said control processing said image data captured by said second imaging sensor to detect a curvature of said at least one linear pattern that is indicative of a surface irregularity.

12. The multi-stage predictive suspension system of claim 11, wherein one of (a) said second imaging sensor frame capture rate or timing is adjustable in response to said alert, (b) said illumination by said energy source is adjustable in response to said alert, and (c) an active suspension control is adjustable in response to said alert.