BIOLOGICALLY INSPIRED COMPLIANT LOCOMOTION FOR REMOTE VEHICLES

• US 20110301785A1
• Filed: 03/07/2011
• Published: 12/08/2011
• Est. Priority Date: 03/05/2010
• Status: Abandoned Application

• Current Assignee: iRobot Corporation
• Original Assignee: iRobot Corporation
• Inventors: Sword, Lee F.
• Application Number:
  US13/042,409
• Publication Number:
  US 20110301785A1
• Time in Patent Office: Days
• US Class Current: 701/2
• CPC Class Codes: B62D 55/075 Tracked vehicles for ascending or descending stairs, steep slopes or vertical surfacesmagnetic or pneumatic ground-engaging parts B62D55/265; chairs or multi-track cycles specially adapted for invalids A61G5/00
• CPC Class Codes: B62D 55/116 Attitude or position control of chassis by action on suspension, e.g. to compensate for a slope
• CPC Class Codes: B62D 55/242 The flexible band being semi-rigid for resisting back-flexing and contributing to spring the vehicle
• CPC Class Codes: B62D 55/247 Gas filled or inflatable flexible tracks connection of valves to inflatable elastic bodies B60C29/00
• CPC Class Codes: B62D 55/27 having different types of crampons for progression over varying ground
• CPC Class Codes: G01S 17/931 of land vehicles

Abstract

A method for providing a uniform ground contact pressure when operating a tracked remote vehicle comprises: sensing the terrain below the remote vehicle using a series of proximity sensors that are configured to measure a distance from an underside of a chassis of the remote vehicle to the terrain directly beside a track of the remote vehicle; monitoring, mapping, and classifying an upcoming terrain; and adapting the remote vehicle'"'"'s track profile, flipper position, arm position, and center of balance based on the upcoming terrain.

Claims

1. A tracked remote vehicle configured to provide a uniform ground contact pressure when operating, the tracked remote vehicle comprising:

an active suspension system including one or more of active sensing with both reactive and predictive responses to the terrain, active bogie wheels, a center-of-gravity shifting payload or device, and independent autonomous flipper control.

2. The tracked remote vehicle of claim 1, wherein the active suspension system comprises one or more sensors on the remote vehicle developing knowledge of the surrounding terrain using sensor and software technologies.

3. The tracked remote vehicle of claim 2, wherein the one or more sensors comprise one or more of monocular cameras, a stereo vision camera, Flash LIDAR, laser scanning, and ultra wide band (UWB) radar.

4. The tracked remote vehicle of claim 1, wherein the active suspension system comprises downward-facing 3D sensors including one or more of a laser scanner, a bogie wheel-based pressure sensor, and a proximity sensor configured to monitor terrain under the remote vehicle.

5. The tracked remote vehicle of claim 4, wherein the proximity sensor is configured to measure a distance from an underside of a chassis of the remote vehicle to the terrain directly beside a track of the remote vehicle, allowing the remote vehicle to reactively adapt its track profile to changing terrain.

6. The tracked remote vehicle of claim 1, wherein the active suspension system comprises active bogie wheels including individual actuators on each bogie wheel that press the bogie wheel against the remote vehicle track, thereby changing a track profile beneath the remote vehicle.

7. The tracked remote vehicle of claim 6, further comprising a captive track guide allowing the bogie wheels to pull the track away from the terrain to create an optimal track profile.

8. A tracked remote vehicle configured to provide a uniform ground contact pressure when operating, the tracked remote vehicle comprising:

a passive suspension system to enhance track contact over uneven ground and including one or more of a suspended bogie wheels, a compliant bogie strip, jamming tracks, open track cells, and flap-cleated tracks.

9. The tracked remote vehicle of claim 8, wherein the passive suspension system comprises suspended bogie wheels, and a sideplate and battery ports of the remote vehicle are relocated, and compliance is added to a rear idler wheel to maintain required track tension while allowing for terrain contouring for the suspended bogie wheels, which are suspended by mechanical linkages with spring dampers to provide maximum travel and shock absorption.

10. The tracked remote vehicle of claim 8, wherein the passive suspension system comprises a compliant bogie strip that is implemented without mechanical linkages, and is mounted on a compliant one-piece bogie strip engaging a bottom portion of the track.

11. The tracked remote vehicle of claim 10, wherein bogie wheels are mounted to the compliant bogie trip via mounting arms that determine compliance of the bogie strip.

12. The tracked remote vehicle of claim 8, wherein the passive suspension system comprises jamming tracks, each jamming track comprising compartments containing a jamming material.

13. The tracked remote vehicle of claim 12, wherein the material comprising the compartments is elastic or flexible, having a strength sufficient to carry the remote vehicle across a variety of terrains.

14. The tracked remote vehicle of claim 8, wherein the passive suspension system comprises open track cells having a dual-layer track including an inner track layer providing required track tension, an outer track layer providing an interface with the ground, and a series of cells being defined by a webbing or walls attaching the inner track layer to the outer track layer.

15. The tracked remote vehicle of claim 8, wherein the passive suspension system comprises flap-cleated tracks including flap-type cleats that increase a surface area of the remote vehicle tracks.

16. The tracked remote vehicle of claim 15, wherein the increased surface area afforded by the flap-type cleat can be combined with cleats extending outwardly from the flap-type cleats.

17. The tracked remote vehicle of claim 15, wherein the flap-type cleats comprise a material having a stiffness that provides suitable conformability, weight distribution, and durability.

18. A method for providing a uniform ground contact pressure when operating a tracked remote vehicle, the method comprising:

sensing the terrain below the remote vehicle using a series of proximity sensors that are configured to measure a distance from an underside of a chassis of the remote vehicle to the terrain directly beside a track of the remote vehicle;

monitoring, mapping, and classifying an upcoming terrain; and

adapting the remote vehicle'"'"'s track profile, flipper position, arm position, and center of balance based on the upcoming terrain.

19. The method of claim 18, wherein monitoring, mapping, and classifying the surrounding terrain can be accomplished by downward-angled 3D sensors such as laser scanners or Flash LIDAR.

20. The method of claim 18, further comprising combining information regarding the sensed terrain below the remote vehicle with information regarding the upcoming terrain to improve accuracy of the vehicle adapted track profile.