US5402050A
Expired / Lapsed
US
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Locomotion control system for mobile robot
Assignee: Honda Motor Co Ltd
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Filing: 1993-08-18
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Granted: 1995-03-28
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Expires: 2013-08-18
Abstract
Abstract A system for controlling locomotion of a biped robot discretely bringing its foot in contact with a floor in an environment such as that including stairs in which the robot's foot contact position is restricted. The robot's locomotion is controlled on the basis of predesigned gait parameters including its foot position/direction which determines foot landing position in a stair. A positional error is detected between the desired and actual foot landing positions in the stair. And, the gait parameters for the next stair is modified such that the foot landing position at the next stair is corrected in response to the detected error. With this arrangement, the error is not accumulated and does not exceed a premissible range which ensures the robot's stable walking. Thus, the robot's locomotion can be controlled in such a manner that the robot goes up and down the stairs consecutively.
Inventors
- 👤 Nobuaki Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:08
CPC Classifications
B; B62; B62D; B62D57/00; B62D57/02; B62D57/032
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
153 words
A system for controlling locomotion of a legged mobile robot having a plurality of legs and which can ascend or descend stairs, comprising: first means for determining a desired landing position at which a distal end of a robot leg is to be landed on a first step of the stairs relative to the edge of the first step; second means for detecting an actual landing position at which the distal end of the leg landed on the first step of the stairs third means for determining an error between the desired landing position and the actual landing position on the first step and for comparing the error with a predetermined value; and fourth means for determining a corrected desired landing position at which another robot leg is to be landed on a second step of the stairs, in response to the error if the error is found to exceed the predetermined value.
Claim 2
Independent Claim
153 words
A system for controlling locomotion of a legged mobile robot having a plurality of legs and which can ascend or descend stairs, comprising: first means for determining a desired landing position at which a distal end of a robot leg is to be landed on a first step of the stairs relative to the edge of the first step; second means for detecting an actual landing position at which the distal end of the leg landed on the first step of the stairs third means for determining an error between the desired landing position and the actual landing position on the first step and for comparing the error with a predetermined value; and fourth means for determining a corrected desired landing position at which another robot leg is to be landed on a second step of the stairs, in response to the error if the error is found to exceed the predetermined value.
Claim 3
Dependent Claim
48 words
A system according to claim 1, wherein said fourth means corrects the desired landing position on the second step after a distal end of the another robot leg is lifted from a third step of the stairs adjacent to the first step and opposite from the second step.
Claim 4
Dependent Claim
25 words
A system according to claim 1, wherein the legged mobile robot is a biped robot and the distal end is a foot of the robot.
Claim 5
Dependent Claim
25 words
A system according to claim 2, wherein the legged mobile robot is a biped robot and the distal end is a foot of the robot.
Claim 6
Dependent Claim
28 words
A system according to claim 1, wherein said fourth means corrects the desired landing position on the second step in position and direction in response to the error.
Claim 7
Dependent Claim
28 words
A system according to claim 2 wherein said fourth means corrects the desired landing positons on the second step in position and direction in response to the error.
Claim 8
Dependent Claim
28 words
A system according to claim 1, wherein said fourth means corrects the desired landing position in response to a valve obtained by multiplying a gain by the error.
Claim 9
Dependent Claim
14 words
A system according to claim 7, wherein the gain is no more than 1.
Claim 10
Dependent Claim
29 words
A system according to claim 8, wherein the gain is a value between 0.5 to 0.75 when the first step, second step, and third step are constant in length.
Claim 11
Dependent Claim
28 words
A system according to claim 2, wherein siad fourth means corrects the desired landing position in response to a value obtained by multiplying a gain by the error.
Claim 12
Dependent Claim
14 words
A system according to claim 10, wherein the gain is no more than 1.
Claim 13
Dependent Claim
29 words
A system according to claim 11, wherein the gain is a value between 0.5 to 0.75 when the first step, second step, and third step are constant in length.
Claim 14
Independent Claim
173 words
A system for controlling locomotion of a legged mobile robot having a plurality of legs which can ascend or descend stairs, comprising: first means for determining a desired landing position at which a distal end of a robot leg lands on a first step of the stairs; second means for detecting an actual tanding position at which the distal end of the leg lands on the first step of the stairs; third means for determining a first error between the desired landing position and the actual landing position at the first step and adding it to a second error between a desired landing position and an actual landing position at a second step adjacent to the first step and comparing the combined errors with a predetermined value; and fourth means for correcting a desired landing position at which another robot leg lands on a third step adjacent to the first step and opposite the second step in response to the added error, if the added error is found to exceed the predetermined value.
Claim 15
Independent Claim
173 words
A system for controlling locomotion of a legged mobile robot having a plurality of legs which can ascend or descend stairs, comprising: first means for determining a desired landing position at which a distal end of a robot leg lands on a first step of the stairs; second means for detecting an actual tanding position at which the distal end of the leg lands on the first step of the stairs; third means for determining a first error between the desired landing position and the actual landing position at the first step and adding it to a second error between a desired landing position and an actual landing position at a second step adjacent to the first step and comparing the combined errors with a predetermined value; and fourth means for correcting a desired landing position at which another robot leg lands on a third step adjacent to the first step and opposite the second step in response to the added error, if the added error is found to exceed the predetermined value.
Claim 16
Dependent Claim
36 words
A system according to claim 13, wherein said fourth means corrects the desired landing position on the third step after an distal end of the another leg is lifted from the second step of the stairs.
Claim 17
Dependent Claim
25 words
A system according to claim 14, wherein the legged mobile robot is a biped robot and the distal end is a foot of the robot.
Claim 18
Dependent Claim
29 words
A system according to claim 14, wherein said fourth means corrects the desired landing positons on the third step in position and direction in response to the added error.
Claim 19
Dependent Claim
25 words
A system according to claim 13, wherein the legged mobile robot is a bipbed robot and the distal end is a foot of the robot.
Claim 20
Dependent Claim
60 words
A system according to claim 2, wherein said fourth means corrects the desired landing po9sition; said object is a stair; said first means detects a relative relationship at a n-th stair between the robot foot and the stair; and said second means determines a desired value on the third step in position and direction in response to the combined error.
Claim 21
Dependent Claim
29 words
A system according to claim 13, wherein said foruth means corrects the desired landing position in response to a value obtained by multiplying a gain to the added error.
Claim 22
Dependent Claim
14 words
A system according to claim 19, wherein the gain is no more than 1.
Claim 23
Dependent Claim
29 words
A system according to claim 20, wherein the gain is a value between 0.5 and 0.75 when the first step, second step, and third step are constant in length.
References Cited (Backward Citations)
JPS6297006A
Cited
JPS63150176A
Cited
US4834200A
Cited
US5151859A
Cited
JPH03184782A
Cited
US5159988A
Cited
US5255753A
Cited
JPH04201187A
Cited
US5206569A
Cited
US5221883A
Cited
US5252901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |