Motion controlling apparatus and method and remote controlling apparatus and method for legged mobile robot

• US 20040205417A1
• Filed: 10/10/2003
• Published: 10/14/2004
• Est. Priority Date: 10/11/2002
• Status: Active Grant

• Current Assignee: Jinichi Yamaguchi, Sony Corporation (Sony Group Corp.)
• Original Assignee: Jinichi Yamaguchi, Sony Corporation (Sony Group Corp.)
• Inventors: Yamaguchi, Jinichi, Moridaira, Tomohisa
• Granted Patent: US 7,236,852 B2
• Time in Patent Office: Days
• US Class Current: 714/48
• CPC Class Codes: B62D 57/032 with alternately or sequentially lifted supporting base and legs; with alternately or sequentially lifted feet or skid B62D57/024 takes precedence

Abstract

A legged mobile robot itself is responsive to the result of error detection during robot operations to perform error avoiding processing autonomously. In detecting an error, requested commands are all blocked by the internal processing within the robot so that an input to an actuating system does not affect the robot. The type of the error that has occurred is also notified to the actuating system so that feedback to an inputting system 32 may be applied in a manner specific to the error type. When the error is eliminated, that effect is notified to the actuating system to enable re-initiation of the usual command input from the remote operating system.

Claims

1. A motion controlling apparatus for a legged mobile robot having at least a plurality of movable legs, said apparatus comprising:

command receiving means for receiving a command for actuating a robot body, entered from an operating system;

motion realization means for executing a motion of the robot body specified by said command for actuating the robot body;

sensor means for detecting an inner state of said robot body to output the sensor information;

error detection means for detecting an error occurring on said robot body and/or elimination of said error based on said sensor information; and

gate means for stopping the processing of said command for actuating the robot body by said motion realization means, responsive to said error detection, and/or re-initiating the processing of said command for actuating the robot body responsive to said error elimination.

2. The motion controlling apparatus for a legged mobile robot according to claim 1, wherein said command receiving means has mounted thereto a communication protocol, exemplified by TCP/IP, and effects wired or wireless data communication with an external remote operating device.

3. The motion controlling apparatus for a legged mobile robot according to claim 1, wherein said motion realization means includes

a number of resource management posture transition control modules for said robot for distributing the processing in terms of a resource, exemplified by a body trunk and a waist, as a unit, responsive to the command for actuating the robot body;

an agent for scheduling a motion for each resource to make a request for locomotion generation or motion reproduction in keeping with contents; and

locomotion generating or motion reproducing means for generating a walking type in real-time responsive to said request from said agent or changing a command value of an angle of each joint responsive to the motion requested by said agent.

4. The motion controlling apparatus for a legged mobile robot according to claim 3, wherein, as regards the posture transition, each resource management posture transition control module for said robot determines the consistency between the posture specified by the command for robot body actuation and the current posture and causes transition from a posture inconsistent with the command to a posture consistent with the command.

5. The motion controlling apparatus for a legged mobile robot according to claim 1, further comprising:

error elimination means for executing an error eliminating operation responsive to the result of error detection by said error detection means.

6. The motion controlling apparatus for a legged mobile robot according to claim 1, wherein an error is detected in the falling priority sequence of an operation in the torque limiter, overcurrent detection, clinching, falldown and stability discrimination.

7. The motion controlling apparatus for a legged mobile robot according to claim 5, wherein said error elimination means is responsive to error detection in the torque limiter in a joint actuator to lower the gain of each joint actuator where the torque limiter is operating to change the command value of the angle of each joint to a measured value to lower the torque.

8. The motion controlling apparatus for a legged mobile robot according to claim 5, wherein said error elimination means is responsive to detection of an overcurrent in the joint actuator to lower the gain of the joint actuator where the overcurrent has occurred to change the command value of the angle of each joint to a measured value to lower the torque.

9. The motion controlling apparatus for a legged mobile robot according to claim 5, wherein said error elimination means is responsive to detection of clinching in the joint to lower the gain of the joint actuator as a site of the clinching.

10. The motion controlling apparatus for a legged mobile robot according to claim 5, wherein said error elimination means is responsive to detection of falldown of said robot body to lower the gain of each joint actuator to cause the robot to assume an impact-accommodating passive posture matched to the falldown direction.

11. The motion controlling apparatus for a legged mobile robot according to claim 5, wherein said error elimination means is responsive to detection of loss of stability of said robot body to instruct said motion realization means to perform a motion of bracing legs to avoid falldown to raise the position of the center of gravity of said robot body.

12. The motion controlling apparatus for a legged mobile robot according to claim 1, further comprising:

a restoration manager which, when the robot has assumed an unknown posture, causes the robot to revert to a known posture closest to the unknown posture, responsive to error detection, to cause the robot to be restored to a predetermined posture transition model.

13. A motion controlling method for a legged mobile robot having at least a plurality of movable legs, said method comprising:

a command receiving step of receiving a command for actuating a robot body, entered from an operating system;

a motion realization step of executing a motion of the robot body specified by said command for actuating the robot body;

a sensing step of detecting an inner state of said robot body to output the sensor information;

an error detection step of detecting an error occurring on said robot body and/or elimination of said error based on said sensor information; and

a gating step of stopping the processing of said command for actuating the robot body by said motion realization step, responsive to said error detection, and/or re-initiating the processing of said command for actuating the robot body responsive to said error elimination.

14. The motion controlling method for a legged mobile robot according to claim 13, wherein in said command receiving step, there is mounted a communication protocol, exemplified by TCP/IP, and effects wired or wireless data communication with an external remote operating device.

15. The motion controlling method for a legged mobile robot according to claim 13, wherein said motion realization step is executed by booting a program module comprising

a number of resource management posture transition control modules for said robot for distributing the processing in terms of a resource, exemplified by a body trunk and a waist, as a unit, responsive to the command for actuating the robot body;

an agent for scheduling a motion for each resource to make a request for locomotion generation or motion reproduction in keeping with contents; and

locomotion generating or motion reproducing modular for generating a walking type in real-time responsive to said request from said agent or changing the command value of an angle of each joint responsive to the motion requested by said agent.

16. The motion controlling method for a legged mobile robot according to claim 13, wherein, as regards the posture transition, each resource management posture transition control module of said robot determines the consistency between the posture specified by the command for robot body actuation and the current posture and causes transition from a posture inconsistent with the command to a posture consistent with the command.

17. The motion controlling method for a legged mobile robot according to claim 13, further comprising:

an error elimination step of executing an error eliminating operation responsive to the result of error detection by said error detection step.

18. The motion controlling method for a legged mobile robot according to claim 13, wherein, in the error detection step, an error is detected in the falling priority sequence of an operation in the torque limiter, overcurrent detection, clinching, falldown and stability discrimination.

19. The motion controlling method for a legged mobile robot according to claim 18, wherein said error elimination step is responsive to error detection in the torque limiter in a joint actuator to lower the gain of each joint actuator where the torque limiter is operating to change the command value of the angle of each joint to a measured value to lower the torque.

20. The motion controlling method for a legged mobile robot according to claim 18, wherein said error elimination step is responsive to detection of an overcurrent in the joint actuator to lower the gain of each joint actuator where the overcurrent has occurred to change the command value of the angle of each joint to a measured value to lower the torque.

21. The motion controlling method for a legged mobile robot according to claim 18, wherein said error elimination step is responsive to detection of clinching in the joint to lower the gain of the joint actuator as a site of the clinching.

22. The motion controlling method for a legged mobile robot according to claim 18, wherein said error elimination step is responsive to detection of falldown of said robot body to lower the gain of each joint actuator to cause the robot to assume an impact-accommodating passive posture matched to the falldown direction.

23. The motion controlling method for a legged mobile robot according to claim 18, wherein said error elimination step is responsive to detection of loss of stability of said robot body to instruct said motion realization step to perform a motion of bracing legs to avoid falldown of the robot body to raise the position of the center of gravity.

24. The motion controlling method for a legged mobile robot according to claim 13, further comprising:

a restoration step of restoring the robot to a known posture closest to the unknown posture, responsive to error detection, when the robot has assumed an unknown posture, to restore the robot to a predetermined posture transition model.

25. A remote operating apparatus for a legged mobile robot having at least a plural number of mobile legs, said apparatus comprising:

inputting means for accepting the inputting of a command for actuating the legged mobile robot from a user;

command processing means for converting the command via said inputting means for actuating the legged mobile robot to a command for actuating a robot body to transmit the resulting command for actuating the robot body to said legged mobile robot; and

feedback means for receiving an error detection result from said legged mobile robot to feed back the so received error detection result to said inputting means.

26. The remote operating apparatus for a legged mobile robot according to claim 25, wherein said feedback means is responsive to receipt of the error detection result from said legged mobile robot to impose limitations on the inputting from said inputting means.

27. The remote operating apparatus for a legged mobile robot according to claim 26, wherein said feedback means is responsive to notification of the fact of error elimination from said legged mobile robot to eliminate the limitations on the inputting from said inputting means.

28. The remote operating apparatus for a legged mobile robot according to claim 25, wherein, if the type of the detected error notified from said legged mobile robot is the falldown of said robot body, said feedback means imposes an impact on said inputting means.

29. A remote operating method for a legged mobile robot having at least a plural number of mobile legs, said method comprising:

an inputting step of accepting the inputting of a command for actuating the legged mobile robot from a user;

a command processing step of converting the command via said inputting step for actuating the legged mobile robot to a command for actuating a robot body to transmit the resulting command for actuating the robot body to said legged mobile robot; and

a feedback step of receiving an error detection result from said legged mobile robot to feed back the so received error detection result to said inputting step.

30. The remote operating method for a legged mobile robot according to claim 29, wherein said feedback step is responsive to receipt of the error detection result from said legged mobile robot to impose limitations on the inputting from said inputting step.

31. The remote operating method for a legged mobile robot according to claim 29, wherein said feedback step is responsive to notification of the fact of error elimination from said legged mobile robot to eliminate the limitations on the inputting from said inputting step.

32. The remote operating method for a legged mobile robot according to claim 29, wherein, if the type of the detected error notified from said legged mobile robot is the falldown of said robot body, said feedback step imposes an impact on said inputting step.