Walking assistance method and apparatuses performing the same

1. A walking assistance method, comprising:

detecting a landing time associated with a foot of a first leg of a user contacting a ground;

sensing a joint angle of a first hip joint of the user at the landing time as first hip joint angle information, the first hip joint being associated with the first leg of the user;

continually sensing the joint angle of the first hip joint of the user after the landing time as second hip joint angle information;

determining whether the second hip joint angle information satisfies a condition; and

initiating gait assistance in response to the second hip joint angle information satisfying the condition such that the gait assistance is delayed a duration of time after the landing time.

2. The walking assistance method of claim 1 , wherein

the first hip joint angle information and the second hip joint angle information include at least one of joint angle or joint angular velocity of the first hip joint.

3. The walking assistance method of claim 1 , wherein the initiating of the gait assistance comprises:

initiating output of an assist torque profile to assist a gait of the first leg of the user starting the duration of time after the landing time.

4. The walking assistance method of claim 3 , wherein the initiating of the output comprises:

initiating output of a first assist torque profile to assist a gait of the first leg of the user; and

initiating output of a second assist torque profile to assist a gait of a second leg of the user.

5. The walking assistance method of claim 4 , wherein an output duration of the first assist torque profile differs from an output duration of the second assist torque profile.

6. The walking assistance method of claim 1 , wherein the detecting of the landing time comprises:

detecting the landing time of the foot of the user based on acceleration information obtained from an acceleration sensor associated with a body of the user.

7. The walking assistance method of claim 3 , further comprising:

detecting whether the first leg of the user crosses a second leg of the user;

continually sensing a joint angle of the second leg of the user when the first leg and the second leg cross after the landing time;

determining whether the joint angle of the second leg of the user reaches a threshold angle after the first leg and the second leg cross; and

terminating the output of the assist torque profile in response to the joint angle of the second leg of the user reaching the threshold angle.

8. The walking assistance method of claim 3 , further comprising:

comparing a gait assistance duration set for a current step to a gait assistance proceeding time; and

terminating the output of the assist torque profile based on a result of the comparing.

9. The walking assistance method of claim 8 , wherein the gait assistance duration is updated for each step based on the gait assistance duration of a previous step.

10. The walking assistance method of claim 1 , wherein the second hip joint angle information satisfies the condition when the second hip joint angle is less than a weighted value of the first hip joint angle.

11. A walking assistance apparatus, comprising:

a sensor;

a driver configured to perform gait assistance of a user; and

a controller configured to control the driver by,

detecting a landing time associated with a foot of a first leg of the user contacting a ground,

sensing a joint angle of a first hip joint of the user at the landing time as first hip joint angle information, the first hip joint being associated with the first leg of the user,

continually sensing the joint angle of the first hip joint of the user after the landing time as second hip joint angle information,

determining whether the second hip joint angle information satisfies a condition, and

initiating the gait assistance in response to the second hip joint angle information satisfying the condition such that the gait assistance is delayed a duration of time after the landing time.

12. The walking assistance apparatus of claim 11 , wherein

the first hip joint angle information and the second hip joint angle information include at least one of joint angle or joint angular velocity of the first hip joint.

13. The apparatus of claim 11 , wherein the controller is further configured to initiate output of an assist torque profile to assist a gait of the first leg of the user starting the duration of time after the landing time.

14. The walking assistance apparatus of claim 13 , wherein the controller is further configured to,

initiate output of a first assist torque profile to assist a gait of the first leg of the user, and to

initiate output of a second assist torque profile to assist a gait of a second leg of the user.

15. The walking assistance apparatus of claim 14 , wherein an output duration of the first assist torque profile differs from an output duration of the second assist torque profile.

16. The walking assistance apparatus of claim 11 , further comprising

an acceleration sensor associated with a body of the user, wherein

the controller is further configured to detect the landing time based on acceleration information obtained from the acceleration sensor.

17. The walking assistance apparatus of claim 13 , wherein the controller is further configured to,

detect whether the first leg of the user crosses a second leg of the user,

continually sense a joint angle of the second leg of the user when the first leg and the second leg cross after the landing time,

determine whether the joint angle of the second leg of the user reaches a threshold angle after the first leg and the second leg cross, and

terminate the output of the assist torque profile in response to the joint angle of the second leg of the user reaching the threshold angle.

18. The walking assistance apparatus of claim 13 , wherein the controller is further configured to,

compare a gait assistance duration set for a current step to a gait assistance proceeding time, and

terminate the output of the assist torque profile based on a result of the comparing.

19. The walking assistance apparatus of claim 18 , wherein the gait assistance duration is updated for each step based on the gait assistance duration of a previous step.