公开(公告)号：US20220203521A1

公开(公告)日：2022-06-30

申请号：US17561609

申请日：2021-12-23

Applicant: UBTECH ROBOTICS CORP LTD

Inventor： Ligang Ge ,  Yizhang Liu ,  Chunyu Chen ,  Zheng Xie ,  Youjun Xiong

IPC: B25J9/16

Abstract: A control method for a robot includes: determining a desired zero moment point (ZMP) of the robot; obtaining a position of a left foot and a position of a right foot of the robot, and calculating desired support forces of the left foot and the right foot according to the desired ZMP, the positions of the left foot and the right foot; obtaining measured support forces of the left foot and the right foot, and calculating an amount of change in length of the left leg and an amount of change in length of the right leg according to the desired support forces of the left foot and the right foot, the measured support forces of the left foot and the right foot; and controlling the robot to walk according to the amount of change in length of the left leg and the right leg.

公开(公告)号：US11230001B2

公开(公告)日：2022-01-25

申请号：US16572637

申请日：2019-09-17

Applicant: UBTECH ROBOTICS CORP LTD

Inventor： Youjun Xiong ,  Ligang Ge ,  Yizhang Liu ,  Chunyu Chen ,  Zheng Xie ,  Jianxin Pang

IPC: B25J9/00 ,  B25J13/08 ,  B25J9/16 ,  B62D57/032

Abstract: There are a biped robot gait control method and a biped robot, where the method includes: obtaining six-dimensional force information, and determining a motion state of two legs of the biped robot; calculating a ZMP position of each of two legs of the biped robot; determining a ZMP expected value of each of the two legs in real time; obtaining a compensation angle of an ankle joint of each of the two legs of the biped robot by inputting the ZMP position, a change rate of the ZMP position, the ZMP expected value, and a change rate of the ZMP expected value to an ankle joint smoothing controller so as to perform a close-loop ZMP tracking control on each of the two legs; adjusting a current angle of the ankle joint of each of the two legs of the biped robot in real time; and repeating the forgoing steps.

公开(公告)号：US20210331753A1

公开(公告)日：2021-10-28

申请号：US16885227

申请日：2020-05-27

Applicant: UBTECH ROBOTICS CORP LTD

Inventor： JIE BAI ,  Ligang Ge ,  Hongge Wang ,  Yizhang Liu ,  Shuping Hu ,  Jianxin Pang ,  Youjun Xiong

IPC: B62D57/02 ,  B25J9/16 ,  B25J19/02 ,  G05D1/08 ,  G06F17/18

Abstract: The present disclosure provides a stair climbing gait planning method and an apparatus and a robot using the same. The method includes: obtaining first visual measurement data through a visual sensor of the robot; converting the first visual measurement data to second visual measurement data; and performing a staged gait planning on a process of the robot to climb the staircase based on the second visual measurement data. Through the method, the visual measurement data is used as a reference to perform the staged gait planning on the process of the robot to climb the staircase, which greatly improves the adaptability of the robot in the complex scene of stair climbing.

公开(公告)号：US20210181765A1

公开(公告)日：2021-06-17

申请号：US17114526

申请日：2020-12-08

Applicant: Ubtech Robotics Corp Ltd

Inventor： Jie Bai ,  Ligang Ge ,  Yizhang Liu ,  Hongge Wang ,  Jianxin Pang ,  Youjun Xiong

IPC: G05D1/08 ,  B62D57/02 ,  G05D1/02 ,  G05B19/4155

Abstract: A computer-implemented gait planning method includes: determining a pitch angle between a foot of the robot and a support surface where the robot stands; determining a support point on a sole of the foot according to the pitch angle; calculating an ankle-foot position vector according to the support point, wherein the ankle-foot position vector is a position vector from an ankle of the robot to a support point on a sole of the foot; calculating a magnitude of change of an ankle position according to the pitch angle and the ankle-foot position vector; and obtaining a compensated ankle position by compensating the ankle position according to the magnitude of change of the ankle position.

公开(公告)号：US20210178587A1

公开(公告)日：2021-06-17

申请号：US17120225

申请日：2020-12-13

Applicant: UBTECH ROBOTICS CORP LTD

Inventor： Chunyu Chen ,  Yizhang Liu ,  Ligang Ge ,  Zheng Xie ,  Hongge Wang ,  Youjun Xiong ,  Jianxin Pang

IPC: B25J9/16 ,  B25J13/08 ,  B62D57/032

Abstract: A robot control method includes: obtaining force information associated with a left foot and a right foot of the robot; calculating a zero moment point of a COM of a body of the robot based on the force information; updating a motion trajectory of the robot according to the zero moment point of the COM of the body to obtain an updated position of the COM of the body; performing inverse kinematics analysis on the updated position of the COM of the body to obtain joint angles of a left leg and a right leg of the robot; and controlling the robot to move according to the joint angles.

公开(公告)号：US20190196477A1

公开(公告)日：2019-06-27

申请号：US16231512

申请日：2018-12-23

Applicant: UBTECH Robotics Corp

Inventor： Youjun Xiong ,  Zheng Xie ,  Chunyu Chen ,  Yizhang Liu ,  Ligang Ge

IPC: G05D1/02

CPC classification number: G05D1/027 ,  G05D1/0272 ,  G05D2201/0217

Abstract: The present disclosure provides an equivalent trajectory generating method for a biped robot and a biped robot using the same. The method includes: obtaining a motion state of the biped robot by a position sensor; determining switching moments in an advancing direction of the biped robot, based on the motion state of the biped robot; finding the mass center position of the biped robot at each switching moment; connecting the mass center positions at the switching moments as an equivalent trajectory of the biped robot; and performing a closed loop control on the biped robot according to the equivalent trajectory. Through the method, the overall real-time position of the robot can be obtained according to the equivalent trajectory effectively, which is advantageous to perform a stable and reliable control to the biped robot according to the equivalent trajectory of the biped robot.

公开(公告)号：US12275152B2

公开(公告)日：2025-04-15

申请号：US18071462

申请日：2022-11-29

Applicant: UBTECH ROBOTICS CORP LTD

Inventor： Ligang Ge ,  Yizhang Lìu ,  Chunyu Chen ,  Qiuyue Luo ,  Jiangchen Zhou ,  Meng Yan ,  Youjun Xiong

IPC: G05B19/4155 ,  B25J9/16

Abstract: A robot stability control method includes: obtaining a desired zero moment point (ZMP) and a fed-back actual ZMP of a robot at a current moment; based on a ZMP tracking control model, the desired ZMP and the actual ZMP, calculating a desired value of a motion state of a center of mass of the robot at the current moment, wherein the desired value of the motion state of the center of mass comprises a correction amount of the position of the center of mass; based on a spring-mass-damping-acceleration model and the desired value of the motion state of the center of mass, calculating a lead control input amount for the correction amount of the position of the center of mass; and controlling motion of the robot according to the lead control input amount and a planned value of the position of the center of mass at the current moment.

公开(公告)号：US12257725B2

公开(公告)日：2025-03-25

申请号：US17976904

申请日：2022-10-31

Applicant: UBTECH ROBOTICS CORP LTD

Inventor： Chunyu Chen ,  Ligang Ge ,  Yizhang Liu ,  Jiangchen Zhou ,  Qiuyue Luo ,  Youjun Xiong

IPC: B25J9/16 ,  B25J13/08 ,  B62D57/032

Abstract: A jumping motion control method for a biped robot includes: before feet of the biped robot leaves a support surface, estimating a motion trajectory of the biped robot that leaves the support surface according to a period of time when the biped robot stays or flips in the air; calculating a first motion angle of each joint of legs of the biped robot according to the motion trajectory and inverse kinematics; determining a constraint condition according to a motion type to which an action to be performed by the biped robot corresponds; optimizing the first motion angles according to the constraint condition to obtain a second motion angle of each joint of legs of the biped robot; and controlling a jumping motion of the biped robot according to the second motion angles.

公开(公告)号：US12103187B2

公开(公告)日：2024-10-01

申请号：US17516729

申请日：2021-11-02

Applicant: UBTECH ROBOTICS CORP LTD

Inventor： Xingxing Ma ,  Chunyu Chen ,  Ligang Ge ,  Yizhang Liu ,  Hongge Wang ,  Jie Bai ,  Zheng Xie ,  Jiangchen Zhou ,  Meihui Zhang ,  Shuo Zhang ,  Youjun Xiong

IPC: B25J9/16 ,  B62D57/032 ,  G05D1/43 ,  G05D1/622 ,  G05D1/644 ,  G05D109/12

CPC classification number: B25J9/1666 ,  B62D57/032 ,  G05D1/43 ,  G05D1/637 ,  G05D1/644 ,  G05D2109/12

Abstract: A path planning method and a biped robot using the same are provided. The method includes: generating a candidate node set for a next foot placement based on a biped robot's own parameters and joint information of a current node, adding valid candidate nodes in the candidate node set to a priority queue so as to select optimal nodes for realizing next node expansion. These optimal nodes are output to generate a foot placement sequence from an initial node to a target node, which can greatly reduce the search amount for path nodes when the robot's legs intersect and touch the ground, thereby improving the efficiency of path planning.

公开(公告)号：US12097621B2

公开(公告)日：2024-09-24

申请号：US17726548

申请日：2022-04-22

Applicant: UBTECH ROBOTICS CORP LTD

Inventor： Jie Bai ,  Ligang Ge ,  Chunyu Chen ,  Yizhang Liu ,  Youjun Xiong

IPC: B25J9/16 ,  B62D57/032 ,  G06F11/10 ,  G06F17/10 ,  G06F30/17 ,  G06F30/20

CPC classification number: B25J9/1664

Abstract: A method for generating a center of mass (CoM) trajectory includes determining an actual pose of a center of mass (CoM), a pose of a left foot, and a pose of a right pose of a robot; determining a first pose tracking vector of the robot according to the actual pose of the CoM and the pose of the left foot, and determining a second pose tracking vector of the robot according to the actual pose of the CoM and the pose of the right foot; and controlling a desired pose of the CoM of the robot to alternately track the pose of the left foot and the pose of the right foot, according to the first pose tracking vector and the second pose tracking vector, so as to generate a desired CoM trajectory of the robot.