公开(公告)号：US20230198374A1

公开(公告)日：2023-06-22

申请号：US17910683

申请日：2021-04-16

Applicant: Beijing Institute of Technology

Inventor： Junjun Deng ,  Zhenpo Wang ,  Na Fu ,  Shuo Wang

IPC: H02M1/08 ,  H02J50/12 ,  H02M1/00 ,  H02M3/335

CPC classification number: H02M1/083 ,  H02J50/12 ,  H02M1/0058 ,  H02M3/33573 ,  H02J2207/20

Abstract: A wireless power transfer (WPT) system regulation method and system for implementing zero voltage switching (ZVS) in a wide power range are provided. The method includes: determining, according to a topology structure of a WPT system and based on a linear state equation, a phase-shift angle boundary and a switching frequency boundary of an inverter that meet ZVS; fixing a switching frequency at a resonance frequency of the WPT system, and determining, in a phase-shift manner, a phase-shift range and a corresponding first voltage output range for implementing ZVS; determining a frequency variation range of a frequency modulation method; determining an optimal switching frequency based on corresponding switching frequencies and phase-shift angles that meet ZVS at different expected output voltages of the WPT system; determining a second voltage output range for implementing ZVS at the optimal switching frequency; and regulating the WPT system by using different regulation methods.

公开(公告)号：US20230194724A1

公开(公告)日：2023-06-22

申请号：US17739264

申请日：2022-05-09

Applicant: Beijing Institute of Technology

Inventor： Qun HAO ,  Jie CAO ,  Jingjing LI ,  Kun LI ,  Jiaqi GUO ,  Kaili ZHANG

IPC: G01S17/894 ,  G02B26/08 ,  H01L31/107 ,  G01S7/481 ,  G01S7/484 ,  G01S7/4863

CPC classification number: G01S17/894 ,  G01S7/484 ,  G01S7/4817 ,  G01S7/4863 ,  G02B26/0833 ,  H01L31/107

Abstract: A high-dynamic-range hybrid solid-state lidar system, which is based on a transponder array module, includes a transmitting system, a transceiver integrated optical system, a one-dimensional scanning device, a detecting system, and an information processing system. An information processing control circuit and a gain control module increase a total amplification factor, in a single timing period, of a gain circuit over time, thereby alleviating an echo signal intensity distortion, and expanding a dynamic ranging range. The system uses the one-dimensional scanning device and the transceiver integrated optical system composed of a circulator, a lens set, and an optical fiber array, so that the optical system is separated from an avalanche photo diode (APD) detector, and focusing is not required. A temperature of a linear APD array is monitored in the detecting system to adjust a reverse bias voltage of an APD correspondingly and alleviate unstable gain caused by a temperature change.

公开(公告)号：US11680858B2

公开(公告)日：2023-06-20

申请号：US17377200

申请日：2021-07-15

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Chunguang Xu ,  Shuangyi Li ,  Yuren Lu ,  Peng Yin ,  Dezhi Li ,  Wenyuan Song

IPC: G01L1/25 ,  G01N29/07 ,  G01N29/27 ,  G01N29/04 ,  G01N29/28

CPC classification number: G01L1/255 ,  G01N29/043 ,  G01N29/07 ,  G01N29/27 ,  G01N29/28 ,  G01N2291/101

Abstract: A device and a method for ultrasonic detecting a rotating member based on magnetic fluid coupling, wherein the device comprises an ultrasonic probe, magnetic field protection rings, magnetic fluid and a magnetic fluid protection cover. The ultrasonic probe is arranged above the rotating member that is horizontally placed. Front ends of a transmitting ultrasonic transducer and a receiving ultrasonic transducer of the ultrasonic probe are provided with the magnetic field protection rings for generating magnetic fields in the magnetic field protection rings. The protective cover is sleeved on a circumferential outer side of the rotating member where a detected position is located, and the front ends of the ultrasonic probe are arranged to penetrate through the magnetic fluid protective cover. A cavity formed between the magnetic fluid protective cover and the rotating member is filled with the magnetic fluid and the magnetic fluid is a liquid mixture solution.

公开(公告)号：US11662271B1

公开(公告)日：2023-05-30

申请号：US17971051

申请日：2022-10-21

Applicant: Beijing Institute of Technology

Inventor： Mingming Dong ,  Yitong Wang ,  Yue Bian ,  Shen Lu ,  Xiang Ji

IPC: G01M17/007

CPC classification number: G01M17/007

Abstract: The road simulation device includes a frame structure and a transmission structure. The transmission structure includes a first test bench, a second test bench, a third test bench and a fourth test bench. A first sliding plate structure of the first test bench slides in a first direction and a second direction, a second sliding plate structure of the second test bench slides in the first direction, and a third sliding plate structure of the third test bench slides in the second direction. The first sliding plate structure and the first base structure, the second sliding plate structure and the second base structure, the third sliding plate structure and the third base structure, as well as the fourth baffle plate structure and the fourth base structure are connected by spherical hinges. Damages to the frame structure caused by huge acting force generated by rigid connection during testing can be avoided.

公开(公告)号：US20230132498A1

公开(公告)日：2023-05-04

申请号：US17978242

申请日：2022-11-01

Applicant: Beijing Institute of Technology

Inventor： Junsheng WANG ,  Xinghai YANG ,  Guangyuan TIAN ,  Chengpeng XUE ,  Shuo WANG ,  Yuxuan ZHANG

IPC: C22C21/16 ,  C22C1/02 ,  C22F1/057

Abstract: An aluminum-lithium alloy with low density, high strength, and high elastic modulus and its production method are provided. A chemical composition of the aluminum-lithium alloy with low density, high strength, and high elastic modulus by weight is: Cu 1.5-4.5 wt %, Li 2.4-3.8 wt %, Mg 0.5-2.0 wt %, Zn 0.5-1.0 wt %, Ag 0.3-0.8 wt %, Er 0.05-0.3 wt %, Zr 0.05-0.25 wt %, Fe≤0.08 wt %, Si≤0.05 wt %, and the balance is Al and inevitable impurities. The production method includes: preparing raw materials, drying, adjusting pressure of an electromagnetic-induction furnace, melting in a vacuum induction furnace, power adjustment, casting, heat treatment, cooling. Degassing and slag removals are avoided, and defects of aluminum-lithium alloy during production are reduced.

公开(公告)号：US11639882B2

公开(公告)日：2023-05-02

申请号：US17178569

申请日：2021-02-18

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Lijun Hao ,  Zihao Ge ,  Hang Yin ,  Junfang Wang ,  Xiaohu Wang ,  Jia Liu ,  Jin Liu ,  Yunjing Wang

IPC: G01M15/10

Abstract: The present disclosure provides a method and system for detecting exhaust emissions of a vehicle equipped with an ignition engine based on big data of remote sensing. The system includes: a vehicle emission measuring instrument, a host computer, an information display instrument, a vehicle driving state tester, a weather monitor, a license plate camera and a vehicle emission monitoring platform. The vehicle emission measuring instrument, the information display instrument, the vehicle driving state tester, the weather monitor and the license plate camera communicate with the host computer. The host computer is connected to the vehicle emission monitoring platform via the Internet. The present disclosure acquires pollutant concentrations in the vehicle emissions through the detection system, divides a vehicle specific power (VSP) into multiple bins, performs statistical analysis and evaluation on the vehicle emissions according to different vehicle types, and determines high-emission vehicles.

公开(公告)号：US11633319B2

公开(公告)日：2023-04-25

申请号：US16428091

申请日：2019-05-31

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Qiang Huang ,  Liancun Zhang ,  Fei Meng ,  Weimin Zhang ,  Zhiheng Wang

IPC: A61H3/00 ,  A61H1/02

Abstract: The present disclosure discloses an unpowered wearable walking assistance knee equipment with gait self-adaptivity comprising a left foot power output assembly, a right foot power output assembly, a left leg knee joint assistance execution assembly, a right leg knee joint assistance execution assembly and a driving force transmission device. The equipment of the present disclosure is based on lever principle and crank block structure principle and adopts an operation mode of combining ipsilateral parallel driving input and different sides cross driving input. The self-weight of the human body is utilized as a driving force during the walking process to enable the left foot power output assembly to provide the left leg knee joint assistance execution assembly with a pulling force for its stretching and to provide the right leg knee joint assistance execution assembly with a pulling force for its bending, and to enable the right foot power output assembly to provide the right leg knee joint assistance execution assembly with a pulling force for its stretching and to provide the left leg knee joint assistance execution assembly with a pulling force for its bending, so that a torque for assisting the stretching and bending of the left leg knee joint and the right leg knee joint is generated according to a gait cycle regularity during the walking process, and the goal of walking assistance is achieved.

公开(公告)号：US11630029B2

公开(公告)日：2023-04-18

申请号：US17863726

申请日：2022-07-13

Applicant: Beijing Institute of Technology ,  TSINGHUA UNIVERSITY

Inventor： Xu He ,  Xiao Ma ,  Jianxin Wang ,  Fushui Liu

IPC: G01M15/02

Abstract: Disclosed in embodiments of the present invention are a synchronous control method and system for a laser test of an optical engine. The operation of a laser can be driven by the synchronous control system. When a test of a data point is finished and the optical engine stops for optical window cleaning, the laser may still maintain stable operation under the driving of the synchronous control system, experiments may be directly carried out next time, and thus, laser test efficiency of the optical engine can be improved. Moreover, the synchronous control system is adopted to independently drive the laser to achieve energy stability before experiments, preventing an influence of long-term operation on the performance of the optical engine, and improving test accuracy.

公开(公告)号：US11618519B2

公开(公告)日：2023-04-04

申请号：US16885527

申请日：2020-05-28

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Qiang Huang ,  Zhangguo Yu ,  Xuechao Chen ,  Chencheng Dong ,  Qingqing Li ,  Libo Meng ,  Gao Huang

IPC: B62D57/02 ,  B25J9/16 ,  B25J13/08 ,  G05D15/01

Abstract: The present invention discloses a method of tracking control for a foot force and moment of a biped robot. According to the method, a double-spring damping model is designed, and a force tracking controller is designed by using an LQR optimization method, so as to realize tracking of the foot force and moment of the biped robot. Further, a desired force on a foot and a desired moment on the foot are calculated through a planned ZMP distribution method, thereby eventually achieving better ZMP tracking of the biped robot and adapting to ground of certain unevenness. According to the present invention, the traditional control method of ZMP tracking to realize stable walking of a biped robot and adapting to uneven ground is abandoned; instead, a desired force and moment on a foot enabling stable walking of the robot are directly calculated, and direct control is performed to realize tracking of the force and moment on the foot, so as to carry out stable control in a more essential and easy-to-implement manner, thereby achieving faster control response, stronger capability of adapting to uneven ground, and ideal ZMP tracking effect.

公开(公告)号：US11614719B2

公开(公告)日：2023-03-28

申请号：US16742542

申请日：2020-01-14

Applicant: Beijing Institute of Technology

Inventor： Qiang Huang ,  Xiaopeng Chen ,  Yang Xu ,  Zhangguo Yu ,  Xuechao Chen ,  Weimin Zhang

IPC: B25J9/16 ,  H04N5/232 ,  G05B19/4155 ,  G05B13/04 ,  B25J17/02 ,  H04N23/695 ,  H04N23/68

Abstract: The present application discloses a wide-field-of-view anti-shake high-dynamic bionic eye. A trajectory tracking method based on a bionic eye robot includes: establishing a linear model according to a bionic eye robot; establishing a full state feedback control system on the basis of the linear model; in the full state feedback control system, acquiring an angle and an angular acceleration required for a joint in a target tracking process of the bionic eye on the basis of a preset trajectory expectation value and a preset joint angle expectation value; the method further includes: adopting a linear quadratic regulator (LQR) to calculate a parameter K in the full state feedback control system, and minimizing energy consumption by establishing an energy function, so as to optimize the coordinated head-eye motion control of the linear bionic eye. The present application achieves the optimal control of the target tracking.