公开(公告)号：US20210088795A1

公开(公告)日：2021-03-25

申请号：US17065788

申请日：2020-10-08

Applicant: Arizona Board of Regents on behalf of the University of Arizona ,  BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Dewen Cheng ,  Yongtian Wang ,  Hong Hua

IPC: G02B27/01 ,  G02B5/04

Abstract: A tiled head-mounted display device, comprising: an optical component including a plurality of prisms with free-form surfaces, each prism being a wedge prism comprising a first optical surface, a second optical surface and a third optical surface; and a display component including a plurality of micro-displays, wherein the number of the micro-displays and the number of the prisms with free-form surfaces is identical. The tiled head-mounted display device according to the present invention is compact and light, provides wide field of view and high resolution, especially for the optical tiling head-mounted display device, the exit pupil planes of each display channels are coincident, thus avoiding pupil aberration and keeping exit pupil diameter and eye clearance same as the single ocular. There is no resolution variance throughout the entire field of view, thus preventing extra trapezoid distortion. The tiled head-mounted display device according to the present invention can be readily applicable to augmented environments applications by simply adding an auxiliary free-form lens behind the free-form prism.

公开(公告)号：US10940849B1

公开(公告)日：2021-03-09

申请号：US16896461

申请日：2020-06-09

Applicant: Beijing Institute of Technology ,  Baotou Sansi Technology Development Co., Ltd.

Inventor： Weida Wang ,  Changle Xiang ,  Lijin Han ,  Hui Liu ,  Donghao Zhang ,  Chao Yang ,  Shaoping Lv

IPC: B60W10/08 ,  H02J7/00

Abstract: The present invention discloses a real-time optimization control method for an electro-mechanical transmission system, and relates to the field of electro-mechanical transmission technologies. The method includes the following steps: (S0) starting; (S1) state observation: a current operating state of each element of the electro-mechanical transmission system is obtained through state observation; (S2) dynamic prediction: a feasible operating range of each element of the electro-mechanical transmission system is obtained through dynamic prediction; (S3) optimal decision: an optimal control command of each element in the optimal decision is formulated and executed; (S4) feedback correction: feedback correction is performed on control amounts of a motor and an engine of the electro-mechanical transmission system by using state deviations; and (S5) determining whether feedback correction meets a requirement, and if feedback correction meets the requirement, ending the process, or if feedback correction does not meet the requirement, repeating (S1).

公开(公告)号：US20200369288A1

公开(公告)日：2020-11-26

申请号：US16878729

申请日：2020-05-20

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Hui LIU ,  Hongji SHEN ,  Shengli LI ,  Xiaoyu ZHANG ,  Xiaoxia FENG

IPC: B60W50/04 ,  B60W20/50 ,  G06F17/16

Abstract: The present invention discloses a method for constructing linear luenberger observer for vehicle control. The method for constructing linear luenberger observer for vehicle control comprises the following steps: step 1: building a state-space equation of a driving system of a vehicle to judge observability of the driving system; step 2: dividing the state of the driving system into blocks, and reconstructing state components of the driving system to obtain an rewritten state observation equation of the driving system; step 3: introducing transformation into the rewritten state equation of the driving system to obtain an expression equation and an error equation of the Luenberger observer. The linear luenberger observer constructed by the present invention has low implementation difficulty. High-frequency noise in an output signal of a rotational speed sensor is reduced.

公开(公告)号：US10822542B2

公开(公告)日：2020-11-03

申请号：US15574089

申请日：2016-05-13

Applicant: Beijing Institute of Technology

Inventor： Haizheng Zhong ,  Qingchao Zhou ,  Feng Zhang ,  Hailong Huang

IPC: C09K11/02 ,  C09K11/06 ,  C09K11/75 ,  B82Y20/00 ,  H01L51/50 ,  H01L51/52 ,  H01L27/32 ,  C09K11/66 ,  H01L51/00 ,  G02F1/13357 ,  H01L41/18

Abstract: Provided is a composite luminescent material. The composite luminescent material comprises: a matrix; and perovskite nanoparticles. The perovskite nanoparticles are dispersed in the matrix, wherein the mass ratio of the perovskite nanoparticles matrix to the perovskite nanoparticles is 1:(1-50).

公开(公告)号：US20200321668A1

公开(公告)日：2020-10-08

申请号：US16732660

申请日：2020-01-02

Applicant: Beijing Institute of Technology

Inventor： Rui XIONG ,  Zeyu CHEN ,  Hongwen HE ,  Fengchun SUN

IPC: H01M10/637 ,  H01M10/615 ,  H01M10/633 ,  H01M10/48 ,  H05B3/00

Abstract: The present invention relates to a rapid low-temperature self-heating method and device for a battery. Active controllable large-current lossless short-circuit self-heating cooperates with an external heater to implement rapid composite heating, so that a battery is rapidly heated in a low-temperature environment and is controlled to fall within an optimal working temperature interval, so as to improve energy utilization of the battery and durability of a battery system. Before the battery system is started, battery temperature is first determined; when the temperature is less than a threshold, an external short-circuit is first proactively triggered to generate a large current to implement self-heating inside the battery. A method for determining a large-current lossless short-circuit time threshold is disclosed. A lossless time threshold of an external short-circuit of a battery is constructed according to a critical time and a second current peak of the short-circuit, ensuring that the service life and safety of the battery are not affected during rapid short-circuit heating; further, a temperature rise of lossless short-circuit self-heating of the battery is estimated based on a model, where if the temperature rise does not reach target temperature, the external heater is started for cooperative work, to make temperature of the battery system rise and kept in the optimal working temperature interval. The method is simple, easy to implement, and safe and reliable, and can effectively resolve a problem that an electric vehicle has large capacity degradation and poor working performance in a low-temperature severe cold working condition.

公开(公告)号：US20200270712A1

公开(公告)日：2020-08-27

申请号：US16796542

申请日：2020-02-20

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Chunguang XU ,  Peng YIN ,  Yuren LU ,  Jianfeng SONG ,  Peilu LI ,  Dezhi LI ,  Zhaowei MIAO

IPC: C21D1/04 ,  C21D10/00

Abstract: The present disclosure relates to a method for reducing and homogenizing residual stress of a component, which comprises: detecting stress value(s) of regulation portion(s) of the component; placing the component in a container containing a fluid medium so as to immerse the component in the fluid medium; emitting, by an acoustic wave generator, an elastic wave to the fluid medium in a manner of emitting towards the regulation portion(s) of the component, and determining an emitting period of time and a frequency of the elastic wave based on the stress value(s); returning to the step S1 when the emitting period of time has elapsed, until the stress value(s) is stable. The method and the device solve the problems that it is difficult to reduce and homogenize the residual stress on high-precision machined components, complex structural components, thin-walled structural components, and low-stiffness components.

公开(公告)号：US10685151B2

公开(公告)日：2020-06-16

申请号：US15377941

申请日：2016-12-13

Applicant: Beijing Institute of Technology

Inventor： Jianhua Liu ,  Naijing Lv ,  Xiaoyu Ding ,  Shaoli Liu ,  Jiashun Liu ,  Haili Lin ,  Jiangtao Ma

IPC: G06F30/20 ,  G06F17/11 ,  G06F17/16 ,  G06F111/10 ,  G06F113/16

Abstract: A method for simulating a posture of a flexible cable based on a spring-mass model combining bending and torsion includes: establishing a physical property model of the cable, wherein a torsion property is represented by a torsion spring attached at each 55 cable segment; obtaining an initial position of each discrete mass point based on a total length of the cable and the number of the cable segments; identifying discrete mass points at both ends as fixed points, and obtaining their position information; calculating stress information of other discrete mass points whose position information is not determined based on the physical property model; sequentially calculating 10 10 equilibrium positions of the other discrete mass points by using the stress information and the initial positions to obtain their the position information; and simulating a stable posture of the cable based on the position information of the fixed points and the other discrete mass points.

公开(公告)号：US20200043715A1

公开(公告)日：2020-02-06

申请号：US16531233

申请日：2019-08-05

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Wei XU ,  Ting JIANG ,  Qi GUO ,  Qian XU

IPC: H01J49/42

Abstract: An ion resonance excitation operation method and device by applying a quadrupolar electric field combined with a dipolar electric field. The method includes applying a main RF to any pair of plates of the ion trap mass analyzer, and applying a quadrupolar excitation signal to any pair of plates, and applying a reverse phase dipolar excitation signal to any pair of plates. Also provided is an ion resonance excitation operation method and device by using a quadrupolar electric field combined with a dipolar electric field, which includes applying a positive main RF to a pair of electrode rods of the quadrupole, and applying a negative main RF to the other pair of electrode rods; applying a quadrupolar excitation signal to any pair of electrode rods, applying a reverse phase dipolar excitation signal to any pair of electrode rods.

公开(公告)号：US10421902B2

公开(公告)日：2019-09-24

申请号：US15750281

申请日：2017-06-21

Applicant: BOE TECHNOLOGY GROUP CO., LTD. ,  BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Haizheng Zhong ,  Lige Liu

IPC: C09K11/66 ,  B82Y20/00 ,  C07F13/00 ,  C07F1/08 ,  C07F7/22 ,  C07F7/24 ,  C07F7/30 ,  C09K11/02 ,  C09K11/06 ,  G02F1/1335 ,  B82Y40/00 ,  B82Y30/00 ,  C09K11/57 ,  C09K11/58 ,  C09K11/74

Abstract: The present application discloses a method of preparing a luminescent nano-sheet. The method includes preparing a precursor emulsion solution containing a metal halide and RNH3X, and having a molar ratio of metal halide to RNH3X in a range of approximately 0.6 to approximately 0.8; demulsifying the precursor emulsion solution to obtain a perovskite quantum dots material and a demulsified solution; and forming the luminescent nano-sheet by allowing the perovskite quantum dots material self-assemble into the luminescent nano-sheet. X is a halide, R is selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, and heterocyclyl.

公开(公告)号：US20190271847A1

公开(公告)日：2019-09-05

申请号：US16366204

申请日：2019-03-27

Applicant: Arizona Board of Regents on Behalf of the University of Arizona ,  BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Dewen Cheng ,  Yongtian Wang ,  Hong Hua

IPC: G02B27/01 ,  G02B5/04

Abstract: A tiled head-mounted display device, comprising: an optical component including a plurality of prisms with free-form surfaces, each prism being a wedge prism comprising a first optical surface, a second optical surface and a third optical surface; and a display component including a plurality of micro-displays, wherein the number of the micro-displays and the number of the prisms with free-form surfaces is identical. The tiled head-mounted display device according to the present invention is compact and light, provides wide field of view and high resolution, especially for the optical tiling head-mounted display device, the exit pupil planes of each display channels are coincident, thus avoiding pupil aberration and keeping exit pupil diameter and eye clearance same as the single ocular. There is no resolution variance throughout the entire field of view, thus preventing extra trapezoid distortion. The tiled head-mounted display device according to the present invention can be readily applicable to augmented environments applications by simply adding an auxiliary free-form lens behind the free-form prism.