Patents by Inventor Xiongfei LIU

Xiongfei LIU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250105625
    Abstract: A power converter and a method. When the voltage at the grid connection point exceeds the preset voltage range and an amplitude of a voltage output by the power conversion circuit is not greater than a voltage threshold, embodiments can control the amplitude of the current output by the power conversion circuit to be not greater than a second current threshold, where the second current threshold is greater than the first current threshold, and a ratio of an active current to a reactive current output by the power conversion circuit is constant or changes; or, when the amplitude of the voltage output by the power conversion circuit is greater than the voltage threshold, embodiments can control the amplitude of the current output by the power conversion circuit to be equal to the second current threshold, where the ratio of the active current to the reactive current changes.
    Type: Application
    Filed: September 17, 2024
    Publication date: March 27, 2025
    Applicant: Huawei Digital Power Technologies Co., Ltd.
    Inventors: Xiongfei WANG, Teng Liu, Mingquan Zhao, Meiqing Zhang, Kai Xin, Yunfeng Liu
  • Patent number: 12255464
    Abstract: An islanding detection method includes: an alternating current frequency of an inverter is monitored. The alternating current frequency fluctuates within a preset range when in a normal mode. When an instantaneous shifting value of the alternating current frequency exceeds the preset range, a frequency detected before instantaneous shifting is a first frequency. When a frequency in first frequency data within a first preset time period is greater than or less than only the first frequency, an alternating current frequency detected when the first preset time period ends is a second frequency. Output power of the inverter is continuously adjusted based on a change in the current alternating current frequency. When a frequency in second frequency data within a second preset time period is greater than or less than only the second frequency, it may be indicated in time that islanding occurs in the inverter, and an islanding status is reported.
    Type: Grant
    Filed: May 12, 2023
    Date of Patent: March 18, 2025
    Assignee: Huawei Digital Power Technologies Co., Ltd.
    Inventors: Xiongfei Wang, Fangcheng Liu, Teng Liu
  • Publication number: 20250086355
    Abstract: A train crash energy management (CEM) optimization method based on machine learning is provided. The method includes: establishing a finite element model that is for an eight-marshalling train crash and considers a train energy absorption subsystem and a wheel-rail rolling contact behavior; establishing a machine learning database for train crash energy absorption; constructing a machine learning prediction model for the train crash energy absorption; and performing multi-objective optimization on CEM of a train based on machine learning.
    Type: Application
    Filed: May 30, 2024
    Publication date: March 13, 2025
    Applicant: Southwest Jiaotong University
    Inventors: Lin JING, Shaodong ZHENG, Kai LIU, Xiongfei ZHOU, Kaiyun WANG
  • Publication number: 20240353304
    Abstract: The present disclosure relates to a method and a device for predicting ability of a temporary plugging agent to plug cracks and a storage medium, and includes the following steps: calculating a plane elastic modulus of a core through experiments, acquiring a maximum force load of a specimen, calculating rock fracture toughness through the maximum force load, manufacturing an artificial crack model and placing it in a core holder, preparing temporary plugging deflection fluid by selecting a temporary plugging agent, injecting the temporary plugging deflection fluid into the artificial crack so as to calculate apparent fracture toughness of the temporarily plugged crack, and finally calculating a fracture pressure of the temporarily plugged crack based on the calculated rock fracture toughness and the plane elastic modulus of the core. Through the above method, the present disclosure provides a standard fracture pressure calculation method.
    Type: Application
    Filed: April 19, 2024
    Publication date: October 24, 2024
    Inventors: Daobing Wang, Bo Yu, Haiyan Zhu, Fujian Zhou, Dongliang Sun, Xiongfei Liu, Tiankui Guo, Xiuhui Li, Xuanhe Tang, Xian Shi, Qing Liu, Yu Suo, Yang Shi
  • Publication number: 20240256716
    Abstract: A data access method includes obtaining a data access request for M storage devices, M being an integer greater than or equal to 2, determining a target access mode for the M storage devices based on the data access request, and performing data access on the storage devices based on access control signals matching the target access mode for the storage devices. The target access mode includes a first access mode and a second access mode. Access security and/or access speed generated when the data access is performed on the storage devices in the first access mode is different from access security and/or access speed generated in the second access mode.
    Type: Application
    Filed: January 26, 2024
    Publication date: August 1, 2024
    Inventors: XIONGFEI LIU, QIAOYU YE, LIHANG ZHANG, SHAOHUI GONG, JUN PENG
  • Publication number: 20240012775
    Abstract: A multi-chip interconnection system includes a plurality of chips. A chip of the plurality of chips includes an extend serial peripheral interface (XSPI) master terminal, a data transmission terminal, an XSPI slave terminal, and a data reception terminal. The XSPI master terminal includes an advanced extensible interface (AXI) slave interface. The data transmission terminal accesses the AXI slave interface via an AXI bus. The XSPI slave terminal includes an AXI master interface. The data reception terminal accesses the AXI master interface via the AXI bus. An XSPI master terminal of a chip is connected to an XSPI slave terminal of another chip via an XSPI bus. The XSPI master terminal of the chip performs encoding on AXI information of the data transmission terminal of the chip received via the AXI bus and transmits encoded AXI information to the XSPI slave terminal of the another chip via the XSPI bus.
    Type: Application
    Filed: January 26, 2023
    Publication date: January 11, 2024
    Inventors: Xiongfei LIU, Qiaoyu YE, Shaohui GONG, Lihang ZHANG
  • Patent number: 10800892
    Abstract: A nano-emulsion composition having a small particle size and ultra-low concentration and a preparation method thereof is disclosed. The raw materials of the composition comprise, in terms of percentage by weight, 0.002% to 0.2% of a polymer-containing homogeneous microemulsion, water, and 99.998% to 99.8% of an organic salt solution or inorganic salt solution. The composition is prepared by diluting a polymer-containing homogeneous microemulsion with water or a salt solution. The polymer-containing homogeneous microemulsion is formed by mixing the following raw materials, in terms of percentage by weight: 8% to 40% of a surfactant, 0.5% to 10% of a polymer, 10% to 30% of an alcohol, 3% to 30% of an oil, 0% to 20% of a salt, and balance of water. The composition of the invention is low in concentration, low in cost, narrow in particle size distribution, good in stability, simple in preparation, and convenient for storage and use.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: October 13, 2020
    Assignees: China University of Petroleum-Beijing, KMS OIL FIELD CHEMICALS & TECHNICAL SERVICES LTD., Zhong Shi Da Engineering Research Center Co. Ltd., PetroChina Company Limited
    Inventors: Fujian Zhou, Erdong Yao, Jiangwen Xu, Zhao Luo, Yuan Li, Xiuhui Li, Jiaxin Sun, Xiongfei Liu, Jie Zuo, Xugang Wang, Cuihong Zhou
  • Publication number: 20190177491
    Abstract: A nano-emulsion composition having a small particle size and ultra-low concentration and a preparation method thereof is disclosed. The raw materials of the composition comprise, in terms of percentage by weight, 0.002% to 0.2% of a polymer-containing homogeneous microemulsion, water, and 99.998% to 99.8% of an organic salt solution or inorganic salt solution. The composition is prepared by diluting a polymer-containing homogeneous microemulsion with water or a salt solution. The polymer-containing homogeneous microemulsion is formed by mixing the following raw materials, in terms of percentage by weight: 8% to 40% of a surfactant, 0.5% to 10% of a polymer, 10% to 30% of an alcohol, 3% to 30% of an oil, 0% to 20% of a salt, and balance of water. The composition of the invention is low in concentration, low in cost, narrow in particle size distribution, good in stability, simple in preparation, and convenient for storage and use.
    Type: Application
    Filed: December 13, 2018
    Publication date: June 13, 2019
    Inventors: Fujian ZHOU, Erdong YAO YAO, Jiangwen XU, Zhao LUO, Yuan LI, Xiuhui LI, Jiaxin SUN, Xiongfei LIU, Jie ZUO, Xugang WANG, Cuihong ZHOU
  • Patent number: D1050586
    Type: Grant
    Filed: July 31, 2024
    Date of Patent: November 5, 2024
    Inventor: Xiongfei Liu