Patents by Inventor Yasumasa Ishikawa

Yasumasa Ishikawa 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).

  • Patent number: 11960618
    Abstract: A computer implemented method searches data. A number of processor units generates a candidate search result using an index for a data source in response to a search query by a user, wherein the candidate search result comprises files accessible by the user based on access control information in the index. The number of processor units generates a completed search result with a set of the files from the candidate search result having a confidentiality level less than or equal to a threshold confidentiality level. The number of processor units determines whether the user has access to a file in the candidate search result in which the file has the confidentiality level greater than the threshold confidentiality level for the data source. The number of processor units adds the file to the completed search result in response to the file being accessible by the user in the data source.
    Type: Grant
    Filed: September 1, 2021
    Date of Patent: April 16, 2024
    Assignee: International Business Machines Corporation
    Inventors: Tohru Hasegawa, Shunsuke Ishikawa, Yasumasa Kajinaga, Keisuke Nitta, Daiki Tsuzuku
  • Patent number: 11674467
    Abstract: An injection control device for a fuel injection valve includes: a current detection unit, a current area correction control unit, a storage unit, and a reference current value correction unit. The current area correction control unit corrects, based on an energization current profile, an area correction amount of an energization time to equalize the integrated current value of the energization current profile and an integrated current value of the detected current, and obtains the integrated current value of the current based on an attainment time from a start of energization of the fuel injection valve to an attainment of each of plural reference current values. The storage unit stores a reference attainment time. The reference current value correction unit corrects each reference current value based on a difference between the reference attainment time and a detected attainment time at a time of actual drive.
    Type: Grant
    Filed: July 14, 2021
    Date of Patent: June 13, 2023
    Assignee: DENSO CORPORATION
    Inventors: Kosuke Kato, Hiroyuki Fukuda, Yasumasa Ishikawa
  • Patent number: 11466637
    Abstract: An injection control device controls fuel injection to an internal-combustion engine by driving a fuel injection valve with an electric current to open and close the valve. The injection control device includes a boost circuit boosting a battery voltage; a boost controller controlling the boosting of the boost circuit; and a charge control setter setting charge permission or charge prohibition of the boost circuit to the boost controller. The charge control setter sets the charge permission or charge prohibition of the boost circuit to the boost controller according to a magnitude of an influence of a drive current error.
    Type: Grant
    Filed: September 15, 2021
    Date of Patent: October 11, 2022
    Assignee: DENSO CORPORATION
    Inventors: Kosuke Kato, Hiroyuki Fukuda, Yasumasa Ishikawa
  • Patent number: 11326538
    Abstract: An injection control device for a fuel injection valve includes: a current detection unit of the fuel injection valve; a current area correction control unit that performs current area correction for an area correction amount of an energization time to equalize the integrated current value of the energization current profile and an integrated current value of the detected current; and an information correction unit that learns and stores a reference attainment time, from a start of energization to an attainment of each of the plurality of reference currents, in a storage unit, and corrects information related to the current area correction based on a difference between the reference attainment time and an actual attainment time from the start of energization to the attainment of each reference current.
    Type: Grant
    Filed: July 14, 2021
    Date of Patent: May 10, 2022
    Assignee: DENSO CORPORATION
    Inventors: Kosuke Kato, Hiroyuki Fukuda, Yasumasa Ishikawa
  • Patent number: 11326545
    Abstract: An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of a fuel injection valve; a fuel injection quantity correction unit that calculates an air-fuel correction amount and corrects the command value for the fuel injection quantity; and a controller that executes current control on the fuel injection valve. The controller executes current area correction by calculating an area correction amount for an energization time. The injection control device further includes a learning controller that stops the air-fuel learning.
    Type: Grant
    Filed: May 28, 2021
    Date of Patent: May 10, 2022
    Assignee: DENSO CORPORATION
    Inventors: Kosuke Kato, Yasumasa Ishikawa, Yohei Suganuma
  • Publication number: 20220090556
    Abstract: An injection control device controls fuel injection to an internal-combustion engine by driving a fuel injection valve with an electric current to open and close the valve. The injection control device includes a boost circuit boosting a battery voltage; a boost controller controlling the boosting of the boost circuit; and a charge control setter setting charge permission or charge prohibition of the boost circuit to the boost controller. The charge control setter sets the charge permission or charge prohibition of the boost circuit to the boost controller according to a magnitude of an influence of a drive current error.
    Type: Application
    Filed: September 15, 2021
    Publication date: March 24, 2022
    Inventors: Kosuke KATO, Hiroyuki FUKUDA, Yasumasa ISHIKAWA
  • Patent number: 11255286
    Abstract: An injection control device includes: an area correction unit that calculates an energization time correction amount by performing area correction of a current flowing through a fuel injection valve when executing a current drive of a fuel injection valve to inject a fuel from the fuel injection valve in a multi-stage injection; and a change unit that changes an upper limit guard value of the energization time correction amount according to an injection time of the multi-stage injection during control of the multi-stage injection.
    Type: Grant
    Filed: June 21, 2021
    Date of Patent: February 22, 2022
    Assignee: DENSO CORPORATION
    Inventors: Yasumasa Ishikawa, Masashi Inaba, Kosuke Kato
  • Publication number: 20220018301
    Abstract: An injection control device for a fuel injection valve includes: a current detection unit of the fuel injection valve; a current area correction control unit that performs current area correction for an area correction amount of an energization time to equalize the integrated current value of the energization current profile and an integrated current value of the detected current; and an information correction unit that learns and stores a reference attainment time, from a start of energization to an attainment of each of the plurality of reference currents, in a storage unit, and corrects information related to the current area correction based on a difference between the reference attainment time and an actual attainment time from the start of energization to the attainment of each reference current.
    Type: Application
    Filed: July 14, 2021
    Publication date: January 20, 2022
    Inventors: Kosuke KATO, Hiroyuki FUKUDA, Yasumasa ISHIKAWA
  • Publication number: 20220016658
    Abstract: An injection control device for a fuel injection valve includes: a current detection unit; and a current area correction control unit that corrects, based on an energization current profile, an area correction amount of an energization time to equalize the integrated current value of the energization current profile and an integrated current value of the detected current, and obtains the integrated current value of the current based on an attainment time from a start of energization of the fuel injection valve to an attainment of each of a plurality of reference current values; a storage unit that stores a reference attainment time; and a reference current value correction unit that corrects each reference current value based on a difference between the reference attainment time and a detected attainment time at a time of actual drive.
    Type: Application
    Filed: July 14, 2021
    Publication date: January 20, 2022
    Inventors: Kosuke KATO, Hiroyuki FUKUDA, Yasumasa ISHIKAWA
  • Publication number: 20210404411
    Abstract: An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of a fuel injection valve; a fuel injection quantity correction unit that calculates an air-fuel correction amount and corrects the command value for the fuel injection quantity; and a controller that executes current control on the fuel injection valve. The controller executes current area correction by calculating an area correction amount for an energization time. The injection control device further includes a learning controller that stops the air-fuel learning.
    Type: Application
    Filed: May 28, 2021
    Publication date: December 30, 2021
    Inventors: Kosuke Kato, Yasumasa Ishikawa, Yohei Suganuma
  • Publication number: 20210404401
    Abstract: An injection control device includes: an area correction unit that calculates an energization time correction amount by performing area correction of a current flowing through a fuel injection valve when executing a current drive of a fuel injection valve to inject a fuel from the fuel injection valve in a multi-stage injection; and a change unit that changes an upper limit guard value of the energization time correction amount according to an injection time of the multi-stage injection during control of the multi-stage injection.
    Type: Application
    Filed: June 21, 2021
    Publication date: December 30, 2021
    Inventors: YASUMASA ISHIKAWA, MASASHI INABA, KOSUKE KATO
  • Patent number: 11181067
    Abstract: An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of a fuel injection valve; and a controller that executes current control on the fuel injection valve. The controller executes current area correction by calculating an area correction amount for an energization time to cause an integrated current value of an energization current profile and the integrated current value of a current to be equal to each other. Correction control of the current area correction is changed based on a detection signal of a cooling water temperature of an internal combustion engine.
    Type: Grant
    Filed: May 28, 2021
    Date of Patent: November 23, 2021
    Assignee: DENSO CORPORATION
    Inventors: Kosuke Kato, Yasumasa Ishikawa, Yohei Suganuma, Masashi Inaba
  • Patent number: 11181068
    Abstract: An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of the fuel injection valve; a fuel injection quantity correction unit that calculates an A/F correction amount and corrects the command value of the fuel injection quantity; and a controller that executes current control on the fuel injection valve. The controller executes current area correction. The injection control device further includes an area correction abnormality determination unit that determines an area correction abnormality. The area correction abnormality determination unit changes the abnormality determination value.
    Type: Grant
    Filed: May 28, 2021
    Date of Patent: November 23, 2021
    Assignee: DENSO CORPORATION
    Inventors: Kosuke Kato, Yasumasa Ishikawa