Patents by Inventor Yoshihiro Kumagae

Yoshihiro Kumagae 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).

  • Control system, work machine, and control method
    Patent number: 11047112
    Abstract: A control system includes: an engine; a first hydraulic pump and a second hydraulic pump driven by the engine; a switching device provided in a flow path that connects the first hydraulic pump to the second hydraulic pump, and configured to perform switching between a merged state in which the flow path is opened and a separated state in which the flow path is closed; a first hydraulic actuator to which hydraulic fluid discharged from the first hydraulic pump is supplied in the separated state; a second hydraulic actuator to which hydraulic fluid discharged from the second hydraulic pump is supplied in the separated state; a determining unit configured to determine whether output of the engine is limited; and a merging-separating control unit configured to control the switching device so as to perform switching to the merged state when the determining unit determines that output of the engine is limited.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: June 29, 2021
    Assignee: Komatsu Ltd.
    Inventors: Shimon Jimbo, Kenichi Kitamura, Yoshihiro Kumagae
  • CONTROL SYSTEM, WORK MACHINE, AND CONTROL METHOD
    Publication number: 20190032306
    Abstract: A control system includes: an engine; a first hydraulic pump and a second hydraulic pump driven by the engine; a switching device provided in a flow path that connects the first hydraulic pump to the second hydraulic pump, and configured to perform switching between a merged state in which the flow path is opened and a separated state in which the flow path is closed; a first hydraulic actuator to which hydraulic fluid discharged from the first hydraulic pump is supplied in the separated state; a second hydraulic actuator to which hydraulic fluid discharged from the second hydraulic pump is supplied in the separated state; a determining unit configured to determine whether output of the engine is limited; and a merging-separating control unit configured to control the switching device so as to perform switching to the merged state when the determining unit determines that output of the engine is limited.
    Type: Application
    Filed: July 27, 2017
    Publication date: January 31, 2019
    Inventors: Shimon Jimbo, Kenichi Kitamura, Yoshihiro Kumagae