Patents by Inventor Ryoichi Hagiwara

Ryoichi Hagiwara 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: 11428177
    Abstract: An engine device including an intake manifold configured to supply air into a cylinder; an exhaust manifold configured to output exhaust gas from the cylinder; a gas injector which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve configured to inject a liquid fuel into the cylinder for combustion. At the time of switching from a gas mode in which the gaseous fuel is supplied into the cylinder to a diesel mode in which the liquid fuel is supplied into the cylinder, a supply-start timing of the liquid fuel is delayed relative to a supply-stop timing of the gaseous fuel.
    Type: Grant
    Filed: July 30, 2021
    Date of Patent: August 30, 2022
    Assignee: YANMAR POWER TECHNOLOGY CO., LTD.
    Inventors: Ryoichi Hagiwara, Kazuteru Toshinaga, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
  • Publication number: 20210355886
    Abstract: An engine device including an intake manifold configured to supply air into a cylinder; an exhaust manifold configured to output exhaust gas from the cylinder; a gas injector which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve configured to inject a liquid fuel into the cylinder for combustion. At the time of switching from a gas mode in which the gaseous fuel is supplied into the cylinder to a diesel mode in which the liquid fuel is supplied into the cylinder, a supply-start timing of the liquid fuel is delayed relative to a supply-stop timing of the gaseous fuel.
    Type: Application
    Filed: July 30, 2021
    Publication date: November 18, 2021
    Inventors: Ryoichi HAGIWARA, Kazuteru TOSHINAGA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
  • Patent number: 11111866
    Abstract: An engine device including an intake manifold configured to supply air into a cylinder; an exhaust manifold configured to output exhaust gas from the cylinder; a gas injector which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve configured to inject a liquid fuel into the cylinder for combustion. At the time of switching from a gas mode in which the gaseous fuel is supplied into the cylinder to a diesel mode in which the liquid fuel is supplied into the cylinder, a supply-start timing of the liquid fuel is delayed relative to a supply-stop timing of the gaseous fuel.
    Type: Grant
    Filed: May 27, 2020
    Date of Patent: September 7, 2021
    Assignee: YANMAR POWER TECHNOLOGY CO., LTD.
    Inventors: Ryoichi Hagiwara, Kazuteru Toshinaga, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
  • Publication number: 20200284213
    Abstract: An engine device including an intake manifold configured to supply air into a cylinder; an exhaust manifold configured to output exhaust gas from the cylinder; a gas injector which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve configured to inject a liquid fuel into the cylinder for combustion. At the time of switching from a gas mode in which the gaseous fuel is supplied into the cylinder to a diesel mode in which the liquid fuel is supplied into the cylinder, a supply-start timing of the liquid fuel is delayed relative to a supply-stop timing of the gaseous fuel.
    Type: Application
    Filed: May 27, 2020
    Publication date: September 10, 2020
    Inventors: Ryoichi HAGIWARA, Kazuteru TOSHINAGA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
  • Patent number: 10690069
    Abstract: An engine device of the present invention includes including: an intake manifold configured to supply air into a cylinder; an exhaust manifold configured to output exhaust gas from the cylinder; a gas injector which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve configured to inject a liquid fuel into the cylinder for combustion. At the time of switching from a gas mode in which the gaseous fuel is supplied into the cylinder to a diesel mode in which the liquid fuel is supplied into the cylinder, a supply-start timing of the liquid fuel is delayed relative to a supply-stop timing of the gaseous fuel.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: June 23, 2020
    Assignee: YANMAR CO., LTD.
    Inventors: Ryoichi Hagiwara, Kazuteru Toshinaga, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
  • Patent number: 10393035
    Abstract: An engine device including: an intake manifold configured to supply air into a cylinder; an exhaust manifold configured to output exhaust gas from the cylinder; a gas injector which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve configured to inject a liquid fuel into the cylinder for combustion. At the time of switching the operation mode from one to the other between a gas mode and a diesel mode, an instant switching to the diesel mode is executed when the engine rotation number is determined to approach the upper limit value which leads to an emergency stop of the engine device.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: August 27, 2019
    Assignee: YANMAR CO., LTD.
    Inventors: Ryoichi Hagiwara, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
  • Patent number: 10378461
    Abstract: An engine device (21) including: an intake manifold (67) configured to supply air into a cylinder (77), an exhaust manifold (44) configured to output exhaust gas from the cylinder; a gas injector (98) which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve (79) configured to inject a liquid fuel into the cylinder for combustion. At the time of switching the operation mode from one to another between a gas mode and a diesel mode, a supply amount of a first fuel to be supplied in a post-switching operation mode is increased to a switching threshold value through an increase control which monotonously increases the supply amount, and then is controlled by a speed-governing control based on the engine rotation number. The switching threshold value is set based on the engine rotation number or the engine load.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: August 13, 2019
    Assignee: YANMAR CO., LTD.
    Inventors: Ryoichi Hagiwara, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
  • Patent number: 10267254
    Abstract: An engine device of including: an intake manifold configured to supply air into a cylinder; a gas injector configured to mix fuel gas with air supplied from the intake manifold, and supply mixed gas to the cylinder; an igniter configured to ignite, in the cylinder, premixed fuel obtained by pre-mixing the fuel gas with the air; and a control unit configured to execute a combustion control of a premixed fuel based on the output signal indicative of an output from the engine device. When the air amount is determined to be insufficient and when the output signal is lost, the control unit estimates an output signal based on the fuel gas injection amount from the gas injector, and executes the combustion control based on the estimated output signal.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: April 23, 2019
    Assignee: YANMAR CO., LTD.
    Inventors: Ryoichi Hagiwara, Osamu Yamagishi, Naoya Ikeda
  • Publication number: 20190085773
    Abstract: An engine device (21) including: an intake manifold (67) configured to supply air into a cylinder (77); an exhaust manifold (44) configured to output exhaust gas from the cylinder (77); a gas injector (98) which mixes a gaseous fuel with the air supplied from the intake manifold 67; and a main fuel injection valve (79) configured to inject a liquid fuel into the cylinder (77) for combustion. At the time of switching the operation mode from one to the other between a gas mode and a diesel mode, an instant switching to the diesel mode is executed when the engine rotation number is determined to approach the upper limit value which leads to an emergency stop of the engine device.
    Type: Application
    Filed: May 24, 2016
    Publication date: March 21, 2019
    Applicant: Yanmar Co., Ltd.
    Inventors: Ryoichi HAGIWARA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
  • Patent number: 10221796
    Abstract: An engine device including an intake manifold (67) configured to supply air into a cylinder (36), a gas injector (98) configured to mix fuel gas with air supplied from the intake manifold (67), and supply mixed gas to the cylinder (36), and an igniter (79) configured to ignite, in the cylinder (36) premixed fuel obtained by pre-mixing the fuel gas with the air, the engine device further including a controlling unit (73) configured to determine an air amount in the premixed fuel in the cylinder (36). The controlling unit (73) performs in multiple steps retard control of ignition timing by the igniter (79), when the air amount is insufficient, and performs in multiple steps advance control of the ignition timing, when the air amount is sufficient.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: March 5, 2019
    Assignee: Yanmar Co., Ltd.
    Inventors: Ryoichi Hagiwara, Osamu Yamagishi, Naoya Ikeda
  • Publication number: 20180298840
    Abstract: An engine device including: an intake manifold (67) configured to supply air into a cylinder (77); a gas injector (98) configured to mix fuel gas with air supplied from the intake manifold (67), and supply mixed gas to the cylinder (77); an igniter (79) configured to ignite, in the cylinder (77), premixed fuel obtained by pre-mixing the fuel gas with the air; and a control unit (73) configured to execute a combustion control of a premixed fuel based on the output signal indicative of an output from the engine device. When the air amount is determined to be insufficient and when the output signal is lost, the control unit (73) estimates an output signal based on the fuel gas injection amount from the gas injector (98), and executes the combustion control based on the estimated output signal.
    Type: Application
    Filed: May 24, 2016
    Publication date: October 18, 2018
    Applicant: Yanmar Co., Ltd.
    Inventors: Ryoichi HAGIWARA, Osamu YAMAGISHI, Naoya IKEDA
  • Patent number: 10094309
    Abstract: An engine device executes the control of the opening degree of a main throttle valve when engine load is in a low load area. In contrast, when the engine load is in a medium-to-high load area, the engine device sets the main throttle valve to a predetermined opening degree and executes the control of the opening degree of an air supply bypass valve.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: October 9, 2018
    Assignee: Yanmar Co., Ltd.
    Inventors: Ryoichi Hagiwara, Osamu Yamagishi
  • Publication number: 20180258868
    Abstract: An engine device (21) including: an intake manifold (67) configured to supply air into a cylinder (77), an exhaust manifold (44) configured to output exhaust gas from the cylinder; a gas injector (98) which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve (79) configured to inject a liquid fuel into the cylinder for combustion. At the time of switching the operation mode from one to another between a gas mode and a diesel mode, a supply amount of a first fuel to be supplied in a post-switching operation mode is increased to a switching threshold value through an increase control which monotonously increases the supply amount, and then is controlled by a speed-governing control based on the engine rotation number. The switching threshold value is set based on the engine rotation number or the engine load.
    Type: Application
    Filed: May 24, 2016
    Publication date: September 13, 2018
    Applicant: Yanmar Co., Ltd.
    Inventors: Ryoichi HAGIWARA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
  • Publication number: 20180252174
    Abstract: An engine device (21) including: an intake manifold (67) configured to supply air into a cylinder (77); an exhaust manifold (44) configured to output exhaust gas from the cylinder (77); a gas injector (98) which mixes a gaseous fuel with the air supplied from the intake manifold (67); and a main fuel injection valve (79) configured to inject a liquid fuel into the cylinder (77) for combustion. At the time of switching from a gas mode in which the gaseous fuel is supplied into the cylinder 77 to a diesel mode in which the liquid fuel is supplied into the cylinder (77), a supply-start timing of the liquid fuel is delayed relative to a supply-stop timing of the gaseous fuel.
    Type: Application
    Filed: May 24, 2016
    Publication date: September 6, 2018
    Applicant: Yanmar Co., Ltd.
    Inventors: Ryoichi HAGIWARA, Kazuteru TOSHINAGA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
  • Publication number: 20180216559
    Abstract: An engine device including an intake manifold (67) configured to supply air into a cylinder (36) a gas injector (98) configured to mix fuel gas with air supplied from the intake manifold (67) and supply mixed gas to the cylinder (36) and an igniter (79) configured to ignite, in the cylinder (36) premixed fuel obtained by pre-mixing the fuel gas with the air, the engine device further including a controlling unit (73) configured to determine an air amount in the premixed fuel in the cylinder (36) The controlling unit (73) performs in multiple steps retard control of ignition timing by the igniter (79), when the air amount is insufficient, and performs in multiple steps advance control of the ignition timing, when the air amount is.
    Type: Application
    Filed: May 24, 2016
    Publication date: August 2, 2018
    Applicant: Yanmar Co., Ltd.
    Inventors: Ryoichi HAGIWARA, Osamu YAMAGISHI, Naoya IKEDA
  • Publication number: 20160363065
    Abstract: An engine device executes the control of the opening degree of a main throttle valve when engine load is in a low load area. In contrast, when the engine load is in a medium-to-high load area, the engine device sets the main throttle valve to a predetermined opening degree and executes the control of the opening degree of an air supply bypass valve.
    Type: Application
    Filed: August 26, 2016
    Publication date: December 15, 2016
    Inventors: Ryoichi HAGIWARA, Osamu YAMAGISHI
  • Patent number: 9476620
    Abstract: In a cogeneration system 1 configured to supply electricity and heat with a gas engine 5 as an engine and including a thermally driven heat pump 3 and a thermally-driven-heat-pump assisted electric heat pump 4 as an electrically driven heat pump, a controller 44 as an operation controller configured to perform a power control in such a manner that generated electricity e of the gas engine 5 becomes equal to balance electricity eb as the sum of required electricity De2 for driving a thermally-driven-heat-pump assisted electrically driven heat pump 4 configured to compensate heat demand Dh of the cogeneration system 1 and electricity demand De1 of the cogeneration system 1, is provided.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: October 25, 2016
    Assignee: YANMAR CO., LTD.
    Inventors: Toru Takemoto, Ryoichi Hagiwara, Takahiro Kyakuno, Megumi Suzuki
  • Publication number: 20160252030
    Abstract: In an auxiliary chamber type gas engine including an ECU in which a fuel injection amount map for determining a command fuel injection amount from the engine rotation speed and an engine load, and a target air supply manifold pressure map for determining target air supply manifold pressure from the engine rotation speed and the engine load are set, the ECU makes a correction to decrease the target air supply manifold pressure of the target air supply manifold pressure map in a case where the fuel injection amount is required more than the command fuel injection amount determined with respect to the engine rotation speed and the engine load.
    Type: Application
    Filed: October 27, 2014
    Publication date: September 1, 2016
    Inventors: Ryoichi HAGIWARA, Osamu YAMAGISHI
  • Patent number: 9407070
    Abstract: An engine ignition system and the like are provided, which reduce a required voltage and improve an ignition performance without any special electrical configuration. An ignition system is configured so that: to an auxiliary electrode is applied a voltage that is not more than a voltage applied between a center electrode and a ground electrode and that generates no spark discharge; the auxiliary electrode is positioned so that an electric field Ef2 between the auxiliary electrode and the ground electrode or an electric field Ef3 between the auxiliary electrode and the center electrode, which is generated by the applied voltage, is spread over the gap. A time for applying the voltage to the auxiliary electrode is controlled to include a time for applying the voltage between the center electrode and the ground electrode.
    Type: Grant
    Filed: January 20, 2014
    Date of Patent: August 2, 2016
    Assignees: YANMAR CO., LTD., NAGOYA INSTITUTE OF TECHNOLOGY
    Inventors: Toru Takemoto, Kazuteru Toshinaga, Ryoichi Hagiwara, Masahiro Furutani
  • Publication number: 20160020583
    Abstract: An engine ignition system and the like are provided, which reduce a required voltage and improve an ignition performance without any special electrical configuration. An ignition system 3 is configured so that: to an auxiliary electrode 13 is applied a voltage that is not more than a voltage applied between a center electrode 11 and a ground electrode 12 and that generates no spark discharge; the auxiliary electrode 13 is positioned so that an electric field Ef2 between the auxiliary electrode 13 and the ground electrode 12 or an electric field Ef3 between the auxiliary electrode 13 and the center electrode 11, which is generated by the applied voltage, is spread over the gap. A time for applying the voltage to the auxiliary electrode 13 is controlled to include a time for applying the voltage between the center electrode 11 and the ground electrode 12.
    Type: Application
    Filed: January 20, 2014
    Publication date: January 21, 2016
    Inventors: Toru TAKEMOTO, Kazuteru TOSHINAGA, Ryoichi HAGIWARA, Masahiro FURUTANI