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).
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Patent number: 11428177Abstract: 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: GrantFiled: July 30, 2021Date of Patent: August 30, 2022Assignee: YANMAR POWER TECHNOLOGY CO., LTD.Inventors: Ryoichi Hagiwara, Kazuteru Toshinaga, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
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Publication number: 20210355886Abstract: 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: ApplicationFiled: July 30, 2021Publication date: November 18, 2021Inventors: Ryoichi HAGIWARA, Kazuteru TOSHINAGA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
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Patent number: 11111866Abstract: 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: GrantFiled: May 27, 2020Date of Patent: September 7, 2021Assignee: YANMAR POWER TECHNOLOGY CO., LTD.Inventors: Ryoichi Hagiwara, Kazuteru Toshinaga, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
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Publication number: 20200284213Abstract: 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: ApplicationFiled: May 27, 2020Publication date: September 10, 2020Inventors: Ryoichi HAGIWARA, Kazuteru TOSHINAGA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
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Patent number: 10690069Abstract: 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: GrantFiled: May 24, 2016Date of Patent: June 23, 2020Assignee: YANMAR CO., LTD.Inventors: Ryoichi Hagiwara, Kazuteru Toshinaga, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
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Patent number: 10393035Abstract: 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: GrantFiled: May 24, 2016Date of Patent: August 27, 2019Assignee: YANMAR CO., LTD.Inventors: Ryoichi Hagiwara, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
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Patent number: 10378461Abstract: 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: GrantFiled: May 24, 2016Date of Patent: August 13, 2019Assignee: YANMAR CO., LTD.Inventors: Ryoichi Hagiwara, Masayoshi Doi, Taishi Murakami, Tatsuro Ohsara, Osamu Yamagishi
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Patent number: 10267254Abstract: 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: GrantFiled: May 24, 2016Date of Patent: April 23, 2019Assignee: YANMAR CO., LTD.Inventors: Ryoichi Hagiwara, Osamu Yamagishi, Naoya Ikeda
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Publication number: 20190085773Abstract: 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: ApplicationFiled: May 24, 2016Publication date: March 21, 2019Applicant: Yanmar Co., Ltd.Inventors: Ryoichi HAGIWARA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
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Patent number: 10221796Abstract: 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: GrantFiled: May 24, 2016Date of Patent: March 5, 2019Assignee: Yanmar Co., Ltd.Inventors: Ryoichi Hagiwara, Osamu Yamagishi, Naoya Ikeda
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Publication number: 20180298840Abstract: 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: ApplicationFiled: May 24, 2016Publication date: October 18, 2018Applicant: Yanmar Co., Ltd.Inventors: Ryoichi HAGIWARA, Osamu YAMAGISHI, Naoya IKEDA
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Patent number: 10094309Abstract: 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: GrantFiled: August 26, 2016Date of Patent: October 9, 2018Assignee: Yanmar Co., Ltd.Inventors: Ryoichi Hagiwara, Osamu Yamagishi
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Publication number: 20180258868Abstract: 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: ApplicationFiled: May 24, 2016Publication date: September 13, 2018Applicant: Yanmar Co., Ltd.Inventors: Ryoichi HAGIWARA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
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Publication number: 20180252174Abstract: 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: ApplicationFiled: May 24, 2016Publication date: September 6, 2018Applicant: Yanmar Co., Ltd.Inventors: Ryoichi HAGIWARA, Kazuteru TOSHINAGA, Masayoshi DOI, Taishi MURAKAMI, Tatsuro OHSARA, Osamu YAMAGISHI
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Publication number: 20180216559Abstract: 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: ApplicationFiled: May 24, 2016Publication date: August 2, 2018Applicant: Yanmar Co., Ltd.Inventors: Ryoichi HAGIWARA, Osamu YAMAGISHI, Naoya IKEDA
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Publication number: 20160363065Abstract: 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: ApplicationFiled: August 26, 2016Publication date: December 15, 2016Inventors: Ryoichi HAGIWARA, Osamu YAMAGISHI
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Patent number: 9476620Abstract: 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: GrantFiled: January 20, 2012Date of Patent: October 25, 2016Assignee: YANMAR CO., LTD.Inventors: Toru Takemoto, Ryoichi Hagiwara, Takahiro Kyakuno, Megumi Suzuki
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Publication number: 20160252030Abstract: 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: ApplicationFiled: October 27, 2014Publication date: September 1, 2016Inventors: Ryoichi HAGIWARA, Osamu YAMAGISHI
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Patent number: 9407070Abstract: 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: GrantFiled: January 20, 2014Date of Patent: August 2, 2016Assignees: YANMAR CO., LTD., NAGOYA INSTITUTE OF TECHNOLOGYInventors: Toru Takemoto, Kazuteru Toshinaga, Ryoichi Hagiwara, Masahiro Furutani
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Publication number: 20160020583Abstract: 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: ApplicationFiled: January 20, 2014Publication date: January 21, 2016Inventors: Toru TAKEMOTO, Kazuteru TOSHINAGA, Ryoichi HAGIWARA, Masahiro FURUTANI