Patents by Inventor Hirofumi Tsuchida
Hirofumi Tsuchida 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: 12055108Abstract: A control method and a control device for controlling a spark-ignition internal combustion engine that is equipped with a turbocharger and an exhaust gas recirculation device. The operation of the engine is carried out to perform a stoichiometric air-fuel ratio by performing exhaust gas recirculation even in a high-load range including a maximum-output operation point. When the maximum output operation point is required, intake air information such as atmospheric pressure and outside air temperature is used as a basis to calculate intake air density, which is compared with a predetermined density threshold. When the intake density is equal to or less than the density threshold at a high-altitude location or the like, an exhaust gas recirculation rate is set to 0. As a result, the maximum output can be higher than when exhaust gas recirculation is performed.Type: GrantFiled: April 15, 2021Date of Patent: August 6, 2024Assignee: Nissan Motor Co., Ltd.Inventors: Katsuhito Takahashi, Hirofumi Tsuchida, Mitsuhiro Akagi
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Publication number: 20240183322Abstract: A control method and a control device for controlling a spark-ignition internal combustion engine that is equipped with a turbocharger and an exhaust gas recirculation device. The operation of the engine is carried out to perform a stoichiometric air-fuel ratio by performing exhaust gas recirculation even in a high-load range including a maximum-output operation point. When the maximum output operation point is required, intake air information such as atmospheric pressure and outside air temperature is used as a basis to calculate intake air density, which is compared with a predetermined density threshold. When the intake density is equal to or less than the density threshold at a high-altitude location or the like, an exhaust gas recirculation rate is set to 0. As a result, the maximum output can be higher than when exhaust gas recirculation is performed.Type: ApplicationFiled: April 15, 2021Publication date: June 6, 2024Inventors: Katsuhito TAKAHASHI, Hirofumi TSUCHIDA, Mitsuhiro AKAGI
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Patent number: 11939928Abstract: An EGR valve is provided in an EGR passage circulating a part of an exhaust gas of an exhaust pipe in an intake pipe as an EGR gas, the EGR valve adjusting an EGR gas amount flowing in the EGR passage when an engine is in an EGR region, a differential pressure device is provided in the intake pipe, the differential pressure device adjusting a differential pressure of the EGR valve, a control unit is provided to control the EGR valve and the differential pressure device, and the EGR control method includes switching whether to adjust the EGR gas amount using the EGR valve and the differential pressure device or to adjust the EGR gas amount using the EGR valve only on the basis of an exhaust gas pressure of an inlet portion of the EGR passage.Type: GrantFiled: September 6, 2019Date of Patent: March 26, 2024Assignee: NISSAN MOTOR CO., LTD.Inventors: Daisuke Takaki, Hirofumi Tsuchida, Takayuki Hamamoto
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Patent number: 11623180Abstract: A catalytic converter is provided with: an inlet-side diffuser part; an outlet-side diffuser part; a case including an upstream-side cylindrical part and a downstream-side cylindrical part; an inner liner provided in the upstream-side cylindrical part; a first catalyst retained inside the inner liner; and a second catalyst retained inside the downstream-side cylindrical part. An end face of the second catalyst faces a peripheral surface of the inner liner. An annular flow path is provided between the upstream-side cylindrical part and the inner liner, and the first catalyst is insulated from heat by the annular flow path. A part of exhaust flows into the second catalyst via the annular flow path.Type: GrantFiled: May 22, 2019Date of Patent: April 11, 2023Assignees: NISSAN MOTOR CO., LTD., RENAULT S. A. S.Inventors: Takayuki Hamamoto, Hirofumi Tsuchida, Daisuke Takaki, Yuta Ishigaki
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Publication number: 20230056691Abstract: A vehicle cooling device includes a first heat exchanger and a second heat exchanger. The first heat exchanger is a water-cooled intercooler that is configured to cool supercharged intake air. The second heat exchanger is a water-cooled EGR gas cooler that is configured to cool EGR gas. The first heat exchanger and the second heat exchanger are arranged in series on a cooling water circuit such that cooling water flowing out of the first heat exchanger flows into the second heat exchanger. The second heat exchanger is arranged in a position relatively lower than a height position of the first heat exchanger when the cooling device has been installed in a vehicle. Due to this height difference, the cooling water in the second heat exchanger has high pressure, and boiling of the cooling water is suppressed.Type: ApplicationFiled: January 23, 2020Publication date: February 23, 2023Inventors: Takayuki HAMAMOTO, Hirofumi TSUCHIDA
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Patent number: 11441497Abstract: During a transient period, the opening degree of a throttle valve (throttle opening degree) is varied from a steady-period target throttle opening degree in a region A1 toward a valve closing side by a predetermined amount ?P, and is thereafter controlled so as to become a steady-period target throttle opening degree in the region A1. The transient period is a transient period in which the operation state is shifted from a region B2 in which an air-fuel ratio in a supercharged state becomes a predetermined lean air-fuel ratio to a region A1 in which the air-fuel ratio in a non-supercharged state becomes a predetermined rich air-fuel ratio richer than the lean air-fuel ratio. In this transient period, by reducing the air amount in a cylinder, the combustion torque of an internal combustion engine is suppressed, and consequently; a torque overshoot can be suppressed.Type: GrantFiled: January 23, 2018Date of Patent: September 13, 2022Assignee: NISSAN MOTOR CO., LTD.Inventors: Kengo Yonekura, Hirofumi Tsuchida
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Publication number: 20220274060Abstract: A catalytic converter is provided with: an inlet-side diffuser part; an outlet-side diffuser part; a case including an upstream-side cylindrical part and a downstream-side cylindrical part; an inner liner provided in the upstream-side cylindrical part; a first catalyst retained inside the inner liner; and a second catalyst retained inside the downstream-side cylindrical part. An end face of the second catalyst faces a peripheral surface of the inner liner. An annular flow path is provided between the upstream-side cylindrical part and the inner liner, and the first catalyst is insulated from heat by the annular flow path. A part of exhaust flows into the second catalyst via the annular flow path.Type: ApplicationFiled: May 22, 2019Publication date: September 1, 2022Applicants: NISSAN MOTOR CO., LTD., RENAULT S.A.S.Inventors: Takayuki HAMAMOTO, Hirofumi TSUCHIDA, Daisuke TAKAKI, Yuta ISHIGAKI
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Publication number: 20220268222Abstract: An EGR valve is provided in an EGR passage circulating a part of an exhaust gas of an exhaust pipe in an intake pipe as an EGR gas, the EGR valve adjusting an EGR gas amount flowing in the EGR passage when an engine is in an EGR region, a differential pressure device is provided in the intake pipe, the differential pressure device adjusting a differential pressure of the EGR valve, a control unit is provided to control the EGR valve and the differential pressure device, and the EGR control method includes switching whether to adjust the EGR gas amount using the EGR valve and the differential pressure device or to adjust the EGR gas amount using the EGR valve only on the basis of an exhaust gas pressure of an inlet portion of the EGR passage.Type: ApplicationFiled: September 6, 2019Publication date: August 25, 2022Applicant: NISSAN MOTOR CO., LTD.Inventors: Daisuke TAKAKI, Hirofumi TSUCHIDA, Takayuki HAMAMOTO
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Patent number: 11378792Abstract: The optical system for a microscope includes an illumination lens group G11 and an objective optical system. The objective optical system has an objective lens group G12, a first image forming lens group G13, and a second image forming lens group G14, which are disposed in this order from the object side, and satisfies the following conditional expressions. NAL×2?NAO?NAL×15 . . . (1); 0.01?NAL?0.1 . . . (2); and 25?MO?100 . . . (3), where NAL denotes the numerical aperture of the illumination lens group G11, NAO denotes the numerical aperture of the objective lens group G12, and MO denotes the image-formation magnification of the objective lens group G12.Type: GrantFiled: June 21, 2017Date of Patent: July 5, 2022Assignee: MIL-KIN INC.Inventors: Kiyofumi Kano, Hirofumi Tsuchida, Kazuo Kajitani
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Publication number: 20210054794Abstract: During a transient period, the opening degree of a throttle valve (throttle opening degree) is varied from a steady-period target throttle opening degree in a region A1 toward a valve closing side by a predetermined amount ?P, and is thereafter controlled so as to become a steady-period target throttle opening degree in the region A1. The transient period is a transient period in which the operation state is shifted from a region B2 in which an air-fuel ratio in a supercharged state becomes a predetermined lean air-fuel ratio to a region A1 in which the air-fuel ratio in a non-supercharged state becomes a predetermined rich air-fuel ratio richer than the lean air-fuel ratio. In this transient period, by reducing the air amount in a cylinder, the combustion torque of an internal combustion engine is suppressed, and consequently; a torque overshoot can be suppressed.Type: ApplicationFiled: January 23, 2018Publication date: February 25, 2021Applicant: NISSAN MOTOR CO., LTD.Inventors: Kengo YONEKURA, Hirofumi TSUCHIDA
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Patent number: 10890126Abstract: A control method for an internal combustion engine including: setting a target valve opening degree of the first throttle valve in accordance with a load, sensing a valve opening degree of the second throttle valve, judging whether or not the valve opening degree of the second throttle valve is an opening degree on a closing side relative to a predetermined set valve opening degree, and correcting the valve opening degree of the first throttle valve to the opening degree on the closing side relative to the target valve opening degree when it is judged that the valve opening degree of the second throttle valve is the opening degree on the closing side relative to the predetermined set valve opening degree.Type: GrantFiled: January 16, 2017Date of Patent: January 12, 2021Assignees: NISSAN MOTOR CO., LTD., RENAULT S. A. S.Inventors: Takayuki Hamamoto, Hirofumi Tsuchida, Daisuke Suzuki
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Patent number: 10883429Abstract: An intake control method for an internal combustion engine equipped with a low-pressure EGR system includes setting a target intake pressure, which is a target value of an intake pressure in an intake passage between a negative pressure generating valve and an intake throttle valve, necessary for performing EGR control in a state of an exhaust pressure determined for each operating point, setting a target total opening area, which is a sum of a target opening area of an EGR valve and a target opening area of the negative pressure generating valve, on the basis of the target intake pressure, a target fresh air amount, and a target EGR gas amount, setting a target EGR valve opening area, which is an opening area of the EGR valve for achieving the target EGR gas amount, assuming that the negative pressure generating valve is fully open, and setting a value obtained by subtracting the target EGR valve opening area from the target total opening area to be a target negative pressure generating valve opening area, wType: GrantFiled: February 1, 2017Date of Patent: January 5, 2021Assignees: NISSAN MOTOR CO., LTD., RENAULT S.A.S.Inventors: Kengo Yonekura, Hirofumi Tsuchida, Takayuki Hamamoto
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Publication number: 20200379228Abstract: The optical system for a microscope includes an illumination lens group G11 and an objective optical system. The objective optical system has an objective lens group G12, a first image forming lens group G13, and a second image forming lens group G14, which are disposed in this order from the object side, and satisfies the following conditional expressions. NAL×2?NAO?NAL×15 . . . (1); 0.01?NAL?0.1 . . . (2); and 25?MO100 . . . (3), where NAL denotes the numerical aperture of the illumination lens group G11, NAO denotes the numerical aperture of the objective lens group G12, and MO denotes the image-formation magnification of the objective lens group G12.Type: ApplicationFiled: June 21, 2017Publication date: December 3, 2020Inventors: Kiyofumi Kano, Hirofumi Tsuchida, Kazuo Kajitani
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Publication number: 20190353109Abstract: A control method for an internal combustion engine including: setting a target valve opening degree of the first throttle valve in accordance with a load, sensing a valve opening degree of the second throttle valve, judging whether or not the valve opening degree of the second throttle valve is an opening degree on a closing side relative to a predetermined set valve opening degree, and correcting the valve opening degree of the first throttle valve to the opening degree on the closing side relative to the target valve opening degree when it is judged that the valve opening degree of the second throttle valve is the opening degree on the closing side relative to the predetermined set valve opening degree.Type: ApplicationFiled: January 16, 2017Publication date: November 21, 2019Applicants: NISSAN MOTOR CO., LTD., RENAULT S. A. S.Inventors: Takayuki HAMAMOTO, Hirofumi TSUCHIDA, Daisuke SUZUKI
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Patent number: 10465622Abstract: A basic opening (A0) of an EGR control valve (22) is set, based on a current engine operation state. A differential pressure (?P1) across the EGR control valve (22) is calculated, based on an actual exhaust system temperature (T1) sensed by an exhaust temperature sensor (33). A reference differential pressure (?P0) is calculated, which is a differential pressure across the EGR control valve (22) in a steady state corresponding to the current engine operation state. A reference pulsation amplitude (D) is calculated, which is an amplitude of pulsation of the reference differential pressure (?P0). The basic opening (A0) is corrected, based on the differential pressure (?P1), the reference differential pressure (?P0), and the reference pulsation amplitude (D).Type: GrantFiled: September 7, 2016Date of Patent: November 5, 2019Assignees: NISSAN MOTOR CO., LTD., RENAULT S.A.S.Inventors: Kengo Yonekura, Hirofumi Tsuchida, Takayuki Hamamoto
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Publication number: 20190331035Abstract: An intake control method for an internal combustion engine equipped with a low-pressure EGR system includes setting a target intake pressure, which is a target value of an intake pressure in an intake passage between a negative pressure generating valve and an intake throttle valve, necessary for performing EGR control in a state of an exhaust pressure determined for each operating point, setting a target total opening area, which is a sum of a target opening area of an EGR valve and a target opening area of the negative pressure generating valve, on the basis of the target intake pressure, a target fresh air amount, and a target EGR gas amount, setting a target EGR valve opening area, which is an opening area of the EGR valve for achieving the target EGR gas amount, assuming that the negative pressure generating valve is fully open, and setting a value obtained by subtracting the target EGR valve opening area from the target total opening area to be a target negative pressure generating valve opening area, wType: ApplicationFiled: February 1, 2017Publication date: October 31, 2019Applicants: NISSAN MOTOR CO., LTD., RENAULT S.A.S.Inventors: Kengo YONEKURA, Hirofumi TSUCHIDA, Takayuki HAMAMOTO
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Publication number: 20190234328Abstract: A basic opening (A0) of an EGR control valve (22) is set, based on a current engine operation state. A differential pressure (?P1) across the EGR control valve (22) is calculated, based on an actual exhaust system temperature (T1) sensed by an exhaust temperature sensor (33). A reference differential pressure (?P0) is calculated, which is a differential pressure across the EGR control valve (22) in a steady state corresponding to the current engine operation state. A reference pulsation amplitude (D) is calculated, which is an amplitude of pulsation of the reference differential pressure (?P0). The basic opening (A0) is corrected, based on the differential pressure (?P1), the reference differential pressure (?P0), and the reference pulsation amplitude (D).Type: ApplicationFiled: September 7, 2016Publication date: August 1, 2019Applicants: NISSAN MOTOR CO., LTD., RENAULT S. A. S.Inventors: Kengo YONEKURA, Hirofumi TSUCHIDA, Takayuki HAMAMOTO
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Patent number: 10100759Abstract: An exhaust gas recirculation control device controls an exhaust gas recirculation device that includes an exhaust gas recirculation passage adapted to circulate a portion of exhaust gas of an internal combustion engine from an exhaust passage downstream of a turbine of a turbo supercharger along an exhaust flow to an intake passage upstream of a compressor of the turbo supercharger along an intake flow and downstream of an air flow meter along the intake flow, and a recirculation control valve adapted to adjust an amount of exhaust gas circulated to the intake passage. Furthermore, the exhaust gas recirculation control device includes recirculation ratio setting means adapted to set a lower target recirculation ratio for a smaller intake air amount of the internal combustion engine.Type: GrantFiled: April 25, 2014Date of Patent: October 16, 2018Assignee: NISSAN MOTOR CO., LTD.Inventors: Daisuke Takaki, Hirofumi Tsuchida, Kazuhiko Sugawara
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Patent number: 9970368Abstract: An EGR control device includes an estimate EGR ratio calculating portion adapted to calculate an estimate EGR ratio from a fresh air flow amount at a joining portion with the EGR passage of an intake passage and an EGR gas amount passing through the EGR valve, and a joining portion EGR ratio estimating portion adapted to correct an estimate EGR ratio on the basis of a gaseous state inside the introduction passage when the EGR valve switches from a closed state to an open state, to calculate a joining portion EGR ratio being a proportion of an EGR gas amount with respect to fresh air in the joining portion.Type: GrantFiled: May 21, 2014Date of Patent: May 15, 2018Assignee: NISSAN MOTOR CO., LTD.Inventors: Daisuke Takaki, Hirofumi Tsuchida, Kazuhiko Sugawara, Kenji Suzuki, Takayuki Sui
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Patent number: 9964055Abstract: In a case where a driving state is switched from a high load to a low load in a non-turbo charge region and an external EGR is stopped, at a timing T01 at which an EGR control valve (21) is closed, a valve overlap quantity between an intake valve and an exhaust valve is, as a low load transient time provisional value, controlled in a direction such that the valve overlap between the intake and exhaust valves is once contracted. Then, a target value of the valve overlap quantity between the intake and exhaust valves at a timing T21 preceded by a response time ?t of the variably operated valve mechanism (28) from a timing T31 at which the opening angle of the EGR control valve (21) is modified from the low load transient time provisional value to the target value at the time of the low load.Type: GrantFiled: June 10, 2013Date of Patent: May 8, 2018Assignee: NISSAN MOTOR CO., LTD.Inventors: Mitsuhiro Akagi, Hirofumi Tsuchida, Ayumi Komiya