Patents by Inventor Hiroi Nagasawa
Hiroi Nagasawa 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: 11560137Abstract: A control device of a powertrain system executes a control input determination processing and a system control processing. The control input determination processing includes a co-state variable determination processing to update a co-state variable p of an optimization problem for each time step and a control input calculation processing. The co-state variable determination processing includes an initial value determination processing that determines, as an initial value of the co-state variable p, the sum of a base value of the initial value and an external charge/discharge correction value. The base value is a final value or an average value of the co-state variable p during the last control time period. The external charge/discharge correction value is determined based on an external charge/discharge amount obtained by subtracting a SOC at the end of the last control time period from the SOC at the start of the current control time period.Type: GrantFiled: December 17, 2020Date of Patent: January 24, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroi Nagasawa, Yushi Shibaike
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Patent number: 11292450Abstract: A powertrain system includes an internal combustion engine, an electric motor, a battery and a control device. The control device is configured to: execute a control input determination processing to solve an optimization problem that minimizes a fuel consumption amount mf during the control time period while taking dynamics of a charging rate SOC as a constraint, and thereby calculate one or more control input values; and execute a system control processing. The control input determination processing includes: a co-state variable determination processing to update a co-state variable p for each time step while using, as an initial value thereof, a final value or an average value thereof during the last control time period; and a control input calculation processing to use the determined co-state variable p and search for and calculate, for each time step, the one or more control input values that minimize an Hamiltonian H.Type: GrantFiled: November 20, 2019Date of Patent: April 5, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroi Nagasawa, Yushi Shibaike
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Publication number: 20210188245Abstract: A control device of a powertrain system executes a control input determination processing and a system control processing. The control input determination processing includes a co-state variable determination processing to update a co-state variable p of an optimization problem for each time step and a control input calculation processing. The co-state variable determination processing includes an initial value determination processing that determines, as an initial value of the co-state variable p, the sum of a base value of the initial value and an external charge/discharge correction value. The base value is a final value or an average value of the co-state variable p during the last control time period. The external charge/discharge correction value is determined based on an external charge/discharge amount obtained by subtracting a SOC at the end of the last control time period from the SOC at the start of the current control time period.Type: ApplicationFiled: December 17, 2020Publication date: June 24, 2021Inventors: Hiroi Nagasawa, Yushi Shibaike
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Publication number: 20200198618Abstract: A powertrain system includes an internal combustion engine, an electric motor, a battery and a control device. The control device is configured to: execute a control input determination processing to solve an optimization problem that minimizes a fuel consumption amount mf during the control time period while taking dynamics of a charging rate SOC as a constraint, and thereby calculate one or more control input values; and execute a system control processing. The control input determination processing includes: a co-state variable determination processing to update a co-state variable p for each time step while using, as an initial value thereof, a final value or an average value thereof during the last control time period; and a control input calculation processing to use the determined co-state variable p and search for and calculate, for each time step, the one or more control input values that minimize an Hamiltonian H.Type: ApplicationFiled: November 20, 2019Publication date: June 25, 2020Inventors: Hiroi Nagasawa, Yushi Shibaike
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Patent number: 9890733Abstract: A control device is configured to calculate a basic accelerator request torque based on an accelerator opening degree detected by an accelerator opening degree sensor, and calculate a target acceleration increase amount based on relations between the target acceleration increase amount and an accelerator opening degree increase amount. Further, the control device is configured to calculate a torque increase amount correction amount based on the target acceleration increase amount, calculate a request engine torque based on the basic accelerator request torque and the torque increase amount correction amount, calculate a request injection amount based on the request engine torque, and control a fuel injection valve based on the request injection amount. The relations are such that as a present operating state is close to a constraint, a ratio of the target acceleration increase amount and the accelerator opening degree increase amount becomes smaller.Type: GrantFiled: October 25, 2016Date of Patent: February 13, 2018Assignee: Toyota Jidosha Kabushiki KaishaInventor: Hiroi Nagasawa
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Publication number: 20170167425Abstract: A control device is configured to calculate a basic accelerator request torque based on an accelerator opening degree detected by an accelerator opening degree sensor, and calculate a target acceleration increase amount based on relations between the target acceleration increase amount and an accelerator opening degree increase amount. Further, the control device is configured to calculate a torque increase amount correction amount based on the target acceleration increase amount, calculate a request engine torque based on the basic accelerator request torque and the torque increase amount correction amount, calculate a request injection amount based on the request engine torque, and control a fuel injection valve based on the request injection amount. The relations are such that as a present operating state is close to a constraint, a ratio of the target acceleration increase amount and the accelerator opening degree increase amount becomes smaller.Type: ApplicationFiled: October 25, 2016Publication date: June 15, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hiroi NAGASAWA
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Patent number: 9644572Abstract: This invention relates to a control device for internal combustion engine for performing an exhaust recirculation control for controlling an operation condition of an exhaust recirculation device (50,52) according to a target exhaust gas recirculation amount (TRegr) set such that a detected air-fuel ratio (AFd) corresponds to an estimated air-fuel ratio (AFe).Type: GrantFiled: June 20, 2011Date of Patent: May 9, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hiroi Nagasawa
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Publication number: 20140090627Abstract: This invention relates to a control device for internal combustion engine for performing an exhaust recirculation control for controlling an operation condition of an exhaust recirculation device (50,52) according to a target exhaust gas recirculation amount (TRegr) set such that a detected air-fuel ratio (AFd) corresponds to an estimated air-fuel ratio (AFe).Type: ApplicationFiled: June 20, 2011Publication date: April 3, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hiroi Nagasawa