Patents by Inventor Tatsuya Fujikawa
Tatsuya Fujikawa 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: 11835001Abstract: A control system for an engine including intake and exhaust valve phase variable devices and a control device is provided. At an engine temperature below a first determination temperature, the control is performed so that an exhaust valve close timing is at or retarded from the exhaust top dead center, an intake valve open timing is retarded from the exhaust valve close timing, and the fuel supply to the combustion chamber starts in an intake stroke on a retarding side of the exhaust valve close timing. At the engine temperature above the first determination temperature and below a second determination temperature, the control is performed so that a negative overlap with both the exhaust and intake valves closed during a period including the exhaust top dead center, or a positive overlap with both the exhaust and intake valves opened during a period including the exhaust top dead center, occurs.Type: GrantFiled: March 23, 2023Date of Patent: December 5, 2023Assignee: Mazda Motor CorporationInventors: Takeaki Kudo, Junki Hori, Masatoshi Seto, Tatsuya Fujikawa, Masahisa Yamakawa
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Publication number: 20230383702Abstract: A control system for an engine including intake and exhaust valve phase variable devices and a control device is provided. At an engine temperature below a first determination temperature, the control is performed so that an exhaust valve close timing is at or retarded from the exhaust top dead center, an intake valve open timing is retarded from the exhaust valve close timing, and the fuel supply to the combustion chamber starts in an intake stroke on a retarding side of the exhaust valve close timing. At the engine temperature above the first determination temperature and below a second determination temperature, the control is performed so that a negative overlap with both the exhaust and intake valves closed during a period including the exhaust top dead center, or a positive overlap with both the exhaust and intake valves opened during a period including the exhaust top dead center, occurs.Type: ApplicationFiled: March 23, 2023Publication date: November 30, 2023Inventors: Takeaki Kudo, Junki Hori, Masatoshi Seto, Tatsuya Fujikawa, Masahisa Yamakawa
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Patent number: 11591983Abstract: An engine system is provided, including a controller which controls devices of an engine at a given engine speed so that, when a demanded engine load is a first load, a mass ratio (G/F) of intake air inside a cylinder (containing fresh air and burnt gas) to fuel is a first G/F and mixture gas inside the cylinder combusts by flame-propagation, when the demanded load is a second load (<the first load), the G/F is a second G/F (>the first G/F) and an injection center-of-gravity is at a timing such that the entire mixture gas combusts by CI combustion, and when the demanded load is between the first and second loads, the G/F is at a third G/F (between the first and second G/Fs) and the injection center-of-gravity is at a later timing such that at least part of the mixture gas combusts by the CI combustion.Type: GrantFiled: October 27, 2021Date of Patent: February 28, 2023Assignee: Mazda Motor CorporationInventors: Takashi Kaminaga, Tatsuya Fujikawa, Masahisa Yamakawa, Naoya Ito, Ryohei Matsuo, Yuta Sasaki, Junki Hori, Mitsuhiro Muto, Takuma Fujii
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Patent number: 11542886Abstract: An engine system is provided, including a controller which estimates an intake-valve-closing temperature inside a cylinder. When an engine operates at a given speed and a demanded engine load is a first load or a second load (>the first load), the controller controls so that a mixture gas inside the cylinder combusts by compression ignition, and controls so that, at the first load, the entire mixture gas combusts by compression ignition when the intake-valve-closing temperature is above a first temperature, and at least part of the mixture gas combusts by flame propagation when the intake-valve-closing temperature is below the first temperature, whereas at the second load, the entire mixture gas combusts by compression ignition when the intake-valve-closing temperature is above a second temperature (<the first temperature), and at least part of the mixture gas combusts by flame propagation when the intake-valve-closing temperature is below the second temperature.Type: GrantFiled: October 29, 2021Date of Patent: January 3, 2023Assignee: Mazda Motor CorporationInventors: Takashi Kaminaga, Tatsuya Fujikawa, Masahisa Yamakawa, Naoya Ito, Ryohei Matsuo, Yuta Sasaki, Junki Hori, Mitsuhiro Muto, Takuma Fujii
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Patent number: 11391235Abstract: An engine system is provided, including a controller which estimates a mass ratio (G/F) of intake air inside a cylinder (containing fresh air and burnt gas) to fuel, and controls devices of an engine at a given engine speed so that, while a demanded engine load is a first load, at least part of a mixture gas inside the cylinder combusts by flame-propagation when the estimated G/F is below a first G/F, and the entire mixture gas combusts by compression ignition when the estimated G/F is above the first G/F, whereas while the demanded load is a second load (>the first load), at least part of the mixture gas combusts by flame-propagation when the estimated G/F is below a second G/F (<the first G/F), and the entire mixture gas combusts by compression ignition when the estimated G/F is above the second G/F.Type: GrantFiled: October 28, 2021Date of Patent: July 19, 2022Assignee: Mazda Motor CorporationInventors: Takashi Kaminaga, Tatsuya Fujikawa, Masahisa Yamakawa, Naoya Ito, Ryohei Matsuo, Yuta Sasaki, Junki Hori, Mitsuhiro Muto, Takuma Fujii
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Publication number: 20220154666Abstract: An engine system is provided, including a controller which estimates an intake-valve-closing temperature inside a cylinder. When an engine operates at a given speed and a demanded engine load is a first load or a second load (>the first load), the controller controls so that a mixture gas inside the cylinder combusts by compression ignition, and controls so that, at the first load, the entire mixture gas combusts by compression ignition when the intake-valve-closing temperature is above a first temperature, and at least part of the mixture gas combusts by flame propagation when the intake-valve-closing temperature is below the first temperature, whereas at the second load, the entire mixture gas combusts by compression ignition when the intake-valve-closing temperature is above a second temperature (<the first temperature), and at least part of the mixture gas combusts by flame propagation when the intake-valve-closing temperature is below the second temperature.Type: ApplicationFiled: October 29, 2021Publication date: May 19, 2022Inventors: Takashi Kaminaga, Tatsuya Fujikawa, Masahisa Yamakawa, Naoya Ito, Ryohei Matsuo, Yuta Sasaki, Junki Hori, Mitsuhiro Muto, Takuma Fujii
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Publication number: 20220154664Abstract: An engine system is provided, including a controller which controls devices of an engine at a given engine speed so that, when a demanded engine load is a first load, a mass ratio (G/F) of intake air inside a cylinder (containing fresh air and burnt gas) to fuel is a first G/F and mixture gas inside the cylinder combusts by flame-propagation, when the demanded load is a second load (<the first load), the G/F is a second G/F (>the first G/F) and an injection center-of-gravity is at a timing such that the entire mixture gas combusts by CI combustion, and when the demanded load is between the first and second loads, the G/F is at a third G/F (between the first and second G/Fs) and the injection center-of-gravity is at a later timing such that at least part of the mixture gas combusts by the CI combustion.Type: ApplicationFiled: October 27, 2021Publication date: May 19, 2022Inventors: Takashi Kaminaga, Tatsuya Fujikawa, Masahisa Yamakawa, Naoya Ito, Ryohei Matsuo, Yuta Sasaki, Junki Hori, Mitsuhiro Muto, Takuma Fujii
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Publication number: 20220154663Abstract: An engine system is provided, including a controller which estimates a mass ratio (G/F) of intake air inside a cylinder (containing fresh air and burnt gas) to fuel, and controls devices of an engine at a given engine speed so that, while a demanded engine load is a first load, at least part of a mixture gas inside the cylinder combusts by flame-propagation when the estimated G/F is below a first G/F, and the entire mixture gas combusts by compression ignition when the estimated G/F is above the first G/F, whereas while the demanded load is a second load (>the first load), at least part of the mixture gas combusts by flame-propagation when the estimated G/F is below a second G/F (<the first G/F), and the entire mixture gas combusts by compression ignition when the estimated G/F is above the second G/F.Type: ApplicationFiled: October 28, 2021Publication date: May 19, 2022Inventors: Takashi Kaminaga, Tatsuya Fujikawa, Masahisa Yamakawa, Naoya Ito, Ryohei Matsuo, Yuta Sasaki, Junki Hori, Mitsuhiro Muto, Takuma Fujii
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Patent number: 11092108Abstract: A control device for a compression self-ignition engine includes a fuel injection system and an injection controller. While the engine is operated by CI combustion under a given first condition, a first injection is carried out in which fuel is injected at a first timing in a compression stroke and at which the fuel goes toward a part radially outward of a cavity formed in a crown surface of a piston, and a second injection is suspended. While the engine is operated by the CI combustion under a second condition in which a temperature inside a combustion chamber at a close timing of an intake valve becomes lower than the first condition, at least the second injection is carried out in which the fuel is injected at a second timing later than the first timing in the compression stroke and at which the fuel goes toward the cavity.Type: GrantFiled: October 19, 2020Date of Patent: August 17, 2021Assignee: Mazda Motor CorporationInventors: Naoya Ito, Takashi Kaminaga, Kenji Uchida, Tatsuya Fujikawa, Takashi Youso, Masahisa Yamakawa, Mitsuhiro Muto, Takuma Fujii
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Publication number: 20210172397Abstract: A control device for a compression self-ignition engine includes a fuel injection system and an injection controller. While the engine is operated by CI combustion under a given first condition, a first injection is carried out in which fuel is injected at a first timing in a compression stroke and at which the fuel goes toward a part radially outward of a cavity formed in a crown surface of a piston, and a second injection is suspended. While the engine is operated by the CI combustion under a second condition in which a temperature inside a combustion chamber at a close timing of an intake valve becomes lower than the first condition, at least the second injection is carried out in which the fuel is injected at a second timing later than the first timing in the compression stroke and at which the fuel goes toward the cavity.Type: ApplicationFiled: October 19, 2020Publication date: June 10, 2021Inventors: Naoya Ito, Takashi Kaminaga, Kenji Uchida, Tatsuya Fujikawa, Takashi Youso, Masahisa Yamakawa, Mitsuhiro Muto, Takuma Fujii
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Patent number: 10309294Abstract: An engine includes: a piston including a cavity; a cylinder head configured so as to form a combustion chamber having a pent roof shape; a fuel injection valve configured to inject fuel from a second half of a compression stroke until a first half of an expansion stroke; and a spark plug arranged at a position corresponding to an upper side of the cavity. Injection openings which are arranged in a circumferential direction surrounding a longitudinal axis of the valve and through each of which the fuel is injected in a direction inclined relative to the longitudinal axis by a predetermined angle is formed such that when a height of a ceiling of the combustion chamber at a position corresponding to an edge end portion of the cavity in an injection direction of the injection opening is large, the injection angle of the injection opening is large.Type: GrantFiled: September 23, 2016Date of Patent: June 4, 2019Assignees: MAZDA MOTOR CORPORATION, DENSO CORPORATIONInventors: Takayuki Hikita, Masahisa Yamakawa, Tomonori Urushihara, Kazuhiro Nagatsu, Tatsuya Fujikawa, Takashi Youso, Takaaki Nagano, Yuuki Kawai, Toshifumi Hayami
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Patent number: 10280831Abstract: An engine includes: a piston including a cavity; a cylinder head configured to form a combustion chamber having a pent roof shape; a fuel injection valve configured to inject fuel from a second half of a compression stroke until a first half of an expansion stroke; and a spark plug arranged at a position corresponding to an upper side of the cavity. Injection openings are arranged in a circumferential direction surrounding a longitudinal axis of the valve. The combustion chamber at a compression top dead center is divided into a plurality of fuel injection regions, located in respective injection directions of the injection openings, by vertical surfaces extending radially from the longitudinal axis through a middle between adjacent injection openings. When a volume of the fuel injection region located in the injection direction of the injection opening is large, an opening area of the injection opening is large.Type: GrantFiled: September 23, 2016Date of Patent: May 7, 2019Assignee: Mazda Motor CorporationInventors: Takayuki Hikita, Masahisa Yamakawa, Tomonori Urushihara, Kazuhiro Nagatsu, Tatsuya Fujikawa, Takashi Youso, Takaaki Nagano, Yuuki Kawai, Toshifumi Hayami
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Publication number: 20180258884Abstract: An engine includes: a piston including a cavity; a cylinder head configured so as to form a combustion chamber having a pent roof shape; a fuel injection valve configured to inject fuel in a period from a second half of a compression stroke until a first half of an expansion stroke; and a spark plug arranged at a position corresponding to an upper side of the cavity. Injection openings which are arranged in a circumferential direction surrounding a longitudinal axis of the valve and through each of which the fuel is injected in a direction inclined relative to the longitudinal axis by a predetermined angle is formed such that when a height of a ceiling of the combustion chamber at a position corresponding to an edge end portion of the cavity in an injection direction of the injection opening is large, the injection angle of the injection opening is large.Type: ApplicationFiled: September 23, 2016Publication date: September 13, 2018Inventors: Takayuki Hikita, Masahisa Yamakawa, Tomonori Urushihara, Kazuhiro Nagatsu, Tatsuya Fujikawa, Takashi Youso, Takaaki Nagano, Yuuki Kawai, Toshifumi Hayami
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Publication number: 20180252151Abstract: An engine includes: a piston including a cavity; a cylinder head configured to form a combustion chamber having a pent roof shape; a fuel injection valve configured to inject fuel from a second half of a compression stroke until a first half of an expansion stroke; and a spark plug arranged at a position corresponding to an upper side of the cavity. Injection openings are arranged in a circumferential direction surrounding a longitudinal axis of the valve. The combustion chamber at a compression top dead center is divided into a plurality of fuel injection regions, located in respective injection directions of the injection openings, by vertical surfaces extending radially from the longitudinal axis through a middle between adjacent injection openings. When a volume of the fuel injection region located in the injection direction of the injection opening is large, an opening area of the injection opening is large.Type: ApplicationFiled: September 23, 2016Publication date: September 6, 2018Inventors: Takayuki Hikita, Masahisa Yamakawa, Tomonori Urushihara, Kazuhiro Nagatsu, Tatsuya Fujikawa, Takashi Youso, Takaaki Nagano, Yuuki Kawai, Toshifumi Hayami
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Patent number: 10041464Abstract: A controller of a laser ignition engine configured to perform ignition by using a laser ignition device configured to emit a laser beam condensed by a lens includes: a combustion state related value acquiring portion configured to acquire a combustion state related value related to a combustion state of the engine; and a contamination determining portion configured to compare the combustion state related value acquired by the combustion state related value acquiring portion with a combustion state determining value to determine whether or not the laser ignition device is contaminated, the combustion state determining value being defined based on the combustion state of the engine when the laser ignition device is not contaminated.Type: GrantFiled: June 24, 2015Date of Patent: August 7, 2018Assignee: Mazda Motor CorporationInventors: Takashi Youso, Masahisa Yamakawa, Tatsuya Fujikawa, Atsushi Inoue
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Patent number: 10012134Abstract: Injection of the fuel by the injector 43 creates a gas flow in the combustion chamber. The gas expands in a radial fashion from an axis of a cylinder toward a radial outside of the cylinder, and then flows from the radial outside along the cylinder head bottom face 221 toward the axis of the cylinder. The spark plug 41 has a gap positioned away from the axis of the cylinder toward the radial outside of the cylinder at a predetermined distance, and placed radially inwardly from a position opposite a rim of an opening of the cavity 242. A side electrode extends to be oriented in a direction perpendicular to the flow of the gas along the cylinder head bottom face. The gap has a center positioned near the cylinder head bottom face, and closer to an interior of a combustion chamber than to the cylinder head bottom face.Type: GrantFiled: November 28, 2016Date of Patent: July 3, 2018Assignee: MAZDA MOTOR CORPORATIONInventors: Mitsunori Wasada, Tsuyoshi Yamamoto, Yasushi Nakahara, Takashi Youso, Hiroaki Abe, Takaaki Nagano, Atsushi Inoue, Kazuhiro Nagatsu, Takashi Kaminaga, Tatsuya Fujikawa
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Publication number: 20170167360Abstract: Injection of the fuel by the injector 43 creates a gas flow in the combustion chamber. The gas expands in a radial fashion from an axis of a cylinder toward a radial outside of the cylinder, and then flows from the radial outside along the cylinder head bottom face 221 toward the axis of the cylinder. The spark plug 41 has a gap positioned away from the axis of the cylinder toward the radial outside of the cylinder at a predetermined distance, and placed radially inwardly from a position opposite a rim of an opening of the cavity 242. A side electrode extends to be oriented in a direction perpendicular to the flow of the gas along the cylinder head bottom face. The gap has a center positioned near the cylinder head bottom face, and closer to an interior of a combustion chamber than to the cylinder head bottom face.Type: ApplicationFiled: November 28, 2016Publication date: June 15, 2017Applicant: MAZDA MOTOR CORPORATIONInventors: Mitsunori WASADA, Tsuyoshi YAMAMOTO, Yasushi NAKAHARA, Takashi YOUSO, Hiroaki ABE, Takaaki NAGANO, Atsushi INOUE, Kazuhiro NAGATSU, Takashi KAMINAGA, Tatsuya FUJIKAWA
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Publication number: 20170159635Abstract: A controller of a laser ignition engine configured to perform ignition by using a laser ignition device configured to emit a laser beam condensed by a lens includes: a combustion state related value acquiring portion configured to acquire a combustion state related value related to a combustion state of the engine; and a contamination determining portion configured to compare the combustion state related value acquired by the combustion state related value acquiring portion with a combustion state determining value to determine whether or not the laser ignition device is contaminated, the combustion state determining value being defined based on the combustion state of the engine when the laser ignition device is not contaminated.Type: ApplicationFiled: June 24, 2015Publication date: June 8, 2017Inventors: Takashi Youso, Masahisa Yamakawa, Tatsuya Fujikawa, Atsushi Inoue
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Patent number: 9470174Abstract: An engine body includes a cylinder with a geometrical compression ratio of 15 or higher, and is supplied with fuel containing at least gasoline. When an operating mode of the engine body is in a high load range, a controller (i.e., a PCM 10) drives a fuel injection valve (i.e., an injector) 67 to inject the fuel at a time within a retarded period between a terminal stage of a compression stroke and an initial stage of an expansion stroke in a low speed range. The controller drives the fuel injection valve to inject the fuel in an intake stroke until an intake valve 21 is closed in a high-load high-speed range.Type: GrantFiled: November 8, 2012Date of Patent: October 18, 2016Assignee: MAZDA MOTOR CORPORATIONInventors: Kouhei Iwai, Masahisa Yamakawa, Takashi Youso, Tatsuya Fujikawa, Tatsuya Koga
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Publication number: 20160201551Abstract: A combustion chamber structure for an engine is provided. The structure includes a piston formed with a downward dented cavity in a central part of an upper surface thereof, and a cylinder head forming a combustion chamber having a pent-roof shape. The upper surface of the piston has an annular part extending from an outer edge of the cavity to an outer edge of the upper surface, and surrounding the outer edge of the cavity. The annular part is formed with first and second piston upper surface portions. When the piston is at a top dead center, a ratio of a volume of a space formed between the first piston upper surface portion and a bottom surface of the cylinder head with respect to a volume of a space formed between the second piston upper surface portion and the bottom surface becomes below a predetermined value.Type: ApplicationFiled: December 28, 2015Publication date: July 14, 2016Inventors: Kenji Uchida, Tatsuya Fujikawa, Masahisa Yamakawa, Daisuke Asaji, Kazuhiro Nagatsu, Takashi Kaminaga, Toru Miyamoto, Takashi Youso, Hiroaki Abe