Patents by Inventor Noriyuki Ota

Noriyuki Ota 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: 10968859
    Abstract: Control is performed so as to occur SPCCI combustion in which, after an air-fuel mixture in a first area of a combustion chamber that includes an electrode portion of an ignition device is burned by receiving ignition energy, an air-fuel mixture formed in a second area located on an outer periphery of the first area is self-ignited. Control is also performed such that, in a high load operation region of an SPCCI combustion execution region, an air-fuel ratio in the entire combustion chamber becomes richer than a stoichiometric air-fuel ratio and that an air-fuel ratio of the air-fuel mixture in the first area becomes leaner than an air-fuel ratio of the air-fuel mixture in the second area.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: April 6, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Noriyuki Ota, Ryohei Ono
  • Patent number: 10480438
    Abstract: Disclosed herein is a fuel injection control device for a direct injection engine including an engine body (engine 1) and a fuel injection control unit (engine controller 100). The fuel injection control unit injects a fuel in a predetermined injection mode into a combustion chamber (17) such that while the engine body is warm, an air-fuel mixture layer and a heat-insulating gas layer, surrounding the air-fuel mixture layer, are formed in the combustion chamber at a point in time when an air-fuel mixture ignites, and changes the injection mode of the fuel into the combustion chamber such that while the engine body is cold, the lower the temperature of the engine body is, the thinner the heat-insulating gas layer becomes.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: November 19, 2019
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Takeshi Nagasawa, Keiji Araki, Noriyuki Ota, Kenji Uchida, Ryohei Ono, Kiyotaka Sato, Hidefumi Fujimoto
  • Publication number: 20190345890
    Abstract: Control is performed so as to occur SPCCI combustion in which, after an air-fuel mixture in a first area of a combustion chamber that includes an electrode portion of an ignition device is burned by receiving ignition energy, an air-fuel mixture formed in a second area located on an outer periphery of the first area is self-ignited. Control is also performed such that, in a high load operation region of an SPCCI combustion execution region, an air-fuel ratio in the entire combustion chamber becomes richer than a stoichiometric air-fuel ratio and that an air-fuel ratio of the air-fuel mixture in the first area becomes leaner than an air-fuel ratio of the air-fuel mixture in the second area.
    Type: Application
    Filed: November 22, 2017
    Publication date: November 14, 2019
    Inventors: Noriyuki Ota, Ryohei Ono
  • Patent number: 10309338
    Abstract: A fuel injection valve (6) is configured such that the effective opening area of an injection port (61) increases as its lift amount increases. A fuel injection control unit (an engine control unit 100) injects fuel in a lift amount changing mode wherein, when fuel is injected into a combustion chamber (17) in the terminal period of the compression stroke, the lift amount of the fuel injection valve is set to a predetermined large lift amount in the earlier period of the injection period, and in the later period of the injection period following the earlier period of the injection period, the lift amount is set to a small lift amount smaller than the large lift amount and is in a range where the fuel injection speed increases.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: June 4, 2019
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Takeshi Nagasawa, Noriyuki Ota, Kenji Uchida, Ryohei Ono, Kiyotaka Sato, Hidefumi Fujimoto
  • Patent number: 10156182
    Abstract: A fuel injection valve is provided for a ceiling portion of a cylinder head. A tip of an ignition electrode is arranged in the vicinity of an injection tip of the fuel injection valve. A recess is provided for the ceiling portion. A center of a cavity is shifted with respect to a bore center of the cylinder. In a vertical cross-section of the inside of a combustion chamber taken along a plane passing through the injection tip of the fuel injection valve and the tip of the ignition electrode, a distance from the injection tip to a wall surface of the cavity at a side at which the ignition electrode is provided is longer than a distance from the injection tip to a wall surface of the cavity at an opposite side.
    Type: Grant
    Filed: December 25, 2015
    Date of Patent: December 18, 2018
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Kazuaki Narahara, Noriyuki Ota, Yoshihisa Nou, Akira Kageyama
  • Patent number: 10125667
    Abstract: A fuel injection valve is shifted, with respect to the bore center of a cylinder, toward one end of an engine's output shaft. A top surface of a piston has inclined surfaces, and is raised by the inclined surfaces. A cavity is formed by hollowing out portions of the inclined surfaces, and faces the injection axis of the fuel injection valve. In a vertical cross section taken along the plane passing through a particular location in an intake other-side region of a combustion chamber and the location of the fuel injection valve, the distance from an injection tip of the fuel injection valve to the wall surface of the cavity at the particular location is longer than that from the injection tip to the wall surface at a diametrically opposed location to the particular location.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: November 13, 2018
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Noriyuki Ota, Yoshihisa Nou, Kazuaki Narahara, Takeshi Nagasawa
  • Patent number: 10100775
    Abstract: A fuel injection valve is caused to inject fuel in a latter half of a compression stroke in such a manner that a fuel concentration immediately before start of combustion is higher in a middle portion of a combustion chamber than in an outer peripheral portion thereof in a low load range where the engine load is lower than a predetermined set reference load. An intake valve driving device is controlled in such a manner that an intake valve closing timing in the low load range is advanced on a retard side with respect to an intake bottom dead center in a case where the engine speed is high, as compared with a case where the engine speed is low, and intake air within a cylinder is blown back toward an intake port at least in a range where the engine speed is low.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: October 16, 2018
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Noriyuki Ota, Yoshihisa Nou, Akira Kageyama
  • Publication number: 20180230896
    Abstract: A fuel injection valve is shifted, with respect to the bore center of a cylinder, toward one end of an engine's output shaft. A top surface of a piston has inclined surfaces, and is raised by the inclined surfaces. A cavity is formed by hollowing out portions of the inclined surfaces, and faces the injection axis of the fuel injection valve. In a vertical cross section taken along the plane passing through a particular location in an intake other-side region of a combustion chamber and the location of the fuel injection valve, the distance from an injection tip of the fuel injection valve to the wall surface of the cavity at the particular location is longer than that from the injection tip to the wall surface at a diametrically opposed location to the particular location.
    Type: Application
    Filed: November 5, 2015
    Publication date: August 16, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Noriyuki OTA, Yoshihisa NOU, Kazuaki NARAHARA, Takeshi NAGASAWA
  • Publication number: 20180080401
    Abstract: Disclosed herein is a fuel injection control device for a direct injection engine including an engine body (engine 1) and a fuel injection control unit (engine controller 100). The fuel injection control unit injects a fuel in a predetermined injection mode into a combustion chamber (17) such that while the engine body is warm, an air-fuel mixture layer and a heat-insulating gas layer, surrounding the air-fuel mixture layer, are formed in the combustion chamber at a point in time when an air-fuel mixture ignites, and changes the injection mode of the fuel into the combustion chamber such that while the engine body is cold, the lower the temperature of the engine body is, the thinner the heat-insulating gas layer becomes.
    Type: Application
    Filed: March 16, 2016
    Publication date: March 22, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Takeshi NAGASAWA, Keiji ARAKI, Noriyuki OTA, Kenji UCHIDA, Ryohei ONO, Kiyotaka SATO, Hidefumi FUJIMOTO
  • Publication number: 20180058366
    Abstract: A fuel injection valve (6) is configured such that the effective opening area of an injection port (61) increases as its lift amount increases. A fuel injection control unit (an engine control unit 100) injects fuel in a lift amount changing mode wherein, when fuel is injected into a combustion chamber (17) in the terminal period of the compression stroke, the lift amount of the fuel injection valve is set to a predetermined large lift amount in the earlier period of the injection period, and in the later period of the injection period following the earlier period of the injection period, the lift amount is set to a small lift amount smaller than the large lift amount and is in a range where the fuel injection speed increases.
    Type: Application
    Filed: March 16, 2016
    Publication date: March 1, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Takeshi NAGASAWA, Noriyuki OTA, Kenji UCHIDA, Ryohei ONO, Kiyotaka SATO, Hidefumi FUJIMOTO
  • Publication number: 20180038306
    Abstract: A fuel injection valve is caused to inject fuel in a latter half of a compression stroke in such a manner that a fuel concentration immediately before start of combustion is higher in a middle portion of a combustion chamber than in an outer peripheral portion thereof in a low load range where the engine load is lower than a predetermined set reference load. An intake valve driving device is controlled in such a manner that an intake valve closing timing in the low load range is advanced on a retard side with respect to an intake bottom dead center in a case where the engine speed is high, as compared with a case where the engine speed is low, and intake air within a cylinder is blown back toward an intake port at least in a range where the engine speed is low.
    Type: Application
    Filed: August 2, 2017
    Publication date: February 8, 2018
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Noriyuki OTA, Yoshihisa NOU, Akira KAGEYAMA
  • Publication number: 20170356330
    Abstract: A fuel injection valve is provided for a ceiling portion of a cylinder head. A tip of an ignition electrode is arranged in the vicinity of an injection tip of the fuel injection valve. A recess is provided for the ceiling portion. A center of a cavity is shifted with respect to a bore center of the cylinder. In a vertical cross-section of the inside of a combustion chamber taken along a plane passing through the injection tip of the fuel injection valve and the tip of the ignition electrode, a distance from the injection tip to a wall surface of the cavity at a side at which the ignition electrode is provided is longer than a distance from the injection tip to a wall surface of the cavity at an opposite side.
    Type: Application
    Filed: December 25, 2015
    Publication date: December 14, 2017
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Kazuaki NARAHARA, Noriyuki OTA, Yoshihisa NOU, Akira KAGEYAMA
  • Patent number: 9488125
    Abstract: A control device of a direct-injection engine is provided. The control device includes an engine body having a piston provided inside a cylinder and a combustion chamber formed by the cylinder and the piston, an injector for injecting fuel into the combustion chamber, an ozone generator for generating ozone inside the combustion chamber, and a controller for controlling the injector and the ozone generator. The controller controls the injector to inject a first amount of the fuel and, after this fuel is ignited, to inject a second amount of the fuel, and the controller controls the ozone generator to generate ozone in synchronization with the fuel injection that is performed by the injector after the fuel ignition.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: November 8, 2016
    Assignee: Mazda Motor Corporation
    Inventors: Masahiko Fujimoto, Noriyuki Ota, Masatoshi Seto
  • Publication number: 20150275818
    Abstract: A control device of a direct-injection engine is provided. The control device includes an engine body having a piston provided inside a cylinder and a combustion chamber formed by the cylinder and the piston, an injector for injecting fuel into the combustion chamber, an ozone generator for generating ozone inside the combustion chamber, and a controller for controlling the injector and the ozone generator. The controller controls the injector to inject a first amount of the fuel and, after this fuel is ignited, to inject a second amount of the fuel, and the controller controls the ozone generator to generate ozone in synchronization with the fuel injection that is performed by the injector after the fuel ignition.
    Type: Application
    Filed: February 24, 2015
    Publication date: October 1, 2015
    Inventors: Masahiko Fujimoto, Noriyuki Ota, Masatoshi Seto
  • Patent number: 8838364
    Abstract: A control device of a spark-ignition gasoline engine is provided. The control device includes a controller for operating the engine body by controlling at least a fuel injection valve, an ignition plug, and a fuel pressure variable mechanism. Depending on the engine load range, the controller sets the combustion mode to a compression-ignition mode or a spark-ignition mode. In each mode, the controller also controls the fuel pressure, and the timing of fuel injection and ignition. The controller may also performs external EGR control in each mode.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: September 16, 2014
    Assignee: Mazda Motor Corporation
    Inventors: Kazuhiro Nagatsu, Masahisa Yamakawa, Kouhei Iwai, Yoshihisa Nou, Noriyuki Ota, Kazutoyo Watanabe, Naoya Watanabe, Hiroyuki Kurita, Shuji Oba, Tatsuya Koga
  • Patent number: 8706382
    Abstract: The disclosure provides a control device of a spark-ignition gasoline engine. When an operating state of an engine body is within a low engine speed range, a controller controls a fuel pressure variable mechanism so that a fuel pressure is higher within a high engine load range compared to a low engine load range, the controller operates, within the high engine load range, a fuel injection valve to perform a fuel injection at least at a timing that is more retarded than an injection timing of a fuel within the low engine load range and is within a retard period from a late stage of a compression stroke to an early stage of an expansion stroke, and the controller operates, within the high engine load range, an ignition plug to ignite at a timing within the retard period and further after the fuel injection.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: April 22, 2014
    Assignee: Mazda Motor Corporation
    Inventors: Shuji Oba, Kouhei Iwai, Kazuhiro Nagatsu, Masahisa Yamakawa, Noriyuki Ota, Naoya Watanabe, Hiroyuki Kurita, Tatsuya Fujikawa, Kenji Uchida, Daisuke Asaji, Takaaki Nagano
  • Patent number: 8655572
    Abstract: The disclosure provides a control device of a spark-ignition gasoline engine. When an operating state of an engine body is within a low engine speed range, a controller operates a fuel pressure variable mechanism so that a fuel pressure is higher within a high engine load range compared to a low engine load range, the controller operates, within the high engine load range, a fuel injection mechanism to perform at least a fuel injection into the cylinder by a cylinder internal injection valve at a timing during a retard period from a late stage of a compression stroke to an early stage of an expansion stroke, and the controller operates, within the high engine load range, an ignition plug to ignite at a timing during the retard period and after the fuel injection.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: February 18, 2014
    Assignee: Mazda Motor Corporation
    Inventors: Kouhei Iwai, Masahisa Yamakawa, Noriyuki Ota, Kazuhiro Nagatsu, Takashi Youso, Kazutoyo Watanabe, Hiroyuki Kurita, Naoya Watanabe, Takaaki Nagano, Shuji Oba
  • Publication number: 20120216774
    Abstract: The disclosure provides a control device of a spark-ignition gasoline engine. When an operating state of an engine body is within a low engine speed range, a controller controls a fuel pressure variable mechanism so that a fuel pressure is higher within a high engine load range compared to a low engine load range, the controller operates, within the high engine load range, a fuel injection valve to perform a fuel injection at least at a timing that is more retarded than an injection timing of a fuel within the low engine load range and is within a retard period from a late stage of a compression stroke to an early stage of an expansion stroke, and the controller operates, within the high engine load range, an ignition plug to ignite at a timing within the retard period and further after the fuel injection.
    Type: Application
    Filed: February 7, 2012
    Publication date: August 30, 2012
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Shuji Oba, Kouhei Iwai, Kazuhiro Nagatsu, Masahisa Yamakawa, Noriyuki Ota, Naoya Watanabe, Hiroyuki Kurita, Tatsuya Fujikawa, Kenji Uchida, Daisuke Asaji, Takaaki Nagano
  • Publication number: 20120216776
    Abstract: A control device of a spark-ignition gasoline engine is provided. The control device includes a controller for operating the engine body by controlling at least a fuel injection valve, an ignition plug, and a fuel pressure variable mechanism. Depending on the engine load range, the controller sets the combustion mode to a compression-ignition mode or a spark-ignition mode. In each mode, the controller also controls the fuel pressure, and the timing of fuel injection and ignition. The controller may also performs external EGR control in each mode.
    Type: Application
    Filed: February 7, 2012
    Publication date: August 30, 2012
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Kazuhiro Nagatsu, Masahisa Yamakawa, Kouhei Iwai, Yoshihisa Nou, Noriyuki Ota, Kazutoyo Watanabe, Naoya Watanabe, Hiroyuki Kurita, Shuji Oba, Tatsuya Koga
  • Publication number: 20120216775
    Abstract: The disclosure provides a control device of a spark-ignition gasoline engine. When an operating state of an engine body is within a low engine speed range, a controller operates a fuel pressure variable mechanism so that a fuel pressure is higher within a high engine load range compared to a low engine load range, the controller operates, within the high engine load range, a fuel injection mechanism to perform at least a fuel injection into the cylinder by a cylinder internal injection valve at a timing during a retard period from a late stage of a compression stroke to an early stage of an expansion stroke, and the controller operates, within the high engine load range, an ignition plug to ignite at a timing during the retard period and after the fuel injection.
    Type: Application
    Filed: February 7, 2012
    Publication date: August 30, 2012
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Kouhei Iwai, Masahisa Yamakawa, Noriyuki Ota, Kazuhiro Nagatsu, Takashi Youso, Kazutoyo Watanabe, Hiroyuki Kurita, Naoya Watanabe, Takaaki Nagano, Shuji Oba