Patents by Inventor Taiki Maiguma

Taiki Maiguma 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: 10961946
    Abstract: An engine system includes a combustion chamber including a cylinder, a fuel supply that supplies fuel including gasoline into the combustion chamber, circuitry configured to predict a knock will occur in the combustion chamber, and a fluid injector that injects a fluid into the combustion chamber. Further, there is circuitry configured to suppress a knock by instructing the fluid injector, when the knock is predicted to occur by the circuitry configured to predict, to inject the fluid into the combustion chamber within a period before a burned mass fraction reaches 50% after a start of combustion.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: March 30, 2021
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Kouji Shishime, Takashi Kohata, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Patent number: 10934962
    Abstract: An abnormality diagnosis device of an in-cylinder pressure sensor is provided. The device carries out a performance determination in which a performance quality of the sensor is determined based on an electric signal inputted from the sensor. The device carries out a first determination in which the performance determination is performed at a given timing, a performance recovery in which a given deposit removal control is executed in which a deposit accumulating inside the combustion chamber is removed when the performance quality of the in-cylinder pressure sensor is determined to fall below a given reference value, and a second determination in which the performance determination is carried out again after the performance recovery. In the second determination, the in-cylinder pressure sensor is diagnosed as abnormal when the performance quality of the sensor is determined to fall below the given reference value.
    Type: Grant
    Filed: October 25, 2019
    Date of Patent: March 2, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Shoji Fujiwara, Hidetoshi Hashimoto, Takuji Okumura, Shigeru Nakagawa, Yasushi Torii, Masayuki Kinoshita, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Patent number: 10876488
    Abstract: A failure diagnosis device for an in-cylinder pressure sensor is provided, which includes an in-cylinder pressure sensor, and an engine controller comprised of circuitry configured to execute a diagnosis module into which a signal of the sensor is inputted, to diagnose a failure of the sensor based on the signal. The diagnosis module includes a reading module configured to read the signal of the sensor within a specific crank angle range, a reference phase determining module configured to determine a reference phase that is a phase of a pressure change accompanying a volume change of the combustion chamber, and a failure determining module configured to determine that the sensor has failed, when the failure determining module determines a phase of the read signal of the sensor is delayed by an amount exceeding a predefined threshold from the determined reference phase.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: December 29, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Shoji Fujiwara, Hidetoshi Hashimoto, Takuji Okumura, Shigeru Nakagawa, Yasushi Torii, Masayuki Kinoshita, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Patent number: 10871112
    Abstract: A method and system for predicting the occurrence of a knock which will have a predetermined intensity or higher (intense knock) in an engine that burns an air-fuel mixture of gasoline fuel. The pressure in a combustion chamber is detected during an initial stage of combustion. This pressure is compared with a preset reference value to determine whether or not the cylinder inner pressure exceeds the reference value during the combustion. When the cylinder inner pressure exceeds the reference value, it is predicted that the intense knock will occur before an end of the combustion. If the intense knock is predicted, additional fuel or other material can be injected into the combustion chamber to prevent the occurrence of the intense knock.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: December 22, 2020
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Kouji Shishime, Takashi Kohata, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Patent number: 10859030
    Abstract: A control device for an engine is provided, which includes a knock intensity sensor configured to detect a knock intensity, an output adjustment mechanism configured to adjust an engine output torque, and a controller configured to control the output adjustment mechanism based on the knock intensity. The controller executes a first control in which the output adjustment mechanism is controlled to reduce the knock intensity when the number of strong knocks that is the number of times the knock intensity becomes a second determination intensity or greater is a given determination number or less and when the knock intensity is greater than a first determination intensity, and executes a second control in which the output adjustment mechanism is controlled to reduce the maximum torque more than when the number of strong knocks is the determination number or less, when the number of strong knocks is greater than the determination number.
    Type: Grant
    Filed: January 29, 2020
    Date of Patent: December 8, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Kouji Shishime, Takashi Kohata, Hidetoshi Hashimoto, Taiki Maiguma
  • Patent number: 10815917
    Abstract: A failure diagnosis system for an in-cylinder pressure sensor is provided, which includes an in-cylinder pressure sensor, a fuel injection valve, an engine controller including an engine control module and a diagnosis module. The engine control module controls the fuel injection valve to stop the supply of fuel to the engine, when a fuel cut condition is satisfied while the automobile travels. The diagnosis module includes a limiting module configured to limit an execution of the failure diagnosis of the in-cylinder pressure sensor until the diagnosis module determines that a given period has lapsed after the stop of fuel supply to the engine. The diagnosis module reads a signal of the in-cylinder pressure sensor when the given period has lapsed after the stop of the fuel supply to the engine, and diagnoses the failure of the in-cylinder pressure sensor based on the read signal of the in-cylinder pressure sensor.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: October 27, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Shoji Fujiwara, Hidetoshi Hashimoto, Takuji Okumura, Shigeru Nakagawa, Yasushi Torii, Masayuki Kinoshita, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Publication number: 20200325843
    Abstract: A control device for an engine is provided, which includes a knock intensity sensor configured to detect a knock intensity, an output adjustment mechanism configured to adjust an engine output torque, and a controller configured to control the output adjustment mechanism based on the knock intensity. The controller executes a first control in which the output adjustment mechanism is controlled to reduce the knock intensity when the number of strong knocks that is the number of times the knock intensity becomes a second determination intensity or greater is a given determination number or less and when the knock intensity is greater than a first determination intensity, and executes a second control in which the output adjustment mechanism is controlled to reduce the maximum torque more than when the number of strong knocks is the determination number or less, when the number of strong knocks is greater than the determination number.
    Type: Application
    Filed: January 29, 2020
    Publication date: October 15, 2020
    Inventors: Kouji Shishime, Takashi Kohata, Hidetoshi Hashimoto, Taiki Maiguma
  • Patent number: 10767592
    Abstract: A failure diagnosis device for an in-cylinder pressure sensor includes an in-cylinder pressure sensor, and a controller comprised of circuitry configured to execute a diagnosis module into which a signal of the in-cylinder pressure sensor is inputted and configured to diagnose a failure of the sensor based on the signal. The diagnosis module includes a reading module configured to read the signals of the in-cylinder pressure sensor at a first timing that is a timing retarded by a specific crank angle from a compression top dead center, and at a second timing that is a timing advanced by the specific crank angle from the compression top dead center, and a failure determining module configured to determine that the in-cylinder pressure sensor has failed when the failure determining module determines that a difference between signal values at the first timing and at the second timing exceeds a predefined threshold.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: September 8, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Shoji Fujiwara, Hidetoshi Hashimoto, Takuji Okumura, Shigeru Nakagawa, Yasushi Torii, Masayuki Kinoshita, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Publication number: 20200200078
    Abstract: A combustion control system for an engine mounted on an automobile is provided, which includes an ignition plug, intake and exhaust passages, an EGR passage, an EGR valve, and a control device having a processor which controls the ignition plug and the EGR valve according to an engine operating state and reduces deposit being accumulated inside a combustion chamber. The control device performs a control in which an accumulating amount of the deposit is estimated, and a control in which the deposit is removed when the estimated accumulating amount becomes more than a given setting value. In the deposit removal control, a control of the ignition plug in which a mixture gas is caused to combust by igniting the mixture gas, and a control of the EGR valve in which an amount of exhaust gas introduced into the combustion chamber is decreased, are performed.
    Type: Application
    Filed: October 25, 2019
    Publication date: June 25, 2020
    Inventors: Kenichi Nakashima, Hiroki Tanaka, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Publication number: 20200200112
    Abstract: An abnormality diagnosis device of an in-cylinder pressure sensor is provided. The device carries out a performance determination in which a performance quality of the sensor is determined based on an electric signal inputted from the sensor. The device carries out a first determination in which the performance determination is performed at a given timing, a performance recovery in which a given deposit removal control is executed in which a deposit accumulating inside the combustion chamber is removed when the performance quality of the in-cylinder pressure sensor is determined to fall below a given reference value, and a second determination in which the performance determination is carried out again after the performance recovery. In the second determination, the in-cylinder pressure sensor is diagnosed as abnormal when the performance quality of the sensor is determined to fall below the given reference value.
    Type: Application
    Filed: October 25, 2019
    Publication date: June 25, 2020
    Inventors: Shoji Fujiwara, Hidetoshi Hashimoto, Takuji Okumura, Shigeru Nakagawa, Yasushi Torii, Masayuki Kinoshita, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Patent number: 10641161
    Abstract: A control device for a compression-ignition engine is provided, in which partial compression-ignition combustion including spark ignition (SI) combustion performed by combusting a portion of mixture gas inside a cylinder by spark-ignition followed by compression ignition (CI) combustion performed by causing the rest of the mixture gas inside the cylinder to self-ignite is executed within a part of an operating range of the engine. The device includes a detector configured to detect a parameter related to noise caused by the combustion inside the cylinder, an EGR (exhaust gas recirculation) controller configured to change an EGR ratio being a ratio of exhaust gas introduced into the cylinder, and a combustion controller configured to control the EGR controller to increase the EGR ratio when a noise index value specified based on the detected parameter of the detector is confirmed to exceed a given threshold during the partial compression-ignition combustion.
    Type: Grant
    Filed: October 22, 2018
    Date of Patent: May 5, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Daisuke Tanaka, Yuichiro Tsumura, Kenichi Nakashima, Taiki Maiguma, Hiroki Morimoto, Masayoshi Higashio, Kensuke Ashikaga
  • Publication number: 20200072150
    Abstract: A failure diagnosis device for an in-cylinder pressure sensor includes an in-cylinder pressure sensor, and a controller comprised of circuitry configured to execute a diagnosis module into which a signal of the in-cylinder pressure sensor is inputted and configured to diagnose a failure of the sensor based on the signal. The diagnosis module includes a reading module configured to read the signals of the in-cylinder pressure sensor at a first timing that is a timing retarded by a specific crank angle from a compression top dead center, and at a second timing that is a timing advanced by the specific crank angle from the compression top dead center, and a failure determining module configured to determine that the in-cylinder pressure sensor has failed when the failure determining module determines that a difference between signal values at the first timing and at the second timing exceeds a predefined threshold.
    Type: Application
    Filed: July 2, 2019
    Publication date: March 5, 2020
    Inventors: Shoji Fujiwara, Hidetoshi Hashimoto, Takuji Okumura, Shigeru Nakagawa, Yasushi Torii, Masayuki Kinoshita, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Publication number: 20200072148
    Abstract: A failure diagnosis system for an in-cylinder pressure sensor is provided, which includes an in-cylinder pressure sensor, a fuel injection valve, an engine controller including an engine control module and a diagnosis module. The engine control module controls the fuel injection valve to stop the supply of fuel to the engine, when a fuel cut condition is satisfied while the automobile travels. The diagnosis module includes a limiting module configured to limit an execution of the failure diagnosis of the in-cylinder pressure sensor until the diagnosis module determines that a given period has lapsed after the stop of fuel supply to the engine. The diagnosis module reads a signal of the in-cylinder pressure sensor when the given period has lapsed after the stop of the fuel supply to the engine, and diagnoses the failure of the in-cylinder pressure sensor based on the read signal of the in-cylinder pressure sensor.
    Type: Application
    Filed: July 2, 2019
    Publication date: March 5, 2020
    Inventors: Shoji Fujiwara, Hidetoshi Hashimoto, Takuji Okumura, Shigeru Nakagawa, Yasushi Torii, Masayuki Kinoshita, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Publication number: 20200072149
    Abstract: A failure diagnosis device for an in-cylinder pressure sensor is provided, which includes an in-cylinder pressure sensor, and an engine controller comprised of circuitry configured to execute a diagnosis module into which a signal of the sensor is inputted, to diagnose a failure of the sensor based on the signal. The diagnosis module includes a reading module configured to read the signal of the sensor within a specific crank angle range, a reference phase determining module configured to determine a reference phase that is a phase of a pressure change accompanying a volume change of the combustion chamber, and a failure determining module configured to determine that the sensor has failed, when the failure determining module determines a phase of the read signal of the sensor is delayed by an amount exceeding a predefined threshold from the determined reference phase.
    Type: Application
    Filed: July 2, 2019
    Publication date: March 5, 2020
    Inventors: Shoji Fujiwara, Hidetoshi Hashimoto, Takuji Okumura, Shigeru Nakagawa, Yasushi Torii, Masayuki Kinoshita, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Patent number: 10480479
    Abstract: A control device for an engine in which partial compression-ignition combustion including SI combustion performed by forcibly combusting a portion of mixture gas inside a cylinder followed by CI combustion performed by causing the rest of the mixture gas inside the cylinder to self-ignite is executed within a part of an operating range of the engine, is provided. The device includes a detector configured to detect a parameter related to noise caused by the combustion inside the cylinder, a memory configured to store a characteristic defining a relationship between a start timing of the CI combustion and a combustion noise index, and a processor configured to specify a given combustion noise index value based on the detection value of the detector, and control the start timing of the CI combustion.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: November 19, 2019
    Assignee: Mazda Motor Corporation
    Inventors: Kenichi Nakashima, Keitaro Ezumi, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma, Takuji Okumura, Kensuke Ashikaga, Masayoshi Higashio
  • Publication number: 20190226421
    Abstract: An engine system includes a combustion chamber including a cylinder, a fuel supply that supplies fuel including gasoline into the combustion chamber, circuitry configured to predict a knock will occur in the combustion chamber, and a fluid injector that injects a fluid into the combustion chamber. Further, there is circuitry configured to suppress a knock by instructing the fluid injector, when the knock is predicted to occur by the circuitry configured to predict, to inject the fluid into the combustion chamber within a period before a burned mass fraction reaches 50% after a start of combustion.
    Type: Application
    Filed: January 22, 2019
    Publication date: July 25, 2019
    Applicant: Mazda Motor Corporation
    Inventors: Kouji Shishime, Takashi Kohata, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma
  • Publication number: 20190226411
    Abstract: A method and system for predicting the occurrence of a knock which will have a predetermined intensity or higher (intense knock) in an engine that burns an air-fuel mixture of gasoline fuel. The pressure in a combustion chamber is detected during an initial stage of combustion. This pressure is compared with a preset reference value to determine whether or not the cylinder inner pressure exceeds the reference value during the combustion. When the cylinder inner pressure exceeds the reference value, it is predicted that the intense knock will occur before an end of the combustion. If the intense knock is predicted, additional fuel or other material can be injected into the combustion chamber to prevent the occurrence of the intense knock.
    Type: Application
    Filed: January 22, 2019
    Publication date: July 25, 2019
    Applicant: Mazda Motor Corporation
    Inventors: Kouji SHISHIME, Takashi KOHATA, Yuichiro TSUMURA, Daisuke TANAKA, Taiki MAIGUMA
  • Publication number: 20190145306
    Abstract: A control device for a compression-ignition engine is provided, in which partial compression-ignition combustion including spark ignition (SI) combustion performed by combusting a portion of mixture gas inside a cylinder by spark-ignition followed by compression ignition (CI) combustion performed by causing the rest of the mixture gas inside the cylinder to self-ignite is executed within a part of an operating range of the engine. The device includes a detector configured to detect a parameter related to noise caused by the combustion inside the cylinder, an EGR (exhaust gas recirculation) controller configured to change an EGR ratio being a ratio of exhaust gas introduced into the cylinder, and a combustion controller configured to control the EGR controller to increase the EGR ratio when a noise index value specified based on the detected parameter of the detector is confirmed to exceed a given threshold during the partial compression-ignition combustion.
    Type: Application
    Filed: October 22, 2018
    Publication date: May 16, 2019
    Inventors: Daisuke Tanaka, Yuichiro Tsumura, Kenichi Nakashima, Taiki Maiguma, Hiroki Morimoto, Masayoshi Higashio, Kensuke Ashikaga
  • Publication number: 20190063394
    Abstract: A control device for an engine in which partial compression-ignition combustion including SI combustion performed by forcibly combusting a portion of mixture gas inside a cylinder followed by CI combustion performed by causing the rest of the mixture gas inside the cylinder to self-ignite is executed within a part of an operating range of the engine, is provided. The device includes a detector configured to detect a parameter related to noise caused by the combustion inside the cylinder, a memory configured to store a characteristic defining a relationship between a start timing of the CI combustion and a combustion noise index, and a processor configured to specify a given combustion noise index value based on the detection value of the detector, and control the start timing of the CI combustion.
    Type: Application
    Filed: August 8, 2018
    Publication date: February 28, 2019
    Inventors: Kenichi Nakashima, Keitaro Ezumi, Yuichiro Tsumura, Daisuke Tanaka, Taiki Maiguma, Takuji Okumura, Kensuke Ashikaga, Masayoshi Higashio