Patents by Inventor Takeatsu ITO

Takeatsu ITO 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: 11008930
    Abstract: When an incremental amount of a steering angle exceeds a reference incremental amount, an ECU 60 executes vehicle attitude control of reducing an output torque of an engine, and, in a given operating range, drives a spark plug 16 to allow an air-fuel mixture to be self-ignited at a given timing, thereby executing SPCCI combustion. When there is a request for an additional deceleration from the vehicle attitude control (#12: YES) and the SPCCI combustion is performed (#13: YES), the ECU 60 prohibits ignition retardation and performs torque reduction for the vehicle attitude control, by fuel amount reduction control of reducing the amount of fuel to be supplied into a cylinder 2 (#14). On the other hand, when the SPCCI combustion is not performed (NO in #13), the ECU 60 performs the ignition retardation to attain the torque reduction for the vehicle attitude control (#15).
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: May 18, 2021
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Shinji Takayama, Takeatsu Ito, Michio Ito, Kenko Ujihara, Daisaku Ogawa, Daisuke Umetsu
  • Patent number: 11002209
    Abstract: An engine control device is provided, which includes an engine body where a cylinder is formed, an exhaust passage through which exhaust gas discharged from the engine body circulates, a NOx sensor disposed in the exhaust passage and configured to detect a concentration of NOx in the exhaust gas, an injector configured to change an air-fuel ratio inside the cylinder, an in-cylinder temperature changer configured to change a temperature inside the cylinder, and a controller configured to control the injector and the exhaust shutter valve. The controller controls the injector based on a detection value of the NOx sensor to variably set the air-fuel ratio inside the cylinder, and when a particular condition that the air-fuel ratio inside the cylinder is leaner than a preset upper limit is satisfied, and causes the in-cylinder temperature changer to raise the temperature inside the cylinder.
    Type: Grant
    Filed: October 25, 2019
    Date of Patent: May 11, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Kota Maekawa, Takeatsu Ito, Tomokuni Kusunoki, Keitaro Ezumi
  • Patent number: 10982610
    Abstract: A controller for an engine estimates a temperature of the exhaust gas and controls the engine according to the estimated exhaust temperature. The controller changes the air-fuel ratio to a stoichiometric air-fuel ratio or leaner. The controller calculates the progress of combustion on the basis of signals of sensors, and estimates an exhaust temperature. In the case where the air-fuel ratio is the stoichiometric air-fuel ratio, the controller estimates the exhaust temperature on the basis of the progress of the combustion, the engine temperature, and a first relationship that is at least defined between the progress of the combustion and the exhaust temperature, . In the case where the air-fuel ratio is lean, the controller estimates the exhaust temperature on the basis of the progress of the combustion, the engine temperature, and a second relationship that differs from the first relationship.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: April 20, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Keisuke Ohtsuka, Kentaro Kimura, Takeatsu Ito, Tomokuni Kusunoki
  • Patent number: 10968856
    Abstract: When an incremental amount of a steering angle exceeds a reference incremental amount, an ECU 60 executes vehicle attitude control of reducing an output torque of an engine, and, in a given operating range, drives a spark plug 16 in a manner allowing an air-fuel mixture to be self-ignited at a given timing, thereby executing SPCCI combustion. When there is a request for an additional deceleration from the vehicle attitude control (#12: YES), and the SPCCI combustion is performed (#13: YES), the ECU 60 executes fuel amount reduction control of reducing the amount of fuel to be supplied into a cylinder 2 (#14), so as to attain torque reduction for the vehicle attitude control. On the other hand, when the SPCCI combustion is not performed (#13: NO), the ECU 60 executes ignition retardation control of retarding an ignition timing of the spark plug 16 (#15).
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: April 6, 2021
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Shinji Takayama, Takeatsu Ito, Michio Ito, Kenko Ujihara, Daisaku Ogawa, Daisuke Umetsu
  • Publication number: 20210079869
    Abstract: An engine control method includes a step of setting combustion mode in which a first combustion mode in which a mixed gas is combusted by propagating flame or a second combustion mode in which the mixed gas is combusted by self-ignition is selected, a step of setting air-fuel ratio mode in which a lean first air-fuel ratio mode or a second air-fuel ratio mode equal to or richer than a theoretical air-fuel ratio is selected, a step of setting torque reduction in which a torque reduction amount by which a torque generated by an engine is reduced based on a steer angle of a steering wheel, and a suppressing step in which reducing the torque generated by the engine based on the torque reduction amount set in the step of setting torque reduction is suppressed.
    Type: Application
    Filed: January 16, 2019
    Publication date: March 18, 2021
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Shinji TAKAYAMA, Takeatsu ITO, Masahiro NAGOSHI, Yuichiro AKIYA, Yuto MATSUSHIMA, Kenko UJIHARA, Daisaku OGAWA, Daisuke UMETSU
  • Publication number: 20210062709
    Abstract: When an incremental amount of a steering angle exceeds a reference incremental amount, an ECU 60 executes vehicle attitude control of reducing an output torque of an engine, and, in a given operating range, drives a spark plug 16 to allow an air-fuel mixture to be self-ignited at a given timing, thereby executing SPCCI combustion. When there is a request for an additional deceleration from the vehicle attitude control (#12: YES) and the SPCCI combustion is performed (#13: YES), the ECU 60 prohibits ignition retardation and performs torque reduction for the vehicle attitude control, by fuel amount reduction control of reducing the amount of fuel to be supplied into a cylinder 2 (#14). On the other hand, when the SPCCI combustion is not performed (NO in #13), the ECU 60 performs the ignition retardation to attain the torque reduction for the vehicle attitude control (#15).
    Type: Application
    Filed: January 22, 2019
    Publication date: March 4, 2021
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Shinji TAKAYAMA, Takeatsu ITO, Michio ITO, Kenko UJIHARA, Daisaku OGAWA, Daisuke UMETSU
  • Publication number: 20210047978
    Abstract: A control unit performs a vehicle attitude control to reduce a torque generated by an engine when an increase in a steering angle exceeds a standard increase, and a spark ignition controlled compression ignition combustion in a predetermined operating range. In the spark ignition controlled compression ignition combustion, switching of an air-fuel ratio mode is performed between a first air-fuel ratio mode (?>1) is formed and a second air-fuel ratio mode (in which a mixed gas of ??1) is formed. If the switching of the air-fuel ratio mode is requested without the vehicle attitude control, the control unit allows performing the requested switching of the air-fuel ratio mode. In contrast, if the mode switching is requested in a state where the vehicle attitude control is requested, the control unit disallows switching of the air-fuel ratio mode even when the switching of the air-fuel ratio mode is requested.
    Type: Application
    Filed: January 16, 2019
    Publication date: February 18, 2021
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Shinji TAKAYAMA, Takeatsu ITO, Masahiro NAGOSHI, Yuichiro AKIYA, Yuto MATSUSHIMA, Kenko UJIHARA, Daisaku OGAWA, Daisuke UMETSU
  • Patent number: 10876485
    Abstract: An engine control device is provided, which includes an ignition plug configured to ignite mixture gas inside a cylinder of the engine, an injector configured to change an air-fuel ratio inside the cylinder, a NOx sensor, and a controller including a processor. The controller performs a first control to control the ignition plug so that ignition is performed at a basic ignition timing or an ignition timing after the basic timing is corrected based on a combustion state of the mixture gas, and a second control to control the injector so that a NOx concentration approaches a given target value. When the ignition timing is corrected by the first control to a retarding side, the controller suspends a correction to a richer side even if the NOx concentration is a concentration at which the air-fuel ratio is corrected to the richer side by the second control.
    Type: Grant
    Filed: October 2, 2019
    Date of Patent: December 29, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Kota Maekawa, Takeatsu Ito, Kouji Miyamoto
  • Publication number: 20200400090
    Abstract: When an incremental amount of a steering angle exceeds a reference incremental amount, an ECU 60 executes vehicle attitude control of reducing an output torque of an engine, and, in a given operating range, drives a spark plug 16 in a manner allowing an air-fuel mixture to be self-ignited at a given timing, thereby executing SPCCI combustion. When there is a request for an additional deceleration from the vehicle attitude control (#12: YES), and the SPCCI combustion is performed (#13: YES), the ECU 60 executes fuel amount reduction control of reducing the amount of fuel to be supplied into a cylinder 2 (#14), so as to attain torque reduction for the vehicle attitude control. On the other hand, when the SPCCI combustion is not performed (#13: NO), the ECU 60 executes ignition retardation control of retarding an ignition timing of the spark plug 16 (#15).
    Type: Application
    Filed: January 22, 2019
    Publication date: December 24, 2020
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Shinji TAKAYAMA, Takeatsu ITO, Michio ITO, Kenko UJIHARA, Daisaku OGAWA, Daisuke UMETSU
  • Patent number: 10844798
    Abstract: An engine control device that can suppress thermal degradation of a particulate filter is provided. The device executes a fuel injection control module that restricts the supply of fuel by an injector if a fuel cutting condition is satisfied, an accumulation estimation module that estimates the accumulated amount of soot trapped in a GPF, and a regeneration control module that performs regeneration control for regenerating the GPF by burning soot if the accumulated soot amount exceeds a predetermined setting amount. A fuel cut prohibition line is set in advance and defines a prohibition temperature at which fuel cutting control is to be prohibited in accordance with the accumulated soot amount. The device further executes a prohibition control module that prohibits performance of fuel cutting control by the fuel injection control module if the temperature of the GPF is higher than the prohibition temperature.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: November 24, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Hiroyuki Kurita, Eijiro Tanaka, Takeatsu Ito, Hiroshi Yoshida
  • Publication number: 20200355136
    Abstract: A controller for an engine estimates a temperature of the exhaust gas and controls the engine according to the estimated exhaust temperature. The controller changes the air-fuel ratio to a stoichiometric air-fuel ratio or leaner. The controller calculates the progress of combustion on the basis of signals of sensors, and estimates an exhaust temperature. In the case where the air-fuel ratio is the stoichiometric air-fuel ratio, the controller estimates the exhaust temperature on the basis of the progress of the combustion, the engine temperature, and a first relationship that is at least defined between the progress of the combustion and the exhaust temperature, . In the case where the air-fuel ratio is lean, the controller estimates the exhaust temperature on the basis of the progress of the combustion, the engine temperature, and a second relationship that differs from the first relationship.
    Type: Application
    Filed: March 6, 2020
    Publication date: November 12, 2020
    Inventors: Keisuke Ohtsuka, Kentaro Kimura, Takeatsu Ito, Tomokuni Kusunoki
  • Publication number: 20200141344
    Abstract: An engine control device is provided, which includes an ignition plug configured to ignite mixture gas inside a cylinder of the engine, an injector configured to change an air-fuel ratio inside the cylinder, a NOx sensor, and a controller including a processor. The controller performs a first control to control the ignition plug so that ignition is performed at a basic ignition timing or an ignition timing after the basic timing is corrected based on a combustion state of the mixture gas, and a second control to control the injector so that a NOx concentration approaches a given target value. When the ignition timing is corrected by the first control to a retarding side, the controller suspends a correction to a richer side even if the NOx concentration is a concentration at which the air-fuel ratio is corrected to the richer side by the second control.
    Type: Application
    Filed: October 2, 2019
    Publication date: May 7, 2020
    Inventors: Kota Maekawa, Takeatsu Ito, Kouji Miyamoto
  • Publication number: 20200141345
    Abstract: An engine control device is provided, which includes an engine body where a cylinder is formed, an exhaust passage through which exhaust gas discharged from the engine body circulates, a NOx sensor disposed in the exhaust passage and configured to detect a concentration of NOx in the exhaust gas, an injector configured to change an air-fuel ratio inside the cylinder, an in-cylinder temperature changer configured to change a temperature inside the cylinder, and a controller configured to control the injector and the exhaust shutter valve. The controller controls the injector based on a detection value of the NOx sensor to variably set the air-fuel ratio inside the cylinder, and when a particular condition that the air-fuel ratio inside the cylinder is leaner than a preset upper limit is satisfied, and causes the in-cylinder temperature changer to raise the temperature inside the cylinder.
    Type: Application
    Filed: October 25, 2019
    Publication date: May 7, 2020
    Inventors: Kota Maekawa, Takeatsu Ito, Tomokuni Kusunoki, Keitaro Ezumi
  • Publication number: 20200025118
    Abstract: An engine control device that can suppress thermal degradation of a particulate filter is provided. The device executes a fuel injection control module that restricts the supply of fuel by an injector if a fuel cutting condition is satisfied, an accumulation estimation module that estimates the accumulated amount of soot trapped in a GPF, and a regeneration control module that performs regeneration control for regenerating the GPF by burning soot if the accumulated soot amount exceeds a predetermined setting amount. A fuel cut prohibition line is set in advance and defines a prohibition temperature at which fuel cutting control is to be prohibited in accordance with the accumulated soot amount. The device further executes a prohibition control module that prohibits performance of fuel cutting control by the fuel injection control module if the temperature of the GPF is higher than the prohibition temperature.
    Type: Application
    Filed: June 10, 2019
    Publication date: January 23, 2020
    Inventors: Hiroyuki Kurita, Eijiro Tanaka, Takeatsu Ito, Hiroshi Yoshida
  • Patent number: 10526981
    Abstract: An engine control device is provided, that includes an air amount controller, an ignition timing controller, a basic target torque determinator which determines a basic target torque, a change rate acquirer for acquiring a change rate of a steering operation, a target additional deceleration setter for increasing a target additional deceleration while an increase rate thereof becomes less as the change rate increases, a torque reduction amount determinator for determining an engine torque reduction amount, a final target torque determinator for determining a final target torque, and an actual air amount estimator for estimating an actual air amount introduced into a combustion chamber. The air amount controller determines a target air amount and controls the intake air amount to achieve the target air amount. The ignition timing controller retards the ignition timing more as the actual air amount becomes more excessive with respect to the target amount.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: January 7, 2020
    Assignee: Mazda Motor Corporation
    Inventors: Chikako Ohisa, Osamu Sunahara, Daisuke Umetsu, Takahiro Kawamura, Yasunori Takahara, Daisaku Ogawa, Takeatsu Ito
  • Patent number: 10221778
    Abstract: An engine control device for controlling an engine based on a vehicle operating state is provided, that includes a basic target torque determinator for setting a vehicle target acceleration based on an accelerator pedal operation and determining a basic target engine torque based on the vehicle target acceleration, a torque reduction demand determinator for determining whether an engine torque reduction is demanded based on the vehicle operating state other than the accelerator pedal operation, a torque reduction amount determinator for determining an engine torque reduction amount according to the operating state when the torque reduction is demanded, a final target torque determinator for determining as a final target torque an engine torque calculated by subtracting the torque reduction amount from the basic target torque when the torque reduction is demanded, and an engine controller for controlling the engine so as to output the final target torque.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: March 5, 2019
    Assignee: Mazda Motor Corporation
    Inventors: Chikako Ohisa, Osamu Sunahara, Daisuke Umetsu, Takahiro Kawamura, Yasunori Takahara, Daisaku Ogawa, Takeatsu Ito
  • Patent number: 10151259
    Abstract: The engine control device comprises a basic target torque-deciding part for deciding a basic target torque based on a driving state of a vehicle, a torque reduction amount-deciding part for deciding a torque reduction amount based on a steering wheel operation state, an TCM for deciding a torque-down demand amount, based on a driving state of the vehicle other than the steering wheel operation state, and a final target torque-deciding part for deciding a final target torque, based on the decided basic target torque, the decided torque reduction amount and the decided torque-down demand amount, wherein the final target torque-deciding part is operable, when there is a torque-down demand, to restrict a change in the final target torque corresponding to a change in the torque reduction amount.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: December 11, 2018
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Chikako Ohisa, Osamu Sunahara, Daisuke Umetsu, Takuo Hirano, Kunihiro Shishima, Takahiro Kawamura, Yasunori Takahara, Daisaku Ogawa, Takeatsu Ito
  • Patent number: 10138824
    Abstract: The turbocharged engine control device comprises a basic target torque-deciding part for deciding a basic target torque based on a driving state of a vehicle including an accelerator pedal operation state; a torque reduction amount-deciding part for deciding a torque reduction amount based on a driving state of the vehicle other than the accelerator pedal operation state; a final target torque-deciding part for deciding a final target torque based on the decided basic target torque and the decided torque reduction amount; and an engine output control part for controlling an intake air amount so as to realize a target air amount required for an engine to output the decided final target torque, wherein the engine output control part is operable, when an operating state of the engine falls within a supercharging region, to restrict a reduction in the intake air amount corresponding to a change in the torque reduction amount.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: November 27, 2018
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Chikako Ohisa, Osamu Sunahara, Daisuke Umetsu, Taizo Ohmae, Yugou Sunagare, Yasunori Takahara, Daisaku Ogawa, Takahiro Kawamura, Takeatsu Ito
  • Patent number: 10125670
    Abstract: The turbocharged engine control device comprises a basic target torque-deciding part for deciding a basic target torque based on a driving state of a vehicle including an accelerator pedal operation state; a torque reduction amount-deciding part for deciding a torque reduction amount based on a driving state of the vehicle other than the accelerator pedal operation state; a final target torque-deciding part for deciding a final target torque based on the decided basic target torque and the decided torque reduction amount; and an engine output control part for controlling the engine so as to cause the engine to output the decided final target torque, wherein the engine output control part is operable, when an operating state of the engine falls within a supercharging region where supercharging by a compressor, to restrict control of the engine corresponding to a change in the torque reduction amount.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: November 13, 2018
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Chikako Ohisa, Osamu Sunahara, Daisuke Umetsu, Taizo Ohmae, Yugou Sunagare, Yasunori Takahara, Daisaku Ogawa, Takahiro Kawamura, Takeatsu Ito
  • Patent number: 10024257
    Abstract: A PCM comprises a basic target torque-deciding part for deciding a basic target torque, based on a driving state of a vehicle including an accelerator pedal operation state, a torque reduction amount-deciding part for deciding a torque reduction amount, based on a driving state of the vehicle other than the accelerator pedal operation state, a final target torque-deciding part for deciding a final target torque, based on the decided basic target torque and the decided torque reduction amount, and an engine output control part for controlling an engine to cause the engine to output the decided final target torque, wherein the engine output control part is operable to prohibit switching of an operation mode of the engine from being performed simultaneously with control of the engine according to a change in the final target torque corresponding to a change in the torque reduction amount.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: July 17, 2018
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Chikako Ohisa, Osamu Sunahara, Daisuke Umetsu, Takuo Hirano, Kunihiro Shishima, Takahiro Kawamura, Yasunori Takahara, Daisaku Ogawa, Takeatsu Ito