Patents by Inventor Takayoshi Kawai

Takayoshi Kawai 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: 11712982
    Abstract: A vehicle includes: a power storage device; a rotary electric machine; a power generation device; a heat radiation unit configured to radiate exhaust heat from the rotary electric machine and the power generation device; and a control device configured to control power generation by the power generation device so as to increase an amount of power generated by the power generation device when vehicle required power due to drive of the vehicle is smaller than predetermined power compared to when the vehicle required power is larger than the predetermined power. An amount of power generated by the rotary electric machine and the power generation device is equal to or less than allowable generated electric power calculated from the amount of heat that is able to radiated by the heat radiation unit.
    Type: Grant
    Filed: March 22, 2022
    Date of Patent: August 1, 2023
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takashi Amano, Takayoshi Kawai
  • Patent number: 11458950
    Abstract: A drive force control system configured to reduce a total energy consumption of a hybrid vehicle. The drive force control system calculates: an output power of the engine which can optimize a thermal efficiency given that the engine is operated at a best fuel point; and a required electric power to be supplied from a battery or to be generated by a control motor, which can adjust the drive power established by the output power of the engine to the required power. A power exchange between the control motor and the battery is interrupted if the required electric power to be supplied from the electric storage device or to be generated by the control motor is less than a first predetermined electric power.
    Type: Grant
    Filed: January 23, 2020
    Date of Patent: October 4, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Ryosuke Ikemura, Naoto Kato, Takayoshi Kawai, Teppei Yoshioka, Hiromasa Hashimoto, Hiroshi Watanabe, Yasuhiro Kuze
  • Publication number: 20220305957
    Abstract: A vehicle includes: a power storage device; a rotary electric machine; a power generation device; a heat radiation unit configured to radiate exhaust heat from the rotary electric machine and the power generation device; and a control device configured to control power generation by the power generation device so as to increase an amount of power generated by the power generation device when vehicle required power due to drive of the vehicle is smaller than predetermined power compared to when the vehicle required power is larger than the predetermined power. An amount of power generated by the rotary electric machine and the power generation device is equal to or less than allowable generated electric power calculated from the amount of heat that is able to radiated by the heat radiation unit.
    Type: Application
    Filed: March 22, 2022
    Publication date: September 29, 2022
    Inventors: Takashi Amano, Takayoshi Kawai
  • Publication number: 20220219673
    Abstract: A control system for a hybrid vehicle that is configured to generate a driving force as required even if it is necessary to charge a battery rapidly. The hybrid vehicle may be propelled in a parallel mode in which power of the engine is partially translated into electric power by a motor and the remaining power of the engine is delivered to drive wheels. In a case that a rapid charging command is transmitted and that a required driving force is greater than a first driving force, the motor is operated to generate electric power in a predetermined amount, and the driving force is restricted to the first driving force.
    Type: Application
    Filed: January 10, 2022
    Publication date: July 14, 2022
    Inventors: Hiroshi Watanabe, Kohji Yamamoto, Ryutaro Moriguchi, Takashi Matsumoto, Takeru Tomita, Yuma Matsumoto, Kentaroh Kanzaki, Takayoshi Kawai
  • Patent number: 11247661
    Abstract: It is provided a control device for a hybrid vehicle including a controller configured to control an engine, a first motor, and an automatic transmission and a control method of the hybrid vehicle. The controller is configured to determine whether or not an operation state of the engine is changeable, when an upshift of the hybrid vehicle is performed, decrease torque of an input shaft of the automatic transmission by outputting negative torque acting to decrease the torque of the input shaft of the automatic transmission from the first motor when a prohibition condition that the operation state of the engine is not changeable is established, and decrease engine torque output from the engine to decrease the torque of the input shaft of the automatic transmission to be decreased accompanied by the upshift when the prohibition condition is not established and the operation state of the engine is changeable.
    Type: Grant
    Filed: January 23, 2020
    Date of Patent: February 15, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Koji Miwa, Takayoshi Kawai, Kunihiko Usui
  • Patent number: 10876483
    Abstract: A control device for an internal combustion engine is configured, where a designated cam switching condition is met, to execute a boost pressure control processing and an air amount control processing. In the boost pressure control processing, the control device controls a boost pressure control device such that a boost pressure control parameter does not increase in synchronization with execution of a cam switching operation and decreases in accordance with an increase of a required engine torque after the execution of the cam switching operation. In the air amount control processing, the control device controls the opening degree of a throttle valve to its closed side in synchronization with the cam switching operation such that a difference of an in-cylinder charge air amount is not produced before and after the execution of the cam switching operation.
    Type: Grant
    Filed: November 26, 2018
    Date of Patent: December 29, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shigehiro Sugihira, Noriyasu Adachi, Keisuke Sasaki, Takayoshi Kawai
  • Publication number: 20200247391
    Abstract: It is provided a control device for a hybrid vehicle including a controller configured to control an engine, a first motor, and an automatic transmission and a control method of the hybrid vehicle. The controller is configured to determine whether or not an operation state of the engine is changeable, when an upshift of the hybrid vehicle is performed, decrease torque of an input shaft of the automatic transmission by outputting negative torque acting to decrease the torque of the input shaft of the automatic transmission from the first motor when a prohibition condition that the operation state of the engine is not changeable is established, and decrease engine torque output from the engine to decrease the torque of the input shaft of the automatic transmission to be decreased accompanied by the upshift when the prohibition condition is not established and the operation state of the engine is changeable.
    Type: Application
    Filed: January 23, 2020
    Publication date: August 6, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Koji Miwa, Takayoshi Kawai, Kunihiko Usui
  • Publication number: 20200247390
    Abstract: A drive force control system configured to reduce a total energy consumption of a hybrid vehicle. The drive force control system calculates: an output power of the engine which can optimize a thermal efficiency given that the engine is operated at a best fuel point; and a required electric power to be supplied from a battery or to be generated by a control motor, which can adjust the drive power established by the output power of the engine to the required power. A power exchange between the control motor and the battery is interrupted if the required electric power to be supplied from the electric storage device or to be generated by the control motor is less than a first predetermined electric power.
    Type: Application
    Filed: January 23, 2020
    Publication date: August 6, 2020
    Inventors: Ryosuke IKEMURA, Naoto KATO, Takayoshi KAWAI, Teppei YOSHIOKA, Hiromasa HASHIMOTO, Hiroshi WATANABE, Yasuhiro KUZE
  • Patent number: 10710446
    Abstract: An engine starting system for starting an engine promptly during propulsion without reducing a drive force. When a condition to crank the engine is satisfied during propulsion in a neutral stage, torque is applied to an input rotary element to crank the engine by reducing a rotational speed of a control rotary element by increasing a torque capacity of a first engagement device to utilize an inertial force of the free rotary element as a reaction force.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: July 14, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takayoshi Kawai, Naoto Kato, Naoya Takagi, Yasuhiro Kuze, Teruhiko Miyake, Teppei Yoshioka
  • Patent number: 10639984
    Abstract: A vehicle control system, in which that maintains a reaction force against the backward movement of a vehicle while preventing an overheating of a motor due to phase lock of the motor. When a thermal load on a specific phase of the motor exceeds a threshold value, a controller execute a phase shift control to reduce a thermal load on a specific phase of the motor by changing a rotational angle of the motor, while interrupting torque transmission between the motor and wheels and generating the torque to stop the vehicle by the actuator.
    Type: Grant
    Filed: November 5, 2018
    Date of Patent: May 5, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yasuhiro Kuze, Naoya Takagi, Teruhiko Miyake, Naoto Kato, Takayoshi Kawai, Teppei Yoshioka
  • Patent number: 10544713
    Abstract: A control device is configured, if, although the control device has caused a cam switching device to perform a first cam switching operation for switching the profiles of all the valve-driving cams of a plurality of cylinders from a first profile to a second profile, the profiles of all the valve-driving cams of the plurality of cylinders do not coincide with the second profile, to cause the cam switching device to perform a second cam switching operation for switching the profile of the valve-driving cam for at least one or more normal cylinders that are one or more cylinders at which the switching of profiles to the second profile has succeeded.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: January 28, 2020
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shinji Sadakane, Hiroyuki Sugihara, Noriyasu Adachi, Keisuke Sasaki, Shigehiro Sugihira, Takayoshi Kawai, Kaoru Ohtsuka
  • Patent number: 10513950
    Abstract: Provided is a control device for an internal combustion engine equipped with a cam switching device including a cam groove provided on the outer peripheral surface of a camshaft and an electromagnetic solenoid type actuator capable of protruding, toward the camshaft, an engagement pin that is engageable with the cam groove. The control device is configured, in causing the cam switching device to perform a cam switching operation, to perform energization of the actuator such that the engagement pin is seated on a forward outer peripheral surface, and to more lower, when an electric current (coil current) flowing through the actuator as a result of the energization is greater, an average electric voltage per unit time applied to the actuator in protruding the engagement pin toward the cam groove from the forward outer peripheral surface.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: December 24, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Noriyasu Adachi, Keisuke Sasaki, Shigehiro Sugihira, Takayoshi Kawai, Shinji Sadakane, Hiroyuki Sugihara, Kaoru Ohtsuka
  • Patent number: 10502154
    Abstract: An electronic control unit of a control device for an internal combustion engine executes, for a first cycle, first drive processing for controlling an actuator such that a pin drive operation is executed for switching from a first cam to a second cam, executes second drive processing for controlling the actuator such that the pin drive operation is executed again for a second cycle, and executes abnormality determination processing for determining that a cam switching mechanism has an abnormality in a case where a pin returns to a reference position by using a pin return section following a cam switching section of the first cycle after the execution of the first drive processing and the pin returns to the reference position by using the pin return section following the cam switching section of the second cycle after the execution of the second drive processing.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: December 10, 2019
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Keisuke Sasaki, Noriyasu Adachi, Shigehiro Sugihira, Takayoshi Kawai, Shinji Sadakane, Kaoru Otsuka
  • Patent number: 10465573
    Abstract: In a system that selects a large-cam as a driving cam at a time of a start of an engine, when an engine stop request is output, it is determined whether there is a small-cam cylinder for which a small-cam is selected as the driving cam. In a case where it is determined that there is a small-cam cylinder, a switching command for switching the driving cam from the small-cam to the large-cam is output. When an engine start request is output, the above determination is performed again. In a case where it is determined that there is a small-cam cylinder, the switching command is output to all solenoid actuators again. In addition, the drive of the fuel injector is suspended until the switching operation of the driving cam is completed for all cylinders.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: November 5, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shigehiro Sugihira, Noriyasu Adachi, Keisuke Sasaki, Takayoshi Kawai, Kaoru Otsuka, Shinji Sadakane, Hiroyuki Sugihara
  • Publication number: 20190263249
    Abstract: An engine starting system for starting an engine promptly during propulsion without reducing a drive force. When a condition to crank the engine is satisfied during propulsion in a neutral stage, torque is applied to an input rotary element to crank the engine by reducing a rotational speed of a control rotary element by increasing a torque capacity of a first engagement device to utilize an inertial force of the free rotary element as a reaction force.
    Type: Application
    Filed: January 31, 2019
    Publication date: August 29, 2019
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takayoshi KAWAI, Naoto Kato, Naoya Takagi, Yasuhiro Kuze, Teruhiko Miyake, Teppei Yoshioka
  • Publication number: 20190226412
    Abstract: A control device for an internal combustion engine is configured, where a designated cam switching condition is met, to execute a boost pressure control processing and an air amount control processing. In the boost pressure control processing, the control device controls a boost pressure control device such that a boost pressure control parameter does not increase in synchronization with execution of a cam switching operation and decreases in accordance with an increase of a required engine torque after the execution of the cam switching operation. In the air amount control processing, the control device controls the opening degree of a throttle valve to its closed side in synchronization with the cam switching operation such that a difference of an in-cylinder charge air amount is not produced before and after the execution of the cam switching operation.
    Type: Application
    Filed: November 26, 2018
    Publication date: July 25, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shigehiro Sugihira, Noriyasu Adachi, Keisuke Sasaki, Takayoshi Kawai
  • Patent number: 10344638
    Abstract: An internal combustion engine system is provided with a cam switching device including a cam groove provided on the outer peripheral surface or a camshaft and an actuator capable of protruding, toward the camshaft, an engagement pin that is engageable with the cam groove. The internal combustion engine system is configured, in causing the cam switching device to perform a cam switching operation, to control the actuator such that the engagement pin is seated on a forward outer peripheral surface which is located more forward than an end of the cam groove on the forward side with respect to an insert section of the cam groove in the rotational direction of the camshaft.
    Type: Grant
    Filed: January 8, 2018
    Date of Patent: July 9, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keisuke Sasaki, Noriyasu Adachi, Shigehiro Sugihira, Takayoshi Kawai, Shinji Sadakane, Hiroyuki Sugihara, Kaoru Ohtsuka
  • Patent number: 10329962
    Abstract: At crank angle CA10 at which the switch request of the drive cam was issued, the ejection operations of the pins at all the solenoid actuators started simultaneously. The ejected pins are seated on the cam carriers at crank angle CA12. The pin seated on the cam carrier moves along the grooves in accordance with the rotation of the cam carrier. The earliest finish timing of the switch operation of the drive cam is at crank angle CA13 (#4 cylinder). At the crank angle CA13, drive of the fuel injector and the ignition device in each cylinder is permitted.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: June 25, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takayoshi Kawai, Noriyasu Adachi, Shigehiro Sugihira, Keisuke Sasaki, Kaoru Otsuka, Shinji Sadakane, Hiroyuki Sugihara
  • Patent number: 10294835
    Abstract: When a stop request to the engine is issued, it is determined whether or not all of the drive cams are large cams. When it is determined that at least one of the small cams is included in the drive cams, the engine is continued to drive for a while and a switch control for switching the drive cams from the small cams to the large cams is executed within the duration. A self-holding type solenoid is used to switch between the small cams and the large cams. In the switch control, a permission to stop the engine is output at a timing when the “pin protrudable section” of the final cylinder #2 has elapsed.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: May 21, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kaoru Ohtsuka, Hiroyuki Sugihara, Shinji Sadakane, Noriyasu Adachi, Shigehiro Sugihara, Keisuke Sasaki, Takayoshi Kawai
  • Publication number: 20190135103
    Abstract: A vehicle control system, in which that maintains a reaction force against the backward movement of a vehicle while preventing an overheating of a motor due to phase lock of the motor. When a thermal load on a specific phase of the motor exceeds a threshold value, a controller execute a phase shift control to reduce a thermal load on a specific phase of the motor by changing a rotational angle of the motor, while interrupting torque transmission between the motor and wheels and generating the torque to stop the vehicle by the actuator.
    Type: Application
    Filed: November 5, 2018
    Publication date: May 9, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yasuhiro KUZE, Naoya TAKAGI, Teruhiko MIYAKE, Naoto KATO, Takayoshi KAWAI, Teppei YOSHIOKA