Patents by Inventor Keisuke Kawai

Keisuke 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).

  • Publication number: 20240132049
    Abstract: A control apparatus for a rotating electric machine is provided. The rotating electric machine includes a moving portion that applies torque to a drive shaft of an internal combustion engine. The control apparatus acquires a rotational frequency signal that is a signal that changes depending on a rotational frequency of the moving portion per unit time. The control apparatus calculates a damping torque that is applied from the moving portion to the drive shaft to suppress vibration during operation of the internal combustion engine. The control apparatus calculates the damping torque based on the rotational frequency signal acquired by the signal acquiring unit in response to the rotating electric machine performing cranking of the internal combustion engine.
    Type: Application
    Filed: December 29, 2023
    Publication date: April 25, 2024
    Applicant: DENSO CORPORATION
    Inventors: Syuya KAMIZONO, Akira Sakamoto, Yuichi Handa, Masaki Amakawa, Keisuke Kawai
  • Publication number: 20240123834
    Abstract: A control device includes a switching control unit, an information acquisition unit, and a difference acquisition unit. The switching control unit performs switching control that increases braking torque of the braking device while decreasing braking torque of the rotating electrical machine, when a vehicle is decelerated. The information acquisition unit acquires information on a state of the vehicle. The difference acquisition unit acquires a braking torque difference indicating a difference between braking torque required for keeping a stopped state of the vehicle and braking torque of the braking device, when the vehicle is stopped. After the information acquisition unit detects the stopped state of the vehicle, the switching control unit corrects output torque of the rotating electrical machine based on the braking torque difference.
    Type: Application
    Filed: December 15, 2023
    Publication date: April 18, 2024
    Applicant: DENSO CORPORATION
    Inventors: Haibo LIU, Keisuke Kawai, Akira Sakamoto, Shigeru Kamio, Tatsuya Takagi
  • Publication number: 20240120805
    Abstract: A rotating electrical machine includes a stator equipped with a stator winding, a rotor arranged to face the stator, a housing in which the stator and the rotor are disposed, and a coolant supply unit. The coolant supply unit is located vertically above the stator and the rotor in the housing in a condition where the rotating electrical machine is mounted in place. The coolant supply unit works to deliver liquid coolant into the housing. A coolant guide is provided to direct the coolant, as supplied from the coolant supply unit, into an air gap between the stator and the rotor in the housing.
    Type: Application
    Filed: December 20, 2023
    Publication date: April 11, 2024
    Applicant: DENSO CORPORATION
    Inventors: Masaki AMAKAWA, Yuichi HANDA, Keisuke KAWAI, Syuya KAMIZONO, Akira SAKAMOTO
  • Patent number: 11939068
    Abstract: In a hybrid flight vehicle, having multiple rotors attached to a frame, a gas turbine engine to drive the rotors; a generator connected to the gas engine to generate electric power, a battery store the electrical power generated by the generator. multiple first electric motors connected to the rotors to drive the same by the electric power supplied from the battery, a second electric motor connected to the gas turbine engine to motor the engine by the electric power supplied from the battery and a control unit to control flight, wherein the control unit stops supply of the fuel to the engine when a detected residual of the battery is equal to or greater than a predetermined value, and supplies electric power to the second electric motor to motor the engine when a detected temperature of the engine is equal to or higher than a predetermined temperature.
    Type: Grant
    Filed: October 22, 2019
    Date of Patent: March 26, 2024
    Assignee: Honda Motor Co., Ltd.
    Inventor: Keisuke Kawai
  • Publication number: 20240043012
    Abstract: A friction-coefficient-computing device includes: a computing unit that calculates a slip ratio and a friction coefficient; and a maximum-friction-estimating unit that calculates an estimated maximum value of the friction. The maximum-friction-estimating unit includes: a model calculator that calculates a tire model friction, which is a friction coefficient of a tire brush model; and a parameter-estimating unit that estimates values of parameters of a tire brush model expression. The parameter-estimating unit includes a parameter-restricting unit that eliminates values of the parameters that allow the tire brush model expression to be a linear function and a quadratic function, and obtains values of the parameters that allow an inclination of an inflection point of the tire brush model expression to approach zero.
    Type: Application
    Filed: July 27, 2023
    Publication date: February 8, 2024
    Inventors: MITSUYASU ABE, KEISUKE KAWAI, SHIGERU KAMIO, HAIBO LIU
  • Publication number: 20240003291
    Abstract: In a motor-generator configured to use no flywheel connection to an internal combustion engine, an inner stator is provided. An outer rotor is arranged to surround the inner stator. The outer rotor is connected to the internal combustion engine without a flywheel and is configured to reduce noise due to at least one of torque ripples of the internal combustion engine and rotational fluctuations of the motor-generator.
    Type: Application
    Filed: September 14, 2023
    Publication date: January 4, 2024
    Applicant: DENSO CORPORATION
    Inventors: Akira SAKAMOTO, Keisuke KAWAI, Yuichi HANDA, Syuya KAMIZONO
  • Publication number: 20230408731
    Abstract: The present invention relates to a transparent substrate with a multilayer film including: a transparent substrate having two main surfaces; and a multilayer film obtained by laminating at least two or more layers having refractive indices different from each other, and disposed on or above at least one main surface of the transparent substrate, in which the multilayer film includes one or more silicon oxide layers, and at least one layer of the one or more silicon oxide layers has a refractive index of 1.460?n<1.478 at a wavelength of 550 nm.
    Type: Application
    Filed: August 24, 2023
    Publication date: December 21, 2023
    Applicant: AGC Inc.
    Inventors: Keisuke KAWAI, Kaname SETO, Katsumi SUZUKI, Tomoyuki ARAE, Kazuya TAKEMOTO
  • Publication number: 20230366361
    Abstract: A control apparatus for a motor generator that is connected to an internal combustion engine. The control apparatus estimates an estimated torque pulsation that is an estimation value of torque pulsation of the internal combustion engine. The control apparatus controls the motor generator to reduce generated power and suppress decrease in a rotation speed of the internal combustion engine, when a negative torque that obstructs rotation of the internal combustion engine is generated in the estimated torque pulsation of the internal combustion engine.
    Type: Application
    Filed: July 26, 2023
    Publication date: November 16, 2023
    Applicant: DENSO CORPORATION
    Inventors: Akira SAKAMOTO, Keisuke KAWAI, Yuichi HANDA, Syuya KAMIZONO
  • Publication number: 20230365002
    Abstract: A control apparatus includes an operation control unit; a first torque command value setting unit that sets a required torque command value; a second torque command value setting unit that sets a vehicle-stop torque command value; and a waveform setting unit that sets a torque waveform. The operation control unit controls the output torque of the rotary electric machine along the torque waveform when changing the output torque of the rotary electric machine. The waveform setting unit utilizes a first torque waveform and subsequently utilizes a second torque waveform as the torque waveform, the first torque waveform being capable of attenuating a vibration of the vehicle in a pitch direction, the second torque waveform being capable of suppressing a vibration in a power transmission member provided in a power transmission system for transmitting a torque of the rotary is electric machine to wheels.
    Type: Application
    Filed: July 20, 2023
    Publication date: November 16, 2023
    Applicant: DENSO CORPORATION
    Inventors: Haibo LIU, Keisuke KAWAI, Akira SAKAMOTO, Tatsuya TAKAGI, Shigeru KAMIO
  • Publication number: 20230331092
    Abstract: A control device for a vehicle includes an operation controller that controls operations of a rotating electric machine mounted to the vehicle, a first torque detector that detects a traveling torque which is a braking/driving torque to be output from the rotating electric machine when the vehicle is traveling, a second torque detector that detects a standstill torque which is a braking/driving torque to be output from the rotating electric machine upon the vehicle coming to a stop, and a waveform setter that sets a stop waveform which is a waveform indicating a time variation in the braking/driving torque output from the rotating electric machine from the traveling torque to the standstill torque. The operation controller performs a stop process that is a process to bring the vehicle to a stop while changing the braking/driving torque output from the rotating electric machine in accordance with the stop waveform.
    Type: Application
    Filed: June 23, 2023
    Publication date: October 19, 2023
    Applicant: DENSO CORPORATION
    Inventors: Haibo LIU, Keisuke KAWAI, Akira SAKAMOTO, Tatsuya TAKAGI, Shigeru KAMIO
  • Publication number: 20230229037
    Abstract: An anti-reflective film-attached transparent substrate includes: a transparent substrate including two major surfaces; and a diffusion layer and an anti-reflective film on one major surface of the transparent substrate, which are provided in this order. (A) A luminous reflectance SCI Y of an outermost surface of the anti-reflective film-attached transparent substrate is 1% or lower. (B) The anti-reflective film has a lamination structure in which at least two dielectric layers having different refractive indices are laminated. (C) A ratio (SCE Y)/(SCI Y) of a diffuse reflectance SCE Y of the outermost surface of the anti-reflective film-attached transparent substrate to the luminous reflectance SCI Y of the outermost surface of the anti-reflective film-attached transparent substrate is 0.15 or higher.
    Type: Application
    Filed: January 18, 2023
    Publication date: July 20, 2023
    Applicant: AGC Inc.
    Inventors: Kazuya TAKEMOTO, Keisuke KAWAI, Teruo FUJIWARA, Hideaki TAKAHOSHI
  • Patent number: 11634230
    Abstract: In a hybrid flight vehicle, having four rotors attached to a frame and configured to produce propelling force to propel the frame, a gas turbine engine attached to the frame and configured to rotate when fuel is supplied, a generator connected to an output shaft of the engine and configured to generate electric power when driven by the engine, a battery configured to store the electrical power generated by the generator, and four first electric motors each connected to the rotors to drive associated one of the rotors when the electric power is supplied from the battery, and an electronic control unit configured to control flight by regulating driving of the four rotors by the first electric motors. In the vehicle, the output shaft of the engine is attached parallel to at least one among yaw axis, pitch axis and roll axis of the frame.
    Type: Grant
    Filed: October 22, 2019
    Date of Patent: April 25, 2023
    Assignee: Honda Motor Co., Ltd.
    Inventor: Keisuke Kawai
  • Publication number: 20230103350
    Abstract: An optical filter including: a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate as an outermost layer, in which: the dielectric multilayer film is a laminate including a low refractive index film and a high refractive index film laid on each other; the low refractive index film or the high refractive index film satisfies the spectral characteristics (i-1) and (i-2); the optical filter satisfies all of the spectral characteristics (ii-1) to (ii-3); and the optical filter has a nanoindentation hardness of 5.5 GPa or higher when a measurement load is 1 mN.
    Type: Application
    Filed: September 16, 2022
    Publication date: April 6, 2023
    Applicant: AGC Inc.
    Inventors: Hideaki TAKAHOSHI, Kazuya TAKEMOTO, Keisuke KAWAI
  • Patent number: 11577713
    Abstract: A method for controlling a hybrid vehicle including a battery charged with electric power generated by an engine, including a motor as a drive source, and having multiple running modes that can be selected through a mode operation, the running modes including a normal mode configured to perform charging of the battery according to a running state, and a charge mode configured to perform electric power generation by the engine according to a mode operation, the method comprising: setting a range of charge amount that allows for charging of the battery based on the electric power generated; and setting an upper limit of the range of charge amount in the charge mode to be lower than an upper limit of the range of charge amount in the normal mode.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: February 14, 2023
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shinsuke Higuchi, Hidekatsu Akiyama, Azusa Kobayashi, Keisuke Kawai
  • Publication number: 20230039431
    Abstract: An optical filter including: a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate as an outermost layer, in which: the dielectric multilayer film is a laminate including a low refractive index film and a plurality of high refractive index films laid on each other; the dielectric multilayer film comprises four or more high refractive index films that are 15 nm or smaller in thickness; the high refractive index films have a minimum thickness of 1.5 to 5 nm; the high refractive index films have a minimum thickness of 100 nm or smaller; the high refractive index films satisfy the following spectral characteristics (i-1) and (i-2); and the optical filter satisfies all of the following spectral characteristics (ii-1) to (ii-4).
    Type: Application
    Filed: July 26, 2022
    Publication date: February 9, 2023
    Applicants: AGC Inc., Optical Coatings Japan
    Inventors: Hideaki TAKAHOSHI, Kazuya TAKEMOTO, Keisuke KAWAI, Masaaki MIYAKE
  • Patent number: 11529944
    Abstract: A control method for a hybrid vehicle including a generator and an electric motor, the generator being configured to charge a battery by use of power of an engine, the electric motor being configured to drive driving wheels by electric power of the battery, is provided, is provided. The control method having controlling the generator and the electric motor and accepting mode setting to set any of a normal mode, a regeneration driving mode, and a silent mode, the regeneration driving mode being a mode in which a regenerative braking force caused by the electric motor is larger than that in the normal mode, the silent mode being a mode in which charging by the engine is inhibited, wherein: when the normal mode is set, setting of the silent mode is not accepted; and when the regeneration driving mode is set, setting of the silent mode is accepted.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: December 20, 2022
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shinsuke Higuchi, Hidekatsu Akiyama, Azusa Kobayashi, Keisuke Kawai
  • Patent number: 11518363
    Abstract: A method for controlling a hybrid vehicle includes an engine, a battery charged with electric power generated by the engine, and a motor as a drive source and having multiple running modes that can be selected through a mode operation. As the running mode, the method for controlling a hybrid vehicle includes a normal mode configured to perform charging of the battery according to a running state; and a charge mode configured to electric power generation by the engine according to a mode operation, the method comprising setting an upper limit of charging electric power based on the generated electric power in the charge mode to be lower than an upper limit of charging electric power based on the generated electric power in the normal mode.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: December 6, 2022
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shinsuke Higuchi, Hidekatsu Akiyama, Azusa Kobayashi, Keisuke Kawai
  • Patent number: 11465500
    Abstract: A display method for a hybrid vehicle includes displaying an engine icon representing the engine, a battery icon representing the battery, and a flow icon representing an energy flow between the engine icon and the battery icon on a display unit in accordance with a driving state of the hybrid vehicle. The display method includes displaying the flow icon in a display mode indicating that there is the energy flow between the engine and the battery when the battery is charged. The display method includes displaying the engine icon in a first display mode when the engine is stopped, displaying the engine icon in a second display mode when the engine is operated at engine rotation speed equal to or lower than reference rotation speed, and displaying the engine icon in a third display mode when the engine rotation speed is higher than the reference rotation speed.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: October 11, 2022
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shinsuke Higuchi, Kazuma Sengoku, Keisuke Kawai, Ryuji Kurosaki
  • Patent number: 11285937
    Abstract: A catalyst warm-up control method for a hybrid vehicle supplies electric power to an electric motor by a battery, to charge the battery by a power generation engine, and to treat exhaust gas from the engine with a catalyst, the hybrid vehicle selecting a manner mode in which power generation using the engine is stopped. The catalyst warm-up control method performs catalyst warm-up control such that when the temperature of the catalyst becomes lower than a normal threshold temperature for activating the catalyst, the target rotation speed of the engine is controlled to a first warm-up required rotation speed at which the catalyst can be heated to a temperature that is higher than the normal threshold temperature. When the manner mode is selected, control is performed when temperature of the catalyst becomes lower than a manner mode threshold temperature that is equal to or less than the normal threshold temperature.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: March 29, 2022
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shinsuke Higuchi, Hidekatsu Akiyama, Azusa Kobayashi, Keisuke Kawai, Takashi Kamijo, Tsuyoshi Ishikawa
  • Publication number: 20210213934
    Abstract: A method for controlling a hybrid vehicle includes an engine, a battery charged with electric power generated by the engine, and a motor as a drive source and having multiple running modes that can be selected through a mode operation. As the running mode, the method for controlling a hybrid vehicle includes a normal mode configured to perform charging of the battery according to a running state; and a charge mode configured to electric power generation by the engine according to a mode operation, the method comprising setting an upper limit of charging electric power based on the generated electric power in the charge mode to be lower than an upper limit of charging electric power based on the generated electric power in the normal mode.
    Type: Application
    Filed: December 15, 2017
    Publication date: July 15, 2021
    Inventors: Shinsuke Higuchi, Hidekatsu Akiyama, Azusa Kobayashi, Keisuke Kawai