Patents by Inventor Kazuhito Hayashi

Kazuhito Hayashi 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: 10766416
    Abstract: To provide an alarm system for a vehicle that can appropriately raise an alarm to a driver of a vehicle that is entering an intersection. An alarm system 1 for a vehicle includes an alarm line setting part 51 that sets a right alarm line 61 and a left alarm line 62 both extending forward from a vehicle 2. The alarm line setting part 51 sets the length of the right alarm line 61 and the left alarm line 62 at L1 when the vehicle is running in a straight line. The alarm line setting part 51 sets the length of the right alarm line 61 or the left alarm line 62 at a length different from L1 when the vehicle 2 is to turn left or right at an intersection 83 to enter a first lane 81 or a second lane 82.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: September 8, 2020
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Toshiki Yoshihara, Koji Hirai, Yoshitsugu Hanada, Kazuhito Hayashi, Koji Kagami, Hiromichi Nomura, Kazuya Maruoka, Yuki Okamoto, Yuki Yoshida
  • Patent number: 10744939
    Abstract: To provide an alarm system for a vehicle that can reduce alarms that can irritate a driver. An alarm system 1 for a vehicle includes an alarm line setting part 51 that sets a right alarm line 61 and a left alarm line 62 in front of a vehicle 2, and an alarm unit control part 55 that activates a speaker 41 and a display 42 when the velocity of the vehicle 2 is equal to or less than a predetermined velocity and a collision determination part 53 determines that an object will cross the right alarm line 61 or the left alarm line 62 within a predetermined time. When the vehicle 2 is decelerating, the alarm unit control part 55 performs an alarm reduction control that suppresses operation of the speaker 41 compared with when the vehicle 2 is not decelerating.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: August 18, 2020
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Toshiki Yoshihara, Yoshitsugu Hanada, Kazuhito Hayashi, Koji Kagami, Hiromichi Nomura, Kazuya Maruoka, Yuki Okamoto, Yuki Yoshida
  • Patent number: 10723233
    Abstract: A controller of an electrically powered vehicle includes an electronic control unit. The electronic control unit performs a switching control by a square wave control in a first switching mode when a rotation speed of the motor is equal to or higher than a first predetermined rotation speed. The electronic control unit performs the switching control by the square wave control in a second switching mode when the rotation speed of the motor is lower than the first predetermined rotation speed. The first predetermined rotation speed is a rotation speed lower than a first resonance region. The first switching mode is a mode of a switching pattern that suppresses LC resonance in the first resonance region. The second switching mode is a mode of a switching pattern that suppresses LC resonance in a second resonance region lower than the first predetermined rotation speed.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: July 28, 2020
    Assignee: DENSO CORPORATION
    Inventors: Yoshihiro Shamoto, Kazuhito Hayashi, Hiroyuki Oyanagi
  • Publication number: 20200195100
    Abstract: A control apparatus is provided for controlling drive of a rotating electric machine that has coils of two or more phases. The control apparatus includes a first inverter to be connected with first ends of the coils, a second inverter to be connected with second ends of the coils, and a controller. The first inverter has a plurality of first switching elements each corresponding to one of the coils. The second inverter has a plurality of second switching elements each corresponding to one of the coils. The controller includes a first operation circuit configured to generate a first control signal for control of the first inverter and a second operation circuit configured to generate a second control signal for control of the second inverter. Moreover, the control apparatus is configured so that switching timings are synchronized, based on synchronization information, between the first and second inverters.
    Type: Application
    Filed: February 27, 2020
    Publication date: June 18, 2020
    Applicant: DENSO CORPORATION
    Inventors: Ryuji OMATA, Hirofumi KAKO, Kiyotaka MATSUBARA, Kazuhito HAYASHI, Makoto NAKAMURA
  • Publication number: 20190366925
    Abstract: To provide an alarm system for a vehicle that can reduce alarms that can irritate a driver. An alarm system 1 for a vehicle includes an alarm line setting part 51 that sets a right alarm line 61 and a left alarm line 62 in front of a vehicle 2, and an alarm unit control part 55 that activates a speaker 41 and a display 42 when the velocity of the vehicle 2 is equal to or less than a predetermined velocity and a collision determination part 53 determines that an object will cross the right alarm line 61 or the left alarm line 62 within a predetermined time. When the vehicle 2 is decelerating, the alarm unit control part 55 performs an alarm reduction control that suppresses operation of the speaker 41 compared with when the vehicle 2 is not decelerating.
    Type: Application
    Filed: May 13, 2019
    Publication date: December 5, 2019
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Toshiki Yoshihara, Yoshitsugu Hanada, Kazuhito Hayashi, Koji Kagami, Hiromichi Nomura, Kazuya Maruoka, Yuki Okamoto, Yuki Yoshida
  • Publication number: 20190366924
    Abstract: To provide an alarm system for a vehicle that can appropriately raise an alarm to a driver of a vehicle that is entering an intersection. An alarm system 1 for a vehicle includes an alarm line setting part 51 that sets a right alarm line 61 and a left alarm line 62 both extending forward from a vehicle 2. The alarm line setting part 51 sets the length of the right alarm line 61 and the left alarm line 62 at L1 when the vehicle is running in a straight line. The alarm line setting part 51 sets the length of the right alarm line 61 or the left alarm line 62 at a length different from L1 when the vehicle 2 is to turn left or right at an intersection 83 to enter a first lane 81 or a second lane 82.
    Type: Application
    Filed: May 13, 2019
    Publication date: December 5, 2019
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Toshiki YOSHIHARA, Koji HIRAI, Yoshitsugu HANADA, Kazuhito HAYASHI, Koji KAGAMI, Hiromichi NOMURA, Kazuya MARUOKA, Yuki OKAMOTO, Yuki YOSHIDA
  • Publication number: 20190248248
    Abstract: A controller of an electrically powered vehicle includes an electronic control unit. The electronic control unit performs a switching control by a square wave control in a first switching mode when a rotation speed of the motor is equal to or higher than a first predetermined rotation speed. The electronic control unit performs the switching control by the square wave control in a second switching mode when the rotation speed of the motor is lower than the first predetermined rotation speed. The first predetermined rotation speed is a rotation speed lower than a first resonance region. The first switching mode is a mode of a switching pattern that suppresses LC resonance in the first resonance region. The second switching mode is a mode of a switching pattern that suppresses LC resonance in a second resonance region lower than the first predetermined rotation speed.
    Type: Application
    Filed: February 7, 2019
    Publication date: August 15, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshihiro SHAMOTO, Kazuhito HAYASHI, Hiroyuki OYANAGI
  • Publication number: 20190214907
    Abstract: The boost system performs switching control of a first switching element and a second switching element, based on a result of comparison between the boost carrier and a duty command based on a required duty, with regard to each of a decreasing region where the boost carrier decreases and an increasing region where the boost carrier increases. The boost system sets the required duty to the duty command, with regard to the greater between the required duty in the decreasing region and the required duty in the increasing region, while setting the duty command by imposing a limitation on the required duty by lower limit guarding, such that an average duty in each one period of the boost carrier becomes equal to or greater than a lower limit duty, with regard to the smaller between the required duty in the decreasing region and the required duty in the increasing region.
    Type: Application
    Filed: January 9, 2019
    Publication date: July 11, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Toshifumi YAMAKAWA, Ryo KAMIKAWA, Kazuhito HAYASHI, Kota OGURA, Koji IRIE
  • Patent number: 10181808
    Abstract: When an electrical primary frequency of power fluctuation of a motor is smaller than a determination threshold value fth1 that is a lower limit frequency of a frequency band where resonance occurs in a circuit including a reactor and a capacitor of a boosting converter or greater than a determination threshold value that is an upper limit frequency of the frequency band where resonance occurs, a value G2 is set as a gain G and when the electrical primary frequency is equal to or greater than the determination threshold value fth1 and equal to or smaller than the determination threshold value, a value G3 at which the upper limit frequency of the resonant frequency band has a low frequency than the determination threshold value fth1 is set as the gain G, and a current control in the boosting converter is executed using the gain G set in this way. The resonance of the circuit including the reactor and the capacitor of the boosting converter can be prevented.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: January 15, 2019
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kojiro Asakawa, Kazuhito Hayashi, Daigo Nobe
  • Patent number: 9647547
    Abstract: The present invention is intended to discriminate between a battery voltage sensor and the input voltage sensor of a converter for abnormality, without stopping the step-up operation of the converter. A voltage conversion device is provided with a battery, a converter, a battery voltage sensor, a voltage sensor for detecting the input voltage of the converter, a current sensor for detecting a reactor current, and a control unit. The control unit determines the abnormality of the battery voltage sensor or the input voltage sensor on the basis of an estimated value of input voltage calculated based on the reactor current, the input voltage of the converter and a battery voltage, without stopping the step-up operation of the converter.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: May 9, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daigo Nobe, Ryoji Sato, Kazuhito Hayashi
  • Publication number: 20170066332
    Abstract: When an electrical primary frequency of power fluctuation of a motor is smaller than a determination threshold value fth1 that is a lower limit frequency of a frequency band where resonance occurs in a circuit including a reactor and a capacitor of a boosting converter or greater than a determination threshold value that is an upper limit frequency of the frequency band where resonance occurs, a value G2 is set as a gain G and when the electrical primary frequency is equal to or greater than the determination threshold value fth1 and equal to or smaller than the determination threshold value, a value G3 at which the upper limit frequency of the resonant frequency band has a low frequency than the determination threshold value fth1 is set as the gain G and a current control in the boosting converter is executed using the gain G set in this way. The resonance of the circuit including the reactor and the capacitor of the boosting converter can be prevented.
    Type: Application
    Filed: August 26, 2016
    Publication date: March 9, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kojiro ASAKAWA, Kazuhito HAYASHI, Daigo NOBE
  • Patent number: 9242642
    Abstract: An inverter performs bidirectional DC/AC power conversion between a power line and a second MG so as to control an output torque of the second MG for generating vehicle driving force. A PM-ECU sets a torque command value of the second MG such that requested driving force for an entire vehicle is exerted on a drive shaft. An MG-ECU estimates, based on a rotation speed of the second MG, a magnitude of a drag torque acting as rotational resistance when the second MG rotates at zero torque, and stops the inverter in accordance with a difference between the estimated drag torque and the torque command value.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: January 26, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhito Hayashi, Mikio Yamazaki
  • Patent number: 9166516
    Abstract: An ECU sets target value of a system voltage based on an electric power loss of a motor generator and an inverter and controls a voltage boost converter. The ECU calculates the target value of the system voltage using a function expression generated, for each operating point of the motor generator, by approximating a loss characteristic which represents change of the electric power loss with respect to change of the system voltage, by a quadratic expression or a linear expression of the system voltage.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: October 20, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhito Hayashi, Hideto Hanada
  • Publication number: 20150263624
    Abstract: The present invention is intended to discriminate between a battery voltage sensor and the input voltage sensor of a converter for abnormality, without stopping the step-up operation of the converter. A voltage conversion device is provided with a battery, a converter, a battery voltage sensor, a voltage sensor for detecting the input voltage of the converter, a current sensor for detecting a reactor current, and a control unit. The control unit determines the abnormality of the battery voltage sensor or the input voltage sensor on the basis of an estimated value of input voltage calculated based on the reactor current, the input voltage of the converter and a battery voltage, without stopping the step-up operation of the converter.
    Type: Application
    Filed: March 12, 2015
    Publication date: September 17, 2015
    Inventors: Daigo NOBE, Ryoji SATO, Kazuhito HAYASHI
  • Publication number: 20150108929
    Abstract: A power controller includes a boost converter, an inverter, and a control unit controlling the output voltage of the boost converter and the carrier frequency of the inverter. The control unit includes a carrier frequency reducing program which reduces the carrier frequency to an LC resonance upper limit frequency while maintaining a set value of the output voltage of the boost converter at a system loss minimization voltage at the time of reduction of the carrier frequency from the set frequency, and a voltage varying program which changes the carrier frequency to a first varied frequency calculated based on a first predetermined temperature or lower and the temperatures of the respective switching elements, and changes the set value of the output voltage of the boost converter to a voltage at which the LC resonance upper limit frequency becomes the first varied frequency.
    Type: Application
    Filed: July 23, 2014
    Publication date: April 23, 2015
    Inventors: Daigo Nobe, Ryoji Sato, Kazuhito Hayashi
  • Publication number: 20140297085
    Abstract: An inverter performs bidirectional DC/AC power conversion between a power line and a second MG so as to control an output torque of the second MG for generating vehicle driving force. A PM-ECU sets a torque command value of the second MG such that requested driving force for an entire vehicle is exerted on a drive shaft. An MG-ECU estimates, based on a rotation speed of the second MG, a magnitude of a drag torque acting as rotational resistance when the second MG rotates at zero torque, and stops the inverter in accordance with a difference between the estimated drag torque and the torque command value.
    Type: Application
    Filed: October 27, 2011
    Publication date: October 2, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhito Hayashi, Mikio Yamazaki
  • Publication number: 20140139156
    Abstract: An ECU sets target value of a system voltage based on an electric power loss of a motor generator and an inverter and controls a voltage boost converter. The ECU calculates the target value of the system voltage using a function expression generated, for each operating point of the motor generator, by approximating a loss characteristic which represents change of the electric power loss with respect to change of the system voltage, by a quadratic expression or a linear expression of the system voltage.
    Type: Application
    Filed: June 30, 2011
    Publication date: May 22, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhito Hayashi, Hideto Hanada
  • Patent number: 8581533
    Abstract: A controller controls switching of IGBT devices of an inverter according to the desired output of the permanent magnet motor. The controller includes: a magnet temperature detection device that detects the magnet temperature of the permanent magnet motor based on the output of a temperature sensor; a setting device that sets a threshold value of the magnet temperature corresponding to the desired output of the permanent magnet motor, based on a predetermined relation between the output from the permanent magnet motor and a critical temperature, up to which demagnetization in the permanent magnet motor is not caused; and a carrier frequency control device that, when the magnet temperature detected by the magnet temperature detection device exceeds the threshold value, changes the carrier frequency, at which the IGBT devices are switched, such that a ripple current superimposed on a motor current that flows through the permanent magnet motor is reduced.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: November 12, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazuhito Hayashi, Masayoshi Suhama
  • Publication number: 20130253749
    Abstract: A hybrid vehicle generates vehicle driving force by the sum of a direct torque mechanically transmitted directly from an engine to a drive shaft through a power split device and an output torque of an MG. A PM-ECU selectively applies a running mode in which outputs of the engine and the MG are controlled such that the requested driving force for the entire vehicle is exerted on the drive shaft; and an S/D mode in which the requested driving force is exerted on the drive shaft by the direct torque in the state where the output torque of the MG is set at zero. An MG-ECU stops the operation of a power converter for controlling the output of the MG when the S/D mode is applied.
    Type: Application
    Filed: December 27, 2010
    Publication date: September 26, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhito Hayashi, Mikio Yamazaki, Kazunobu Eritate
  • Patent number: 8482234
    Abstract: A motor drive control device includes a battery, a converter, an inverter, and a control section for outputting control signals to the converter and the inverter. The control section has a first map and a second map regarding control of the alternating-current motor and further includes a map switching section for switching from control based on the first map to control based on the second map in accordance with conditions of the battery.
    Type: Grant
    Filed: January 23, 2009
    Date of Patent: July 9, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Toshifumi Yamakawa, Hideto Hanada, Kazuhito Hayashi, Masayoshi Suhama