Patents by Inventor Keita Hashimoto

Keita Hashimoto 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: 20130324363
    Abstract: A hybrid vehicle (100) in which at least two shift ranges can be selected for a single running direction includes an engine (160), a motor generator (135), an EHC (180) raising the temperature of a catalyst for cleaning up an exhaust gas from the engine (160), and an ECU (300). While the vehicle (100) is running, if the engine (160) is stopped and, of the two shift ranges, a shift range where larger decelerating force is produced by regenerative braking of the motor generator (135) has been selected, the ECU (300) causes the EHC (180) to raise the temperature of the catalyst using electric power generated by the motor generator (135).
    Type: Application
    Filed: February 16, 2011
    Publication date: December 5, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Keita Hashimoto
  • Publication number: 20130305692
    Abstract: A vehicle includes: an engine; an EHC (electrically heated catalyst) electrically heated for purifying exhaust gas of the engine; a temperature sensor for sensing the temperature of the EHC; and an ECU that controls the EHC in temperature. The ECU performs a first estimation process and a second estimation process to estimate the temperature of the EHC and accordingly controls electric power applied to energize the EHC, the first estimation process being performed to estimate the temperature of the EHC based on an output of the temperature sensor before the engine starts, the second estimation process being performed to estimate the temperature of the EHC based on the temperature of the exhaust gas emitted by the engine after the engine is started.
    Type: Application
    Filed: February 1, 2011
    Publication date: November 21, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Keita Hashimoto
  • Patent number: 8490740
    Abstract: A vehicle includes a PCU serving as a power control unit controlling the electric power for vehicle running, a battery storing the electric power for vehicle running, and an EHC serving as an electrically heated catalyst. The PCU includes a converter, an inverter, and a positive line and a negative line each connecting the converter and the inverter. The converter boosts a voltage VL output from the battery to a requested voltage value VHsys. The EHC has a positive end connected to the positive line. The EHC also has a negative end connected to the negative line.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: July 23, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Keita Hashimoto, Katsumi Tsuchida, Yasuharu Terada
  • Patent number: 8437898
    Abstract: In a vehicle control for a vehicle that includes: an internal combustion engine; a vehicle-driving rotary electric machine that generates drive force on a drive wheel; and an electricity storage device that supplies electric power to the vehicle-driving rotary electric machine, the internal combustion engine includes an exhaust passageway, a catalyst provided in the exhaust passageway, and a heater device that heats the catalyst by using electric power from the electricity storage device. The vehicle control includes determining whether an execution condition that a state of the drive wheel is changing between a slipping state and a gripped state is satisfied; and executing a control for causing the electric power generated by the vehicle-driving rotary electric machine to be consumed by the heater device if the execution condition is satisfied.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: May 7, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Keita Hashimoto
  • Publication number: 20120323419
    Abstract: A vehicle includes: a catalyst device configured to be electrically heatable for purifying exhaust gas of an internal combustion engine; a first temperature detection unit for detecting the temperature of the catalyst device; a state-of-charge detection unit for detecting the state of charge of a power storage device; a second temperature detection unit for detecting the temperature of the power storage device; a catalyst power supply device supplying the catalyst device with electric power for heating it; and a controller. The controller calculates first electric power that the power storage device can supply based on the state of charge of the power storage device and an output of the second temperature detection unit, and the controller determines according to an output of the first temperature detection unit whether to cause the catalyst power supply device to supply the catalyst device with the first electric power.
    Type: Application
    Filed: March 10, 2010
    Publication date: December 20, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Keita Hashimoto
  • Publication number: 20120125705
    Abstract: A vehicle includes a PCU serving as a power control unit controlling the electric power for vehicle running, a battery storing the electric power for vehicle running, and an EHC serving as an electrically heated catalyst. The PCU includes a converter, an inverter, and a positive line and a negative line each connecting the converter and the inverter. The converter boosts a voltage VL output from the battery to a requested voltage value VHsys. The EHC has a positive end connected to the positive line. The EHC also has a negative end connected to the negative line.
    Type: Application
    Filed: March 16, 2010
    Publication date: May 24, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keita Hashimoto, Katsumi Tsuchida, Yasuharu Terada
  • Publication number: 20110307132
    Abstract: In a vehicle control for a vehicle that includes: an internal combustion engine; a vehicle-driving rotary electric machine that generates drive force on a drive wheel; and an electricity storage device that supplies electric power to the vehicle-driving rotary electric machine, the internal combustion engine includes an exhaust passageway, a catalyst provided in the exhaust passageway, and a heater device that heats the catalyst by using electric power from the electricity storage device. The vehicle control includes determining whether an execution condition that a state of the drive wheel is changing between a slipping state and a gripped state is satisfied; and executing a control for causing the electric power generated by the vehicle-driving rotary electric machine to be consumed by the heater device if the execution condition is satisfied.
    Type: Application
    Filed: June 1, 2011
    Publication date: December 15, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Keita HASHIMOTO
  • Patent number: 7518331
    Abstract: Solving Means: A field coil current and a stator current are controlled by a controller. The stator current is controlled under vector control and is controlled so that the phase keeps an efficient motor zone. In a case of rated power generation, when the motor speed is low, the phase current and field coil current are increased to reserve the generated power. And, as the speed is increased, the phase current is decreased to reduce the copper loss, while in place of decreasing the phase current, the field coil current is kept high to reserve the generated power. Thereafter, as the speed is increased more, the field coil current is decreased to reduce the iron loss, while in place of decreasing the field coil current, the phase current is increased to reserve the generated power.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: April 14, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Shinichi Fujino, Toshiyuki Innami, Keita Hashimoto
  • Patent number: 7310001
    Abstract: A current sensing device for sensing current flowing through a MOSFET has a voltage divider circuit composed of a series circuit of a first resistor and a second resistor having different resistance temperature coefficients, with a voltage division ratio designed to change depending on temperature. The sensing device is connected between a source and a drain of said MOSFET. A sensing circuit takes out the source-to-drain voltage divided with the voltage divider to sense the current flowing through the MOSFET.
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: December 18, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Satoru Shigeta, Shinichi Fujino, Keita Hashimoto, Sadashi Seto
  • Publication number: 20070229050
    Abstract: A power converter having a high side switching device and a low side switching device that are connected in series between a positive power supply terminal and a negative side power supply terminal for direct current, the connection point between the high side switching device and the low side switching device being set as an output terminal, and each of the high side switching device and the low side switching device being constructed by a switching device to which a current mirror device is appended, further including a high side current detecting unit for detecting current flowing in the current mirror device of the high side switching device, and a low side current detecting unit for detecting current flowing in the current mirror device of the low side switching device. A signal detected by the high side current detecting unit and a signal detected by the low side current detecting unit are differentiated from each other and set as a current value of the output terminal.
    Type: Application
    Filed: February 27, 2007
    Publication date: October 4, 2007
    Applicant: HITACHI, LTD.
    Inventors: Satoru Shigeta, Shinichi Fujino, Keita Hashimoto, Sadashi Seto
  • Publication number: 20060202324
    Abstract: A semiconductor power module has insulative substrate which is configured with a metal wiring pattern formed on an upper first surface thereof, a metal conductor formed on a rear face, opposite the first surface and an insulative layer between the metal wiring pattern and the metal conductor. A semiconductor chip is joined to the metal wiring pattern formed on the first surface of the insulative substrate, using Pb-free solder with a low melting point. A heat sink is bonded to the metal conductor formed on the other surface of the insulative substrate, using a highly heat conductive adhesive having a thermal conductivity of 2 W/(mK) or more.
    Type: Application
    Filed: February 7, 2006
    Publication date: September 14, 2006
    Applicant: Hitachi, Ltd.
    Inventors: Keita Hashimoto, Tokihito Suwa, Sadashi Seto, Satoru Shigeta, Shinichi Fujino
  • Patent number: 7064515
    Abstract: In a power converter, an overvoltage suppression function of low cost and high reliability is provided. The power converter has a power conversion circuit, when driving a motor, for converting power from a battery and supplying it to the motor and when the motor generates power, converting the generated power of the motor and supplying it to the battery for storage of electricity and a drive circuit for driving the power conversion circuit. The power conversion circuit includes a plurality of paired switching elements, in which one of each paired switching elements is arranged on an upper arm, and the other is arranged on a lower arm, and each pair corresponds to each phase of the motor. The drive circuit, when the voltage applied to the power conversion circuit is increased, turns on all the switching elements on one arm, turns off all the switching elements on the other arm, thereby short-circuits the output terminals of the motor.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: June 20, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Shinichi Fujino, Keita Hashimoto, Toshiyuki Innami, Masanori Tsuchiya
  • Publication number: 20060103409
    Abstract: A current sensing device for sensing current flowing through a MOSFET has a voltage divider circuit composed of a series circuit of a first resistor and a second resistor having different resistance temperature coefficients, with a voltage division ratio designed to change depending on temperature. The sensing device is connected between a source and a drain of said MOSFET. A sensing circuit takes out the source-to-drain voltage divided with the voltage divider to sense the current flowing through the MOSFET.
    Type: Application
    Filed: August 19, 2005
    Publication date: May 18, 2006
    Applicant: Hitachi, Ltd.
    Inventors: Satoru Shigeta, Shinichi Fujino, Keita Hashimoto, Sadashi Seto
  • Publication number: 20050242759
    Abstract: Solving Means: A field coil current and a stator current are controlled by a controller. The stator current is controlled under vector control and is controlled so that the phase keeps an efficient motor zone. In a case of rated power generation, when the motor speed is low, the phase current and field coil current are increased to reserve the generated power. And, as the speed is increased, the phase current is decreased to reduce the copper loss, while in place of decreasing the phase current, the field coil current is kept high to reserve the generated power. Thereafter, as the speed is increased more, the field coil current is decreased to reduce the iron loss, while in place of decreasing the field coil current, the phase current is increased to reserve the generated power.
    Type: Application
    Filed: April 29, 2005
    Publication date: November 3, 2005
    Applicant: Hitachi, Ltd.
    Inventors: Shinichi Fujino, Toshiyuki Innami, Keita Hashimoto
  • Publication number: 20050077863
    Abstract: In a power converter, an overvoltage suppression function of low cost and high reliability is provided. The power converter has a power conversion circuit, when driving a motor, for converting power from a battery and supplying it to the motor and when the motor generates power, converting the generated power of the motor and supplying it to the battery for storage of electricity and a drive circuit for driving the power conversion circuit. The power conversion circuit includes a plurality of paired switching elements, in which one of each paired switching elements is arranged on an upper arm, and the other is arranged on a lower arm, and each pair corresponds to each phase of the motor. The drive circuit, when the voltage applied to the power conversion circuit is increased, turns on all the switching elements on one arm, turns off all the switching elements on the other arm, thereby short-circuits the output terminals of the motor.
    Type: Application
    Filed: October 12, 2004
    Publication date: April 14, 2005
    Inventors: Shinichi Fujino, Keita Hashimoto, Toshiyuki Innami, Masanori Tsuchiya
  • Publication number: 20050001582
    Abstract: The invention is intended to provide a control device for a vehicular AC motor, which has higher efficiency of voltage utilization in a power running mode and has higher efficiency of electricity generation in an electricity generation mode. The motor control device comprises rectifying devices and switching devices for three phases, which are connected between a DC power source and armature coils of an AC motor operatively coupled to an internal combustion engine. The motor control device has the inverter function of converting a DC power from the DC power source into an AC power and supplying the AC power to the armature coils, and the converter function of converting an AC power generated by the AC motor into a DC power and supplying the DC power to the DC power source.
    Type: Application
    Filed: April 9, 2004
    Publication date: January 6, 2005
    Inventors: Kosei Goto, Toshiyuki Innami, Shinichi Fujino, Yoshimi Sakurai, Masamitsu Inaba, Masahiro Iwamura, Shinji Shirakawa, Junichi Sakano, Keita Hashimoto, Masanori Tsuchiya