Patents by Inventor Yoshimitsu Takahashi

Yoshimitsu Takahashi 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: 11535121
    Abstract: An ECU switches a control mode to an HV mode when an SOC decreases to a lower limit during an EV mode. The ECU calculates an evaluation value ?D of high-rate deterioration indicating a deterioration component of a secondary battery due to non-uniformity in salt concentration in a battery. The ECU executes high-rate deterioration inhibiting control when the HV mode is currently selected and when the battery is evaluated as deteriorating based on the evaluation value ?D, the high-rate deterioration inhibiting control being control for increasing the SOC by making a control target of the SOC higher than the lower limit of the SOC. On the other hand, the ECU does not execute the high-rate deterioration inhibiting control when the EV mode is currently selected.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: December 27, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Koji Hokoi, Yu Nakao, Yoshimitsu Takahashi, Yoshihiro Uchida, Kazuki Furuta, Kazuto Roppongi
  • Patent number: 11489475
    Abstract: The present disclosure provides a power conversion apparatus converting a power from a DC power source, supplying the converted power to a rotary electric machine to drive the rotary electric machine. The power conversion apparatus according to the present disclosure includes: a first inverter circuit electrically connected to a first end of each of phase winding, transmitting power between respective phase windings and the DC power source; a second inverter circuit electrically connected to a second end each of phase winding, transmitting power between respective phase windings and the DC power source; and a control unit controlling the first inverter circuit and the second inverter circuit. The control unit is configured to change a total amount of current flowing through respective phase windings depending on a rotational speed of the rotary electric machine.
    Type: Grant
    Filed: April 16, 2021
    Date of Patent: November 1, 2022
    Assignee: DENSO CORPORATION
    Inventors: Yoshimitsu Takahashi, Makoto Taniguchi
  • Patent number: 11130498
    Abstract: A motor vehicle sets a front wheel average rotation speed that is an average rotation speed of left and right front wheels, based on a rotation speed of a first motor, and sets a rear wheel average rotation speed that is an average rotation speed of left and right rear wheels, based on a rotation speed of a second motor. When a difference between the front wheel average rotation speed and the rear wheel average rotation speed is larger than a first reference value, the motor vehicle sets a vehicle body speed, based on the lower between the front wheel average rotation speed and the rear wheel average rotation speed. The motor vehicle compares a difference between the vehicle body speed and the wheel speed of each wheel, with a second reference value and thereby determines whether the wheel idles.
    Type: Grant
    Filed: November 6, 2018
    Date of Patent: September 28, 2021
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Yoshimitsu Takahashi
  • Publication number: 20210297006
    Abstract: In a power converter for converting DC power from a DC power source into AC power and supplying the AC power to a single-phase winding or multi-phase windings, a controller controls first and second inverter circuits and performs first power conversion control to lock open/closed states of switching elements in the second inverter circuit and switch open/closed states of switching elements in the first inverter circuit, and second power conversion control to lock open/closed states of the switching elements in the first inverter circuit and switch open/closed states of the switching elements in the second inverter circuit. The controller is configured to perform either the first power conversion control or the second power conversion control when an effective value of drive current through each winding is less than a threshold, and otherwise switch between the first power conversion control and the second power conversion control.
    Type: Application
    Filed: June 4, 2021
    Publication date: September 23, 2021
    Applicant: DENSO CORPORATION
    Inventors: Yoshimitsu TAKAHASHI, Makoto TANIGUCHI
  • Publication number: 20210234491
    Abstract: The present disclosure provides a power conversion apparatus converting a power from a DC power source, supplying the converted power to a rotary electric machine to drive the rotary electric machine. The power conversion apparatus according to the present disclosure includes: a first inverter circuit electrically connected to a first end of each of phase winding, transmitting power between respective phase windings and the DC power source; a second inverter circuit electrically connected to a second end each of phase winding, transmitting power between respective phase windings and the DC power source; and a control unit controlling the first inverter circuit and the second inverter circuit. The control unit is configured to change a total amount of current flowing through respective phase windings depending on a rotational speed of the rotary electric machine.
    Type: Application
    Filed: April 16, 2021
    Publication date: July 29, 2021
    Applicant: DENSO CORPORATION
    Inventors: Yoshimitsu TAKAHASHI, Makoto TANIGUCHI
  • Patent number: 11050314
    Abstract: In a rotating electric machine, a stator includes a stator core and three phase windings. In the stator core, a plurality of slots arrayed in a circumferential direction are formed. The three phase windings are wound around the stator core. The three phase windings include first, second, and third windings. One end of the first winding is provided further towards an outer side of the stator in a radial direction than a division line that divides the slot into two in the radial direction of the stator. One end of the second winding is provided further towards an inner side of the stator in the radial direction than the division line. One end of the third winding is provided between the one end of the first winding and the one end of the second winding relative to the radial direction of the stator, with at least a single slot therebetween.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: June 29, 2021
    Assignee: DENSO CORPORATION
    Inventors: Yoshimitsu Takahashi, Mitsutaka Ito, Hiroshi Shimizu, Takeshi Endo
  • Patent number: 11007897
    Abstract: A hybrid vehicle includes an engine, a motor generator, a battery, and an ECU (Electronic Control Unit). The ECU is configured to calculate an evaluation value indicating a degree of progress of deterioration of the battery, the deterioration being caused by an imbalance in a salt concentration in the battery, and is configured to execute a high-rate deterioration suppressing control that raises a target SOC (State of Charge) of the battery when the battery is evaluated to be deteriorated in accordance with the evaluation value. The ECU is configured to also raise the target SOC when an actual SOC is increased due to an electric power generation by the motor generator during the execution of the high-rate deterioration suppressing control. The raised target SOC is lower than the increased actual SOC.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: May 18, 2021
    Assignees: Toyota Jidosha Kabushiki Kaisha, DENSO Ten Limited
    Inventors: Yu Nakao, Koji Hokoi, Yoshimitsu Takahashi, Yoshihiro Uchida, Kazuki Furuta, Kazuto Roppongi
  • Patent number: 10790774
    Abstract: A drive system for an electric motor includes a first inverter that includes first switching elements, a second inverter that includes second switching elements, and a control unit that includes a first inverter control calculation section controlling on-off operation of each of the first switching elements based on a first carrier wave and a first modulation wave, a second inverter control calculation section controlling on-off operation of each of the second switching elements based on a second carrier wave and a second modulation wave, and a control synchronization section synchronizing the first carrier wave with the second carrier wave. When a sum of voltages of the first voltage source and the second voltage source is more than a voltage determination threshold, and torque of a rotating electric machine is smaller than a torque determination threshold, the control synchronization section synchronizes the first carrier wave with the second carrier wave.
    Type: Grant
    Filed: June 17, 2019
    Date of Patent: September 29, 2020
    Assignees: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshimitsu Takahashi, Masahito Fujieda, Tetsuya Yamada, Ryuji Omata, Kiyotaka Matsubara, Makoto Nakamura, Daigo Nobe
  • Publication number: 20190386599
    Abstract: A drive system for an electric motor includes a first inverter that includes first switching elements, a second inverter that includes second switching elements, and a control unit that includes a first inverter control calculation section controlling on-off operation of each of the first switching elements based on a first carrier wave and a first modulation wave, a second inverter control calculation section controlling on-off operation of each of the second switching elements based on a second carrier wave and a second modulation wave, and a control synchronization section synchronizing the first carrier wave with the second carrier wave. When a sum of voltages of the first voltage source and the second voltage source is more than a voltage determination threshold, and torque of a rotating electric machine is smaller than a torque determination threshold, the control synchronization section synchronizes the first carrier wave with the second carrier wave.
    Type: Application
    Filed: June 17, 2019
    Publication date: December 19, 2019
    Applicants: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshimitsu TAKAHASHI, Masahito FUJIEDA, Tetsuya YAMADA, Ryuji OMATA, Kiyotaka MATSUBARA, Makoto NAKAMURA, Daigo NOBE
  • Publication number: 20190283624
    Abstract: A vehicle includes an engine, a motor generator, a battery, and an ECU. The ECU is configured to calculate an evaluation value indicating a degree of progress of deterioration of the battery, the deterioration being caused by an imbalance in a salt concentration in the battery, and is configured to execute high-rate deterioration suppressing control that raises a target SOC of the battery when the battery is evaluated to be deteriorated in accordance with the evaluation value. The ECU is configured to also raise the target SOC when an actual SOC is increased due to the electric power generation by the motor generator during the execution of the high-rate deterioration suppressing control. The raised target SOC is lower than the increased actual SOC.
    Type: Application
    Filed: March 12, 2019
    Publication date: September 19, 2019
    Inventors: Yu Nakao, Koji Hokoi, Yoshimitsu Takahashi, Yoshihiro Uchida, Kazuki Furuta, Kazuto Roppongi
  • Publication number: 20190280548
    Abstract: In a rotating electric machine, a stator includes a stator core and three phase windings. In the stator core, a plurality of slots arrayed in a circumferential direction are formed. The three phase windings are wound around the stator core. The three phase windings include first, second, and third windings. One end of the first winding is provided further towards an outer side of the stator in a radial direction than a division line that divides the slot into two in the radial direction of the stator. One end of the second winding is provided further towards an inner side of the stator in the radial direction than the division line. One end of the third winding is provided between the one end of the first winding and the one end of the second winding relative to the radial direction of the stator, with at least a single slot therebetween.
    Type: Application
    Filed: May 28, 2019
    Publication date: September 12, 2019
    Applicant: DENSO CORPORATION
    Inventors: Yoshimitsu TAKAHASHI, Mitsutaka ITO, Hiroshi SHIMIZU, Takeshi ENDO
  • Patent number: 10406936
    Abstract: In a motor vehicle, an accelerator operation amount is changed among a first region, a second region, and a third region. The motor vehicle is configured to perform a first control that applies a braking force to the vehicle when the accelerator operation amount is at least in the first region or in the second region or to perform a second control that applies a smaller braking force to the vehicle than the braking force applied by the first control when the accelerator operation amount is in the first region or in the second region. The motor vehicle is also configured to continue execution of the first control without changing over control to the second control, when an execution request for the second control is given during execution of the first control in the second region of the accelerator operation amount.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: September 10, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshimitsu Takahashi, Yoshikazu Motozono, Tomoya Yamaguchi
  • Publication number: 20190232815
    Abstract: An ECU switches a control mode to an HV mode when an SOC decreases to a lower limit during an EV mode. The ECU calculates an evaluation value ?D of high-rate deterioration indicating a deterioration component of a secondary battery due to non-uniformity in salt concentration in a battery. The ECU executes high-rate deterioration inhibiting control when the HV mode is currently selected and when the battery is evaluated as deteriorating based on the evaluation value ?D, the high-rate deterioration inhibiting control being control for increasing the SOC by making a control target of the SOC higher than the lower limit of the SOC. On the other hand, the ECU does not execute the high-rate deterioration inhibiting control when the EV mode is currently selected.
    Type: Application
    Filed: January 29, 2019
    Publication date: August 1, 2019
    Inventors: Koji Hokoi, Yu Nakao, Yoshimitsu Takahashi, Yoshihiro Uchida, Kazuki Furuta, Kazuto Roppongi
  • Publication number: 20190135297
    Abstract: A motor vehicle sets a front wheel average rotation speed that is an average rotation speed of left and right front wheels, based on a rotation speed of a first motor, and sets a rear wheel average rotation speed that is an average rotation speed of left and right rear wheels, based on a rotation speed of a second motor. When a difference between the front wheel average rotation speed and the rear wheel average rotation speed is larger than a first reference value, the motor vehicle sets a vehicle body speed, based on the lower between the front wheel average rotation speed and the rear wheel average rotation speed. The motor vehicle compares a difference between the vehicle body speed and the wheel speed of each wheel, with a second reference value and thereby determines whether the wheel idles.
    Type: Application
    Filed: November 6, 2018
    Publication date: May 9, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Yoshimitsu TAKAHASHI
  • Patent number: 10099694
    Abstract: A motor vehicle is controlled: during a prescribed transition from an accelerator ON state to an accelerator OFF and brake OFF state, the control unit makes a rear wheel distribution ratio that is a ratio of a torque of the rear wheel to a sum of a torque of the front wheel and the torque of the rear wheel, change to a first prescribed distribution ratio after changing from a value during the accelerator ON state to a second prescribed distribution ratio that is larger than the first prescribed distribution ratio.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: October 16, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Yoshimitsu Takahashi
  • Patent number: 10011260
    Abstract: A hybrid vehicle includes an engine, a motor, a battery and an electronic control unit. The electronic control unit is configured to set a running torque based on a required torque of a drive shaft according to an accelerator opening degree. The electronic control unit is configured to control the engine and the motor such that the running torque is output to the drive shaft. The electronic control unit is configured to limit the power of the engine by use of the running torque or a drive-shaft torque output to the drive shaft as a torque for determination until the torque for determination reaches a torque threshold smaller than the required torque, as compared with the power of the engine after the torque for determination has reached the torque threshold, when a predetermined acceleration request is made by a user.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: July 3, 2018
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Yoshimitsu Takahashi
  • Patent number: 9873209
    Abstract: A mixer vehicle provided with a mixer drum mounted on a vehicle, the mixer drum being adapted to load uncured concrete includes a driving device for rotating the mixer drum and a loaded state detector for detecting whether the uncured concrete is loaded on the mixer drum or not. Rotation of the mixer drum by the driving device is stopped if the vehicle is in the stop state and the loaded state detector detects that the uncured concrete is not loaded on the mixer drum.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: January 23, 2018
    Assignee: KYB Corporation
    Inventor: Yoshimitsu Takahashi
  • Publication number: 20180001787
    Abstract: In a motor vehicle, an accelerator operation amount is changed among a first region, a second region, and a third region. The motor vehicle is configured to perform a first control that applies a braking force to the vehicle when the accelerator operation amount is at least in the first region or in the second region or to perform a second control that applies a smaller braking force to the vehicle than the braking force applied by the first control when the accelerator operation amount is in the first region or in the second region. The motor vehicle is also configured to continue execution of the first control without changing over control to the second control, when an execution request for the second control is given during execution of the first control in the second region of the accelerator operation amount.
    Type: Application
    Filed: June 19, 2017
    Publication date: January 4, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshimitsu TAKAHASHI, Yoshikazu MOTOZONO, Tomoya YAMAGUCHI
  • Patent number: 9827874
    Abstract: A vehicle includes a front-wheel/rear-wheel motor, a battery and an ECU. The ECU is configured to (i) control the front-wheel/rear-wheel motors, and (ii) control the front-wheel/rear-wheel motors such that a braking torque of a resonance-side motor, when at least one of the rotation speed of the front-wheel/rear-wheel motors is within a resonance range, is smaller than the braking torque of the resonance-side motor, when the rotation speed of the front-wheel/rear-wheel motors are outside the resonance range, and such that the braking torque of a non-resonance-side motor, when at least one of the rotation speed of the front-wheel/rear-wheel motors is within a resonance range, is larger than the braking torque of the non-resonance-side motor, when the rotation speed of the front-wheel/rear-wheel motors are outside the resonance range, during deceleration caused by a braking torque from the front-wheel/rear-wheel motors.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: November 28, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Yoshimitsu Takahashi
  • Patent number: 9758148
    Abstract: When a basic creep torque Tctmp is a positive value and a braking torque demand Trb* is a negative value, the control procedure sets a basic reflection rate Rctmp based on the braking torque demand Trb* (S240). In a state of non-activation of vehicle distance control (S250), the control procedure sets a target reflection rate Rc* using the basic reflection rate Rctmp directly (S230). In a state of activation of vehicle distance control (S250), the control procedure sets the target reflection rate Rc* using a guarded reflection rate Rcgd obtained by guarding the lower limit of the basic reflection rate Rctmp with a previous value of the target reflection rate (previous Rc*) in a previous cycle (S270 and S280).
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: September 12, 2017
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Yoshimitsu Takahashi