Patents by Inventor Yoichi Tajima

Yoichi Tajima 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: 10351002
    Abstract: An inverter control device that controls a rotary electric machine drive device that includes an inverter with a plurality of switching elements, where the active short circuit control is executed in a high rotational speed region, and the shut-down control is executed in a low rotational speed region, which is on a low rotational speed side with respect to the high rotational speed region, in accordance with at least a rotational speed of the rotary electric machine.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: July 16, 2019
    Assignee: AISIN AW CO., LTD.
    Inventors: Subrata Saha, Takashi Yoshida, Yuki Sugiyama, Yoichi Tajima, Masaya Kokubo
  • Patent number: 9919698
    Abstract: A control device for a vehicle driving device which controls the vehicle driving device provided with a particular engagement device, a rotary electric machine, and a transmission apparatus disposed in a power transmission path coupling an internal combustion engine with wheels in order from the internal combustion engine side, wherein the transmission apparatus includes a plurality of engagement devices, and selectively forms a plurality of transmission shift stages different in transmission shift ratio according to a state of engagement of the plurality of engagement devices.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: March 20, 2018
    Assignee: AISIN AW CO., LTD.
    Inventors: Yoichi Tajima, Kohei Tsuda
  • Publication number: 20170305274
    Abstract: An inverter control device that controls a rotary electric machine drive device that includes an inverter with a plurality of switching elements, where the active short circuit control is executed in a high rotational speed region, and the shut-down control is executed in a low rotational speed region, which is on a low rotational speed side with respect to the high rotational speed region, in accordance with at least a rotational speed of the rotary electric machine.
    Type: Application
    Filed: November 13, 2015
    Publication date: October 26, 2017
    Applicant: AISIN AW CO., LTD.
    Inventors: Subrata SAHA, Takashi YOSHIDA, Yuki SUGIYAMA, Yoichi TAJIMA, Masaya KOKUBO
  • Patent number: 9643598
    Abstract: A control device for a vehicle drive device includes performing neutral travel control in which disengagement/engagement elements are disengaged with the wheels rotating so the state of a speed change mechanism is controlled into a neutral state where transfer of a drive force between the input member to the engine and the output member to the wheels is not performed, and the wheels are driven by a rotary electric machine drive force; and comparing an operating state value of each of target actuators that control the state of the disengagement/engagement elements, and a determination value so torque from the speed change mechanism to the wheels because of torque transferred by each of the disengagement/engagement elements, falls within an allowable range during neutral travel control, and determines whether the torque transferred from the speed change mechanism to the wheels falls within the allowable range.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: May 9, 2017
    Assignee: AISIN AW CO., LTD.
    Inventors: Takehiko Suzuki, Yoichi Tajima, Masatoshi Taguchi, Minoru Kubokawa, Tomohiro Kusamizu
  • Publication number: 20160355173
    Abstract: A control device for a vehicle driving device which controls the vehicle driving device provided with a particular engagement device, a rotary electric machine, and a transmission apparatus disposed in a power transmission path coupling an internal combustion engine with wheels in order from the internal combustion engine side, wherein the transmission apparatus includes a plurality of engagement devices, and selectively forms a plurality of transmission shift stages different in transmission shift ratio according to a state of engagement of the plurality of engagement devices.
    Type: Application
    Filed: March 5, 2015
    Publication date: December 8, 2016
    Applicant: AISIN AW CO., LTD.
    Inventors: Yoichi TAJIMA, Kohei TSUDA
  • Patent number: 9446761
    Abstract: A control device that controls a vehicle drive device in which a first engagement device, a rotating electrical machine, a second engagement device, and an output member are sequentially arranged in this order from an input member side on a power transmission path that connects the input member drivingly coupled to an internal combustion engine to the output member drivingly coupled to wheels. The control device controls both the first engagement device and the second engagement device to a slip engaged state, and causes the rotating electrical machine to generate electric power.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: September 20, 2016
    Assignee: AISIN AW CO., LTD.
    Inventors: Yasuhiko Kobayashi, Yoichi Tajima, Yomei Hakumura, Takashi Yoshida, Yuma Mori
  • Publication number: 20160208719
    Abstract: A control device for a vehicular hydraulic pressure supply device that controls the vehicular hydraulic pressure supply device provided with a mechanical oil pump that is driven by an internal combustion engine, an electric oil pump that is driven by an electric motor, and an oil passage that supplies oil discharged from the mechanical oil pump and the electric oil pump to a supply target.
    Type: Application
    Filed: September 19, 2014
    Publication date: July 21, 2016
    Applicant: AISIN AW CO., LTD.
    Inventors: Yutaro KAWATSU, Mitsuru TAKAHASHI, Yoichi TAJIMA
  • Publication number: 20150362066
    Abstract: A control device, wherein, after the ignition is turned on or the vehicular power supply is turned on and before a first change from the parking range to the travel range occurs, the control device supplies oil to a piston hydraulic pressure chamber of the hydraulic pressure type engagement element in a manner such that air in the piston hydraulic pressure chamber of the hydraulic pressure type engagement element is discharged but a torque capacity does not exceed zero.
    Type: Application
    Filed: March 28, 2014
    Publication date: December 17, 2015
    Applicant: AISIN AW CO., LTD.
    Inventors: Masashi KITO, Yuichi SEKI, Yoichi TAJIMA, Yuichiro UMEMOTO, Hiroki SHINTANI
  • Patent number: 9180868
    Abstract: A control device that that performs starting control for an internal combustion engine. A first transition control during which a first engagement device is caused to transition from a disengaged state to a slipping engagement state is started after the starting request for the internal combustion engine is made. A rotational speed control in which the rotary electric machine is controlled such that a rotational speed of the rotary electric machine becomes a target rotational speed is started before the first engagement device transitions from the disengaged state to the slipping engagement state. A rotational speed control is terminated and torque control in which the rotary electric machine is controlled after the first engagement device transitions from the disengaged to the slipping engagement state, and the second engagement device is caused to transition from a direct engagement state to a slipping engagement state after the torque control is started.
    Type: Grant
    Filed: November 22, 2012
    Date of Patent: November 10, 2015
    Assignee: AISIN AW CO., LTD.
    Inventors: Takashi Yoshida, Yomei Hakumura, Yoichi Tajima, Kohei Tsuda
  • Patent number: 9139198
    Abstract: A control device for a vehicle drive device. A start control section executes internal combustion engine start control. A start slip control section executes start slip control of bringing one of the plurality of shift engagement devices into a slip engaged state. An intended engagement device deciding section that decides as an intended engagement device, based on a set determination speed. The intended engagement device deciding section decides as the intended engagement device a special engagement device that is the shift engagement device having been in the direct-coupling engaged state in order to form the reference shift speed, and that is disengaged when a transition is made to a special shift speed on an opposite side of the specific shift speed from the reference shift speed in order of speed ratios of the plurality of shift speeds.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: September 22, 2015
    Assignee: AISIN AW CO., LTD.
    Inventors: Kohei Tsuda, Yoichi Tajima
  • Patent number: 9067592
    Abstract: A control device that controls a vehicle drive device in which a first engagement device, a rotating electrical machine, a second engagement device, and an output member are sequentially arranged in this order from an input member side on a power transmission path that connects the input member drivingly coupled to an internal combustion engine to the output member drivingly coupled to wheels. The control device controls both the first engagement device and the second engagement device to a slip engaged state, and causes the rotating electrical machine to generate electric power.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: June 30, 2015
    Assignee: AISIN AW CO., LTD.
    Inventors: Yasuhiko Kobayashi, Yoichi Tajima, Yomei Hakumura, Takashi Yoshida, Yuma Mori
  • Patent number: 9061681
    Abstract: The present invention relates to a control device that controls a vehicle drive device in which a rotary electric machine is provided in a power transfer path that connects between an internal combustion engine and wheels and in which a first friction engagement device is provided between the internal combustion engine and the rotary electric machine and a second friction engagement device is provided between the rotary electric machine and the wheels.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: June 23, 2015
    Assignee: AISIN AW CO., LTD.
    Inventors: Takashi Yoshida, Yomei Hakumura, Yoichi Tajima, Hideya Kawai
  • Publication number: 20150142233
    Abstract: A control device for a vehicle drive device includes performing neutral travel control in which disengagement/engagement elements are disengaged with the wheels rotating so the state of a speed change mechanism is controlled into a neutral state where transfer of a drive force between the input member to the engine and the output member to the wheels is not performed, and the wheels are driven by a rotary electric machine drive force; and comparing an operating state value of each of target actuators that control the state of the disengagement/engagement elements, and a determination value so torque from the speed change mechanism to the wheels because of torque transferred by each of the disengagement/engagement elements, falls within an allowable range during neutral travel control, and determines whether the torque transferred from the speed change mechanism to the wheels falls within the allowable range.
    Type: Application
    Filed: March 29, 2013
    Publication date: May 21, 2015
    Inventors: Takehiko Suzuki, Yoichi Tajima, Masatoshi Taguchi, Minoru Kubokawa, Tomohiro Kusamizu
  • Patent number: 8942879
    Abstract: A hybrid drive device having an input member drivingly coupled to an internal combustion engine. Control is performed so that motor torque output by the motor produces at least a part of inertia torque needed for rotation change of input-related members during the shifting. The control device limits the motor torque in an inertia phase during the shifting to a set value that has been set to or below a value having a smaller absolute value between values of performance limit torque of the motor at times before and after the shifting, sets a target input rotational speed of the input member during the shifting, and controls the engagement state of the friction engagement elements that control the rotation change of the input-related members in the inertia phase so as to generate the inertia torque calculated from the target input rotational speed in the input-related members.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: January 27, 2015
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Kohei Tsuda, Yoichi Tajima
  • Publication number: 20140371029
    Abstract: A control device that controls a vehicle drive device in which a first engagement device, a rotating electrical machine, a second engagement device, and an output member are sequentially arranged in this order from an input member side on a power transmission path that connects the input member drivingly coupled to an internal combustion engine to the output member drivingly coupled to wheels. The control device controls both the first engagement device and the second engagement device to a slip engaged state, and causes the rotating electrical machine to generate electric power.
    Type: Application
    Filed: September 4, 2014
    Publication date: December 18, 2014
    Inventors: Yasuhiko KOBAYASHI, Yoichi TAJIMA, Yomei HAKUMURA, Takashi YOSHIDA, Yuma MORI
  • Publication number: 20140330469
    Abstract: A control device for a hybrid vehicle performs start control for an internal combustion engine. The start control includes (i) transition control that controls the transition of first and second engagement devices between a direct engagement state, a slip engagement state and a disengaged state, and (ii) rotational speed control that controls rotational speed of a rotary electric machine. The timing of the transition control and rotational speed control reduces the starting time of the internal combustion engine, and/or suppresses transmission of torque shock to wheels when the first engagement device transitions from the slip engagement state to the direct engagement state.
    Type: Application
    Filed: November 28, 2012
    Publication date: November 6, 2014
    Inventors: Takashi Yoshida, Yomei Hakumura, Yoichi Tajima, Jin Izawa
  • Publication number: 20140303825
    Abstract: A hybrid drive device having an input member drivingly coupled to an internal combustion engine. Control is performed so that motor torque output by the motor produces at least a part of inertia torque needed for rotation change of input-related members during the shifting. The control device limits the motor torque in an inertia phase during the shifting to a set value that has been set to or below a value having a smaller absolute value between values of performance limit torque of the motor at times before and after the shifting, sets a target input rotational speed of the input member during the shifting, and controls the engagement state of the friction engagement elements that control the rotation change of the input-related members in the inertia phase so as to generate the inertia torque calculated from the target input rotational speed in the input-related members.
    Type: Application
    Filed: January 25, 2013
    Publication date: October 9, 2014
    Inventors: Kohei Tsuda, Yoichi Tajima
  • Publication number: 20140297089
    Abstract: A control device for a vehicle drive device. A start control section executes internal combustion engine start control. A start slip control section executes start slip control of bringing one of the plurality of shift engagement devices into a slip engaged state. An intended engagement device deciding section that decides as an intended engagement device, based on a set determination speed. The intended engagement device deciding section decides as the intended engagement device a special engagement device that is the shift engagement device having been in the direct-coupling engaged state in order to form the reference shift speed, and that is disengaged when a transition is made to a special shift speed on an opposite side of the specific shift speed from the reference shift speed in order of speed ratios of the plurality of shift speeds.
    Type: Application
    Filed: January 28, 2013
    Publication date: October 2, 2014
    Inventors: Kohei Tsuda, Yoichi Tajima
  • Patent number: 8812184
    Abstract: A control device configured with a vibration reduction necessity determination section that determines whether or not a required drive operation point falls within a reduction necessary range, which is prescribed in advance as a range in which it is necessary to reduce torque vibration transferred from the internal combustion engine to the rotary electric machine. A cancellation control execution determination section that determines whether or not torque vibration cancellation control can be executed in the case where it is determined that the required drive operation point falls within the reduction necessary range. An execution control decision section that decides to execute the torque vibration cancellation control in the case where it is determined that the torque vibration cancellation control can be executed and that decides to execute operation point change control in the case where it is determined that the torque vibration cancellation control cannot be executed.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: August 19, 2014
    Assignee: Aisin Aw Co., Ltd.
    Inventors: Yomei Hakumura, Yoichi Tajima, Hirokazu Kobayashi, Arinori Shimada
  • Patent number: 8812205
    Abstract: A shift control apparatus controlling a stepped transmission. The apparatus is configured with a gear ratio setting unit, and a shift speed change determining unit. A shift speed change predicting unit predicts in advance a change of shift speed by the shift speed change determining unit based on the set gear ratio, a rate of change in the set gear ratio, and an engagement preparation time which is a time needed for engagement preparation of the friction engagement element. A shift control unit controls a hydraulic actuator so that engagement preparation of a friction engagement element to be engaged is performed when a change of shift speed is predicted, and controls the hydraulic actuator so that a hydraulic pressure needed for engaging the friction engagement element is supplied to a hydraulic servo when a change of shift speed is determined by the shift speed change determining unit.
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: August 19, 2014
    Assignee: Aisin AW Co., Ltd.
    Inventors: Kohei Tsuda, Yoichi Tajima, Tomokazu Ito