Patents by Inventor Hiroyuki Ashizawa

Hiroyuki Ashizawa 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: 20240097582
    Abstract: Provided is a vibration-driven energy harvesting device that can enhance the power generation efficiency of the vibration-driven energy harvesting device even in a case where vibration is changed. The vibration-driven energy harvesting device includes a vibration-driven energy harvesting element that generates power in accordance with vibration of an electrode; an output unit that supplies the power generated by the vibration-driven energy harvesting element to a load resistor once being connected to the load resistor; and an adjustment unit that adjusts an input impedance of the output unit in accordance with a signal corresponding to an acceleration in the vibration.
    Type: Application
    Filed: October 15, 2021
    Publication date: March 21, 2024
    Inventors: Hiroyuki Mitsuya, Hisayuki Ashizawa
  • Publication number: 20240025409
    Abstract: A driving support method and a driving support device set a timing to start an own vehicle based on an elapsed time from a stop of the own vehicle to a start of a preceding vehicle existing in front of the own vehicle, wherein the timing in case that the elapsed time is long is later than the timing in case that the elapsed time is short, and start the own vehicle at the set timing by following the preceding vehicle.
    Type: Application
    Filed: August 28, 2020
    Publication date: January 25, 2024
    Inventors: Hiroyuki Ashizawa, Masahiro Kobayashi
  • Publication number: 20230294697
    Abstract: When accelerating a vehicle toward a set speed after the vehicle travels on a curved road at a vehicle speed equal to or lower than a speed limit based on the curved road, a driving support method and a driving support device accelerate the vehicle by a first acceleration in a case of acquiring a curve information related to the curved road, and accelerate the vehicle by a second acceleration smaller than the first acceleration in a case of not acquiring the curve information.
    Type: Application
    Filed: August 20, 2020
    Publication date: September 21, 2023
    Inventors: Hiroyuki Ashizawa, Masahiro Kobayashi
  • Patent number: 10731757
    Abstract: The controller performs shift control of the transmission such that an actual pressure of a primary pressure becomes an indicating pressure. The controller includes a phase advance compensator which performs advance compensation of the indicating pressure, and a setting unit which sets an indicating pressure on which the advance compensation is performed by the phase advance compensator as the indicating pressure, in accordance with at least one of a rotation speed of a primary pulley, an input torque to a secondary pulley, a speed ratio, or a changing rate.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: August 4, 2020
    Assignee: JATCO LTD
    Inventors: Takurou Kawasumi, Ken Okahara, Midori Yamaguchi, Masahiro Yamamoto, Hiroki Iwasa, Hiroki Kumashiro, Masayuki Shimizu, Ryuuichi Furukawa, Kenichi Mori, Kazutaka Adachi, Yutaka Kaneko, Hiroyuki Ashizawa
  • Publication number: 20190078685
    Abstract: The controller performs shift control of the transmission such that an actual pressure of a primary pressure becomes an indicating pressure. The controller includes a phase advance compensator which performs advance compensation of the indicating pressure, and a setting unit which sets an indicating pressure on which the advance compensation is performed by the phase advance compensator as the indicating pressure, in accordance with at least one of a rotation speed of a primary pulley, an input torque to a secondary pulley, a speed ratio, or a changing rate.
    Type: Application
    Filed: February 27, 2017
    Publication date: March 14, 2019
    Applicant: JATCO Ltd
    Inventors: Takurou KAWASUMI, Ken OKAHARA, Midori YAMAGUCHI, Masahiro YAMAMOTO, Hiroki IWASA, Hiroki KUMASHIRO, Masayuki SHIMIZU, Ryuuichi FURUKAWA, Kenichi MORI, Kazutaka ADACHI, Yutaka KANEKO, Hiroyuki ASHIZAWA
  • Patent number: 9623867
    Abstract: A hybrid vehicle clutch control device includes an engine, a motor generator, a first clutch, a second clutch and at least one controller. The first clutch interrupts a torque transmission between the engine and the motor generator. The second clutch interrupts the torque transmission between the motor generator and driving wheels. The controller starts the engine using torque from the motor generator, when switching from an electric vehicle mode to a hybrid mode. When starting the engine accompanying an accelerator depression, the allocation of the transmission torque capacity of the second clutch is increased when the accelerator position opening amount is equal to or less than a predetermined accelerator position opening amount, as compared to when exceeding the predetermined accelerator position opening amount.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: April 18, 2017
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Hiroyuki Ashizawa, Yutaka Takamura
  • Publication number: 20160272192
    Abstract: A hybrid vehicle clutch control device includes an engine, a motor generator, a first clutch, a second clutch and at least one controller. The first clutch interrupts a torque transmission between the engine and the motor generator. The second clutch interrupts the torque transmission between the motor generator and driving wheels. The controller starts the engine using torque from the motor generator, when switching from an electric vehicle mode to a hybrid mode. When starting the engine accompanying an accelerator depression, the allocation of the transmission torque capacity of the second clutch is increased when the accelerator position opening amount is equal to or less than a predetermined accelerator position opening amount, as compared to when exceeding the predetermined accelerator position opening amount.
    Type: Application
    Filed: April 3, 2014
    Publication date: September 22, 2016
    Inventors: Hiroyuki ASHIZAWA, Yutaka TAKAMURA
  • Patent number: 9321456
    Abstract: Provided is a control device for a hybrid vehicle, capable of suppressing a drive torque variation during engine start control. The hybrid vehicle has an engine (Eng) and a motor/generator (MG). The control device has: an engine start control part that performs engine start control to start the engine (Eng) from an EV mode by increasing a motor rotation speed of the motor/generator (MG), while allowing slippage of a second clutch (CL2), and bringing a first clutch (CL1) into slip engagement; and a drive torque upper limit setting part (600) that sets a drive torque upper limit value (Tdrlim) in the EV mode based on an added motor rotation speed (Nad), which is given by adding an additional rotation speed (N+) to the motor rotation speed (Nmot), as an upper limit of a drive torque transmitted to drive wheels through the second clutch CL2.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: April 26, 2016
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Yutaka Takamura, Hiroyuki Ashizawa, Munetoshi Ueno
  • Patent number: 9267481
    Abstract: When there is a requirement on switching from the electrically driven drive mode to the hybrid drive mode by changing an accelerator position opening, the torque capacity is generated for the first clutch to start the engine. However, as torque capacity is at ?1, the engine rotational speed is quickly increased to the high-speed region free of the influence of the compressive reactive force of the engine; once the engine rotational speed becomes the high-speed region, the engine rotational speed is decreased as torque capacity and is at ?2. Consequently, it is possible to quickly pass through the low engine rotational speed region as the engine rotational speed torque is increased under the influence of the compressive reactive force, and avoiding the poor acceleration, as can be seen from the smooth variation of the time sequence increase of the transmission output rotational speed as indicated by ?3, is possible.
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: February 23, 2016
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yutaka Takamura, Yoshinori Yamamura, Hiroyuki Ashizawa, Jun Amemiya
  • Publication number: 20150329104
    Abstract: Provided is a control device for a hybrid vehicle, capable of suppressing a drive torque variation during engine start control. The hybrid vehicle has an engine (Eng) and a motor/generator (MG). The control device has: an engine start control part that performs engine start control to start the engine (Eng) from an EV mode by increasing a motor rotation speed of the motor/generator (MG), while allowing slippage of a second clutch (CL2), and bringing a first clutch (CL1) into slip engagement; and a drive torque upper limit setting part (600) that sets a drive torque upper limit value (Tdrlim) in the EV mode based on an added motor rotation speed (Nad), which is given by adding an additional rotation speed (N+) to the motor rotation speed (Nmot), as an upper limit of a drive torque transmitted to drive wheels through the second clutch CL2.
    Type: Application
    Filed: November 21, 2013
    Publication date: November 19, 2015
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Yutaka TAKAMURA, Hiroyuki ASHIZAWA, Munetoshi UENO
  • Patent number: 9057424
    Abstract: A traction transmission capacity control device includes a one-direction turning-stop-position detecting means configured to detect a position at which the turning of a second roller stops after a second-roller turning means starts to turn the second roller in one direction; an another-direction turning-stop-position detecting means configured to detect a position at which the turning of the second roller stops after the second-roller turning means starts to turn the second roller in another direction; and a second-roller turning-motion reference-point setting means configured to set a center position between the position detected by the one-direction turning-stop-position detecting means and the position detected by the another-direction turning-stop-position detecting means, as a turning-motion reference point of the second roller.
    Type: Grant
    Filed: May 10, 2010
    Date of Patent: June 16, 2015
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Eigo Sakagami, Hideo Iwamoto, Hiroyuki Ashizawa, Kenichi Mori
  • Patent number: 8897944
    Abstract: Provided herein is a vehicle drive force control. When a driver requests to start the vehicle with the brake OFF and depresses the accelerator pedal, a target drive torque exceeds a gradient load. To avoid excess current being supplied to the motor, the upper limit of motor speed, which is the input speed of a second clutch, is set to a value less than a slip detectable limit value at which it becomes possible to detect slip rotation, i.e. the difference over the output side rotation speed. When the target drive torque exceeds the gradient load, the lower limit of the input speed of the second clutch (the motor speed) is set to a value equal to or greater than the slip detectable limit value so that the required driving force can be achieved by the gradient load corresponding driving force control.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: November 25, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yutaka Takamura, Hiroshi Arita, Haruhisa Tsuchikawa, Hiroki Shimoyama, Hiroyuki Ashizawa
  • Patent number: 8825253
    Abstract: A hybrid vehicle control device is provided that is capable of achieving stable input torque control and torque capacity control of the clutch. When transitioning between a slip drive mode, in which the vehicle travels by controlling the rotation speed of the drive source and controlling the slip state of a starting clutch, and an engagement drive mode, in which the vehicle travels by controlling the torque of the drive source and completely engaging the starting clutch, the torque of the inertia component of the drive source side is deducted from the target drive torque set on the basis of the acceleration opening degree set as the starting clutch transfer torque capacity in the slip state.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: September 2, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yutaka Takamura, Hiroyuki Ashizawa, Haruhisa Tsuchikawa
  • Patent number: 8798836
    Abstract: A control device is provided to reduce an engine start shock when there is a request to start the engine in response to the accelerator pedal depression and the slip polarity of the second clutch is negative. The control device for a hybrid vehicle has an engine, a motor/generator, a first clutch, a second clutch, and a mechanism for an engine start permission controlling operation. The first clutch is selectively engaged during engine start in which the motor generator is operated as the starter motor. The second clutch is interposed between the motor/generator and tires, and is slip-engaged when the engine is started. The mechanism for the engine start permission controlling operation delays starting the engine until the slip polarity becomes positive when the engine start request is produced and the slip polarity of the second clutch is negative.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: August 5, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yutaka Takamura, Hiroyuki Ashizawa, Kaori Tanishima
  • Publication number: 20140195082
    Abstract: A hybrid vehicle control device is provided that is capable of achieving stable input torque control and torque capacity control of the clutch. When transitioning between a slip drive mode, in which the vehicle travels by controlling the rotation speed of the drive source and controlling the slip state of a starting clutch, and an engagement drive mode, in which the vehicle travels by controlling the torque of the drive source and completely engaging the starting clutch, the torque of the inertia component of the drive source side is deducted from the target drive torque set on the basis of the acceleration opening degree set as the starting clutch transfer torque capacity in the slip state.
    Type: Application
    Filed: October 20, 2011
    Publication date: July 10, 2014
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Yutaka Takamura, Hiroyuki Ashizawa, Haruhisa Tsuchikawa
  • Patent number: 8694189
    Abstract: Provided is an electrically driven vehicle, wherein unexpected vibration or shock is prevented during interruption of torque transmission. An electric vehicle having an electric motor as its power source is provided with an F/F calculation or operation unit, an F/B calculation or operation unit, an adder, model determination units, and target torque value switching units. The F/F calculation unit calculates a first target torque value by F/F operation. The F/B calculation unit calculates a second target torque value by F/B operation using a model. The adder adds the first target torque value and the second target torque value, to obtain a motor torque command value. The model determination units evaluate whether or not an interruption in the torque transmission to drive shafts occurs. The target torque value switching units stop the F/F- and F/B operations while torque transmission interruption is confirmed.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: April 8, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Jun Motosugi, Satoru Fujimoto, Hiroyuki Ashizawa
  • Publication number: 20130297128
    Abstract: When there is a requirement on switching from the electrically driven drive mode to the hybrid drive mode by changing an accelerator position opening, the torque capacity is generated for the first clutch to start the engine. However, as torque capacity is at ?1, the engine rotational speed is quickly increased to the high-speed region free of the influence of the compressive reactive force of the engine; once the engine rotational speed becomes the high-speed region, the engine rotational speed is decreased as torque capacity and is at ?2. Consequently, it is possible to quickly pass through the low engine rotational speed region as the engine rotational speed torque is increased under the influence of the compressive reactive force, and avoiding the poor acceleration, as can be seen from the smooth variation of the time sequence increase of the transmission output rotational speed as indicated by ?3, is possible.
    Type: Application
    Filed: October 3, 2011
    Publication date: November 7, 2013
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Yutaka Takamura, Yoshinori Yamamura, Hiroyuki Ashizawa, Jun Amemiya
  • Publication number: 20130204479
    Abstract: A control device is provided to reduce an engine start shock when there is a request to start the engine in response to the accelerator pedal depression and the slip polarity of the second clutch is negative. The control device for a hybrid vehicle has an engine, a motor/generator, a first clutch, a second clutch, and a mechanism for an engine start permission controlling operation. The first clutch is selectively engaged during engine start in which the motor generator is operated as the starter motor. The second clutch is interposed between the motor/generator and tires, and is slip-engaged when the engine is started. The mechanism for the engine start permission controlling operation delays starting the engine until the slip polarity becomes positive when the engine start request is produced and the slip polarity of the second clutch is negative.
    Type: Application
    Filed: October 4, 2011
    Publication date: August 8, 2013
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Yutaka Takamura, Hiroyuki Ashizawa, Kaori Tanishima
  • Publication number: 20130184918
    Abstract: Provided is an electrically driven vehicle, wherein unexpected vibration or shock is prevented during interruption of torque transmission. An electric vehicle having an electric motor as its power source is provided with an F/F calculation or operation unit, an F/B calculation or operation unit, an adder, model determination units, and target torque value switching units. The F/F calculation unit calculates a first target torque value by F/F operation. The F/B calculation unit calculates a second target torque value by F/B operation using a model. The adder adds the first target torque value and the second target torque value, to obtain a motor torque command value. The model determination units evaluate whether or not an interruption in the torque transmission to drive shafts occurs. The target torque value switching units stop the F/F- and F/B operations while torque transmission interruption is confirmed.
    Type: Application
    Filed: July 21, 2011
    Publication date: July 18, 2013
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Jun Motosugi, Satoru Fujimoto, Hiroyuki Ashizawa
  • Patent number: 8290656
    Abstract: A controller of electric vehicle includes: sensor sensing vehicle information; torque target value setter; torque command value calculator; first paragraph calculator implementing first filtering treatment of the torque command value, the first filtering treatment including transmission characteristic having hand pass filter characteristic; second paragraph calculator implementing second filtering treatment of motor revolution speed which is one of pieces of the vehicle information, the second filtering treatment including: the transmission characteristic having band pass filter characteristic, and model of a transmission characteristic between: torque input to the vehicle, and the motor revolution speed; torque target value calculator calculating the second torque target value. Based on the first torque target value and the second torque target value, the torque command value calculator calculates the torque command value.
    Type: Grant
    Filed: May 24, 2010
    Date of Patent: October 16, 2012
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Satoru Fujimoto, Takaaki Karikomi, Hiroyuki Ashizawa