Patents by Inventor Kohei Itoh

Kohei Itoh 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: 7816874
    Abstract: In a four-wheel drive vehicle, front wheels 14L and 14R are driven by an engine 1, and rear wheels 15L and 15R are driven by an electric motor 5. A high-power alternator 2 is driven by the engine 1, and electric power generated from the alternator 2 drives the motor 5. In addition to controlling the power generation of the high-power alternator 2 and the driving of the motor 5, a 4WD CU 100 estimates an induced voltage E of the motor 5 from a voltage MHV of the motor and from an output current Ia of the high-power alternator, and estimates a rotating speed Nm of the motor from estimation results on the induced voltage E.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: October 19, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Norikazu Matsuzaki, Masaru Ito, Shin Fujiwara, Yuuichirou Takamune, Kohei Itoh
  • Patent number: 7800053
    Abstract: Provided are a method of evaluating an ion irradiation effect, a process simulator and a device simulator, which allow the influence of ion irradiation on atoms making up a substrate to be evaluated with high accuracy. The method includes irradiating a sample with a beam of ions, and evaluating influence of the ions used for the irradiation on atoms making up the sample, provided that the sample is prepared by alternately and periodically stacking a plurality of thin film layers, and of the plurality of thin film layers, the layer of at least one kind is composed of an isotope layer.
    Type: Grant
    Filed: March 19, 2007
    Date of Patent: September 21, 2010
    Assignee: Keio University
    Inventors: Kohei Itoh, Yasuo Shimizu
  • Publication number: 20100114447
    Abstract: The invention is to provide an automobile and a control device for the automobile, which permits to obtain a driving performance or a braking performance close to their limits achievable on the concerned road face even such as on a compacted snow road and a frozen road. In the control device for the automobile for controlling a driving torque and/or a braking torque for wheels of the automobile, when a slip rate of the wheels is kept in a range smaller than a value where a friction coefficient between the wheels and the road face maximizes, and when a command for increasing the driving torque or the braking torque is input to the control device, the driving torque or the braking torque is controlled by selectively using a first control mode for gradually increasing the driving torque or the braking torque or a second control mode for gradually decreasing the driving torque or the braking torque in response to a slip condition.
    Type: Application
    Filed: January 15, 2008
    Publication date: May 6, 2010
    Applicant: Hitach, Ltd.
    Inventors: Hidekazu Moriki, Shinya Imura, Norikazu Matsuzaki, Kohei Itoh, Shin Fujiwara
  • Patent number: 7663336
    Abstract: In a control apparatus for a vehicle having an electric motor for driving the wheels of the vehicle, an electric power source for energizing the electric motor, a motor torque target value calculation unit for controlling the electric power source, and a field current target value calculation unit, the motor field current is momentarily decreased when the difference between the actual motor armature current and the motor armature current target value exceeds a predetermined value or when the wheels are deemed to slip, and the motor field current is increased as the actual armature current of the motor substantially follows the motor armature current target value.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: February 16, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Moriki, Shinya Imura, Norikazu Matsuzaki, Kohei Itoh, Masaru Ito
  • Patent number: 7650216
    Abstract: A differentiator calculates the acceleration of the rear wheels. An acceleration threshold calculation means enable the skid-detection acceleration threshold to be adjusted corresponding to the conditions of the vehicle. An acceleration skid-detection means make a comparison between the acceleration of the wheels obtained by the differentiator and the skid-detection acceleration threshold adjusted by the acceleration threshold calculation means, and determine whether or not a skid of the wheels has occurred, based upon the comparison result. Such an arrangement provides a vehicle driving force system having a function of detecting a skid even in a case that a skid of the wheels has occurred at a low acceleration of the vehicle.
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: January 19, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Kohei Itoh, Norikazu Matsuzaki
  • Publication number: 20080211433
    Abstract: To provide a four-wheel driving system capable of obtaining a rotating speed very accurately and improving motor controllability. Solution: In a four-wheel drive vehicle, front wheels 14L and 14R are driven by an engine 1, and rear wheels 15L and 15R are driven by an electric motor 5. A high-power alternator 2 is driven by the engine 1, and electric power generated from the alternator 2 drives the motor 5. In addition to controlling the power generation of the high-power alternator 2 and the driving of the motor 5, a 4WD CU 100 estimates an induced voltage E of the motor 5 from a voltage MHV of the motor and from an output current Ia of the high-power alternator, and estimates a rotating speed Nm of the motor from estimation results on the induced voltage E.
    Type: Application
    Filed: January 24, 2008
    Publication date: September 4, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Norikazu Matsuzaki, Masaru Ito, Shin Fujiwara, Yuuichirou Takamune, Kohei Itoh
  • Publication number: 20080190675
    Abstract: To provide a vehicle driving system capable of engaging a clutch smoothly and early when clutch engaging is requested. A 4WD CU 100 controls a motor 5 and engagement/disengagement of a clutch 4. After the clutch 4 is disengaged, the 4WD CU 100 matches a rotating speed of a section which drives the clutch, and a rotating speed of a section which is driven by the clutch. A speed-synchronizing request detector 140 discriminates whether the driving side requires synchronization in speed. If the speed-synchronizing request detector 140 discriminates that the driving side requires the synchronization in speed, the 4WD CU 100 matches the speed of the driving side with that of the driven side.
    Type: Application
    Filed: January 23, 2008
    Publication date: August 14, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Kohei ITOH, Norikazu MATSUZAKI, Shin FUJIWARA, Yuuichirou TAKAMUNE, Masaru ITO
  • Publication number: 20080056687
    Abstract: In a control apparatus for a vehicle having an electric motor for driving the wheels of the vehicle, an electric power source for energizing the electric motor, a motor torque target value calculation unit for controlling the electric power source, and a field current target value calculation unit, the motor field current is momentarily decreased when the difference between the actual motor armature current and the motor armature current target value exceeds a predetermined value or when the wheels are deemed to slip, and the motor field current is increased as the actual armature current of the motor substantially follows the motor armature current target value.
    Type: Application
    Filed: August 9, 2007
    Publication date: March 6, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Hidekazu Moriki, Shinya Imura, Norikazu Matsuzaki, Kohei Itoh, Masaru Ito
  • Publication number: 20070267572
    Abstract: Provided are a method of evaluating an ion irradiation effect, a process simulator and a device simulator, which allow the influence of ion irradiation on atoms making up a substrate to be evaluated with high accuracy. The method includes irradiating a sample with a beam of ions, and evaluating influence of the ions used for the irradiation on atoms making up the sample, provided that the sample is prepared by alternately and periodically stacking a plurality of thin film layers, and of the plurality of thin film layers, the layer of at least one kind is composed of an isotope layer.
    Type: Application
    Filed: March 19, 2007
    Publication date: November 22, 2007
    Applicant: KEIO UNIVERSITY
    Inventors: Kohei Itoh, Yasuo Shimizu
  • Publication number: 20070227789
    Abstract: In a vehicle control unit provided with a motor applying a power to a rear wheel, in order to obtain sufficient driving force and braking force in a range in which the rear wheel does not slip sideways at a time when a vehicle turns, a motor torque is continuously controlled by calculating a rear wheel braking and driving force in the range in which the rear wheel does not slip sideways on the basis of a vehicle turning amount and a front wheel torque. Specifically, an absolute value of the motor torque is made smaller in accordance with an increase of the vehicle turning amount, and an absolute value of the motor torque is made larger in accordance with an increase of an absolute value of the front wheel torque.
    Type: Application
    Filed: January 25, 2007
    Publication date: October 4, 2007
    Applicant: HITACHI, LTD.
    Inventors: Shinya Imura, Norikazu Matsuzaki, Kohei Itoh, Shin Fujiwara
  • Publication number: 20060219454
    Abstract: A differentiator calculates the acceleration of the rear wheels. An acceleration threshold calculation means enable the skid-detection acceleration threshold to be adjusted corresponding to the conditions of the vehicle. An acceleration skid-detection means make a comparison between the acceleration of the wheels obtained by the differentiator and the skid-detection acceleration threshold adjusted by the acceleration threshold calculation means, and determine whether or not a skid of the wheels has occurred, based upon the comparison result. Such an arrangement provides a vehicle driving force system having a function of detecting a skid even in a case that a skid of the wheels has occurred at a low acceleration of the vehicle.
    Type: Application
    Filed: February 9, 2006
    Publication date: October 5, 2006
    Applicant: Hitachi, Ltd.
    Inventors: Kohei Itoh, Norikazu Matsuzaki
  • Publication number: 20060128520
    Abstract: A vehicle driving force control system capable of reducing a shock caused at the time of clutch release. At the time of a shift from a 4-wheel-drive state to a 2-wheel-drive state, a motor rotation angle control unit brings a clutch into a released state when a clutch angle of an engagement portion of the clutch is within a predetermined range. Also, at the time of a shift from the 4-wheel-drive state to the 2-wheel-drive state, the motor rotation angle control unit controls an output torque of a motor so that the clutch angle of the engagement portion of the clutch takes a predetermined value within the predetermined range.
    Type: Application
    Filed: August 19, 2005
    Publication date: June 15, 2006
    Applicant: Hitachi, Ltd.
    Inventors: Norikazu Matsuzaki, Kohei Itoh