Patents by Inventor Yuji Katsumata

Yuji Katsumata 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: 20150365032
    Abstract: A motor control device includes a current command value calculating device calculating a basic current command value, a first compensation device compensating for a delay in the rotor magnetic flux response of the motor by amplifying the basic current command value, a first current command value limiting device for restricting a post-compensation current command value by a first current limiting value, a second compensation device calculating a compensation value for the amplified current command value, an adding device calculating the post-compensation current command value by adding the amplified current command value and the compensation value, and motor control device controlling the motor, the second compensation device calculating, as the compensation value, a command value corresponding to a portion limited by the first current limiting value of the amplified current amplification command value.
    Type: Application
    Filed: February 6, 2014
    Publication date: December 17, 2015
    Inventor: Yuji KATSUMATA
  • Patent number: 9174524
    Abstract: A vehicle comprises a drive motor (15) that generates a drive torque to be transmitted to drive wheels (18), a power supply source (12, 17) that includes, at least, a generator (12), and supplies power to the drive motor (15), and a programmable controller (20).
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: November 3, 2015
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Yuji Katsumata, Kengo Fujiwara
  • Publication number: 20150303858
    Abstract: A motor control device of a vehicle includes a motor and a lock mechanism for locking the rotation of vehicle wheels. The motor control device includes a detection device for detecting release of the lock mechanism, a damping control device for suppressing torsional vibration of a drive shaft, and a current control device for controlling current flowing to the motor on the basis of a motor torque command value set by the damping control device. The current control device channels an excitation current for generating a magnetic flux in the motor on the basis of the detection result of the detection device.
    Type: Application
    Filed: November 28, 2013
    Publication date: October 22, 2015
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Yuji KATSUMATA, Ken ITO, Takashi NAKAJIMA, Akira SAWADA, Shou OONO, Hiroyuki KOMATSU
  • Patent number: 9020718
    Abstract: A torque converter (1) connecting an engine (14) and a transmission (15) of a vehicle is provided with a lockup clutch (2), and a controller (5) is programmed to increase an engagement force of a lockup clutch (2) under open loop control before shifting to feedback control of the engaging force using a target slip rotation speed. When an engine output torque rapidly decreases during open loop control (S59, S60), the controller (5) decreases the engaging force according to a variation amount of the engine output torque (S61, S65), thereby preventing an unintentional sudden engagement of the lockup clutch (2) due to decrease in the engine output torque.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: April 28, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yuji Katsumata, Satoshi Segawa
  • Patent number: 8996220
    Abstract: A torque control device for use in a hybrid vehicle equipped with a generator driven by an internal combustion engine has a command value calculator that calculates an engine torque command value and a rotation speed command value of the generator based on a target generation power of the generator set in accordance with a running state of the hybrid vehicle, a generator torque command value calculator that calculates a generator torque command value to cause a rotation speed calculation value to match the rotation speed command value, a generator controller that controls the generator based on the generator torque command value, a rotation speed detector that detects a rotation speed detection value of the generator, and a pulsation removal filter.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: March 31, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Sho Ohno, Yuji Katsumata
  • Publication number: 20140188319
    Abstract: A torque control device for use in a hybrid vehicle equipped with a generator driven by an internal combustion engine has a command value calculator that calculates an engine torque command value and a rotation speed command value of the generator based on a target generation power of the generator set in accordance with a running state of the hybrid vehicle, a generator torque command value calculator that calculates a generator torque command value to cause a rotation speed calculation value to match the rotation speed command value, a generator controller that controls the generator based on the generator torque command value, a rotation speed detector that detects a rotation speed detection value of the generator, and a pulsation removal filter.
    Type: Application
    Filed: June 20, 2012
    Publication date: July 3, 2014
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Sho Ohno, Yuji Katsumata
  • Publication number: 20120016549
    Abstract: A vehicle comprises a drive motor (15) that generates a drive torque to be transmitted to drive wheels (18), a power supply source (12, 17) that includes, at least, a generator (12), and supplies power to the drive motor (15), and a programmable controller (20).
    Type: Application
    Filed: April 9, 2010
    Publication date: January 19, 2012
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Yuji Katsumata, Kengo Fujiwara
  • Publication number: 20070005211
    Abstract: A torque converter (1) connecting an engine (14) and a transmission (15) of a vehicle is provided with a lockup clutch (2), and a controller (5) is programmed to increase an engagement force of a lockup clutch (2) under open loop control before shifting to feedback control of the engaging force using a target slip rotation speed. When an engine output torque rapidly decreases during open loop control (S59, S60), the controller (5) decreases the engaging force according to a variation amount of the engine output torque (S61, S65), thereby preventing an unintentional sudden engagement of the lockup clutch (2) due to decrease in the engine output torque.
    Type: Application
    Filed: June 28, 2006
    Publication date: January 4, 2007
    Inventors: Yuji Katsumata, Satoshi Segawa