Patents by Inventor Takayuki Kifuku

Takayuki Kifuku 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: 11047679
    Abstract: An angle detecting apparatus is obtained. The angle detecting apparatus is capable of correcting an electrical angle frequency component of an angle signal contained angle signal. An angle detecting apparatus computes an angle signal of a rotary machine from a sine signal and a cosine signal obtained from the angle signal. Offset correction values for the sine signal and the cosine signal are computed from the angle signal. The computed offset correction value for the sine signal is added to the sine signal to correct the sine signal, and the computed offset correction value for the cosine signal is added to the cosine signal to correct the cosine signal.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: June 29, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Tetsuya Kojima, Yoshihiko Kinpara, Takayuki Kifuku
  • Publication number: 20210114652
    Abstract: To provide a motor control device capable of reducing noise without requiring preparation of a plurality of PWM carrier waves, an offset voltage is added equally to each phase of three-phase voltage command values from an inverter to output modified three-phase voltage command values, which are compared to a PWM carrier wave to output three-phase terminal voltages to a motor, and an offset voltage is switched among n offset candidate voltages (n is a natural number of three or more) having different values at set time intervals for output to vary timings to turn on and timings to turn off the three-phase terminal voltages equally for all phases.
    Type: Application
    Filed: January 11, 2017
    Publication date: April 22, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya MORI, Takayuki KIFUKU, Akira FURUKAWA
  • Patent number: 9981684
    Abstract: A vehicle steering control apparatus includes a power-supply supply portion 101 supplying a power supply to a micro-controller 102, an inverter 104 supplying power to drive a motor 5, a gate driver 103 controlling the inverter 104, a motor relay 105 opening and closing a current-passing path between the inverter 104 and the motor 5, a motor relay driver 106 controlling the motor relay 105, and a monitoring control portion A 108a and a monitoring control portion B 108b monitoring a power-supply voltage of the power-supply supply portion 101. Because multiple monitoring control portions are included, even in the event of an inconvenience in either one of the monitoring control portions A 108a and B 108b, the motor 5 can be stopped quickly in a reliable manner when the power-supply voltage goes out of a normal operation range.
    Type: Grant
    Filed: December 5, 2011
    Date of Patent: May 29, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaki Matsushita, Takayuki Kifuku, Hiroyuki Kozuki, Masatoshi Saito, Yu Kawano
  • Patent number: 9254862
    Abstract: Provided is a control device for an electric power steering device, the control device configured to control an output torque of a motor that provides an assist torque to a steering torque, the output being controlled based on a steering-torque signal from a torque sensor that detects a steering torque, the control device controls the output torque using a correction signal to damp a vibration at a natural frequency determined in accordance with a transfer characteristic from the steering-torque signal to the output torque.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: February 9, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Isao Kezobo, Yoshihiko Kimpara, Takayuki Kifuku, Tatsuya Mori, Takashi Iwasaki, Masashi Iwane, Yuji Takatsuka
  • Patent number: 9242670
    Abstract: In a steering control device, a road surface reaction force torque calculation module (52) uses a vehicle speed, steering angle, and vehicle model to calculate a caster-trail-caused torque, a self-aligning torque, and a road surface reaction force torque. A reaction force command current calculation module (53) uses the road surface reaction force torque and the vehicle speed to calculate a reaction force command current.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: January 26, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaya Endo, Masahiko Kurishige, Takayuki Kifuku, Masaki Matsushita, Hideki Doi
  • Patent number: 9061700
    Abstract: Provided is an electric power steering control apparatus for an electric power steering system equipped with a torque sensor for detecting a steering torque of the steering system and a motor for generating a torque for assisting the steering torque, including a motor target torque calculation unit for calculating a torque of the motor in response to a steering torque signal from the torque sensor and a motor-applied voltage calculation unit for calculating a voltage applied to the motor in response to a motor target torque signal from the motor target torque calculation unit, in which the motor target torque calculation unit generates the motor target torque signal indicating a motor target torque whose ratio to a steering torque indicated by the steering torque signal is set such that an influence of a torque fluctuation of the motor on a driver becomes equal to or smaller than a predetermined value.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: June 23, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventor: Takayuki Kifuku
  • Patent number: 9043090
    Abstract: An automatic steering apparatus that can suppress steering wheel vibration and that can also smooth angular control. In the automatic steering apparatus, a motor that steers steered wheels is controlled by a control unit. Information from an angle sensor that generates a signal that corresponds to a steering angle of the steered wheels is sent to the control unit. The control unit corrects a target steering angle of the steered wheels such that angular acceleration of the target steering angle is less than or equal to a limiting value. The control unit controls the motor such that the steering angle of the steered wheels tracks the corrected target steering angle based on the information from the angle sensor.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: May 26, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masaya Endo, Masahiko Kurishige, Kenji Ogawa, Takayuki Kifuku, Hiroyuki Kozuki
  • Patent number: 9016123
    Abstract: In an angle detection method with a resolver, the method being for detecting a rotational angle of a rotator by synchronously detecting a first signal and a second signal that are two phase sine wave modulation signals obtained from a one phase excitation/two phase output resolver, the method includes: a first signal detection process which detects a signal in the order of the first signal and the second signal; and a second signal detection process which detects a signal in the order of the second signal and the first signal.
    Type: Grant
    Filed: February 13, 2012
    Date of Patent: April 28, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiko Kimpara, Yasuaki Hori, Tatsuya Mori, Takayuki Kifuku, Takahiro Okanoue
  • Patent number: 8983727
    Abstract: A steering control apparatus is obtained which can achieve a sophisticated control function and redundancy of a motor output torque control unit with a simple construction. The apparatus includes a motor 3 that provides assist torque to a steering system, and a processing unit 2 that has an input processing section 21 for taking in detection signals of various kinds of sensors, and an inverter 25a for driving the motor 3, wherein a command is given to the inverter 25a based on the detection signals. The processing unit 2 has a motor target output torque calculation section 221a, a motor output torque control unit 222, a plurality of main-calculation sections, and a plurality of sub-calculation sections corresponding to the main-calculation sections, and determines abnormality of the motor output torque control unit 222 based on individual calculation results of the main-calculation sections and the sub-calculation sections.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: March 17, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takayuki Kifuku, Hiroyuki Kozuki, Masaki Matsushita
  • Patent number: 8977436
    Abstract: An electric power steering system includes steering a torque detector that detects steering torque, and a motor that provides assist torque based on the detected steering torque, wherein for the purpose of estimating, without detecting motor rotation angular information and rotation angular velocity information, the road reaction torque in which the influence of the motor inertia torque is eliminated, a value corresponding to rotation velocity of a steering shaft is calculated based on the steering torque and the assist torque, to calculate road reaction torque based on the value corresponding to the rotation velocity of the steering shaft.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: March 10, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaya Endo, Takashi Iwasaki, Masahiko Kurishige, Takayuki Kifuku, Yoshihiko Kinpara
  • Patent number: 8917050
    Abstract: A power inverter is provided that can apply to an AC rotary machine three-phase voltages of high amplitudes and low distortion while suppressing ohmic loss attributed to current detection resisters. The power inverter includes a superimposed voltage command computing device which is configured to compute and output a superimposed voltage command depending on the difference between a maximum value and a minimum value of three-phase voltage commands; a voltage command modification device which is configured to add the superimposed voltage command to each of the three-phase voltage commands and outputting modified three-phase voltage commands; and a power output device which is configure to output the three-phase voltages based on the modified three-phase voltage commands.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: December 23, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiko Kimpara, Takayuki Kifuku, Tatsuya Mori
  • Publication number: 20140350791
    Abstract: A vehicle steering control apparatus includes a power-supply supply portion 101 supplying a power supply to a micro-controller 102, an inverter 104 supplying power to drive a motor 5, a gate driver 103 controlling the inverter 104, a motor relay 105 opening and closing a current-passing path between the inverter 104 and the motor 5, a motor relay driver 106 controlling the motor relay 105, and a monitoring control portion A 108a and a monitoring control portion B 108b monitoring a power-supply voltage of the power-supply supply portion 101. Because multiple monitoring control portions are included, even in the event of an inconvenience in either one of the monitoring control portions A 108a and B 108b, the motor 5 can be stopped quickly in a reliable manner when the power-supply voltage goes out of a normal operation range.
    Type: Application
    Filed: December 5, 2011
    Publication date: November 27, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masaki Matsushita, Takayuki Kifuku, Hiroyuki Kozuki, Masatoshi Saito, Yu Kawano
  • Publication number: 20140316733
    Abstract: An angle detecting apparatus is obtained. The angle detecting apparatus is capable of correcting an electrical angle frequency component of an angle signal contained angle signal. An angle detecting apparatus computes an angle signal of a rotary machine from a sine signal and a cosine signal obtained from the angle signal. Offset correction values for the sine signal and the cosine signal are computed from the angle signal. The computed offset correction value for the sine signal is added to the sine signal to correct the sine signal, and the computed offset correction value for the cosine signal is added to the cosine signal to correct the cosine signal.
    Type: Application
    Filed: December 12, 2012
    Publication date: October 23, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tatsuya Mori, Tetsuya Kojima, Yoshihiko Kinpara, Takayuki Kifuku
  • Patent number: 8842455
    Abstract: There is provided an electric-power conversion apparatus including a chopper circuit; a current sense resistor that detects the output current of the chopper circuit; a differential detection circuit that outputs, as a differential detection signal (vo), the electric potential difference across the current sense resistor; and a calculation means that corrects the differential detection signal (vo) from the differential detection circuit by use of a control signal (D1) for the chopper circuit so as to calculate the output current (i0) of the chopper circuit.
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: September 23, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiko Kimpara, Takayuki Kifuku, Tetsuya Kojima, Tatsuya Mori
  • Patent number: 8810175
    Abstract: Provided is a motor control device including a main calculation unit (101), which takes a first operation state for controlling a brushless motor (5), and a second operation state for stopping the motor control, and a sub calculation unit (102) for monitoring the main calculation unit (101) by means of a first monitoring unit (106) in the first state, for calculating a motor rotation angle in the second state, thereby enabling continuous calculation of the motor rotation angle even when the motor control is stopped, for carrying out monitoring the sub calculation unit (102) by means of second monitoring unit (201), thereby securing reliability, and for calculating the motor rotation angle in a second calculation cycle in the second operation state, the second calculation cycle being longer than a first calculation cycle in the first operation state, thereby reducing a current consumption.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: August 19, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yu Kawano, Masatoshi Saito, Takayuki Kifuku
  • Patent number: 8670902
    Abstract: An electric power steering apparatus includes an rotating AC machine which generates an auxiliary torque for assisting a steering torque of a steering system; and a controller which performs control so that the allowed electric current amplitude of the rotating AC machine becomes large if a rotational speed of the rotating AC machine is increased. Accordingly, it is possible to release or lessen the limit on the number of repetitions or continuous time of the “stationary steering” or the “end contact”.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: March 11, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiko Kimpara, Takayuki Kifuku, Masatsugu Nakano
  • Publication number: 20140058630
    Abstract: Provided is a control device for an electric power steering device, for controlling an output torque of a motor for outputting an assist torque based on a steering-torque signal from a torque sensor for detecting a steering torque, the control device for negatively feeding back a correction signal based on a motor-speed signal from motor-speed detection means for detecting a rotation speed of a rotary shaft of the motor to damp a vibration at a natural frequency determined in accordance with a transfer characteristic from the steering-torque signal to the output torque.
    Type: Application
    Filed: February 29, 2012
    Publication date: February 27, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Isao Kezobo, Yoshihiko Kimpara, Takayuki Kifuku, Tatsuya Mori, Takashi Iwasaki, Masashi Iwane, Yuji Takatsuka
  • Patent number: 8648560
    Abstract: In an electric motor control apparatus, an electric motor driving unit includes: a current detection unit configured to detect a current flowing through a current detection place in the electric motor driving unit. A control unit includes a current calculation unit configured to calculate a current value of a current flowing through an electric motor from an offset correction value obtained based on a first detection value detected at a time when a current flows through the current detection place and a second detection value detected at a time when a current does not flow through the current detection place. The offset correction value includes: a first offset correction value stored in nonvolatile memory of the control unit at a time of assembling the electric motor control apparatus; and a second offset correction value computed by the control unit while the electric motor is driven.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: February 11, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaki Matsushita, Takayuki Kifuku, Yasuaki Hori
  • Patent number: 8626394
    Abstract: An electric power steering control device includes: a vibration extracting filter for performing filter processing on a rotation speed of a motor to reduce a gain on a low frequency side so as to output a vibration-component signal; a current variable gain map for detecting a current flowing through the motor as a first state quantity so as to calculate a current variable gain based on the current; a rotation-speed variable gain map for detecting the rotation speed of the motor as a second state quantity so as to calculate a rotation-speed variable gain based on the rotation speed; a correction mechanism calculating a vibration suppression current; and current controller calculating a target current so as to control the current flowing through the motor.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: January 7, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Isao Kezobo, Masahiko Kurishige, Masaya Endo, Takayuki Kifuku
  • Patent number: 8604734
    Abstract: In an electric motor control apparatus, an electric motor driving unit includes: a current detection unit configured to detect a current flowing through a current detection place in the electric motor driving unit. A control unit includes a current calculation unit configured to calculate a current value of a current flowing through an electric motor from an offset correction value obtained based on a first detection value detected at a time when a current flows through the current detection place and a second detection value detected at a time when a current does not flow through the current detection place. The offset correction value includes: a first offset correction value stored in nonvolatile memory of the control unit at a time of assembling the electric motor control apparatus; and a second offset correction value computed by the control unit while the electric motor is driven.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: December 10, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaki Matsushita, Takayuki Kifuku, Yasuaki Hori