Patents by Inventor Ryohei Nakao

Ryohei Nakao 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).

  • Battery controller
    Patent number: 9952288
    Abstract: Provided is a battery control device which can verify a probability of a state of charge or a state of health of a battery. A battery controller according to the invention calculates a measurement parameter of the battery using the state of charge or the state of health of the battery, and the probability of the state of charge or the state of health is diagnosed by comparing the measurement results (see FIGS. 9(a) and 9(b)).
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: April 24, 2018
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ryohei Nakao, Yohei Kawahara, Akihiko Kudou, Keiichiro Ookawa, Naoyuki Igarashi
  • Battery controlling using charge state calculator and charge state verifier
    Patent number: 9689926
    Abstract: The purpose of the present invention is to provide a battery control device that can appropriately verify the results of the estimation of the state of charge of a battery. This battery control device is provided with a charged state calculation unit that calculates the state of charge of the battery and a charged state verification unit that verifies the results of the calculation. The charged state verification unit calculates the charged state using a calculation procedure that is not being used by the charged state calculation unit.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: June 27, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Keiichiro Ohkawa, Ryohei Nakao, Youhei Kawahara, Naoyuki Igarashi, Yoshinori Aoshima
  • BATTERY CONTROLLER
    Publication number: 20150369873
    Abstract: Provided is a battery control device which can verify a probability of a state of charge or a state of health of a battery. A battery controller according to the invention calculates a measurement parameter of the battery using the state of charge or the state of health of the battery, and the probability of the state of charge or the state of health is diagnosed by comparing the measurement results (see FIGS. 9(a) and 9(b)).
    Type: Application
    Filed: February 5, 2013
    Publication date: December 24, 2015
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Ryohei NAKAO, Yohei KAWAHARA, Akihiko KUDOU, Keiichiro OOKAWA, Naoyuki IGARASHI
  • BATTERY CONTROL DEVICE, BATTERY SYSTEM
    Publication number: 20150301115
    Abstract: The purpose of the present invention is to provide a battery control device that can appropriately verify the results of the estimation of the state of charge of a battery. This battery control device is provided with a charged state calculation unit that calculates the state of charge of the battery and a charged state verification unit that verifies the results of the calculation. The charged state verification unit calculates the charged state using a calculation procedure that is not being used by the charged state calculation unit.
    Type: Application
    Filed: January 25, 2013
    Publication date: October 22, 2015
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Keiichiro OHKAWA, Ryohei NAKAO, Youhei KAWAHARA, Naoyuki IGARASHI, Yoshinori AOSHIMA
  • BATTERY SYSTEM
    Publication number: 20130271146
    Abstract: A battery system includes an assembled battery having a plurality of batteries connected in series, a discharge circuit having a first resistor and a discharge switch connected in series, which is connected in parallel to the respective batteries to discharge the respective batteries, a comparator that compares voltages of the respective batteries with a given voltage through the first resistor, and a diagnostic circuit that conducts a fault diagnosis of the discharge switch on the basis of comparison results of the comparator.
    Type: Application
    Filed: October 21, 2011
    Publication date: October 17, 2013
    Applicant: Hitachi, Ltd.
    Inventors: Kei Sakabe, Motoo Futami, Ryohei Nakao, Takeshi Inoue, Akihiko Kudo