Patents by Inventor Keiji Kaita

Keiji Kaita 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: 20210001855
    Abstract: A vehicle includes a drive device for traveling, and a control device configured to control the drive device so that the vehicle travels with a target driving force based on an accelerator operation amount. The control device is configured to set the target driving force such that a change in the target driving force with respect to a change in the accelerator operation amount is gentler in a case where steady traveling is desired as compared with a case where the steady traveling is not desired. Therefore, in a case where the steady traveling is desired, a variation of a vehicle speed with respect to a slight variation of the accelerator operation amount can be gentle and continuous steady traveling can be facilitated.
    Type: Application
    Filed: April 1, 2020
    Publication date: January 7, 2021
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takahiko HIRASAWA, Keiji KAITA
  • Patent number: 10651446
    Abstract: A battery includes at least an electrode group including a positive electrode, a separator, a negative electrode, and a protection layer. The separator is interposed between the positive electrode and the negative electrode. The positive electrode includes a positive electrode current collector, a positive electrode mixture layer, and a positive electrode tab. The positive electrode mixture layer is disposed on a surface of the positive electrode current collector. The positive electrode tab is electrically connected to the positive electrode current collector. The protection layer covers a surface of the positive electrode tab. A volume resistivity of the protection layer is within a range of one to 100 times a volume resistivity of the positive electrode mixture layer.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: May 12, 2020
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yukinari Tanabe, Keiji Kaita, Nobuyuki Yamazaki, Masaru Takagi, Teruo Ishishita
  • Publication number: 20200119317
    Abstract: An electricity storage device member is provided. The electricity storage device member includes a base material mainly composed of a metal and a resin layer stacked on the base material, in which the resin layer contains a crosslinked fluororesin.
    Type: Application
    Filed: March 20, 2018
    Publication date: April 16, 2020
    Applicants: Sumitomo Electric Fine Polymer, Inc., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Makoto NAKABAYASHI, Hong-Phuc NGUYEN, Keiji KAITA, Motoyoshi OKUMURA, Takuro KIKUCHI
  • Publication number: 20190275900
    Abstract: An electrically driven vehicle includes an electrical storage device that includes a plurality of electrical storage bodies and that charges by a direct current electric power supply, and an electronic control unit that limits charge electric power supplied by the direct current electric power supply as an electrical storage amount of the electrical storage device increases. The plurality of the electrical storage bodies includes a first electrical storage body and a second electrical storage body. The electronic control unit performs adjustment control when charge by the direct current electric power supply is not carried out. The electronic control unit charges the first electrical storage body in priority to the second electrical storage body when charge by the direct current electric power supply is carried out.
    Type: Application
    Filed: February 21, 2019
    Publication date: September 12, 2019
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yoshitaka Niimi, Yoshihiko Hiroe, Keiji Kaita
  • Patent number: 10164442
    Abstract: A battery monitoring device monitoring a battery unit connecting battery blocks, the battery unit being configured by each of the battery blocks connecting battery cells, includes: a voltage detection circuit connected to each of the plurality of battery cells via a voltage detection line; a first equalization circuit as a circuit provided with at least a first switching element, the first equalization circuit being disposed for each of the battery cells and connected to the corresponding battery cell; a resistor element disposed on the voltage detection line; a second equalization circuit as a circuit provided with at least a second switching element, the second equalization circuit being disposed for each of the battery blocks and connected to the corresponding battery block; and a controller configured to control driving of the switching elements. The second equalization circuit is connected further on the battery block side than the resistor element.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: December 25, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji Kaita, Hiromasa Tanaka, Takahiro Okada
  • Patent number: 10158241
    Abstract: An electricity storage system includes an electricity storage block including an electricity storage element for performing charging and discharging; a relay switched between an ON state in which the electric storage block is connected to a load and an OFF state in which a connection between the electricity storage block and the load is cut off; a controller for controlling the ON state and the OFF state of the relay; and a current cutoff circuit so as to cut off energization of the electricity storage block. The current cutoff circuit has an alarm circuit to indicate that the electricity storage block is in an overcharged state by comparing a voltage value of the electricity storage block and a threshold; a latch circuit retains the alarm signal; and a transistor receives an output signal of the latch circuit and switches the relay from the ON state to the OFF state.
    Type: Grant
    Filed: December 3, 2012
    Date of Patent: December 18, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yukinari Tanabe, Yuji Nishi, Hiroyuki Kaiya, Hiromasa Tanaka, Keiji Kaita, Motoi Ito
  • Publication number: 20180337383
    Abstract: A battery includes at least an electrode group including a positive electrode, a separator, a negative electrode and a protection layer. The separator is interposed between the positive electrode and the negative electrode. The positive electrode includes a positive electrode current collector, a positive electrode mixture layer, and a positive electrode tab. The positive electrode mixture layer is disposed on a surface of the positive electrode current collector. The positive electrode tab is electrically connected to the positive electrode current collector. The protection layer covers a surface of the positive electrode tab. A volume resistivity of the protection layer is within a range of one to 100 times a volume resistivity of the positive electrode mixture layer.
    Type: Application
    Filed: May 21, 2018
    Publication date: November 22, 2018
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yukinari Tanabe, Keiji Kaita, Nobuyuki Yamazaki, Masaru Takagi, Teruo Ishishita
  • Patent number: 10096992
    Abstract: An electrical storage system includes an electrical storage device (10); a relay (SMR-B, SMR-G, SMR-P) switching between on/off states; a current interruption circuit (60) interrupting energization of the electrical storage device by causing the relay to switch from the on state to the off state; and a controller (30) executing drive control over the relay. The current interruption circuit includes an alarm circuit (63) outputting an alarm signal indicating overcharging/overdischarging of any one electrical storage block by comparing a voltage value of each electrical storage block with a threshold; a latch circuit (64) retaining the alarm signal; and a transistor (68) causing the relay to switch from the on state to the off state upon reception of an output signal of the latch circuit. The controller determines an energization state of the electrical storage device by executing control for turning on the relay while control for causing the alarm circuit to output the alarm signal is being executed.
    Type: Grant
    Filed: November 29, 2013
    Date of Patent: October 9, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji Kaita, Yuji Nishi, Yukinari Tanabe, Hiromasa Tanaka, Motoi Ito
  • Publication number: 20180241014
    Abstract: A cylindrical battery includes a battery case, a cap, an electric insulating ring, and an outer package label. The battery case houses an electrode body therein, and is connected to negative electrodes. The cap includes a first projecting portion sealing a housing opening of the battery case and serving as a positive electrode projection, and a flat portion connected to the first projecting portion, a peripheral edge portion of the flat portion being located adjacent to the battery case with an electric insulator interposed therebetween. The electric insulating ring covers the flat portion and an adjacent portion between the flat portion and the battery case, and is formed with an exposure hole corresponding to the first projecting portion. A second projecting portion is provided on a surface of the flat portion that faces the electric insulating ring.
    Type: Application
    Filed: February 7, 2018
    Publication date: August 23, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaya MURASE, Yukinari TANABE, Keiji KAITA, Teruo ISHISHITA
  • Patent number: 9941712
    Abstract: An electrical storage system includes a relay switching between an on state where an electrical storage device (10) is connected to a load and an off state where connection of the electrical storage device with the load is interrupted; a controller controlling an on-off state of the relay; and a current interruption circuit (60) interrupting energization of the electrical storage device. The current interruption circuit includes an alarm circuit (63) outputting an alarm signal indicating that any one electrical storage block is in an overcharged state by comparing a voltage value of each electrical storage block with a threshold; a latch circuit (64) retaining the alarm signal; a transistor (66) causing the relay to switch from the on state to the off state upon reception of an output signal of the latch circuit; and a power supply circuit (63d) generating electric power for operating the latch circuit using electric power of the electrical storage device.
    Type: Grant
    Filed: November 28, 2013
    Date of Patent: April 10, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji Kaita, Yuji Nishi, Yukinari Tanabe, Hiromasa Tanaka, Motoi Ito
  • Patent number: 9698615
    Abstract: An electric vehicle includes: a storage device configured to store power used for traveling; an auxiliary battery configured to store power supplied to an auxiliary load; a converter configured to charge the auxiliary battery by using power supplied from the storage device; and a shut-off device configured to switch between a supply condition in which power is supplied to the auxiliary load from the auxiliary battery and a shut-off condition in which power is not supplied to the auxiliary load from the auxiliary battery. During control of the electric vehicle, the converter is controlled such that an output voltage of the converter is higher when the shut-off device is in the shut-off condition than when the shut-off device is in the supply condition.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: July 4, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshinobu Sugiyama, Keiji Kaita, Takahiko Hirasawa, Yasuomi Takeuchi
  • Patent number: 9676384
    Abstract: An ECU determines in an HV mode that a fuel sender gauge is in malfunction when a first condition is met, and determines in an EV mode that the fuel sender gauge is in malfunction when a second condition differing from the first condition is met. The first condition is met when the difference between an estimated value of the fuel consumption amount and an amount of change in the detection value by the fuel sender gauge is greater than a predetermined value Z. The second condition is met when the detection value changes exceeding a predetermined range X.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: June 13, 2017
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Keiji Kaita, Takahiko Hirasawa
  • Publication number: 20170066343
    Abstract: A voltage monitoring system includes a first connection line group connected to input terminals of a first monitoring IC, a first connector configured to connect or disconnect connection lines of the first connection line group to or from connection points each arranged on a side of a positive electrode or negative electrode of any one of battery cells of a first battery group, a second connection line group connected to input terminals of a second monitoring IC, and a second connector configured to connect or disconnect connection lines of the second connection line group to or from connection points arranged on a side of a positive electrode or negative electrode of any one of battery cells of a second battery group. The first monitoring IC is electrically isolated from the second monitoring IC. The first connection line group is electrically isolated from the second connection line group.
    Type: Application
    Filed: September 1, 2016
    Publication date: March 9, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji KAITA, Akinobu MURAKAMI, Hironobu KAWASHIMA
  • Patent number: 9577458
    Abstract: An electrical storage system includes: an electrical storage device (10) including serially connected electrical storage blocks; a relay (SMR-B, SMR-G) switching a connection state between the electrical storage device and a load; a controller (30, 34) controlling the relay; and a current interruption circuit (60) interrupting energization of the electrical storage device. The current interruption circuit (60) includes an alarm circuit (63) outputting an alarm signal indicating that any one electrical storage block is overcharged or overdischarged by comparing a voltage value of each electrical storage block with a threshold; a latch circuit (64) retaining the alarm signal; and a transistor (68) causing the relay to switch from an on state to an off state upon reception of a latch circuit output signal. The controller determines an energization state of the electrical storage device after executing control for causing the alarm circuit to output the alarm signal by changing the voltage value or the threshold.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: February 21, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji Kaita, Yuji Nishi, Yukinari Tanabe, Hiromasa Tanaka, Motoi Ito
  • Patent number: 9555705
    Abstract: An ECU includes a collision determination unit, a condition determination unit, and an output suppression unit. The collision determination unit monitors an acceleration detected by a collision sensor, and determines that a vehicle collision has occurred when the acceleration is greater than a predetermined value. The condition determination unit determines whether or not a vehicular speed absolute value is smaller than a threshold vehicular speed in a determination period lasting from the determination of collision for a predetermined time. The output suppression unit suppresses an output of a vehicle driving force when the vehicular speed absolute value is smaller than the threshold vehicular speed in the determination period.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: January 31, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji Kaita, Takeshi Hoshiba, Takahiko Hirasawa
  • Publication number: 20160197499
    Abstract: A battery monitoring device monitoring a battery unit connecting battery blocks, the battery unit being configured by each of the battery blocks connecting battery cells, includes: a voltage detection circuit connected to each of the plurality of battery cells via a voltage detection line; a first equalization circuit as a circuit provided with at least a first switching element, the first equalization circuit being disposed for each of the battery cells and connected to the corresponding battery cell; a resistor element disposed on the voltage detection line; a second equalization circuit as a circuit provided with at least a second switching element, the second equalization circuit being disposed for each of the battery blocks and connected to the corresponding battery block; and a controller configured to control driving of the switching elements. The second equalization circuit is connected further on the battery block side than the resistor element.
    Type: Application
    Filed: December 31, 2015
    Publication date: July 7, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji KAITA, Hiromasa TANAKA, Takahiro OKADA
  • Publication number: 20160152230
    Abstract: An ECU determines in an HV mode that a fuel sender gauge is in malfunction when a first condition is met, and determines in an EV mode that the fuel sender gauge is in malfunction when a second condition differing from the first condition is met. The first condition is met when the difference between an estimated value of the fuel consumption amount and an amount of change in the detection value by the fuel sender gauge is greater than a predetermined value Z. The second condition is met when the detection value changes exceeding a predetermined range X.
    Type: Application
    Filed: May 20, 2014
    Publication date: June 2, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji Kaita, Takahiko Hirasawa
  • Patent number: 9242644
    Abstract: A hybrid vehicle illustrated as a representative example of an electrically-powered vehicle includes a chargeable/dischargeable power storage device, a motor configured to generate a vehicle drive force by receiving supply of power from the power storage device, an internal combustion engine as a drive force source, and a generator configured to generate charging power for the power storage device by power generation using an output of the internal combustion engine. If the generator cannot be operated normally, the control unit causes the electrically-powered vehicle to perform limp-home mode traveling by traveling using only the motor. During the limp-home mode traveling, the control device calculates a remaining travelable distance in the limp-home mode traveling, based on at least a remaining capacity of the power storage device and a vehicle speed.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: January 26, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takahiko Hirasawa, Keiji Kaita
  • Publication number: 20150357856
    Abstract: [Problem] To provide a configuration for cutting off energization of an electricity storage block without interposing a controller. [Solution] The electricity storage system has: an electricity storage block including an electricity storage element (11) for performing charging and discharging; a relay (SMR-B, SMR-G) switched between an ON state in which the electric storage block is connected to a load (22, 23) and an OFF state in which a connection between the electricity storage block and the load is cut off; a controller (34) for controlling the ON state and the OFF state of the relay; and a current cutoff circuit (60) for switching the relay from the ON state to the OFF state, so as to cut off energization of the electricity storage block.
    Type: Application
    Filed: December 3, 2012
    Publication date: December 10, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yukinari TANABE, Yuji NISHI, Hiroyuki KAIYA, Hiromasa TANAKA, Keiji KAITA, Motoi ITO
  • Patent number: 9166515
    Abstract: A converter is disposed between a first battery and a power line for transmitting power inputted to and outputted from a motor for traveling. A second battery, on the other hand, is connected to the power line with a relay being interposed therebetween. A control unit controls the relay to be turned on or off in accordance with an operating state of the motor.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: October 20, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiji Kaita, Teruo Ishishita, Yuji Nishi, Masaru Takagi, Masaki Okamura