Patents by Inventor Hiroshi Iwasawa

Hiroshi Iwasawa 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: 10014699
    Abstract: Even with a large ripple voltage superposed on a voltage of a battery cell, the voltage of the battery cell can be measured accurately. In a battery monitoring device, a supply circuit, based on a reference voltage inputted from an assembled battery, generates a driving voltage for driving each of switching elements, of a selection circuit and supplies the driving voltage to the selection circuit. The reference voltage is inputted from the assembled battery to the supply circuit via a detecting filter circuit. As a result, a time constant of a route through which the reference voltage is inputted from the assembled battery to the supply circuit is approximately equal to time constants of detecting filter circuits.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: July 3, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Hiroshi Iwasawa, Akihiko Kudo, Mitsuo Noda, Mutsumi Kikuchi, Tomonori Kanai
  • Patent number: 9800137
    Abstract: A power supply startup system activates a power supply of a device provided with a battery or the like at high speed by a wireless signal while suppressing current consumption on standby. The power supply startup system includes a battery, a device supplied with a power from the battery, and a controller which performs wireless communication with the device. The device includes a power supply section which generates a power supply from the battery, a startup section which receives a wireless startup signal transmitted by the controller and outputs a startup signal to the power supply section, a control section which controls the power supply section and the startup section, and a wireless communication section which performs wireless communication with the controller. The wireless startup signal includes at least two signal regions of a first stage and a second stage.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: October 24, 2017
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Takahide Terada, Mutsumi Kikuchi, Akihiko Kudo, Takanori Yamazoe, Hiroshi Iwasawa
  • Publication number: 20170222432
    Abstract: The purpose of the present invention is to provide an electronic control device including an integratable protection circuit that is capable of protecting an internal circuit, a sensor, etc., against both of surge voltage application and battery connection abnormality. The electronic control device includes an input terminal connectable to an external sensor and switch, and a power supply wiring and a GND wiring that are utilized to supply power to the internal circuit, wherein protection elements each including a PN junction are connected between the input terminal and the power supply wiring or the GND wiring, and protection resistor are further connected in series between the protection elements and the power supply wiring or the GND wiring.
    Type: Application
    Filed: August 7, 2015
    Publication date: August 3, 2017
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Hiroshi IWASAWA, Teppei HIROTSU, Ryosuke ISHIDA
  • Publication number: 20170082984
    Abstract: The objective of the present invention is to increase reliability in an electronic control device when speculative execution is performed, by reducing the risk of erroneous control by the electronic control device, said erroneous control being due to speculative execution failures (such as failures to predict a future state or failure to complete a control calculation due to the execution of an advanced control calculation) which are generated when speculative execution is performed using limited hardware resources in an electronic control device having a control period restriction. Therefore, this electronic control device, which performs a calculation in accordance with one or more external inputs, and outputs a calculation result by a prescribed time, has one or more first calculation units that perform a calculation using a current input, and one or more second calculation units that perform a calculation using a prior input that been input at a point in time prior to the current input.
    Type: Application
    Filed: May 7, 2015
    Publication date: March 23, 2017
    Applicant: Hitachi Ltd.
    Inventors: Tatsuya HORIGUCHI, Teppei HIROTSU, Hiroshi IWASAWA
  • Patent number: 9506997
    Abstract: In a magnetic-field angle detection device and a rotation angle detection device in which the accuracy of the measured angle is not degraded even if the MR ratio of the tunneling magnetoresistance element is increased. In a magnetic-field-angle measurement apparatus including a magnetic-field-angle detection circuit and a magnetic sensor having a tunneling magnetoresistance element with a pinned magnetic layer, the magnetic-field-angle detection circuit has a power-supply unit that outputs a constant voltage as a bias voltage to the tunneling magnetoresistance element of the magnetic sensor and a current-detection unit that detects an output current of the tunneling magnetoresistance element.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: November 29, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Mutsumi Suzuki, Hiroshi Iwasawa, Masahiro Iwamura
  • Publication number: 20160301112
    Abstract: Communication distance can be extended in a battery system that transmits states of the battery cells by wireless communication. Each of cell controllers wirelessly transmits measurement result of states of battery cells in cell groups to a battery controller, by using an electric power supplied from the battery cells in the cell groups. The battery controller continuously transmits unmodulated carrier wave to each of the cell controllers. Each of the cell controllers changes an impedance for the unmodulated carrier wave transmitted from the battery controller at a predetermined timing in dependence on the measurement result of the states of the battery cells in the cell groups. Due to this, the measurement result of the states of the battery cells in the cell groups is wirelessly transmitted to the battery controller.
    Type: Application
    Filed: January 27, 2014
    Publication date: October 13, 2016
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Takanori YAMAZOE, Hiroshi IWASAWA, Takahide TERADA, Takashi TAKEUCHI, Mutsumi KIKUCHI, Akihiko KUDO, Tomonori KANAI
  • Publication number: 20160274610
    Abstract: An electronic control device having an input processing circuit capable of arbitrarily connecting one or both of a pull-up resistor and a pull-down resistor to an input signal from outside and capable of arbitrarily setting a resistance value of the pull-up resistor and/or the pull-down resistor connected, to diagnose whether the resistance value of the pull-up/pull-down resistor is a designed value. The input processing circuit has a unit that diagnoses whether the resistance value of the pull-up resistor and/or the pull-down resistor is within an expected range. The pull-down resistor is connected to the pull-up resistor when the resistance value of the pull-up resistor is to be diagnosed, the pull-up resistor is connected to the pull-down resistor when the resistance value of the pull-down resistor is to be diagnosed, and the resistance value is diagnosed based on the voltage divided by both the pull-up resistor and the pull-down resistor.
    Type: Application
    Filed: October 6, 2014
    Publication date: September 22, 2016
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: HIROSHI IWASAWA, Teppei HIROTSU, Chihiro SATO
  • Publication number: 20160226276
    Abstract: Even with a large ripple voltage superposed on a voltage of a battery cell, the voltage of the battery cell can be measured accurately. In a battery monitoring device, a supply circuit, based on a reference voltage inputted from an assembled battery, generates a driving voltage for driving each of switching elements, of a selection circuit and supplies the driving voltage to the selection circuit. The reference voltage is inputted from the assembled battery to the supply circuit via a detecting filter circuit. As a result, a time constant of a route through which the reference voltage is inputted from the assembled battery to the supply circuit is approximately equal to time constants of detecting filter circuits.
    Type: Application
    Filed: August 6, 2014
    Publication date: August 4, 2016
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Hiroshi IWASAWA, Akihiko KUDO, Mitsuo NODA, Mutsumi KIKUCHI, Tomonori KANAI
  • Patent number: 9246337
    Abstract: A battery pack includes a plurality of battery units mutually connected in parallel, each including a cell group in which one or two or more secondary cells are connected in series, and a first current control element that is connected in series with this cell group, a first control means that controls the charging/discharging current for each battery unit by controlling the operation of the first current control element included in each of the battery unit; a voltage measurement means that measures the voltage of the cell group or cells included in each of the battery unit, and a diagnosis means that diagnoses a deterioration level or a fault of each battery unit on the basis of the voltage of the cell group or cells measured by the voltage measurement means.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: January 26, 2016
    Assignee: HITACHI, LTD.
    Inventors: Hiroshi Iwasawa, Akihiko Emori, Yutaka Kobayashi, Ko Takahashi, Akihiko Kanouda
  • Publication number: 20160006343
    Abstract: A power supply startup system activates a power supply of a device provided with a battery or the like at high speed by a wireless signal while suppressing current consumption on standby. The power supply startup system includes a battery, a device supplied with a power from the battery, and a controller which performs wireless communication with the device. The device includes a power supply section which generates a power supply from the battery, a startup section which receives a wireless startup signal transmitted by the controller and outputs a startup signal to the power supply section, a control section which controls the power supply section and the startup section, and a wireless communication section which performs wireless communication with the controller. The wireless startup signal includes at least two signal regions of a first stage and a second stage.
    Type: Application
    Filed: February 27, 2013
    Publication date: January 7, 2016
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Takahide TERADA, Mutsumi KIKUCHI, Akihiko KUDO, Takanori YAMAZOE, Hiroshi IWASAWA
  • Publication number: 20150357685
    Abstract: A battery system that is capable of transmitting the voltage value of each cell by means of wireless communication while suppressing costs and suppressing the number of components includes: a plurality of cells, each having a positive electrode terminal and a negative electrode terminal; voltage detection circuits that detect the voltages of the plurality cells; voltage detection lines that connect each of the positive electrode and negative electrode terminals of the cells to each voltage detection circuit; and an upper controller that performs wireless communication with the voltage detection circuits so as to receive, from each of the voltage detection circuits, the corresponding voltage of each cells. The voltage detection lines function as an antenna used to provide wireless communication between the voltage detection circuit and the upper controller.
    Type: Application
    Filed: January 27, 2014
    Publication date: December 10, 2015
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Hiroshi IWASAWA, Takahide TERADA, Mutsumi KIKUCHI, Takanori YAMAZOE, Tomonori KANAI, Akihiko KUDO, Takashi TAKEUCHI
  • Patent number: 8836348
    Abstract: The present invention provides a high-accuracy electrostatic capacitance type physical quantity sensor and angular velocity sensor configured so as to be capable of suppressing noise derived from internal noise while maintaining resistance to externally-incoming noise. A detection element 10 has a movable mass 18 supported displaceably by a physical quantity given from the outside, and a detection electrode Ef. A shield wire 16 is disposed around wirings connected to the input of a capacitance detection circuit 30 and is connected to a dc potential of low impedance. A value Cin of an input capacitance relative to a fixed potential of low impedance at a portion at which the detection element 10 is connected with the capacitance detection circuit 30 is set to fall within a range of 1.5 pF<Cin<20 pF.
    Type: Grant
    Filed: July 15, 2010
    Date of Patent: September 16, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Hiroshi Iwasawa, Masahiro Matsumoto, Toshiaki Nakamura
  • Patent number: 8828584
    Abstract: A lithium-ion rechargeable battery module having a plurality of lithium-ion battery cells, arranged that battery cells located at an high temperature portion of the module are electrically connected in parallel with battery cells located at a low temperature portion of the module. The battery cells at the high temperature portion have a higher electric resistance at 20° C. and a better high-temperature storage characteristic at 50° C. than those of the battery cells located at the low temperature portion.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: September 9, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Akira Gunji, Shin Takahashi, Hiroshi Iwasawa, Shin Yamauchi, Takefumi Okumura
  • Publication number: 20140130596
    Abstract: The purpose of the present invention is to achieve accurate angular velocity detection even when an angular velocity detection sensor is set in an environment in which oscillation and electromagnetic noise have significant influence. Provided is an angular velocity detection device which has an oscillating body displaceable in first and second directions that are perpendicular to each other, and which detects, as an angular velocity, a displacement of the oscillating body in the second direction while the oscillating body is being oscillated in the first direction, wherein in accordance with a frequency change in a drive signal for oscillating the oscillating body in the first direction, the frequency of a servo signal for detecting the angular velocity from the quantity of displacement in the second direction is changed (see FIG. 1).
    Type: Application
    Filed: June 20, 2012
    Publication date: May 15, 2014
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Toshiaki Nakamura, Masahiro Matsumoto, Hiroshi Iwasawa, Satoshi Asano, Masahide Hayashi
  • Patent number: 8456179
    Abstract: The present invention aims to provide an angular velocity detection device which is capable of reducing the effect of coupling between a drive electrode and a first displacement detection electrode by a floating capacity, and is low in cost. In the angular velocity detection device, an oscillating body 21 is displaceable in a first direction and a second direction which orthogonally intersect each other. The oscillating body 21 is oscillated in the first direction by an electrostatic force corresponding to a drive signal generated by a non-interference signal generator 1. A carrier signal generated by the non-interference signal generator 1 is applied to the oscillating body 21. A first displacement detection circuit 3 and a second displacement detection circuit 4 each detect a displacement of the oscillating body 21 as a displacement modulation signal indicative of a change in electrostatic capacity synchronized with the carrier signal to thereby detect an angular velocity.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: June 4, 2013
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Hiroshi Iwasawa, Toshiaki Nakamura, Masahiro Matsumoto
  • Publication number: 20130088201
    Abstract: A battery pack includes a plurality of battery units mutually connected in parallel, each including a cell group in which one or two or more secondary cells are connected in series, and a first current control element that is connected in series with this cell group, a first control means that controls the charging/discharging current for each battery unit by controlling the operation of the first current control element included in each of the battery unit; a voltage measurement means that measures the voltage of the cell group or cells included in each of the battery unit, and a diagnosis means that diagnoses a deterioration level or a fault of each battery unit on the basis of the voltage of the cell group or cells measured by the voltage measurement means.
    Type: Application
    Filed: April 23, 2010
    Publication date: April 11, 2013
    Applicant: HITACHI, LTD.
    Inventors: Hiroshi Iwasawa, Akihiko Emori, Yutaka Kobayashi, Ko Takahashi, Akihiko Kanouda
  • Publication number: 20130063135
    Abstract: In a magnetic-field angle detection device and a rotation angle detection device in which the accuracy of the measured angle is not degraded even if the MR ratio of the tunneling magnetoresistance element is increased. In a magnetic-field-angle measurement apparatus including a magnetic-field-angle detection circuit and a magnetic sensor having a tunneling magnetoresistance element with a pinned magnetic layer, the magnetic-field-angle detection circuit has a power-supply unit that outputs a constant voltage as a bias voltage to the tunneling magnetoresistance element of the magnetic sensor and a current-detection unit that detects an output current of the tunneling magnetoresistance element.
    Type: Application
    Filed: May 14, 2010
    Publication date: March 14, 2013
    Inventors: Mutsumi Suzuki, Hiroshi Iwasawa, Masahiro Iwamura
  • Publication number: 20130020997
    Abstract: A battery system having a battery string configured by connecting in series a plurality of battery units includes: an SOC detection unit for individually detecting states of charge of the plurality of battery units; and a charge-and-discharge control unit for individually charging and discharging the battery units, based on a full charge capacity of each battery unit and each state of charge of the battery units individually detected by the detection unit, upon the battery system being in no load state, the control unit individually charges and discharges the battery units so that the states of charge of the battery units are approximately equal with each other when the battery units are in a discharge end state and so that a difference between the states of charge of the battery units is relatively large when the battery units are approximately in a full charge state.
    Type: Application
    Filed: March 8, 2012
    Publication date: January 24, 2013
    Applicant: Hitachi, Ltd.
    Inventors: Hiroshi IWASAWA, Mitsutoshi Honda
  • Publication number: 20120315512
    Abstract: A positive-electrode material for a lithium ion battery includes two or more types of positive-electrode active materials which are expressed by a chemical formula LiMPO4 (where M includes one or more types of metal elements selected from the group consisting of Mn, Fe, Co, and Ni) and which have an olivine structure. The M in at least one of the positive-electrode active materials includes two or more types of metal elements. An open circuit voltage curve in charging includes an initial rising region, one or more flat regions, one or more detectable voltage varying regions, and a terminal rising region in a state-of-charge region of 0% to 100%.
    Type: Application
    Filed: June 8, 2012
    Publication date: December 13, 2012
    Applicant: HITACHI, LTD.
    Inventors: Kan KITAGAWA, Hiroshi IWASAWA, Shin YAMAUCHI, Shin TAKAHASHI
  • Publication number: 20120263999
    Abstract: A lithium-ion rechargeable battery module having a plurality of lithium-ion battery cells, arranged that battery cells located at an high temperature portion of the module are electrically connected in parallel with battery cells located at a low temperature portion of the module. The battery cells at the high temperature portion have a higher electric resistance at 20° C. and a better high-temperature storage characteristic at 50° C. than those of the battery cells located at the low temperature portion.
    Type: Application
    Filed: April 10, 2012
    Publication date: October 18, 2012
    Inventors: Akira GUNJI, Shin TAKAHASHI, Hiroshi IWASAWA, Shin YAMAUCHI, Takefumi OKUMURA