Patents by Inventor Takahiko Inada

Takahiko Inada 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: 11105311
    Abstract: An ignition device for an internal combustion engine includes an ignition coil, a first switch, a secondary current adjuster, and controller The ignition coil includes a primary coil, a core, and a secondary coil. The first switch switches an energized state of the primary coil between an ON state and an OFF state. The secondary current adjuster adjusts a current value of a secondary current flowing through the secondary coil. The controller controls the secondary current adjuster so that a current value of the secondary current in at least a part of a charging period of the ignition plug, which is a period from when the energized state of the primary coil is switched from the ON state to the OFF state by the first switch to when dielectric breakdown occurs in the ignition plug, becomes smaller than a peak value of the secondary current after the dielectric breakdown occurs.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: August 31, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshifumi Nakamura, Takahiko Inada
  • Publication number: 20210227168
    Abstract: An image sensor includes a pixel array; a logic circuit configured to convert an image signal generated from the pixel array during a first period into image data; and a memory. The image data may be written in the memory during a second period, of which at least a portion overlaps the first period. The logic circuit may write dummy data in the memory during a third period overlapping the first period and not overlapping the second period.
    Type: Application
    Filed: July 29, 2020
    Publication date: July 22, 2021
    Inventor: Takahiko INADA
  • Publication number: 20210222665
    Abstract: An ignition device for an internal combustion engine includes an ignition coil, a first switch, a secondary current adjuster, and controller. The ignition coil includes a primary coil, a core, and a secondary coil. The first switch switches an energized state of the primary coil between an ON state and an OFF state. The secondary current adjuster adjusts a current value of a secondary current flowing through the secondary coil. The controller controls the secondary current adjuster so that a current value of the secondary current in at least a part of a charging period of the ignition plug, which is a period from when the energized state of the primary coil is switched from the ON state to the OFF state by the first switch to when dielectric breakdown occurs in the ignition plug, becomes smaller than a peak value of the secondary current after the dielectric breakdown occurs.
    Type: Application
    Filed: September 29, 2020
    Publication date: July 22, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshifumi NAKAMURA, Takahiko INADA
  • Patent number: 10934991
    Abstract: The invention provides an internal combustion engine combustion state detecting device such that ascertaining a combustion state using ionic current detection is carried out accurately over a wide operating range of an internal combustion engine. The internal combustion engine combustion state detecting device includes a spark plug that has a central electrode and a grounding electrode opposing across a gap, and a discharge stopping-induced current detecting device that estimates an induced current caused by a stopping of a spark discharge generated in the gap between the central electrode and the grounding electrode, wherein an ionic current detection threshold is set to a threshold value that is not affected by the induced current using the induced current estimated by the discharge stopping-induced current detecting device.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: March 2, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshifumi Nakamura, Takahiko Inada
  • Patent number: 10808673
    Abstract: To provide a control device, of an internal combustion engine, that accurately identifies the combustion state through ion current detection in a wide operation range of the internal combustion engine, without impairing the reliability and the durability of the control device of the internal combustion engine. This internal combustion engine control device includes: an ignition plug having a center electrode and a ground electrode opposed to each other with a gap therebetween; a circulation device for short-circuiting a primary winding to cause a circulation route to enter a conduction state, thereby stopping spark discharge; and an ion-current-detection bias voltage control device for controlling bias voltage for ion current detection. The potential of the center electrode in an ion current detection period is controlled by adjusting the value of the bias voltage and the changing speed of the bias voltage.
    Type: Grant
    Filed: January 2, 2019
    Date of Patent: October 20, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshifumi Nakamura, Takahiko Inada
  • Patent number: 10626807
    Abstract: To provide a controller and a control method for an internal combustion engine capable of suppressing causing erroneous determination of combustion state even if noise component is superimposed on the ion current. In combustion state determination processing which determines combustion state of each combustion based on ion current, a controller for an internal combustion engine calculates a minimum value of ion current during a processing period, and prohibits determination of combustion state at a time point when the minimum value of ion current is below a preliminarily set determination prohibition threshold value.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: April 21, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuhei Matsushima, Takahiko Inada
  • Publication number: 20190331083
    Abstract: To provide a control device, of an internal combustion engine, that accurately identifies the combustion state through ion current detection in a wide operation range of the internal combustion engine, without impairing the reliability and the durability of the control device of the internal combustion engine. This internal combustion engine control device includes: an ignition plug having a center electrode and a ground electrode opposed to each other with a gap therebetween; a circulation device for short-circuiting a primary winding to cause a circulation route to enter a conduction state, thereby stopping spark discharge; and an ion-current-detection bias voltage control device for controlling bias voltage for ion current detection. The potential of the center electrode in an ion current detection period is controlled by adjusting the value of the bias voltage and the changing speed of the bias voltage.
    Type: Application
    Filed: January 2, 2019
    Publication date: October 31, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshifumi NAKAMURA, Takahiko INADA
  • Patent number: 10280848
    Abstract: There is provided an internal combustion engine control apparatus that is capable of determining accurately from an ignition discharging time period whether the intake valve and the exhaust valve are in the operative condition or in the inoperative condition. A cylinder deactivation controller causes a first ignition controller to perform a first ignition control on the basis of the ignition timing when issuing no cylinder deactivation request, and causes a second ignition controller to perform a second ignition control on the basis of an energizing time period when issuing the cylinder deactivation controller. The discharging time period is calculated by a discharging time period calculation section on the basis of an ion current signal output from the ignition coil.
    Type: Grant
    Filed: March 6, 2015
    Date of Patent: May 7, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuhei Matsushima, Takahiko Inada
  • Publication number: 20190113017
    Abstract: The invention provides an internal combustion engine combustion state detecting device such that ascertaining a combustion state using ionic current detection is carried out accurately over a wide operating range of an internal combustion engine. The internal combustion engine combustion state detecting device includes a spark plug that has a central electrode and a grounding electrode opposing across a gap, and a discharge stopping-induced current detecting device that estimates an induced current caused by a stopping of a spark discharge generated in the gap between the central electrode and the grounding electrode, wherein an ionic current detection threshold is set to a threshold value that is not affected by the induced current using the induced current estimated by the discharge stopping-induced current detecting device.
    Type: Application
    Filed: January 25, 2018
    Publication date: April 18, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshifumi NAKAMURA, Takahiko INADA
  • Patent number: 10167839
    Abstract: The ignition control device includes a spark plug that includes a first electrode and a second electrode disposed so as to oppose each other, an ignition coil that includes a plurality of sets of a primary coil and a secondary coil, generates a high voltage in the secondary coil by energizing or interrupting a primary current supplied to the primary coil, and applies the generated high voltage to the first electrode, and a control unit that, in a case where a plurality of the primary coils are driven during a single ignition process, temporarily stops energization of a primary current supplied to a second primary coil when a primary current supplied to a first primary coil is interrupted, and re-energizes the primary current supplied to the second primary coil following the elapse of an energization stoppage period.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: January 1, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiko Inada, Takahiro Enomoto
  • Patent number: 10167841
    Abstract: An internal-combustion-engine combustion state detecting apparatus is configured in such a way as to include a circulation unit that short-circuits a primary winding so as to form a circulation path including the primary winding, while a spark discharge is produced in an ignition plug, and a circulation current control unit that controls a circulation current flowing in the circulation path and in such a way that based on an ion current detected by an ion current detection apparatus, the combustion state of an inflammable fuel-air mixture is detected.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: January 1, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshifumi Nakamura, Takahiko Inada
  • Publication number: 20180306129
    Abstract: To provide a controller and a control method for an internal combustion engine capable of suppressing causing erroneous determination of combustion state even if noise component is superimposed on the ion current. In combustion state determination processing which determines combustion state of each combustion based on ion current, a controller for an internal combustion engine calculates a minimum value of ion current during a processing period, and prohibits determination of combustion state at a time point when the minimum value of ion current is below a preliminarily set determination prohibition threshold value.
    Type: Application
    Filed: September 12, 2017
    Publication date: October 25, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuhei MATSUSHIMA, Takahiko INADA
  • Publication number: 20180230960
    Abstract: An internal-combustion-engine combustion state detecting apparatus is configured in such a way as to include a circulation unit that short-circuits a primary winding so as to form a circulation path including the primary winding, while a spark discharge is produced in an ignition plug, and a circulation current control unit that controls a circulation current flowing in the circulation path and in such a way that based on an ion current detected by an ion current detection apparatus, the combustion state of an inflammable fuel-air mixture is detected.
    Type: Application
    Filed: May 9, 2017
    Publication date: August 16, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshifumi NAKAMURA, Takahiko INADA
  • Publication number: 20170292492
    Abstract: The ignition control device includes a spark plug that includes a first electrode and a second electrode disposed so as to oppose each other, an ignition coil that includes a plurality of sets of a primary coil and a secondary coil, generates a high voltage in the secondary coil by energizing or interrupting a primary current supplied to the primary coil, and applies the generated high voltage to the first electrode, and a control unit that, in a case where a plurality of the primary coils are driven during a single ignition process, temporarily stops energization of a primary current supplied to a second primary coil when a primary current supplied to a first primary coil is interrupted, and re-energizes the primary current supplied to the second primary coil following the elapse of an energization stoppage period.
    Type: Application
    Filed: October 12, 2016
    Publication date: October 12, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahiko INADA, Takahiro ENOMOTO
  • Patent number: 9605643
    Abstract: There is provided a leakage detection apparatus that can accurately detect a leakage condition in an internal combustion engine having a cylinder resting function. An ignition plug provided in the combustion chamber of a cylinder is made to generate an ignition signal at least once when based on an instruction from a cylinder resting control unit, a fuel injection valve and a valve driving mechanism are stopping the operation thereof; the leakage condition of the ignition plug is detected based on an output signal generated by an ion current detection circuit at a timing other than the timing when ignition discharge is caused.
    Type: Grant
    Filed: April 6, 2015
    Date of Patent: March 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiko Inada, Takahiro Enomoto, Yuhei Matsushima, Takeshi Koda
  • Publication number: 20160201636
    Abstract: There is provided a leakage detection apparatus that can accurately detect a leakage condition in an internal combustion engine having a cylinder resting function. An ignition plug provided in the combustion chamber of a cylinder is made to generate an ignition signal at least once when based on an instruction from a cylinder resting control unit, a fuel injection valve and a valve driving mechanism are stopping the operation thereof; the leakage condition of the ignition plug is detected based on an output signal generated by an ion current detection circuit at a timing other than the timing when ignition discharge is caused.
    Type: Application
    Filed: April 6, 2015
    Publication date: July 14, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahiko INADA, Takahiro ENOMOTO, Yuhei MATSUSHIMA, Takeshi KODA
  • Patent number: 9382852
    Abstract: Provided is a control device for an internal combustion engine having a cylinder resting mechanism, capable of accurately detecting an intake/exhaust valve state and therefore serving to solve problems of fuel depletion and environmental conservation. The control device includes: ignition means 2 including high voltage means 202 for causing ignition discharge on an ignition plug based on an ignition signal, and an ignition discharge parameter detection circuit 203 for detecting a parameter indicating a state of the ignition discharge; and valve state determination means 206 for determining a valve operation state of an intake/exhaust valve based on at least one of an ignition discharge duration, ignition insulation breakdown voltage, and ignition discharge maintaining voltage detected based on an output signal from the ignition discharge parameter detection circuit 203. Operation of cylinder resting control means 207 is controlled based on a determination result by the valve state determination means 206.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: July 5, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiko Inada, Takahiro Enomoto, Yuhei Matsushima
  • Publication number: 20160108824
    Abstract: There is provided an internal combustion engine control apparatus that is capable of determining accurately from an ignition discharging time period whether the intake valve and the exhaust valve are in the operative condition or in the inoperative condition. A cylinder deactivation controller causes a first ignition controller to perform a first ignition control on the basis of the ignition timing when issuing no cylinder deactivation request, and causes a second ignition controller to perform a second ignition control on the basis of an energizing time period when issuing the cylinder deactivation controller. The discharging time period is calculated by a discharging time period calculation section on the basis of an ion current signal output from the ignition coil.
    Type: Application
    Filed: March 6, 2015
    Publication date: April 21, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuhei MATSUSHIMA, Takahiko INADA
  • Publication number: 20150300271
    Abstract: Provided is a control device for an internal combustion engine having a cylinder resting mechanism, capable of accurately detecting an intake/exhaust valve state and therefore serving to solve problems of fuel depletion and environmental conservation. The control device includes: ignition means 2 including high voltage means 202 for causing ignition discharge on an ignition plug based on an ignition signal, and an ignition discharge parameter detection circuit 203 for detecting a parameter indicating a state of the ignition discharge; and valve state determination means 206 for determining a valve operation state of an intake/exhaust valve based on at least one of an ignition discharge duration, ignition insulation breakdown voltage, and ignition discharge maintaining voltage detected based on an output signal from the ignition discharge parameter detection circuit 203. Operation of cylinder resting control means 207 is controlled based on a determination result by the valve state determination means 206.
    Type: Application
    Filed: July 17, 2014
    Publication date: October 22, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takahiko INADA, Takahiro ENOMOTO, Yuhei MATSUSHIMA
  • Patent number: 8701629
    Abstract: There is provided a combustion state detecting apparatus capable of detecting combustion-state abnormality in an internal combustion engine. A comparison timing is set to be advanced in terms of the rotation angle of the crankshaft of an internal combustion engine with respect to the ending timing of an electric quantity based on an ion that occurs when ignition is performed normally through a predetermined ignition signal among the plurality of ignition signals; in the case where, as a result of the comparison between the detected ending timing of an electric quantity based on an ion and the comparison timing, the ending timing is advanced in terms of the rotation angle of the crankshaft with respect to the comparison timing, it is determined that the combustion based on ignition through the predetermined ignition signal is abnormal.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: April 22, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kimihiko Tanaya, Takahiko Inada, Yumi Takaoka, Takeshi Koda