Patents by Inventor Toshikatsu Saito

Toshikatsu Saito 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: 10451024
    Abstract: Knocking and pre-ignition are identified, without contributing to pre-ignition, even when vibration magnitudes and timings of occurrence of the knocking and pre-ignition are the same. When detecting an abnormal combustion that cannot be identified as a knocking or pre-ignition, ignition timing is advanced, at which time knocking is identified when an abnormal combustion intensity increases, and pre-ignition is identified when a difference between ignition timing and abnormal combustion occurrence timing increases.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: October 22, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Junichi Inoue, Yuhei Matsushima, Toshikatsu Saito
  • Publication number: 20180298871
    Abstract: Knocking and pre-ignition are identified, without contributing to pre-ignition, even when vibration magnitudes and timings of occurrence of the knocking and pre-ignition are the same. When detecting an abnormal combustion that cannot be identified as a knocking or pre-ignition, ignition timing is advanced, at which time knocking is identified when an abnormal combustion intensity increases, and pre-ignition is identified when a difference between ignition timing and abnormal combustion occurrence timing increases.
    Type: Application
    Filed: July 18, 2017
    Publication date: October 18, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Junichi INOUE, Yuhei MATSUSHIMA, Toshikatsu SAITO
  • Patent number: 9957904
    Abstract: When the starting timing of a negative valve overlapping (NVO) period exists at the delayed-angle side of the starting timing of a first NVO period, fuel injection into a cylinder is not started; when the starting timing of an NVO period exists between the starting timing of the first NVO period and the starting timing of the second NVO period, fuel injection into the cylinder is started at a given timing that includes the exhaust top dead center; when the starting timing of an NVO period exists between the starting timing of the second NVO period and the starting timing of the third NVO period, fuel injection into the cylinder is started at a given timing that does not include the exhaust top dead center, and that exists at both the advanced-angle and delayed-angle sides of the exhaust top dead center.
    Type: Grant
    Filed: April 2, 2014
    Date of Patent: May 1, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshikatsu Saito, Yuhei Matsushima
  • Patent number: 9541012
    Abstract: In a turbocharged internal combustion engine, an amount of cylinder suction air is calculated with sufficiently high accuracy to suitably control the internal combustion engine in consideration of influences of an exhaust pressure on a volumetric efficiency equivalent value without requiring a huge memory capacity, in fewer adaptive man hours, and under a low operation load. A correction calculation parameter is calculated using an exhaust pressure, an exhaust pressure for pre-correction volumetric efficiency equivalent value, and an intake manifold pressure, and a post-corrected volumetric efficiency equivalent value is calculated by correcting a pre-correction volumetric efficiency equivalent value using the correction calculation parameter. An amount of air entering a cylinder from an intake manifold is calculated on the basis of the post-correction volumetric efficiency equivalent value.
    Type: Grant
    Filed: June 3, 2013
    Date of Patent: January 10, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshikatsu Saito, Michihisa Yokono, Tomokazu Makino
  • Patent number: 9394836
    Abstract: An internal combustion engine control apparatus includes a pseudo knock determination unit that determines whether or not a pseudo knock has been produced in a knock detection window, based on at least one of the frequency, a status amount indicating a rotation speed of the internal combustion engine, a status amount indicating a load of the internal combustion engine, and a status amount indicating an air-fuel ratio of the internal combustion engine; and a moving-average processing unit that sets a second period to a period that is approximately the same as a first period, in the case where it has been determined that the pseudo knock was not produced, and that does not implement moving-averaging or sets the second period to a period that is narrower than the first period, in the case where it has been determined that a pseudo knock was produced.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: July 19, 2016
    Assignees: Mitsubishi Electric Corporation, Mazda Motor Corporation
    Inventors: Toshikatsu Saito, Takahiko Ono, Keitaro Ezumi, Tomokuni Kusunoki, Atsushi Inoue, Hiroki Morimoto
  • Publication number: 20150114340
    Abstract: When the starting timing of an NVO period exists at the delayed-angle side of the starting timing of a first NVO period, fuel injection into a cylinder is not started; when the starting timing of an NVO period exists between the starting timing of the first NVO period and the starting timing of the second NVO period, fuel injection into the cylinder is started at a given timing that includes the exhaust top death center; when the starting timing of an NVO period exists between the starting timing of the second NVO period and the starting timing of the third NVO period, fuel injection into the cylinder is started at a given timing that does not include the exhaust top death center, and that exists at both the advanced-angle and delayed-angle sides of the exhaust top death center.
    Type: Application
    Filed: April 2, 2014
    Publication date: April 30, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshikatsu SAITO, Yuhei MATSUSHIMA
  • Patent number: 8949006
    Abstract: A knock control apparatus for internal combustion engine includes: a knock signal normalization unit that normalizes a knock signal extracted from an output signal of a knock sensor; a knock determination threshold setting unit that sets a knock determination threshold on the basis of the normalized knock signal; a knock intensity computation unit that calculates knock intensity on the basis of the normalized knock signal and the set knock determination threshold; a knock determination unit that determines a presence or absence of a knock on the basis of the calculated knock intensity; and a knock correction amount computation unit that calculates a knock correction amount to correct the calculated knock intensity in a case where an occurrence of a knock is determined. The knock signal normalization unit normalizes a standard deviation of the knock signal by dividing the knock signal by an average value of the knock signal.
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: February 3, 2015
    Assignees: Mitsubishi Electric Corporation, Mazda Motor Corporation
    Inventors: Yuhei Matsushima, Hideki Hagari, Toshikatsu Saito, Keitaro Ezumi, Tomokuni Kusunoki
  • Publication number: 20140200791
    Abstract: In a turbocharged internal combustion engine, an amount of cylinder suction air is calculated with sufficiently high accuracy to suitably control the internal combustion engine in consideration of influences of an exhaust pressure on a volumetric efficiency equivalent value without requiring a huge memory capacity, in fewer adaptive man hours, and under a low operation load. A correction calculation parameter is calculated using an exhaust pressure, an exhaust pressure for pre-correction volumetric efficiency equivalent value, and an intake manifold pressure, and a post-corrected volumetric efficiency equivalent value is calculated by correcting a pre-correction volumetric efficiency equivalent value using the correction calculation parameter. An amount of air entering a cylinder from an intake manifold is calculated on the basis of the post-correction volumetric efficiency equivalent value.
    Type: Application
    Filed: June 3, 2013
    Publication date: July 17, 2014
    Inventors: Toshikatsu SAITO, Michihisa YOKONO, Tomokazu MAKINO
  • Publication number: 20130151127
    Abstract: An internal combustion engine control apparatus includes a pseudo knock determination unit that determines whether or not a pseudo knock has been produced in a knock detection window, based on at least one of the frequency, a status amount indicating a rotation speed of the internal combustion engine, a status amount indicating a load of the internal combustion engine, and a status amount indicating an air-fuel ratio of the internal combustion engine; and a moving-average processing unit that sets a second period to a period that is approximately the same as a first period, in the case where it has been determined that the pseudo knock was not produced, and that does not implement moving-averaging or sets the second period to a period that is narrower than the first period, in the case where it has been determined that a pseudo knock was produced.
    Type: Application
    Filed: September 12, 2012
    Publication date: June 13, 2013
    Applicants: MAZDA MOTOR CORPORATION, MITSUBISHI ELECTRIC CORPORATION
    Inventors: Toshikatsu SAITO, Takahiko ONO, Keitaro EZUMI, Tomokuni KUSUNOKI, Atsushi INOUE, Hiroki MORIMOTO
  • Publication number: 20120080008
    Abstract: A knock control apparatus for internal combustion engine includes: a knock signal normalization unit that normalizes a knock signal extracted from an output signal of a knock sensor; a knock determination threshold setting unit that sets a knock determination threshold on the basis of the normalized knock signal; a knock intensity computation unit that calculates knock intensity on the basis of the normalized knock signal and the set knock determination threshold; a knock determination unit that determines a presence or absence of a knock on the basis of the calculated knock intensity; and a knock correction amount computation unit that calculates a knock correction amount to correct the calculated knock intensity in a case where an occurrence of a knock is determined. The knock signal normalization unit normalizes a standard deviation of the knock signal by dividing the knock signal by an average value of the knock signal.
    Type: Application
    Filed: October 3, 2011
    Publication date: April 5, 2012
    Applicants: MAZDA MOTOR CORPORATION, MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuhei MATSUSHIMA, Hideki HAGARI, Toshikatsu SAITO, Keitaro EZUMI, Tomokuni KUSUNOKI
  • Patent number: 8103432
    Abstract: Knocking control is performed using a data group of serial segments each including a predetermined number of values obtained by A/D-converting a signal that appears within a knocking detection window and a data group consisting of serial segments each including the predetermined number of values. The starting timing is shifted and a time-frequency analysis is applied to the data groups in a plurality of frequency bandwidths. Peak values and integration values of spectrums, within the knocking detection window, outputted after the time-frequency analysis in each of the frequency bandwidths are calculated. A P/H method is performed based on the peak value in each of the frequency bandwidths and an integration method is performed based on the integration value in each of the frequency bandwidths for a knocking determination. If knocking is detected through at least one of the methods, the ignition timing is delayed in order to avoid the knocking.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: January 24, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventor: Toshikatsu Saito
  • Publication number: 20090287398
    Abstract: Provision is made for an internal-combustion-engine control apparatus whose knocking detectability is high regardless of the type of an engine.
    Type: Application
    Filed: October 2, 2008
    Publication date: November 19, 2009
    Applicant: Mitsubishi Electric Corporation
    Inventor: Toshikatsu SAITO