Patents by Inventor Tomohiro Ohisa

Tomohiro Ohisa 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).

  • Control device for internal combustion engine
    Patent number: 8447498
    Abstract: Even when an engine is started in various combustion states, an excessive increase in engine speed at the start of the engine is suppressed without an influence of the combustion states and with an excellent responsiveness. Ignition timing (or a combustion injection amount) at the start of an internal combustion engine is corrected in accordance with a crank angle cycle ratio which is a ratio of a combustion period crank angle cycle and a reference crank angle cycle.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: May 21, 2013
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Masahiro Toyohara, Minoru Okubo, Takao Miyake, Tomohiro Ohisa
  • Control apparatus for internal combustion engine
    Patent number: 8280613
    Abstract: A fuel injection control apparatus for an internal combustion engine which can inject a fuel injection quantity to a fuel injector with accuracy even when the fuel injection quantity is reduced than before is provided.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: October 2, 2012
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Masahiro Toyohara, Takashi Okamoto, Tomohiro Ohisa, Yoshikazu Ishii
  • Control apparatus for internal combustion engine
    Patent number: 8240290
    Abstract: In a control apparatus for an internal combustion engine, when a fuel pressure detected by the fuel pressure detecting unit is not smaller than a threshold P_a, the value opening time duration of a injector is increased to a value larger than its normal value, such control as to stop fuel injection from the injector is inhibited, the low pressure fuel pump is stopped, thus quickly lowering the fuel pressure. After the fuel pressure is lowered, the valve opening time duration of the injector is returned to the normal value, and a discharge quantity of the low pressure fuel pump is changed on the basis of a difference between the fuel pressure detected by the fuel pressure detecting unit and a target fuel pressure.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: August 14, 2012
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takao Miyake, Masahiro Toyohara, Tomohiro Ohisa, Yoshikazu Ishii
  • Control Device for Internal Combustion Engine
    Publication number: 20110301827
    Abstract: Even when an engine is started in various combustion states, an excessive increase in engine speed at the start of the engine is suppressed without an influence of the combustion states and with an excellent responsiveness. Ignition timing (or a combustion injection amount) at the start of an internal combustion engine is corrected in accordance with a crank angle cycle ratio which is a ratio of a combustion period crank angle cycle and a reference crank angle cycle.
    Type: Application
    Filed: January 25, 2010
    Publication date: December 8, 2011
    Inventors: Masahiro Toyohara, Minoru Okubo, Takao Miyake, Tomohiro Ohisa
  • Control Apparatus for Internal Combustion Engine
    Publication number: 20110100333
    Abstract: A fuel injection control apparatus for an internal combustion engine which can inject a fuel injection quantity to a fuel injector with accuracy even when the fuel injection quantity is reduced than before is provided.
    Type: Application
    Filed: August 13, 2010
    Publication date: May 5, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Masahiro TOYOHARA, Takashi Okamoto, Tomohiro Ohisa, Yoshikazu Ishii
  • Control Apparatus for Internal Combustion Engine
    Publication number: 20100122690
    Abstract: In a control apparatus for an internal combustion engine, when a fuel pressure detected by the fuel pressure detecting unit is not smaller than a threshold P_a, the value opening time duration of a injector is increased to a value larger than its normal value, such control as to stop fuel injection from the injector is inhibited, the low pressure fuel pump is stopped, thus quickly lowering the fuel pressure. After the fuel pressure is lowered, the valve opening time duration of the injector is returned to the normal value, and a discharge quantity of the low pressure fuel pump is changed on the basis of a difference between the fuel pressure detected by the fuel pressure detecting unit and a target fuel pressure.
    Type: Application
    Filed: November 12, 2009
    Publication date: May 20, 2010
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Takao MIYAKE, Masahiro Toyohara, Tomohiro Ohisa, Yoshikazu Ishii