Patents by Inventor Harufumi Muto

Harufumi Muto 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: 6856890
    Abstract: In an internal combustion engine wherein a valve timing can be changed in at least two stages and wherein an exhaust gas recirculation passage provided with a control valve is connected to an intake pipe downstream of a throttle valve, there is provided an intake air amount estimation apparatus that estimates, on the basis of an intake pipe pressure, an amount of intake air drawn via the throttle valve. An amount of recirculated exhaust gas flowing past the control valve having a specific opening degree based on an intake pipe pressure in the case of the first valve timing is calculated as an intake exhaust gas amount. On the assumption that this intake exhaust gas amount remains unchanged irrespective of a valve timing, an intake air amount in the case of the second valve timing is calculated.
    Type: Grant
    Filed: December 8, 2003
    Date of Patent: February 15, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Daisuke Kobayashi
  • Publication number: 20040230364
    Abstract: An electronic control unit corrects ignition timing according to changes in an internal EGR amount accompanying actuation of a variable valve actuation mechanism used in an internal combustion engine. The electronic control unit computes a base correction amount AVVTb based on an engine speed NE and an engine load ratio KL. The control unit multiplies the base correction amount AVVTb by the ratio of a square number of an actual valve overlap amount realOL to a square number of a target valve overlap amount tOL, thereby computing a VVT correction amount AVVT of ignition timing. As result, the engine is easily and properly controlled based on the relationship between the state of the variable valve actuation mechanism and changes in the internal EGR amount.
    Type: Application
    Filed: February 17, 2004
    Publication date: November 18, 2004
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takefumi Uchida, Harufumi Muto
  • Publication number: 20040220718
    Abstract: An electronic control unit of an internal combustion engine computes a remaining combusted gas amount Megr1, which exists in a cylinder immediately before an intake valve is opened, based on an intake pipe pressure Pm, an engine speed NE, and an intake valve opening timing Topen. At the same time, the control unit computes a backflow combusted gas amount Megr2, which is the amount of combusted gas that flows back into the cylinder from an exhaust pipe after the intake valve is opened, based on the intake pipe pressure Pm, the engine speed NE and a valve overlap amount OL. The control unit computes the sum of the remaining combusted gas amount Megr1 and the backflow combusted gas amount Megr2, and sets the sum as an estimated internal EGR amount MegrALL. As a result, the internal EGR amount is readily and accurately estimated.
    Type: Application
    Filed: February 17, 2004
    Publication date: November 4, 2004
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takefumi Uchida, Harufumi Muto
  • Publication number: 20040122584
    Abstract: In an internal combustion engine, at least one of the pressure and temperature in an intake passage downstream of a throttle valve is calculated using an expression of a relationship established based on the law of conservation of mass among an amount of air passing the throttle valve and flowing into the intake passage, an amount of exhaust gas passing an exhaust gas flow control valve and flowing into the intake passage, and an amount of gas flowing from the intake passage into a cylinder of the engine, and an expression of a relationship established based on the law of conservation of energy among an amount of energy of the air passing the throttle valve and flowing into the intake passage, an amount of energy of the exhaust gas passing the exhaust gas flow control valve and flowing into the intake passage, and an amount of energy of the gas flowing from the intake passage into the cylinder of the engine.
    Type: Application
    Filed: December 11, 2003
    Publication date: June 24, 2004
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Harufumi Muto, Daisuke Kobayashi, Satoshi Furukawa
  • Publication number: 20040117104
    Abstract: In an internal combustion engine wherein a valve timing can be changed in at least two stages and wherein an exhaust gas recirculation passage provided with a control valve is connected to an intake pipe downstream of a throttle valve, there is provided an intake air amount estimation apparatus that estimates, on the basis of an intake pipe pressure, an amount of intake air drawn via the throttle valve. An amount of recirculated exhaust gas flowing past the control valve having a specific opening degree based on an intake pipe pressure in the case of the first valve timing is calculated as an intake exhaust gas amount. On the assumption that this intake exhaust gas amount remains unchanged irrespective of a valve timing, an intake air amount in the case of the second valve timing is calculated.
    Type: Application
    Filed: December 8, 2003
    Publication date: June 17, 2004
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Harufumi Muto, Daisuke Kobayashi
  • Publication number: 20040088101
    Abstract: A device for estimating the amount of intake air of an internal combustion engine comprising intake pipe pressure calculation means for calculating an intake pipe pressure, at this time, downstream of the throttle valve, and intake air amount calculation means for calculating the amount of intake air, at this time, based on the intake pipe pressure at this time calculated by said intake pipe pressure calculation means, is provided. The intake pipe pressure calculation means calculates the intake pipe pressure at this time by using the intake pipe pressure calculated at the last time and the amount of air passing through the throttle valve at the last time calculated by means for calculating the amount of air passing through the throttle valve.
    Type: Application
    Filed: October 22, 2003
    Publication date: May 6, 2004
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Harufumi Muto
  • Patent number: 6711490
    Abstract: An intake pressure computing apparatus and a method for the same compute an intake pipe pressure P0 based on a sum of a throttle passing air amount QA0 calculated based on at least a throttle opening and a flow of purge air that flows into an intake pipe through a purge passage, or a purge flow rate QP, and compute an intake pipe pressure P3 using an intake air amount QA based on an output from an air flow meter. An intake air amount computing apparatus and a method for the same compute an amount of air drawn into an engine, or an intake air amount, based on the intake pipe pressure P0 and the intake pipe pressure P3.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: March 23, 2004
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Daisuke Kobayashi, Harufumi Muto
  • Publication number: 20030230277
    Abstract: In order to provide an intake flow rate detecting apparatus of an internal combustion engine which accurately compensates for an air flow meter detection error due to intake pulsation so as to make it possible to detect an intake flow rate more accurately, regardless of the of type of flow rate control mechanism, an intake flow rate detecting apparatus according to one embodiment of the invention includes a throttle valve which is provided in an intake passage and which adjusts a rate of the air that is taken into a combustion chamber of an internal combustion engine, at least one flow rate control mechanisms which are provided between the throttle valve and the combustion chamber and which control an air flow rate between the throttle valve and the combustion chamber, and a flow rate sensor which is provided upstream of the throttle valve in the intake passage and which detects a flow rate of air flowing through the intake passage.
    Type: Application
    Filed: June 2, 2003
    Publication date: December 18, 2003
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Harufumi Muto
  • Patent number: 6644104
    Abstract: An intake air-flow rate detecting apparatus of an internal combustion engine according to the present invention has a thermal air-flow sensor for detecting an intake air-flow rate of the internal combustion engine, and a response lag compensator for compensating for a response lag of the air-flow sensor, using a first-order lag element concerning a heat release amount in the air-flow sensor. Since the response lag process is carried out on the dimension of the heat release amount, the response lag of the air-flow sensor can be compensated for with accuracy and the response lag of the thermal air-flow sensor can be compensated for with high accuracy.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: November 11, 2003
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Harufumi Muto, Daisuke Kobayashi, Satoshi Furukawa
  • Patent number: 6571767
    Abstract: Flow amount calculation controller controls a certain subject based on a flow amount of fluid, passing through a variable throttle portion provided in an air passage, calculated from an upstream pressure Pu, an upstream density &rgr;u, a downstream pressure Pd, an opening area Ad and a specific heat ratio k by the following formula.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: June 3, 2003
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Daisuke Kobayashi, Akira Ohata, Harufumi Muto, Hisayo Dohta
  • Publication number: 20020055814
    Abstract: An intake pressure computing apparatus and a method for the same compute an intake pipe pressure P0 based on a sum of a throttle passing air amount QA0 calculated based on at least a throttle opening and a flow of purge air that flows into an intake pipe through a purge passage, or a purge flow rate QP, and compute an intake pipe pressure P3 using an intake air amount QA based on an output from an air flow meter. An intake air amount computing apparatus and a method for the same compute an amount of air drawn into an engine, or an intake air amount, based on the intake pipe pressure P0 and the intake pipe pressure P3.
    Type: Application
    Filed: October 25, 2001
    Publication date: May 9, 2002
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Kobayashi, Harufumi Muto
  • Publication number: 20020046733
    Abstract: Flow amount calculation controller controls a certain subject based on a flow amount of fluid, passing through a variable throttle portion provided in an air passage, calculated from an upstream pressure Pu, an upstream density &rgr;u, a downstream pressure Pd, an opening area Ad and a specific heat ratio k by the following formula.
    Type: Application
    Filed: October 18, 2001
    Publication date: April 25, 2002
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Kobayashi, Akira Ohata, Harufumi Muto, Hisayo Dohta
  • Publication number: 20020035868
    Abstract: An intake air-flow rate detecting apparatus of an internal combustion engine according to the present invention has a thermal air-flow sensor for detecting an intake air-flow rate of the internal combustion engine, and a response lag compensator for compensating for a response lag of the air-flow sensor, using a first-order lag element concerning a heat release amount in the air-flow sensor. Since the response lag process is carried out on the dimension of the heat release amount, the response lag of the air-flow sensor can be compensated for with accuracy and the response lag of the thermal air-flow sensor can be compensated for with high accuracy.
    Type: Application
    Filed: August 10, 2001
    Publication date: March 28, 2002
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Harufumi Muto, Daisuke Kobayashi, Satoshi Furukawa
  • Patent number: 6343586
    Abstract: A control apparatus of an internal combustion engine is able to effectively suppress vibration occurring upon acceleration of a motor vehicle due to an increase in the torque generated by the engine. The apparatus controls the ignition timing in accordance with variations in the acceleration of the motor vehicle, so as to variably control the torque generated by the engine. Upon the start of variable torque control, a controller controls the opening amount of the throttle valve to be larger than the opening amount originally determined depending upon the current operating conditions of the engine. As a result, the generated torque is allowed to be larger than the normally generated torque during variable torque control, and vibration upon acceleration can be effectively suppressed.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: February 5, 2002
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Makoto Fujita, Naoto Kushi
  • Patent number: 6332450
    Abstract: In a throttle control apparatus of an internal combustion engine, when the driver operates an accelerator so as to cause a motor vehicle to proceed to a steady-state running mode, a target throttle opening amount is no longer controlled to a throttle opening amount that depends upon an operated amount of the accelerator. Instead, the throttle opening amount is controlled to a value that provides a steady-state required torque. In this manner, the vehicle is immediately brought into a desired steady-state running mode, without requiring the driver to repeatedly operate the accelerator since the accelerator operation is not directly reflected by the throttle opening amount. Thus, the driver need not frequently repeat accelerator operations when the vehicle enters a steady-state running mode, thus assuring improved driveability.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: December 25, 2001
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Kei Masuda, Makoto Fujita, Naoto Kushi
  • Patent number: 6318349
    Abstract: An air-fuel ratio control apparatus of an internal combustion engine is provided which enables highly accurate calibration of an air-fuel feedback correction value to be completed in a short time, thus avoiding adverse influences on the emissions. The engine load is fixed when the air-fuel ratio or purge concentration is calibrated from the behavior of the air-fuel ratio feedback correction value. Thus, no change is observed in the engine load even if the driver operates the accelerator pedal to adjust the accelerator pedal position so as to change the required torque, and the air-fuel ratio of the air-fuel mixture is stabilized. Accordingly, air-fuel ratio calibration or purge concentration calibration can be promptly accomplished with high accuracy. Furthermore, while the engine load is being adjusted, the output torque is controlled in accordance with the required torque by adjusting the ignition timing.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: November 20, 2001
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Makoto Fujita, Naoto Kushi
  • Patent number: 6298839
    Abstract: An air-fuel ratio control apparatus performs an intake air-increasing process based on a region of an air-fuel ratio feedback adjustment coefficient FAF in which the adjustment coefficient decreases the fuel concentration in an air-fuel mixture. The apparatus calculates a fuel injection valve open duration TAU by using a newly calculated air-fuel ratio feedback adjustment coefficient FAFx, instead of using an adjustment coefficient FAF. An air-fuel ratio-increasing feedback adjustment coefficient FVLV in the adjustment coefficient FAFx has a value that cancels an increase in the amount of intake air. Therefore, the fuel injection amount is increased only when the fuel concentration in the mixture is an intake air-increasing process. Hence, torque difference between fuel concentration-increasing and concentration-decreasing control becomes smaller.
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: October 9, 2001
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Makoto Fujita, Naoto Kushi
  • Patent number: 6234156
    Abstract: An apparatus for controlling air-fuel ratio in an engine provided with a fuel vapor purging system. The purging system sends the fuel vapor in a fuel tank to an intake passage. The actual air-fuel ratio is computed from the oxygen concentration of the exhaust gas. An electronic control unit (ECU) adjusts the amount of fuel injected from an injector. The ECU sets a feedback correction coefficient FAF to correct the difference between the actual air-fuel ratio and a predetermined target air-fuel ratio. The feedback correction coefficient FAF is feedback controlled. The ECU further considers fluctuations of the air-fuel ratio caused by the purging system in accordance with the operating state and operating history of the engine.
    Type: Grant
    Filed: August 11, 1999
    Date of Patent: May 22, 2001
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Harufumi Muto
  • Patent number: 6186131
    Abstract: The engine of the present invention has a plurality of cylinders that are divided into a first group and a second group. An air flow meter for detecting an amount of air supplied to the engine is provided downstream of an air cleaner in an intake system. A crank angle sensor for detecting a rotational speed of the engine is provided adjacent to a crank shaft. The amount of air distributed to the first group and the amount of air distributed to the second group are calculated based on the detected amount of air and the detected rotational speed of the engine. The amount of fuel injected into the first group and the amount of fuel injected into the second group are corrected according to the calculated amounts of air distributed to the first and second groups.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: February 13, 2001
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Noritake Mitsutani, Harufumi Muto