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).

  • Publication number: 20180274428
    Abstract: A NOx sensor abnormality detector for a NOx sensor includes a measurement chamber, a pump cell, and a sensor cell. The NOx sensor abnormality detector includes a signal receiving section configured to receive the detection value of the sensor cell, a reduction process executing section configured to execute a reduction process that reduces the discharge function of the pump cell, and an abnormality determining section configured to perform abnormality determination of the NOx sensor. The NOx sensor abnormality detector is configured to execute abnormality detection control in which the abnormality determining section performs abnormality determination of the NOx sensor based on the detection value of the sensor cell, which is input to the signal receiving section, after the reduction process executing section starts the reduction process.
    Type: Application
    Filed: March 13, 2018
    Publication date: September 27, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshitaka NAKAMURA, Harufumi MUTO, Tomomi ONISHI, Yosuke HASHIMOTO, Koichi TSUJI
  • Patent number: 7703436
    Abstract: A control device of an internal combustion engine determining a target throttle opening degree based on a target intake air amount which can simply and reliably detect any control abnormality is provided. The control device of an internal combustion engine determining a target throttle opening degree based on a target intake amount compares the target intake air amount and an intake air amount measured by an air flow meter to detect a control abnormality. By this control device, it is possible to simply and reliably detect a control abnormality in the process of determination of the target throttle opening degree or control of the throttle valve.
    Type: Grant
    Filed: October 11, 2005
    Date of Patent: April 27, 2010
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Yuichiro Ido
  • Patent number: 7424872
    Abstract: A failure diagnosis for a slide sensor of a variable valve mechanism is performed when a valve working angle is at a value in the initial state. The initial state is set to a valve characteristic state where the valve working angle is at the maximum value. The maximum valve working angle corresponds to the refuge running performable region in which an engine can be started and refuge running can be performed. Therefore, even when it is difficult to adjust the valve working angle using rotation of a spiral cam due to a failure in the slide sensor, the refuge running can be performed only by maintaining the initial state by maintaining control. It is thus possible to increase reliability of the refuge running in the case where a failure has occurred in the variable valve mechanism.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: September 16, 2008
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Naohide Fuwa, Harufumi Muto
  • Patent number: 7373922
    Abstract: An apparatus and method for controlling the intake air amount in an internal combustion engine provided with a throttle valve and an intake air amount changing means linked with the same, the intake air amount control apparatus and method of an internal combustion engine finding a target intake air amount mcta based on an accelerator opening degree and engine speed (step 101), determining a target setting Cvta for said intake air amount changing means based on at least said target intake air amount (step 103), and finding a target throttle opening degree ?tta based on model equations creating a model of an engine intake system and expressing the air passing through the engine intake system from said target intake air amount mcta and the target setting Cvta (step 107).
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: May 20, 2008
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Yuji Miyanoo, Akira Eiraku, Masashi Hakariya
  • Publication number: 20070240680
    Abstract: A control device of an internal combustion engine determining a target throttle opening degree based on a target intake air amount which can simply and reliably detect any control abnormality is provided. The control device of an internal combustion engine determining a target throttle opening degree based on a target intake amount compares the target intake air amount and an intake air amount measured by an air flow meter to detect a control abnormality. By this control device, it is possible to simply and reliably detect a control abnormality in the process of determination of the target throttle opening degree or control of the throttle valve.
    Type: Application
    Filed: October 11, 2005
    Publication date: October 18, 2007
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Yuichiro Ido
  • Patent number: 7263428
    Abstract: A cylinder inflow exhaust gas amount calculation system of an internal combustion engine provided with an intake passage, an exhaust passage, an exhaust gas recirculation passage connecting the intake passage and exhaust passage, and an exhaust gas flow rate control valve arranged in the exhaust gas recirculation passage for controlling the flow rate of the exhaust gas flowing in the exhaust gas recirculation passage, and the system calculating an amount of cylinder inflow exhaust gas defined as an amount of exhaust gas flowing into a cylinder, utilizing an amount of passage exhaust gas defined as an amount of exhaust gas passing through the exhaust gas flow rate control valve, wherein an amount of cylinder inflow exhaust gas is calculated considering the dead time corresponding to the time taken until the exhaust gas passing through the exhaust gas flow rate control valve reaches the cylinder and a tracking lag of a change in the amount of cylinder inflow exhaust gas with respect to a change in the amount of
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: August 28, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Daisuke Kobayashi, Harufumi Muto, Masato Ehara, Jyunichi Kako
  • Patent number: 7213569
    Abstract: A valve characteristic estimation device applied to an internal combustion engine provided with a valve characteristic adjustment mechanism for varying a valve characteristic including at least one of a valve open period and a lift amount of an intake valve. The estimation device detects intake air amount and intake air pressure of the engine, and calculates an estimated value for the valve characteristic based on the detected values of the intake air amount and the intake air pressure. Accordingly, the valve characteristic of the intake valve is accurately estimated.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: May 8, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Naohide Fuwa, Harufumi Muto
  • Patent number: 7204231
    Abstract: A control device of an internal combustion engine which determines a target throttle opening degree in accordance with a required intake pipe internal pressure and which suppresses the occurrence of hunting of the throttle opening degree is provided, wherein, when the required intake pipe internal pressure becomes a predetermined pressure or more, the target throttle opening degree is determined by adding an addition-corrected throttle opening degree calculated in accordance with a difference between the required intake pipe internal pressure and the predetermined pressure based on a predetermined equation to an opening degree of a throttle valve making the intake pipe internal pressure the predetermined pressure.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: April 17, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Yuichiro Ido
  • Patent number: 7201143
    Abstract: An intake amount control apparatus of an internal combustion engine in accordance with the invention includes a control portion that controls an opening amount of a throttle valve provided in an intake passageway of the internal combustion engine and operation of a lift amount changing mechanism capable of changing a lift amount of an intake valve. The control portion controls the operation of the lift amount changing mechanism so that, prior to execution of a fuel cut control at the time of an engine deceleration, the lift amount of in intake valve becomes smaller than at the time of a normal engine idle operation where the fuel cut control is not executed.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: April 10, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Kakuji Kagoshima, Yuichiro Ido
  • Patent number: 7195007
    Abstract: An intake pipe downstream of a throttle valve is interconnected with an exhaust pipe via an EGR supply pipe and an EGR control valve is disposed in the EGR supply pipe. An engine load ratio (KLoff) in the engine steady operation with the EGR gas being not supplied, and another engine load ratio KLon in the engine steady operation with the EGR gas being supplied are expressed with respective linear functions of an intake pipe pressure (Pm) and stored in advance. The intake pipe pressure (Pm) is detected, KLoff and KLon are calculated from the detected intake pipe pressure (Pm) using the linear function expressions and, then, a difference between these values ?KL (=KLoff?KLon) is calculated. Based on the difference (?KL), the EGR control valve passing-through gas amount, which is an amount of the EGR gas passing through the EGR control valve, is calculated.
    Type: Grant
    Filed: December 8, 2003
    Date of Patent: March 27, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Daisuke Kobayashi, Yuichiro Ido
  • Patent number: 7178388
    Abstract: An intake air flow detecting device is provided to an intake air passage, through which intake air flows into an internal combustion engine. Intake air flow is divided into a main passage and a bypass passage. The detecting device includes a thermal air flowmeter, a bypass flow delay information calculating means, and a response delay compensating means. The thermal air flowmeter includes a detector arranged in the bypass passage for detecting an air flow amount in the intake air passage. The bypass flow delay information calculating means calculates a bypass flow delay information representing delay in variation in a flow amount in the bypass passage with respect to variation in a flow amount in the main passage. The response delay compensating means compensates delay in response of the air flowmeter in accordance with the bypass flow delay information.
    Type: Grant
    Filed: June 14, 2005
    Date of Patent: February 20, 2007
    Assignees: Denso Corporation, Toyota Jidosha Kabushiki Kaisha
    Inventors: Yasuo Okuda, Masakazu Yamada, Satoshi Furukawa, Minoru Kondo, Noboru Kitahara, Shigeru Kamio, Harufumi Muto
  • Patent number: 7181336
    Abstract: A control system of an internal combustion engine provided with a throttle valve passage air flow calculation equation by which the throttle valve passage air flow mt is expressed as a function of the downstream side intake pipe pressure at the downstream side of the throttle valve and a cylinder intake air flow calculation equation by which the cylinder intake air flow mc is expressed as a function of the downstream side intake pipe pressure, where said downstream side intake pipe pressure Pm and cylinder intake air flow mc when the throttle valve passage air flow mt found from said throttle valve passage air flow calculation equation and the cylinder intake air flow mc found from said cylinder intake air flow calculation equation match are calculated as the downstream side intake pipe pressure Pmta and cylinder intake air flow mcta at the time of steady operation under the operating conditions at that time is provided.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: February 20, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Yuichiro Ido
  • Publication number: 20070016358
    Abstract: An intake pipe downstream of a throttle valve is interconnected with an exhaust pipe via an EGR supply pipe and an EGR control valve is disposed in the EGR supply pipe. An engine load ratio (KLoff) in the engine steady operation with the EGR gas being not supplied, and another engine load ratio KLon in the engine steady operation with the EGR gas being supplied are expressed with respective linear functions of an intake pipe pressure (Pm) and stored in advance. The intake pipe pressure (Pm) is detected, KLoff and KLon are calculated from the detected intake pipe pressure (Pm) using the linear function expressions and, then, a difference between these values ?KL (=KLoff?KLon) is calculated. Based on the difference (?KL), the EGR control valve passing-through gas amount, which is an amount of the EGR gas passing through the EGR control valve, is calculated.
    Type: Application
    Filed: December 8, 2003
    Publication date: January 18, 2007
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Harufumi Muto, Daisuke Kobayashi, Yuichiro Ido
  • Patent number: 7159453
    Abstract: A control device able to find the intake air flow rate in an internal combustion engine having a plurality of intake passages upstream of a throttle valve is provided. The control device finds the intake air flow rate of the internal combustion engine by converting an output voltage of each of air flow sensors provided in the intake passages to a flow rate based on a relationship between an output voltage and flow rate found in advance for each air flow sensor, correcting the obtained flow rate in accordance with temperature characteristics of each the air flow sensor, and adding the corrected flow rates to calculate a total flow rate.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: January 9, 2007
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Harufumi Muto, Satoshi Furukawa, Naoki Maeda
  • Publication number: 20060276954
    Abstract: An apparatus and method for controlling the intake air amount in an internal combustion engine provided with a throttle valve and an intake air amount changing means linked with the same, the intake air amount control apparatus and method of an internal combustion engine finding a target intake air amount mcta based on an accelerator opening degree and engine speed (step 101), determining a target setting Cvta for said intake air amount changing means based on at least said target intake air amount (step 103), and finding a target throttle opening degree ?tta based on model equations creating a model of an engine intake system and expressing the air passing through the engine intake system from said target intake air amount mcta and the target setting Cvta (step 107).
    Type: Application
    Filed: July 30, 2004
    Publication date: December 7, 2006
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Harufumi Muto, Yuji Miyanoo, Akira Eiraku, Masashi Hakariya
  • Publication number: 20060235603
    Abstract: A cylinder inflow exhaust gas amount calculation system of an internal combustion engine provided with an intake passage, an exhaust passage, an exhaust gas recirculation passage connecting the intake passage and exhaust passage, and an exhaust gas flow rate control valve arranged in the exhaust gas recirculation passage for controlling the flow rate of the exhaust gas flowing in the exhaust gas recirculation passage, and the system calculating an amount of cylinder inflow exhaust gas defined as an amount of exhaust gas flowing into a cylinder, utilizing an amount of passage exhaust gas defined as an amount of exhaust gas passing through the exhaust gas flow rate control valve, wherein an amount of cylinder inflow exhaust gas is calculated considering the dead time corresponding to the time taken until the exhaust gas passing through the exhaust gas flow rate control valve reaches the cylinder and a tracking lag of a change in the amount of cylinder inflow exhaust gas with respect to a change in the amount of
    Type: Application
    Filed: December 11, 2003
    Publication date: October 19, 2006
    Inventors: Daisuke Kobayashi, Harufumi Muto, Masato Ehara, Jyunichi Kako
  • Patent number: 7099767
    Abstract: An intake passage upstream of a throttle valve is divided into a plurality of intake divided-flow conduits, and air flow meters are arranged in the respective intake divided-flow conduits. The throttle opening is obtained, and a throttle valve passing-through air amount, which is an amount of air passing through the throttle valve, is calculated on the basis of the throttle opening. Each air flow meter-detecting intake air amount, which is an intake air amount to be detected by the air flow meter, assuming that air flows through each intake divided-flow conduit by a part of the throttle valve passing-through air amount, the part being determined by a divided-flow ratio of the corresponding intake divided-flow conduit, is estimated, and a total value of the estimated air flow meter-detecting intake air amounts is then estimated. The engine is controlled on the basis of the total air flow meter-detecting intake air amount.
    Type: Grant
    Filed: October 24, 2005
    Date of Patent: August 29, 2006
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Harufumi Muto, Satoshi Furukawa, Naoki Maeda
  • Patent number: 7085643
    Abstract: In a device for estimating an amount of intake air of an internal combustion engine, wherein an amount of intake air passing through the throttle valve is calculated by using of an upstream side intake air pressure upstream of the throttle valve and a downstream side intake air pressure downstream of the throttle valve, and an amount of intake air supplied into the cylinder is estimated on the basis of the amount of intake air passing through the throttle valve, the upstream side intake air pressure used at the time when the amount of intake air passing through the throttle valve is calculated is detected or calculated to take account of a pressure loss, produced by at least an air-cleaner, from the atmospheric pressure.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: August 1, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Isamu Toshimitsu, Takahiro Anami
  • Publication number: 20060161333
    Abstract: A control system of an internal combustion engine provided with a throttle valve passage air flow calculation equation by which the throttle valve passage air flow mt is expressed as a function of the downstream side intake pipe pressure at the downstream side of the throttle valve and a cylinder intake air flow calculation equation by which the cylinder intake air flow mc is expressed as a function of the downstream side intake pipe pressure, where said downstream side intake pipe pressure Pm and cylinder intake air flow mc when the throttle valve passage air flow mt found from said throttle valve passage air flow calculation equation and the cylinder intake air flow mc found from said cylinder intake air flow calculation equation match are calculated as the downstream side intake pipe pressure Pmta and cylinder intake air flow mcta at the time of steady operation under the operating conditions at that time is provided.
    Type: Application
    Filed: July 16, 2004
    Publication date: July 20, 2006
    Applicant: oyota Jidosha Kabushiki Kaisha
    Inventors: Harufumi Muto, Yuichito Ido
  • Patent number: 7069139
    Abstract: A control device for an internal combustion engine comprises an air flow meter arranged in the intake passage. The air flow meter includes a main passage and a bypass passage and detects a flow rate of air flowing through the bypass passage to detect a flow rate of air flowing through an intake passage. A current intake air flow rate is calculated based on a current throttle opening. When the rapid acceleration of the engine is in process, an air flow meter-detecting intake air flow rate, assuming that air flows through the intake passage at the current intake air flow rate, is estimated considering the pressure loss of the bypass passage of the air flow meter. When an operation other than the rapid acceleration is in process, it is estimated ignoring the pressure loss. The fuel injection amount is calculated from the estimated air flow meter-detecting intake air flow rate.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: June 27, 2006
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Harufumi Muto, Satoshi Furukawa, Isamu Toshimitsu