Patents by Inventor Jiro Takagi
Jiro Takagi 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).
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Patent number: 9115656Abstract: A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio.Type: GrantFiled: March 13, 2015Date of Patent: August 25, 2015Assignee: HONDA MOTOR CO., LTD.Inventors: Yosuke Kosaka, Daisuke Shiomi, Jiro Takagi, Masaya Agata, Kentaro Onuma, Shinobu Ochiai
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Patent number: 9109528Abstract: A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio.Type: GrantFiled: March 13, 2015Date of Patent: August 18, 2015Assignee: HONDA MOTOR CO., LTD.Inventors: Yosuke Kosaka, Daisuke Shiomi, Jiro Takagi, Masaya Agata, Kentaro Onuma, Shinobu Ochiai
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Patent number: 9103291Abstract: A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio.Type: GrantFiled: March 13, 2015Date of Patent: August 11, 2015Assignee: HONDA MOTOR CO., LTD.Inventors: Yosuke Kosaka, Daisuke Shiomi, Jiro Takagi, Masaya Agata, Kentaro Onuma, Shinobu Ochiai
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Publication number: 20150184601Abstract: A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio.Type: ApplicationFiled: March 13, 2015Publication date: July 2, 2015Applicant: HONDA MOTOR CO., LTD.Inventors: Yosuke Kosaka, Daisuke Shiomi, Jiro Takagi, Masaya Agata, Kentaro Onuma, Shinobu Ochiai
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Publication number: 20150184602Abstract: A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio.Type: ApplicationFiled: March 13, 2015Publication date: July 2, 2015Applicant: HONDA MOTOR CO., LTD.Inventors: Yosuke Kosaka, Daisuke Shiomi, Jiro Takagi, Masaya Agata, Kentaro Onuma, Shinobu Ochiai
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Publication number: 20150184608Abstract: A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio.Type: ApplicationFiled: March 13, 2015Publication date: July 2, 2015Applicant: HONDA MOTOR CO., LTD.Inventors: Yosuke Kosaka, Daisuke Shiomi, Jiro Takagi, Masaya Agata, Kentaro Onuma, Shinobu Ochiai
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Patent number: 9014950Abstract: A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio.Type: GrantFiled: June 29, 2011Date of Patent: April 21, 2015Assignee: Honda Motor Co., Ltd.Inventors: Yosuke Kosaka, Daisuke Shiomi, Jiro Takagi, Masaya Agata, Kentaro Onuma, Shinobu Ochiai
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Patent number: 8731856Abstract: A frequency spectrum analyzing apparatus for performing a frequency spectrum analysis with respect to a detected value of an operating parameter of an internal combustion engine in synchronism with rotation of the engine, is provided. The operating parameter is sampled at predetermined time intervals, and the sampled value is converted to a digital value. Intensities of first and second elements are calculated with respect to a predetermined number of the sampled values, wherein the first and second elements respectively correspond to a plurality of frequency components contained in the detected value, and a phase of the second element differs from a phase of the first element by 90 degrees. Frequency component intensities corresponding to the plurality of frequencies are calculated in synchronism with rotation of the engine, using the first element intensities and the second element intensities.Type: GrantFiled: January 27, 2010Date of Patent: May 20, 2014Assignee: Honda Motor Co., Ltd.Inventors: Natsuko Kitamura, Jiro Takagi, Atsushi Kurauchi, Hirotaka Komatsu, Masayuki Yoshiiri
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Patent number: 8725463Abstract: A frequency spectrum analyzing apparatus for performing a frequency spectrum analysis with respect to a detected value of an operating parameter of an internal combustion engine in synchronism with rotation of the engine, is provided. The operating parameter is sampled at predetermined time intervals, and a sampled value is converted to a digital value. Intensities of first and second elements are calculated with respect to a predetermined number of the sampled values. The first elements and second elements respectively correspond to a plurality of frequency components contained in the detected value, and a phase of the second element differs from a phase of the first element by 90 degrees. Frequency component intensities corresponding to the plurality of frequency components are calculated in synchronism with rotation of the engine, using the first element intensities and the second element intensities.Type: GrantFiled: September 9, 2009Date of Patent: May 13, 2014Assignee: Honda Motor Co., Ltd.Inventors: Natsuko Kitamura, Yoshiaki Akimoto, Jiro Takagi, Atsushi Kurauchi, Masayuki Yoshiiri, Hirotaka Komatsu, Kazuhiko Hirota, Makoto Murakami
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Patent number: 8606489Abstract: An ignition timing control system for an internal combustion engine, for controlling an ignition timing of the engine, is provided. A charging efficiency of the engine is calculated according to the intake air flow rate and the engine rotational speed which are detected, and a knock limit ignition timing is calculated according to the engine rotational speed and the charging efficiency. A knock correction value is calculated according to the knocking detection result by a knock sensor, and a learning parameter table, in which first and second learning parameters are set, is updated based on the engine rotational speed and the knock correction value when the knocking is detected. The learning parameter table is retrieved according to the engine rotational speed, to calculate the first and second learning parameters.Type: GrantFiled: January 28, 2010Date of Patent: December 10, 2013Assignee: Honda Motor Co., Ltd.Inventors: Masayuki Yoshiiri, Jiro Takagi, Hirotaka Komatsu, Kazuhiko Hirota, Atsushi Kurauchi, Natsuko Kitamura
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Patent number: 8326518Abstract: A knocking detecting apparatus for an internal combustion engine, which can more accurately perform the knocking determination based on frequency components of the output signal of the knock sensor, is provided. A frequency spectrum analysis of the knock sensor output signal is performed at predetermined angular intervals of the crankshaft rotation angle. Intensities of a plurality of frequency components obtained by the frequency spectrum analysis are stored as time series data. The time series data of the frequency component intensity are binarized, and it is determined whether or not a knocking has occurred based on the binarized time series data.Type: GrantFiled: March 9, 2009Date of Patent: December 4, 2012Assignee: Honda Motor Co., Ltd.Inventors: Hirotaka Komatsu, Jiro Takagi, Atsushi Kurauchi, Masayuki Yoshiiri, Kazuhiko Hirota, Natsuko Kitamura, Yoshiaki Akimoto
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Publication number: 20120053822Abstract: A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine. A target intake air amount of the engine is calculated, and an intake pressure of the engine is estimated. A wide-open intake air amount is calculated according to the engine rotational speed, and a theoretical intake air amount is calculated according to the wide-open intake air amount and the intake pressure. The wide-open intake air amount is an intake air amount corresponding to a state where the throttle valve is fully opened, and the theoretical intake air amount is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine. further, an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the target intake air amount, and a target output torque of the engine is calculated using the target intake air amount and the exhaust gas recirculation ratio.Type: ApplicationFiled: June 29, 2011Publication date: March 1, 2012Applicant: HONDA MOTOR CO., LTD.Inventors: Yosuke Kosaka, Daisuke Shiomi, Jiro Takagi, Masaya Agata, Kentaro Onuma, Shinobu Ochiai
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Publication number: 20110282562Abstract: An ignition timing control system for an internal combustion engine, for controlling an ignition timing of the engine, is provided. A charging efficiency of the engine is calculated according to the intake air flow rate and the engine rotational speed which are detected, and a knock limit ignition timing is calculated according to the engine rotational speed and the charging efficiency. A knock correction value is calculated according to the knocking detection result by a knock sensor, and a learning parameter table, in which first and second learning parameters are set, is updated based on the engine rotational speed and the knock correction value when the knocking is detected. The learning parameter table is retrieved according to the engine rotational speed, to calculate the first and second learning parameters.Type: ApplicationFiled: January 28, 2010Publication date: November 17, 2011Applicant: HONDA MOTOR CO., LTD.Inventors: Masayuki Yoshiri, Jiro Takagi, Hirotaka Komatsu, Kazuhiko Hirota, Atsushi Kurauchi, Natsuko Kitamura
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Publication number: 20110276293Abstract: A frequency spectrum analyzing apparatus for performing a frequency spectrum analysis with respect to a detected value of an operating parameter of an internal combustion engine in synchronism with rotation of the engine, is provided. The operating parameter is sampled at predetermined time intervals, and the sampled value is converted to a digital value. Intensities of first and second elements are calculated with respect to a predetermined number of the sampled values, wherein the first and second elements respectively correspond to a plurality of frequency components contained in the detected value, and a phase of the second element differs from a phase of the first element by 90 degrees. Frequency component intensities corresponding to the plurality of frequencies are calculated in synchronism with rotation of the engine, using the first element intensities and the second element intensities.Type: ApplicationFiled: January 27, 2010Publication date: November 10, 2011Applicant: HONDA MOTOR CO., LTD.Inventors: Natsuko Kitamura, Jiro Takagi, Atsushi Kurauchi, Hirotaka Komatsu, Masayuki Yoshiiri
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Publication number: 20110178750Abstract: A frequency spectrum analyzing apparatus for performing a frequency spectrum analysis with respect to a detected value of an operating parameter of an internal combustion engine in synchronism with rotation of the engine, is provided. The operating parameter is sampled at predetermined time intervals, and a sampled value is converted to a digital value. Intensities of first and second elements are calculated with respect to a predetermined number of the sampled values. The first elements and second elements respectively correspond to a plurality of frequency components contained in the detected value, and a phase of the second element differs from a phase of the first element by 90 degrees. Frequency component intensities corresponding to the plurality of frequency components are calculated in synchronism with rotation of the engine, using the first element intensities and the second element intensities.Type: ApplicationFiled: September 9, 2009Publication date: July 21, 2011Applicant: HONDA MOTOR CO., LTD.Inventors: Natsuko Kitamura, Yoshiaki Akimoto, Jiro Takagi, Atsushi Kurauchi, Masayuki Yoshiiri, Hirotaka Komatsu, Kazuhiko Hirota, Makoto Murakami
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Publication number: 20110118960Abstract: A knocking detecting apparatus for an internal combustion engine, which can more accurately perform the knocking determination based on frequency components of the output signal of the knock sensor, is provided. A frequency spectrum analysis of the knock sensor output signal is performed at predetermined angular intervals of the crankshaft rotation angle. Intensities of a plurality of frequency components obtained by the frequency spectrum analysis are stored as time series data. The time series data of the frequency component intensity are binarized, and it is determined whether or not a knocking has occurred based on the binarized time series data.Type: ApplicationFiled: March 9, 2009Publication date: May 19, 2011Applicant: HONDA MOTOR CO., LTD.Inventors: Hirotaka Komatsu, Jiro Takagi, Atsushi Kurauchi, Masayuki Yoshiri, Kazuhiko Hirota, Natsuko Kitamura, Yoshiaki Akimoto
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Patent number: 7438665Abstract: A control system for an internal combustion engine having a plurality of cylinders and a switching mechanism for switching between an all-cylinder operation in which all of the plurality of cylinders are operated and a partial-cylinder operation in which at least one of the plurality of cylinders is halted. A condition for performing the partial-cylinder operation is determined, based on the detected operating parameters of the vehicle driven by the engine. A result of the determination is modified so that the partial-cylinder operation may be continued, when the detected operating parameters satisfy a predetermined continuation condition within a predetermined time period from the time a vehicle operating state where the condition for performing the partial-cylinder operation is satisfied, has changed to another vehicle operating state where the condition for performing the partial-cylinder operation is not satisfied.Type: GrantFiled: October 30, 2006Date of Patent: October 21, 2008Assignee: Honda Motor Co., Ltd.Inventors: Jiro Takagi, Yasuaki Asaki, Nobuyuki Kawaguchi, Makoto Segawa, Hirosuke Niwa
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Publication number: 20070042863Abstract: A control system for an internal combustion engine having a plurality of cylinders and a switching mechanism for switching between an all-cylinder operation in which all of the plurality of cylinders are operated and a partial-cylinder operation in which at least one of the plurality of cylinders is halted. A condition for performing the partial-cylinder operation is determined, based on the detected operating parameters of the vehicle driven by the engine. A result of the determination is modified so that the partial-cylinder operation may be continued, when the detected operating parameters satisfy a predetermined continuation condition within a predetermined time period from the time a vehicle operating state where the condition for performing the partial-cylinder operation is satisfied, has changed to another vehicle operating state where the condition for performing the partial-cylinder operation is not satisfied.Type: ApplicationFiled: October 30, 2006Publication date: February 22, 2007Applicant: Honda Motor Co., Ltd.Inventors: Jiro Takagi, Yasuaki Asaki, Nobuyuki Kawaguchi, Makoto Segawa, Hirosuke Niwa
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Patent number: 7169080Abstract: A control system for an internal combustion engine having a plurality of cylinders and a switching mechanism for switching between an all-cylinder operation in which all of the plurality of cylinders are operated and a partial-cylinder operation in which at least one of the plurality of cylinders is halted. A condition for performing the partial-cylinder operation is determined, based on the detected operating parameters of the vehicle driven by the engine. A result of the determination is modified so that the partial-cylinder operation may be continued, when the detected operating parameters satisfy a predetermined continuation condition within a predetermined time period from the time a vehicle operating state where the condition for performing the partial-cylinder operation is satisfied, has changed to another vehicle operating state where the condition for performing the partial-cylinder operation is not satisfied.Type: GrantFiled: April 15, 2004Date of Patent: January 30, 2007Assignee: Honda Motor Co., Ltd.Inventors: Jiro Takagi, Yasuaki Asaki, Nobuyuki Kawaguchi, Makoto Segawa, Hirosuke Niwa
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Patent number: 6947828Abstract: A knock control system for an internal combustion engine having a plurality of cylinders. Operation of the engine is switchable between a partial-cylinder operation for operating some of the cylinders and an all-cylinder operation for operating all of the cylinders. A determination threshold for determining knocking is set according to an output signal from the knock sensor. A level of the output signal from the knock sensor is compared with the determination threshold, and occurrence of knocking is determined according to a result of the comparison. The determination threshold used during the partial-cylinder operation is set to a value less than a value of the determination threshold used during the all-cylinder operation.Type: GrantFiled: February 2, 2004Date of Patent: September 20, 2005Assignee: Honda Motor Co., Ltd.Inventors: Mikio Fujiwara, Yasuaki Asaki, Jiro Takagi, Hirosuke Niwa