Patents by Inventor Yasuyuki Takama
Yasuyuki Takama 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: 11767802Abstract: A CPU prompts a user to drive a vehicle to a repair shop by operating a display when an amount of PM deposited in a GPF increases. When a regeneration request for the GPF is input from a shop-side terminal in the repair shop, the CPU performs a regeneration process in a state in which the vehicle stops. The CPU controls a temperature of the GPF such that the temperature at the time of execution of the regeneration process becomes lower when an opening/closing member is in a closed state than when the opening/closing member is in an open state.Type: GrantFiled: September 16, 2022Date of Patent: September 26, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuki Nose, Yuto Ikeda, Yasuyuki Takama
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Publication number: 20230119192Abstract: A CPU prompts a user to drive a vehicle to a repair shop by operating a display when an amount of PM deposited in a GPF increases. When a regeneration request for the GPF is input from a shop-side terminal in the repair shop, the CPU performs a regeneration process in a state in which the vehicle stops. The CPU controls a temperature of the GPF such that the temperature at the time of execution of the regeneration process becomes lower when an opening/closing member is in a closed state than when the opening/closing member is in an open state.Type: ApplicationFiled: September 16, 2022Publication date: April 20, 2023Inventors: Yuki NOSE, Yuto IKEDA, Yasuyuki TAKAMA
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Patent number: 10012165Abstract: A control device for an internal combustion engine is provided. The control device includes an electronic control unit. The electronic control unit is configured to set a target air-fuel ratio to a rich air-fuel ratio from a time at which fuel cut control for terminating fuel supply to a combustion chamber during operation of the internal combustion engine is terminated to a time at which an output air-fuel ratio of a downstream-side air-fuel ratio sensor becomes a rich determination air-fuel ratio or lower, temporarily set the target air-fuel ratio to the rich air-fuel ratio after the output air-fuel ratio of the downstream-side air-fuel ratio sensor becomes the rich determination air-fuel ratio or lower, and thereafter set the target air-fuel ratio to a lean air-fuel ratio.Type: GrantFiled: May 22, 2015Date of Patent: July 3, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Norifumi Takada, Yasuyuki Takama, Yuji Miyoshi
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Publication number: 20170101953Abstract: A control device for an internal combustion engine is provided. The control device includes an electronic control unit. The electronic control unit is configured to set a target air-fuel ratio to a rich air-fuel ratio from a time at which fuel cut control for terminating fuel supply to a combustion chamber during operation of the internal combustion engine is terminated to a time at which an output air-fuel ratio of a downstream-side air-fuel ratio sensor becomes a rich determination air-fuel ratio or lower, temporarily set the target air-fuel ratio to the rich air-fuel ratio after the output air-fuel ratio of the downstream-side air-fuel ratio sensor becomes the rich determination air-fuel ratio or lower, and thereafter set the target air-fuel ratio to a lean air-fuel ratio.Type: ApplicationFiled: May 22, 2015Publication date: April 13, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Norifumi TAKADA, Yasuyuki TAKAMA, Yuji MIYOSHI
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Patent number: 9371762Abstract: A catalyst protection device includes: a catalyst provided in an exhaust system of an internal combustion engine and purifying exhaust gas; a bed temperature acquisition unit acquiring a current bed temperature of the catalyst; a base increase value calculation unit calculating a base increase value that is a base value of an increase value of a fuel injection amount injected by a fuel injection valve included in the internal combustion engine in order to cool the catalyst when the current bed temperature exceeds a predetermined determination value; a compensator acquiring a corrected increase value by correcting the base increase value using a reduction coefficient that is calculated by incorporating a value of a target bed temperature set to a value strictly lower than the determination value; and an injection amount increasing unit selecting any one of the base increase value and the corrected increase value.Type: GrantFiled: May 30, 2013Date of Patent: June 21, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shinya Kondo, Yasuyuki Takama, Koji Aso
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Patent number: 9228465Abstract: A catalyst protection device includes: a catalyst provided in an exhaust system of an internal combustion engine; a bed temperature acquisition unit that acquires a bed temperature for each of a plurality of regions of the catalyst distributed in an exhaust gas flow direction; and a fuel injection unit that determines for each of the regions whether an increase in fuel injection amount is required on the basis of the corresponding bed temperature acquired by the bed temperature acquisition unit, that calculates an increase in fuel injection amount for each region and that injects fuel of an amount including the sum of the calculated increase values.Type: GrantFiled: May 30, 2013Date of Patent: January 5, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shinya Kondo, Yasuyuki Takama, Koji Aso
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Publication number: 20150135682Abstract: A catalyst protection device includes: a catalyst provided in an exhaust system of an internal combustion engine; a bed temperature acquisition unit that acquires a bed temperature for each of a plurality of regions of the catalyst distributed in an exhaust gas flow direction; and a fuel injection unit that determines for each of the regions whether an increase in fuel injection amount is required on the basis of the corresponding bed temperature acquired by the bed temperature acquisition unit, that calculates an increase in fuel injection amount for each region and that injects fuel of an amount including the sum of the calculated increase values.Type: ApplicationFiled: May 30, 2013Publication date: May 21, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shinya Kondo, Yasuyuki Takama, Koji Aso
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Publication number: 20150128567Abstract: A catalyst protection device includes: a catalyst provided in an exhaust system of an internal combustion engine and purifying exhaust gas; a bed temperature acquisition unit acquiring a current bed temperature of the catalyst; a base increase value calculation unit calculating a base increase value that is a base value of an increase value of a fuel injection amount injected by a fuel injection valve included in the internal combustion engine in order to cool the catalyst when the current bed temperature exceeds a predetermined determination value; a compensator acquiring a corrected increase value by correcting the base increase value using a reduction coefficient that is calculated by incorporating a value of a target bed temperature set to a value strictly lower than the determination value; and an injection amount increasing unit selecting any one of the base increase value and the corrected increase value.Type: ApplicationFiled: May 30, 2013Publication date: May 14, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shinya Kondo, Yasuyuki Takama, Koji Aso
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Patent number: 8798893Abstract: A fuel injection control for an internal combustion engine includes: estimating a convergence temperature of the exhaust gas catalytic converter; calculating an OTP boost value using the estimated convergence temperature; and estimating the convergence temperature on the assumption that the temperature decrement quantity of the exhaust gas catalytic converter which is caused by the power boosting is zero when both of the OTP boosting execution condition and the power boosting execution condition are met.Type: GrantFiled: February 8, 2012Date of Patent: August 5, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Masahiro Kachi, Yasuyuki Takama
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Publication number: 20120271534Abstract: A control device for an internal combustion engine with a catalyst includes: an air-fuel ratio control unit varying a fuel amount supplied to the engine in accordance with a first variation amount set such that an air-fuel ratio of air-fuel mixture coincides with a target ratio; and an exhaust gas temperature control unit varying a fuel amount supplied to the engine in accordance with a second variation amount set to decrease an exhaust gas temperature. When air-fuel ratio control is being executed at a first time point and at least exhaust gas temperature control is executed during a period from the first time point or later to a third time point thereafter, the first and second variation amounts at a fourth time point in the period are set so as to be larger than or equal to the first variation amount at the first time point.Type: ApplicationFiled: April 19, 2012Publication date: October 25, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Masahiro KACHI, Shinya KONDO, Yasuyuki TAKAMA
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Publication number: 20120203445Abstract: A fuel injection control for an internal combustion engine includes: estimating a convergence temperature of the exhaust gas catalytic converter; calculating an OTP boost value using the estimated convergence temperature; and estimating the convergence temperature on the assumption that the temperature decrement quantity of the exhaust gas catalytic converter which is caused by the power boosting is zero when both of the OTP boosting execution condition and the power boosting execution condition are met.Type: ApplicationFiled: February 8, 2012Publication date: August 9, 2012Applicant: Toyota Jidosha Kabushiki KaishaInventors: Masahiro Kachi, Yasuyuki Takama
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Patent number: 7861514Abstract: During deterioration detection of a catalyst, exhaust gas of a lean air/fuel ratio and exhaust gas of a rich air/fuel ratio are alternately supplied to the catalyst, and decrease of the O2 storage function is detected by obtaining the oxygen occlusion amount in the catalyst, based upon the timing at which, after changeover of the air/fuel ratio of the exhaust gas flowing into the catalyst, the air/fuel ratio of the exhaust gas passed through the catalyst changes to track that air/fuel ratio of the exhaust gas flowing into the catalyst. At this time, the rich air/fuel ratio of the exhaust gas and the lean air/fuel ratio of the exhaust gas supplied to the catalyst are set closer to the stoichiometric air/fuel ratio, the larger is the exhaust flow amount.Type: GrantFiled: October 20, 2006Date of Patent: January 4, 2011Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takahiko Fujiwara, Yasuyuki Takama
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Patent number: 7398148Abstract: The valve timing is changed to increase the internal EGR amount the moment a fuel cut process begins (FIG. 2C). Before a sufficient amount of internal EGR is obtained, control is exercised so that the throttle-opening angle TA is larger than a basic idle-opening angle TA0. When a sufficient amount of internal EGR is obtained, control is exercised so that the throttle-opening angle TA is smaller than the basic idle-opening angle TA0 (FIG. 2D). The increase in the internal EGR amount is rendered smaller during fuel cut at a low rotation speed than during fuel cut at a high rotation speed. In addition, the amount of decrease in the throttle-opening angle TA is rendered smaller during fuel cut at a low rotation speed than during fuel cut at a high rotation speed.Type: GrantFiled: September 9, 2005Date of Patent: July 8, 2008Assignee: Toyota Jidosha Kabushiki KaishaInventors: Mamoru Yoshioka, Yasuyuki Takama
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Publication number: 20070250250Abstract: The valve timing is changed to increase the internal EGR amount the moment a fuel cut process begins (FIG. 2C). Before a sufficient amount of internal EGR is obtained, control is exercised so that the throttle-opening angle TA is larger than a basic idle-opening angle TA0. When a sufficient amount of internal EGR is obtained, control is exercised so that the throttle-opening angle TA is smaller than the basic idle-opening angle TA0 (FIG. 2D). The increase in the internal EGR amount is rendered smaller during fuel cut at a low rotation speed than during fuel cut at a high rotation speed. In addition, the amount of decrease in the throttle-opening angle TA is rendered smaller during fuel cut at a low rotation speed than during fuel cut at a high rotation speed.Type: ApplicationFiled: September 9, 2005Publication date: October 25, 2007Applicant: Toyota Jidosha Kabushiki KaishaInventors: Mamoru Yoshioka, Yasuyuki Takama
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Publication number: 20070089398Abstract: During deterioration detection of a catalyst, exhaust gas of a lean air/fuel ratio and exhaust gas of a rich air/fuel ratio are alternately supplied to the catalyst, and decrease of the O2 storage function is detected by obtaining the oxygen occlusion amount in the catalyst, based upon the timing at which, after changeover of the air/fuel ratio of the exhaust gas flowing into the catalyst, the air/fuel ratio of the exhaust gas passed through the catalyst changes to track that air/fuel ratio of the exhaust gas flowing into the catalyst. At this time, the rich air/fuel ratio of the exhaust gas and the lean air/fuel ratio of the exhaust gas supplied to the catalyst are set closer to the stoichiometric air/fuel ratio, the larger is the exhaust flow amount.Type: ApplicationFiled: October 20, 2006Publication date: April 26, 2007Inventors: Takahiko Fujiwara, Yasuyuki Takama
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Patent number: 7032571Abstract: From the start of the engine to the detection of an engine speed peak, a control parameter (e.g., ignition timing) different from an air intake rate relating to an engine output is set to a value at which the engine output decreases than at an idling value. After detection of the peak, the control parameter is adjusted to the idling value.Type: GrantFiled: December 27, 2004Date of Patent: April 25, 2006Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yasuyuki Takama, Mamoru Yoshioka
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Publication number: 20050145217Abstract: From the start of the engine to the detection of an engine speed peak, a control parameter (e.g., ignition timing) different from an air intake rate relating to an engine output is set to a value at which the engine output decreases than at an idling value. After detection of the peak, the control parameter is adjusted to the idling value.Type: ApplicationFiled: December 27, 2004Publication date: July 7, 2005Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yasuyuki Takama, Mamoru Yoshioka