Patents by Inventor Yasuyuki Irisawa
Yasuyuki Irisawa 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: 9726118Abstract: An EGR apparatus includes a EGR passage and an EGR valve provided in the EGR passage to regulate an EGR flow rate in the EGR passage. An ECU closes the EGR valve from an open state prior to start of deceleration of the engine based on engine rotation speed detected by a rotation speed sensor, accelerator opening degree detected by an accelerator sensor, and actual opening degree of the EGR valve. During deceleration of the engine, the ECU obtains a target opening degree of the EGR valve according to the separately detected engine rotation speed and accelerator opening degree from a target opening degree map and starts to close the EGR valve when a difference between an actual opening degree and the target opening degree of the EGR valve exceeds a predetermined value.Type: GrantFiled: May 20, 2013Date of Patent: August 8, 2017Assignees: AISAN KOGYO KABUSHIKI KAISHA, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mamoru Yoshioka, Shinichiro Nogawa, Yasuyuki Irisawa, Hiroyuki Hokuto
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Patent number: 9604177Abstract: A decrease in an NOx removal or reduction rate at the time of filter regeneration is suppressed. To this end, provision is made for an NOx selective reduction catalyst, a filter arranged at the upstream side of the NOx selective reduction catalyst, an NH3 generation catalyst arranged at the upstream side of the NOx selective reduction catalyst to generate NH3 when the air fuel ratio of an exhaust gas is equal to or less than a stoichiometric air fuel ratio, a regeneration unit to carry out regeneration of the filter, and a generation unit to make the air fuel ratio of the exhaust gas equal to or less than the stoichiometric air fuel ratio, thereby causing NH3 to be generated in the NH3 generation catalyst, wherein the regeneration unit inhibits the regeneration of the filter until the generation of NH3 by the generation unit is completed.Type: GrantFiled: March 7, 2012Date of Patent: March 28, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuyuki Irisawa
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Patent number: 9440194Abstract: A decrease in the NOx removal or reduction rate is suppressed, while suppressing the outflow of particulate matter from a filter after regeneration of the filter.Type: GrantFiled: June 19, 2012Date of Patent: September 13, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuyuki Irisawa
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Publication number: 20160222896Abstract: An exhaust gas purification system of an internal combustion engine according to the present invention includes: processing means for executing at least one of a process of increasing an air-fuel ratio of an air-fuel mixture burned in the internal combustion engine and a process of increasing EGR gas recirculated by an EGR apparatus, when increasing a NO2 proportion in exhaust gas; and control means for controlling the processing means so that an increase in the air-fuel ratio becomes larger, and an increase in the EGR gas becomes smaller when a temperature of the exhaust gas purification apparatus is high as compared to when the temperature of the exhaust gas purification apparatus is low.Type: ApplicationFiled: July 4, 2013Publication date: August 4, 2016Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shintaro Hotta, Yasuyuki Irisawa
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Patent number: 9297289Abstract: In cases where an NOx selective reduction catalyst is provided at a location downstream of an NOx storage reduction catalyst, NOx purification performance in an exhaust gas purification apparatus as a whole is maintained, irrespective of deterioration of the NOx storage reduction catalyst. For this purpose, the reduction of NOx in the NOx storage reduction catalyst is promoted more when the degree of deterioration of the NOx storage reduction catalyst or the NOx selective reduction catalyst is low than when it is high, and the reduction of NOx in the NOx selective reduction catalyst is promoted more when the degree of deterioration of the NOx storage reduction catalyst or the NOx selective reduction catalyst is high than when it is low.Type: GrantFiled: September 6, 2011Date of Patent: March 29, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kenji Sakurai, Toru Kidokoro, Yasuyuki Irisawa, Tuyoshi Obuchi
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Patent number: 9243530Abstract: An object of the invention is to provide a fuel injection technique suitable for a spark-ignition internal combustion engine equipped with a first fuel injection valve for injecting fuel into a cylinder, a second fuel injection valve for injecting fuel into an intake passage, and a particulate filter provided in an exhaust passage thereof. To achieve the object, the fuel injection system of an internal combustion engine according to the invention reduces an in-cylinder injection ratio, which is the ratio of the quantity of fuel injected through the first fuel injection valve to the quantity of fuel injected through the second fuel injection valve, when the quantity of particulate matter trapped in the particulate filter is larger than a threshold value, thereby reducing the quantity of particulate matter discharged from the internal combustion engine.Type: GrantFiled: December 2, 2011Date of Patent: January 26, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuyuki Irisawa
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Publication number: 20150298061Abstract: A decrease in an NOx removal or reduction rate at the time of filter regeneration is suppressed. To this end, provision is made for an NOx selective reduction catalyst, a filter arranged at the upstream side of the NOx selective reduction catalyst, an NH3 generation catalyst arranged at the upstream side of the NOx selective reduction catalyst to generate NH3 when the air fuel ratio of an exhaust gas is equal to or less than a stoichiometric air fuel ratio, a regeneration unit to carry out regeneration of the filter, and a generation unit to make the air fuel ratio of the exhaust gas equal to or less than the stoichiometric air fuel ratio, thereby causing NH3 to be generated in the NH3 generation catalyst, wherein the regeneration unit inhibits the regeneration of the filter until the generation of NH3 by the generation unit is completed.Type: ApplicationFiled: March 7, 2012Publication date: October 22, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuyuki Irisawa
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Publication number: 20150285118Abstract: The present invention has for its object to provide a technology in which in an exhaust gas purification apparatus for an internal combustion engine which is provided with a catalyst for NH3 generation, and a catalyst for removing or reducing NOx in an exhaust gas by using NH3 as a reducing agent, NOx in the exhaust gas can be reduced, even in cases where the NH3 generation capacity of the catalyst for NH3 generation has become low.Type: ApplicationFiled: May 24, 2012Publication date: October 8, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yasuyuki Irisawa, Tsuyoshi Obuchi
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Publication number: 20150174529Abstract: A decrease in the NOx removal or reduction rate is suppressed, while suppressing the outflow of particulate matter from a filter after regeneration of the filter.Type: ApplicationFiled: June 19, 2012Publication date: June 25, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuyuki Irisawa
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Patent number: 9010093Abstract: In cases where at the upstream side of an NOx selective reduction catalyst there is provided another catalyst, sulfur poisoning of both the catalysts is recovered in an appropriate manner. To this end, provision is made for an NH3 generation catalyst arranged in an exhaust passage of an internal combustion engine for generating NH3, the NOx selective reduction catalyst arranged in the exhaust passage at a location downstream of the NH3 generation catalyst for reducing NOx in a selective manner, an upstream side recovery unit to recover sulfur poisoning of the NH3 generation catalyst, and a downstream side recovery unit to recover sulfur poisoning of the NOx selective reduction catalyst after the sulfur poisoning of the NH3 generation catalyst has been recovered by the upstream side recovery unit.Type: GrantFiled: September 6, 2011Date of Patent: April 21, 2015Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kenji Sakurai, Toru Kidokoro, Yasuyuki Irisawa, Yuji Miyoshi
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Patent number: 8967121Abstract: In a control of an internal combustion engine control apparatus, the control apparatus includes: a fuel tank that stores a fuel; a vaporized fuel tank that is connected to an intermediate portion of an intake passageway of an internal combustion engine and that stores a vaporized fuel that is formed by vaporization of the fuel; an in-tank fuel supply device that supplies the fuel from the fuel tank into the vaporized fuel tank; and a normally-closed vaporized fuel supply valve that opens and closes a connecting portion between the vaporized fuel tank and the intake passageway. The control apparatus estimates air/fuel ratio in the vaporized fuel tank, and produces the vaporized fuel in the vaporized fuel tank by driving the in-tank fuel supply device, with the vaporized fuel supply valve closed, until the estimated air/fuel ratio becomes substantially zero, during operation of the engine.Type: GrantFiled: June 14, 2011Date of Patent: March 3, 2015Assignee: Toyota Jidosha Kabushiki KaishaInventors: Akira Sato, Yasuyuki Irisawa, Sinichi Mitani, Takashi Tsunooka, Shigeyuki Urano, Satoshi Yoshizaki
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Patent number: 8935079Abstract: An engine includes a normal fuel tank, fuel gas tank, an in-tank injection valve and a fuel gas supply valve. During operation of the engine, in a state where the fuel gas supply valve is closed, a fuel is injected into the fuel gas tank through the in-tank injection valve to generate a fuel gas by vaporizing the fuel. The fuel gas is stored in the fuel gas tank and is maintained in the gas phase due to the natural decompression even after the engine is stopped. To start the engine, the fuel gas supply valve is opened to supply the fuel gas in the fuel gas tank to a surge tank. Thus, compared with the case where the fuel gas is generated at the start of the engine, the fuel gas can be quickly supplied into the cylinder, so that the ability to start the engine is improved.Type: GrantFiled: March 19, 2010Date of Patent: January 13, 2015Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takashi Tsunooka, Yasuyuki Irisawa, Shinichi Mitani, Satoshi Yoshizaki, Akira Satou, Shigeyuki Urano
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Publication number: 20140331653Abstract: An object of the invention is to provide a fuel injection technique suitable for a spark-ignition internal combustion engine equipped with a first fuel injection valve for injecting fuel into a cylinder, a second fuel injection valve for injecting fuel into an intake passage, and a particulate filter provided in an exhaust passage thereof. To achieve the object, the fuel injection system of an internal combustion engine according to the invention reduces an in-cylinder injection ratio, which is the ratio of the quantity of fuel injected through the first fuel injection valve to the quantity of fuel injected through the second fuel injection valve, when the quantity of particulate matter trapped in the particulate filter is larger than a threshold value, thereby reducing the quantity of particulate matter discharged from the internal combustion engine.Type: ApplicationFiled: December 2, 2011Publication date: November 13, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuyuki Irisawa
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Patent number: 8788180Abstract: An object of the present invention is to suppress the dispersion of EGR gas amount between cylinders when the stuck open state arises in an EGR valve in an EGR apparatus for an internal combustion engine in which an EGR passage is branched on an intake system side into a plurality of EGR branch pipes, and the respective EGR branch pipes are connected respectively to intake branch pipes provided for the respective cylinders. In the present invention, if the EGR valve is stuck open, the exhaust pressure is reduced in an exhaust system of the internal combustion engine, while suppressing an amount of decrease in a driving force of a vehicle which carries the internal combustion engine within an allowable range.Type: GrantFiled: August 6, 2009Date of Patent: July 22, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventor: Yasuyuki Irisawa
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Publication number: 20140190150Abstract: In cases where at the upstream side of an NOx selective reduction catalyst there is provided another catalyst, sulfur poisoning of both the catalysts is recovered in an appropriate manner. To this end, provision is made for an NH3 generation catalyst arranged in an exhaust passage of an internal combustion engine for generating NH3, the NOx selective reduction catalyst arranged in the exhaust passage at a location downstream of the NH3 generation catalyst for reducing NOx in a selective manner, an upstream side recovery unit to recover sulfur poisoning of the NH3 generation catalyst, and a downstream side recovery unit to recover sulfur poisoning of the NOx selective reduction catalyst after the sulfur poisoning of the NH3 generation catalyst has been recovered by the upstream side recovery unit.Type: ApplicationFiled: September 6, 2011Publication date: July 10, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kenji Sakurai, Toru Kidokoro, Yasuyuki Irisawa, Yuji Miyoshi
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Publication number: 20140186220Abstract: In cases where an NOx selective reduction catalyst is provided at a location downstream of an NOx storage reduction catalyst, NOx purification performance in an exhaust gas purification apparatus as a whole is maintained, irrespective of deterioration of the NOx storage reduction catalyst. For this purpose, the reduction of NOx in the NOx storage reduction catalyst is promoted more when the degree of deterioration of the NOx storage reduction catalyst or the NOx selective reduction catalyst is low than when it is high, and the reduction of NOx in the NOx selective reduction catalyst is promoted more when the degree of deterioration of the NOx storage reduction catalyst or the NOx selective reduction catalyst is high than when it is low.Type: ApplicationFiled: September 6, 2011Publication date: July 3, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kenji Sakurai, Toru Kidokoro, Yasuyuki Irisawa, Tuyoshi Obuchi
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Publication number: 20140041638Abstract: In a hybrid type vehicle designed to use an engine and motor generators to drive the vehicle, the engine is provided with a variable compression ratio mechanism and a variable valve timing mechanism. When the requested output of the engine increases, minimum fuel consumption rate maintenance control maintaining a mechanical compression ratio at a maximum mechanical compression ratio and in that state increasing the engine speed so as to satisfy the requested output of the engine and torque increase control lowering the mechanical compression ratio and increasing the engine torque are selectively performed.Type: ApplicationFiled: October 18, 2013Publication date: February 13, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuyuki IRISAWA
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Publication number: 20130312718Abstract: An EGR apparatus includes a EGR passage and an EGR valve provided in the EGR passage to regulate an EGR flow rate in the EGR passage. An ECU closes the EGR valve from an open state prior to start of deceleration of the engine based on engine rotation speed detected by a rotation speed sensor, accelerator opening degree detected by an accelerator sensor, and actual opening degree of the EGR valve. During deceleration of the engine, the ECU obtains a target opening degree of the EGR valve according to the separately detected engine rotation speed and accelerator opening degree from a target opening degree map and starts to close the EGR valve when a difference between an actual opening degree and the target opening degree of the EGR valve exceeds a predetermined value.Type: ApplicationFiled: May 20, 2013Publication date: November 28, 2013Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISAN KOGYO KABUSHIKI KAISHAInventors: Mamoru YOSHIOKA, Shinichiro NOGAWA, Yasuyuki IRISAWA, Hiroyuki HOKUTO
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Patent number: 8483900Abstract: A hybrid vehicle includes: a multi-cylinder internal combustion engine and an electric motor, a power source control unit that controls the engine and the motor, an air-fuel ratio control unit that controls the air-fuel ratio of exhaust gas of the engine to obtain a target air-fuel ratio, a battery that stores electric power that is supplied to the motor, a state-of-charge detection unit that detects a state-of-charge of the battery, a detection unit that detects an air-fuel ratio imbalance abnormality of the internal combustion engine and identifies an abnormal cylinder that has caused the imbalance abnormality, and a correction unit that corrects, in a case where the air-fuel ratio imbalance abnormality has been detected, a fuel injection amount of the abnormal cylinder based on a battery state-of-charge decrease amount from when the abnormality is detected to the time when a predetermined time interval is elapsed after the detection.Type: GrantFiled: January 30, 2012Date of Patent: July 9, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventor: Yasuyuki Irisawa
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Patent number: 8433499Abstract: An apparatus for detecting imbalance abnormality in an air-fuel ratio between cylinders in a multi-cylinder internal combustion engine comprises a turbocharger, a bypass passage, a waist gate valve, an air-fuel ratio sensor, and a stepless transmission. The imbalance abnormality is detected based upon a variation degree in output of the air-fuel ratio sensor. The internal combustion engine and the stepless transmission are controlled in such a manner that an actual operating point of the internal combustion engine moves on a predetermined operating line in a coordinate system defined by an engine rotational speed and engine torque. The operating line is changed in such a manner that, when the actual operating point is outside of a waist gate valve opening region at the time of detecting the imbalance abnormality, the actual operating point moves into the waist gate valve opening region.Type: GrantFiled: November 1, 2010Date of Patent: April 30, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takayuki Otsuka, Yasuyuki Irisawa