Patents by Inventor Takamitsu Asanuma
Takamitsu Asanuma 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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Publication number: 20120240561Abstract: An exhaust purification system of an internal combustion engine which is controlled so that a combustion air-fuel ratio becomes lean at the time of ordinary operation, provided with an adsorption part which adsorb unburned fuel which is contained in exhaust gas and an oxidation part which has catalyst particles of a metal which oxidizes carbon monoxide. The adsorption part includes zeolite which substantially adsorbs the lower olefins which are contained in the exhaust gas. The adsorption part and the oxidation part are arranged so that the exhaust gas contacts the adsorption part, then contacts the oxidation part.Type: ApplicationFiled: December 1, 2009Publication date: September 27, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuichi Sobue, Daichi Imai, Katsuhiko Oshikawa, Hiroshi Otsuki, Takamitsu Asanuma, Kou Sugawara
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Publication number: 20120222405Abstract: The present detector for detecting sulfur components includes a storage portion for storing SOx and NOx in the exhaust gas passing through an exhaust passage, in which the more an amount of stored SOx increases, the more an amount of stored NOx decreases, and which does not release SOx but release NOx at a set temperature, and a temperature sensor, estimates the amount of stored SOx on the basis of a relationship between, after the storage portion becomes the set temperature by heating, a heating pattern of the storage portion and temperature change of the storage portion measured by the temperature sensor, and detects an integrated amount of SOx passing through the exhaust passage during a given period or an value on the basis of the integrated amount.Type: ApplicationFiled: November 26, 2009Publication date: September 6, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Katsuhiko Oshikawa, Takamitsu Asanuma, Hiromasa Nishioka, Yoshihisa Tsukamoto, Hiroshi Otsuki, Junichi Matsuo, Kazuhiro Umemoto
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Publication number: 20120216516Abstract: An internal combustion engine in which an SOx trap catalyst for trapping SOx contained in the exhaust gas is comprised of an upstream side catalyst and a downstream side catalyst into which the exhaust gas flowing out from the upstream side catalyst flows. The SOx storing material of the upstream side catalyst is mainly comprised of an alkali earth metal, while the SOx storing material of the downstream side catalyst is mainly comprised of an alkali metal.Type: ApplicationFiled: October 6, 2009Publication date: August 30, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiromasa Nishioka, Yoshihisa Tsukamoto, Kazuhiro Umemoto, Junichi Matsuo, Takamitsu Asanuma
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Publication number: 20120180462Abstract: An exhaust purification system of an internal combustion engine has a selective reduction type NOX catalyst device which can hold ammonia and a storage reduction type NOX catalyst device which is arranged at an upstream side of the selective reduction type NOX catalyst device, which makes an air-fuel ratio of exhaust gas which flows into the storage reduction type NOX catalyst device change from a lean air-fuel ratio to a rich air-fuel ratio for starting an ammonia generation period, and which makes an air-fuel ratio of exhaust gas which flows into the storage reduction type NOX catalyst device change from a rich air-fuel ratio to a lean air-fuel ratio for ending the ammonia generation period.Type: ApplicationFiled: October 9, 2009Publication date: July 19, 2012Applicant: Toyota Jidosha Kabushiki KaishaInventors: Takamitsu Asanuma, Hiromasa Nishioka, Yoshihisa Tsukamoto, Junichi Matsuo, Kazuhiro Umemoto
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Patent number: 8209954Abstract: An internal combustion engine wherein an NOx storing catalyst is arranged in an engine exhaust passage and an NOx selective reducing catalyst is arranged downstream of the NOx storing catalyst. Just before the air-fuel ratio of the exhaust gas flowing into the NOx storing catalyst is temporarily switched from lean to rich to release NOx from the NOx storing catalyst, an amount of NOx necessary for removing ammonia adsorbed on the NOx selective reducing catalyst is fed to the NOx selective reducing catalyst under a lean air-fuel ratio.Type: GrantFiled: August 26, 2008Date of Patent: July 3, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kohei Yoshida, Takamitsu Asanuma, Hiromasa Nishioka, Hiroshi Otsuki
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Publication number: 20120110987Abstract: An internal combustion engine in which an SOx trap catalyst (13) for trapping SOx contained in the exhaust gas contains an oxygen adsorbing and releasing material (54) which can adsorb SO2 contained in the exhaust gas and an SOx storage material (55) which can store SOx in the form of sulfates. The SO2 which is contained in the exhaust gas is chemically adsorbed at the oxygen adsorbing and releasing material (54) without being oxidized. If the temperature of the SOx trap catalyst (13) becomes higher than the start temperature of adsorbed SO2 movement, the SO2 which is chemically adsorbed at the oxygen adsorbing and releasing material (54) is oxidized and stored in the form of sulfates in the SOx storage material (55).Type: ApplicationFiled: July 23, 2009Publication date: May 10, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamitsu Asanuma, Yoshihisa Tsukamoto, Kazuhiro Umemoto, Junichi Matsuo, Hiromasa Nishioka
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Patent number: 8161794Abstract: A metal or metal compound able to trap a sulfur component in exhaust gas is arranged in a flow passage of exhaust gas in an internal combustion engine. When the amount of sulfur component trapped in the metal or metal compound increases over the passage of time, a property of the metal or metal compound which changes along with the increase in the amount of trapped sulfur component is measured and the sulfur component in the gas is detected from the measured property.Type: GrantFiled: January 17, 2008Date of Patent: April 24, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiroshi Otsuki, Takamitsu Asanuma, Kohei Yoshida, Hiromasa Nishioka, Shinya Hirota, Kotaro Hayashi
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Patent number: 8156731Abstract: An internal combustion engine in which a front end catalyst (12) and rear end catalyst (14) comprising NOx storing catalysts are arranged in an engine exhaust passage. When these catalysts (12, 14) should recover from SOx poisoning, SOx poisoning recovery proceeding is performed in which the temperatures of the corresponding catalysts (12, 14) are raised to the SOx release temperature and the air-fuel ratio of the exhaust gas flowing into the corresponding catalysts (12, 14) is made rich. In this case, the frequency of performing the SOx poisoning recovery proceeding of the rear end catalyst (14) is made higher than the frequency of performing the SOx poisoning recovery proceeding of the front end catalyst (12).Type: GrantFiled: April 3, 2008Date of Patent: April 17, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kohei Yoshida, Shinya Hirota, Takamitsu Asanuma, Hiromasa Nishioka, Hiroshi Otsuki
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Patent number: 8156787Abstract: A metal compound (50) able to trap a sulfur component in exhaust gas is arranged in a flow path of the exhaust gas, a property of the metal compound (50) changing along with an increase of the amount of sulfur component trapped at the metal compound (50) is measured, and the cumulative value of the amount of SOX actually contained in the exhaust gas is calculated from the measured property. On the other hand, the assumed cumulative value of the amount of SOX, assumed to be contained in the exhaust gas when assuming that fuel or oil of a sulfur concentration assumed in advance is used, is calculated. It is judged if fuel or oil with a high sulfur concentration is being used from the actual cumulative value of the amount of SOX and the assumed cumulative value of the amount of SOX.Type: GrantFiled: June 30, 2008Date of Patent: April 17, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takamitsu Asanuma, Kohei Yoshida, Hiromasa Nishioka, Hiroshi Otsuki, Yuka Nakata
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Publication number: 20120073273Abstract: An exhaust purification system of an internal combustion engine including an ammonia oxidation catalyst device and an ammonia holding device arranged immediately upstream of the ammonia oxidation catalyst device is provided. The ammonia holding device has a solid acid, holds ammonia to restrain the ammonia from flowing into the ammonia oxidation catalyst device when a temperature of the ammonia oxidation catalyst device is within a N2O producing temperature range, and releases the held ammonia to make the ammonia flow into the ammonia oxidation catalyst device when the temperature of the ammonia oxidation catalyst device is out of the N2O producing temperature range.Type: ApplicationFiled: June 16, 2009Publication date: March 29, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamitsu Asanuma, Kazuhiro Umemoto
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Patent number: 8136346Abstract: A post-treatment system comprised of an SOx trapping catalyst (11), a particulate filter (13) carrying an NOx storing and reducing catalyst, and an NOx storing and reducing catalyst (15) and a fuel feed valve (17) for feeding fuel for post processing to the post-treatment system are arranged in an engine exhaust passage. Each time an operating period of the engine passes a certain period, values of operating parameters of the engine and the method of feeding the post-treatment use fuel are reset so that the total amount of consumption of the combustion use fuel and post-treatment use fuel becomes smallest while maintaining the amounts of the harmful components discharged into the atmosphere at below the regulatory values.Type: GrantFiled: December 1, 2006Date of Patent: March 20, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kohei Yoshida, Shinya Hirota, Takamitsu Asanuma
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Patent number: 8132401Abstract: An internal combustion engine wherein an SOx trap catalyst (12), an NOx storage catalyst (14), and a fuel addition valve (15) are arranged in an engine exhaust passage. When making the air-fuel ratio of the exhaust gas flowing into the NOx storage catalyst (14) the stoichiometric air-fuel ratio or rich so as to make the NOx storage catalyst (14) release NOx, additional fuel is supplied into the combustion chamber (2) and fuel is added from the fuel addition valve (15). At this time, the amount of additional fuel to the combustion chamber (2) is controlled so that the air-fuel ratio of the exhaust gas exhausted from the combustion chamber (2) becomes the smallest in the range where the SOx trap catalyst (12) does not release SOx.Type: GrantFiled: April 3, 2008Date of Patent: March 13, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kohei Yoshida, Takamitsu Asanuma, Hiromasa Nishioka
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Publication number: 20120055143Abstract: An exhaust purification system is provided with an NOx storage reduction catalyst arranged in an exhaust passage and an SOx trap material arranged upstream of the NOx storage reduction catalyst and removes SOx contained in exhaust gas. A main flow path has a secondary flow path connected to it. In the secondary flow path, a removal device is arranged for removing the sulfur constituent contained in fuel. The secondary flow path includes an opening and closing device. When the SOx removal rate of the SOx trap material becomes a predetermined removal rate judgment value or less or the concentration of the SOx which flows into the SOx trap material becomes a predetermined concentration judgment value or more, at least part of the fuel flowing through a main flow path is made to flow into the secondary flow path and run through the removal device.Type: ApplicationFiled: May 18, 2009Publication date: March 8, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamitsu Asanuma, Hiromasa Nishioka, Daichi Imai, Yuka Nakata, Kazuhiro Umemoto
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Publication number: 20120047878Abstract: An exhaust purification system of an internal combustion engine includes an NOX storage reduction catalyst device which is arranged in an engine exhaust passage. The NO storage reduction catalyst device stores SOX simultaneously with NOX. When the stored SOX amount exceeds a predetermined allowable amount, the SOX is made to be released by SOX release control which raises the temperature of the NOX catalyst device to the SOX releasable temperature, then makes the air-fuel ratio of the exhaust gas which flows into the NOX catalyst device the stoichiometric air-fuel ratio or rich. The NOX catalyst device has a residual SOX storage amount which finally remains even if performing SOX release control depending on the temperature of the NOX catalyst device when performing SOX release control. The system uses the residual SOX storage amount of the current SOX release control as the basis to calculate the SOX release speed at each timing in the current SOX release control.Type: ApplicationFiled: May 7, 2009Publication date: March 1, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kohei Yoshida, Takamitsu Asanuma, Masahide Iida, Yuichi Sobue
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Patent number: 8122706Abstract: When performing temperature elevation control at a first exhaust purification device, a second exhaust purification device is prevented from being raised in temperature to a set temperature or more.Type: GrantFiled: June 20, 2007Date of Patent: February 28, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kohei Yoshida, Shinya Hirota, Takamitsu Asanuma
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Publication number: 20120042636Abstract: The exhaust purification system of an internal combustion engine is provided with an NOX selective reduction catalyst which is arranged in an engine exhaust passage and which has the function of absorbing NOX which is contained in exhaust gas when an air-fuel ratio of inflowing exhaust gas is lean, releasing the absorbed NOX when the air-fuel ratio of the inflowing exhaust gas becomes a stoichiometric air-fuel ratio or rich, and selectively reducing the NOX and with a fuel addition valve which feeds fuel to the NOX selective reduction catalyst. In the case of the region near the stoichiometric air-fuel ratio in the region where the air-fuel ratio of the exhaust gas flowing into the NOX selective reduction catalyst is lean, the fuel addition valve is used to feed fuel to the NOX selective reduction catalyst to selectively reduce the NOX.Type: ApplicationFiled: March 19, 2009Publication date: February 23, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamitsu Asanuma, Hiromasa Nishioka, Daichi Imai, Yuka Nakata, Kazuhiro Umemoto
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Patent number: 8104271Abstract: An SOX trap catalyst (11) in which at least one of an alkali metal and alkali earth metal is carried diffused is arranged in an exhaust passage of an internal combustion engine. By holding the temperature of the SOX trap catalyst (11) during engine operation at the temperature where a nitrate of the at least one of the alkali metal and alkali earth metal becomes the melted state, a nitrate movement and coagulation action where the nitrate in the SOX trap catalyst (11) moves to and coagulates at the surface of the SOX trap catalyst (11) is promoted. Due to this nitrate movement and coagulation action, SOX is removed while restoring the SOX trap rate.Type: GrantFiled: June 22, 2007Date of Patent: January 31, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kohei Yoshida, Kotaro Hayashi, Shinya Hirota, Takamitsu Asanuma, Hiromasa Nishioka, Hiroshi Otsuki
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Patent number: 8104266Abstract: In an internal combustion engine, an SOx sensor (16) having a sensor part (53, 60) trapping the SOx contained in the exhaust gas and able to detect the amount of SOx trapped at the sensor part (53, 60) from a change of property of the sensor part (53, 60) is arranged in the engine exhaust passage upstream of the NOx storing catalyst (14). When estimating the amount of SOx stored in the NOx storing catalyst (14) from the amount of SOx trapped at the sensor part (53, 60), deviation of the estimated value of the amount of stored SOx arising due to the difference between the SOx trapping rate of the sensor part (53, 60) and the SOx trapping rate of the NOx storing catalyst (14) is corrected.Type: GrantFiled: April 30, 2008Date of Patent: January 31, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiroshi Otsuki, Takamitsu Asanuma, Kohei Yoshida, Hiromasa Nishioka, Shinya Hirota, Kotaro Hayashi
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Publication number: 20120017587Abstract: A control system of an internal combustion engine which arranges in an engine exhaust passage an exhaust turbine of an exhaust driven type supercharger, arranges in the exhaust passage downstream of the exhaust turbine an exhaust purification catalyst connects the exhaust passage between the exhaust purification catalyst and the exhaust turbine with the exhaust passage upstream of the exhaust turbine by a bypass passage, arranges in the bypass passage a storing agent which stores a specific ingredient in the exhaust, and is provided with an exhaust gas flow switching device which selectively switches the exhaust gas flow between a flow which flows through the exhaust turbine into the exhaust purification catalyst and a flow which flows through the bypass passage into the exhaust purification catalyst.Type: ApplicationFiled: April 10, 2009Publication date: January 26, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kohei Yoshida, Takamitsu Asanuma, Akinori Morishima, Mikio Inoue
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Patent number: 8099952Abstract: In an internal combustion engine, an NOx selective reducing catalyst is arranged inside an engine exhaust passage, an oxidation catalyst is arranged upstream of the NOx selective reducing catalyst, and an NOx adsorption catalyst is arranged upstream of the oxidation catalyst. The NOx adsorption catalyst has a property of releasing NOx when the temperature rises and a property of trapping the SOx contained in the exhaust gas. The inflow of SOx into the oxidation catalyst is suppressed by the NOx adsorption catalyst to prevent the NO released from the NOx adsorption catalyst being oxidized to NO2 at the oxidation catalyst from being obstructed by SOx.Type: GrantFiled: August 15, 2008Date of Patent: January 24, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Shinya Hirota, Takamitsu Asanuma, Kohei Yoshida, Hiromasa Nishioka, Hiroshi Otsuki