Patents by Inventor Kojiro Okada
Kojiro Okada 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: 7971428Abstract: An exhaust gas purification device for an internal combustion engine comprises, an exhaust passage including a catalyst for conveying exhaust gas discharged from the engine to the outside, and a bend formed by bending a portion of the exhaust passage directly upstream of the catalyst, the bend causing exhaust gas discharged from the engine to collide against a corner portion between an inlet end face of the catalyst and such portion of a wall of the exhaust passage that follows the outside of the bend, thereby increasing pressure at the corner portion, compared with the other portion of the inlet end face, and an additive injection valve fitted to the outside of the bend of the exhaust passage to inject an additive in such manner that the injected additive passes just above the corner portion and falls on the inlet end face of the catalytic converter.Type: GrantFiled: November 7, 2008Date of Patent: July 5, 2011Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Jidosha Engineering Kabushiki KaishaInventors: Hiroyuki Kimura, Mitsutaka Kojima, Kojiro Okada, Kei Shigahara, Michihiro Hata, Kazuhito Kawashima, Kazuo Koga, Kazuto Maehara, Hajime Ishii
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Patent number: 7874145Abstract: Control is performed such that when an HC adsorption catalytic converter having an oxygen storage capacity is in a specified temperature range, fuel supply quantity is increased with a first increase ratio relative to basic fuel quantity based on the operating state of an internal combustion engine, in a first specified period after the end of fuel cut, and increased with a second increase ratio smaller than the first increase ratio, in a second specified period succeeding the first specified period.Type: GrantFiled: September 4, 2007Date of Patent: January 25, 2011Assignee: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Mitsutaka Kojima, Kojiro Okada, Kazuma Sanada, Yuji Sato, Hiroshi Tanada, Kouichi Tomida, Keisuke Tashiro
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Patent number: 7730721Abstract: The exhaust gas purification device of an internal combustion engine of the present invention comprises an exhaust passage for guiding an exhaust gas exhausted from an engine to outside, a catalyst provided in the exhaust passage, an injection path connected on an upstream side of the catalyst in the exhaust passage, an additive injection valve installed in the injection path for supplying an additive to the catalyst through the injection path, and an inflow portion provided in a merging portion where the exhaust passage and the injection path merge for having a part of the exhaust gas flowing in the exhaust passage flow into the injection path.Type: GrantFiled: November 7, 2008Date of Patent: June 8, 2010Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Jidosha Engineering Kabushiki KaishaInventors: Hiroyuki Kimura, Mitsutaka Kojima, Kojiro Okada, Kei Shigahara, Michihiro Hata, Kazuhito Kawashima, Kazuo Koga, Kazuto Maehara, Hajime Ishii
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Publication number: 20090158717Abstract: The exhaust gas purification device of an internal combustion engine of the present invention comprises an exhaust passage for guiding an exhaust gas exhausted from an engine to outside, a catalyst provided in the exhaust passage, an injection path connected on an upstream side of the catalyst in the exhaust passage, an additive injection valve installed in the injection path for supplying an additive to the catalyst through the injection path, and an inflow portion provided in a merging portion where the exhaust passage and the injection path merge for having a part of the exhaust gas flowing in the exhaust passage flow into the injection path.Type: ApplicationFiled: November 7, 2008Publication date: June 25, 2009Inventors: Hiroyuki KIMURA, Mitsutaka KOJIMA, Kojiro OKADA, Kei SHIGAHARA, Michihiro HATA, Kazuhito KAWASHIMA, Kazuo KOGA, Kazuto MAEHARA, Hajime ISHII
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Publication number: 20090158722Abstract: An emission control system, includes: an exhaust pipe portion, adapted to guide exhaust gas from an engine to outside; a catalyst, accommodated in the exhaust pipe portion; an additive injection valve, provided at the exhaust pipe portion located at upstream side of the catalyst, and configured to inject additives to be supplied to the catalyst toward a flow of the exhaust gas in the exhaust pipe portion. The exhaust pipe portion has a flow path section located at upstream side of the catalyst, which intersects an injection flow of the additives injected by the additive injection valve, and the flow path section is made to have substantially the same shape as an injection region of the injection flow which confronts the exhaust gas.Type: ApplicationFiled: December 23, 2008Publication date: June 25, 2009Inventors: Mitsutaka KOJIMA, Hiroyuki Kimura, Kojiro Okada, Kei Shigahara, Michihiro Hata, Kazuhito Kawashima, Kazuo Koga, Kazuto Maehara, Hajima Ishii
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Publication number: 20090158718Abstract: The present invention provides an exhaust gas purification device for an internal combustion engine, comprising an exhaust passage including a catalyst for conveying exhaust gas discharged from the engine to the outside, and a bend formed by bending a portion of the exhaust passage directly upstream of the catalyst, the bend causing exhaust gas discharged from the engine to collide against a corner portion between an inlet end face of the catalyst and such portion of a wall of the exhaust passage that follows the outside of the bend, thereby increasing pressure at the corner portion, compared with the other portion of the inlet end face, and an additive injection valve fitted to the outside of the bend of the exhaust passage to inject an additive in such manner that the injected additive passes just above the corner portion and falls on the inlet end face of the catalytic converter.Type: ApplicationFiled: November 7, 2008Publication date: June 25, 2009Inventors: Hiroyuki KIMURA, Mitsutaka KOJIMA, Kojiro OKADA, Kei SHIGAHARA, Michihiro HATA, Kazuhito KAWASHIMA, Kazuo KOGA, Kazuto MAEHARA, Hajime ISHII
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Publication number: 20080184697Abstract: Control is performed such that when an HC adsorption catalytic converter having an oxygen storage capacity is in a specified temperature range, fuel supply quantity is increased with a first increase ratio relative to basic fuel quantity based on the operating state of an internal combustion engine, in a first specified period after the end of fuel cut, and increased with a second increase ratio smaller than the first increase ratio, in a second specified period succeeding the first specified period.Type: ApplicationFiled: September 4, 2007Publication date: August 7, 2008Inventors: Mitsutaka Kojima, Kojiro Okada, Kazuma Sanada, Yuji Sato, Hiroshi Tanada, Kouichi Tomida, Keisuke Tashiro
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Publication number: 20060228274Abstract: An exhaust gas purifying apparatus includes a casing provided at an exhaust path of an internal combustion engine, and plural carriers arranged in the casing from an inlet side of an exhaust gas to an outlet side and connected to each other through gap portions. The carrier includes through holes in which the exhaust gas flows and a carrier wall to partition the though holes and to carry a catalyst to purify the exhaust gas. A thickness of a coating layer of a rear catalyst carried by the carrier on the outlet side is set to be larger than a thickness of a coating layer of a front catalyst carried by the carrier on the inlet side. An opening area of the carrier carrying the catalyst on the outlet side is set to be smaller than an opening area of a carrier carrying the catalyst on the inlet side.Type: ApplicationFiled: April 6, 2006Publication date: October 12, 2006Inventor: Kojiro Okada
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Patent number: 6976356Abstract: When a NOx-releasing unit is operated to change an air-fuel ratio to a rich side to thereby establish a low-oxygen-concentration atmosphere of an exhaust gas such that NOx is released from a NOx catalyst, a reducer-supplying unit additionally supplies a reducer during an operating period of the NOx-releasing unit for reducing NOx released into an exhaust path such that release of NOx balances with reduction of NOx, thereby reducing NOx released from the NOx catalyst and thus suppressing worsening of an exhaust gas performance.Type: GrantFiled: February 2, 2004Date of Patent: December 20, 2005Assignee: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Kojiro Okada, Osamu Nakayama, Yasuki Tamura, Kazuhito Kawashima
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Patent number: 6892527Abstract: A catalyst deterioration suppressing apparatus and method stops supply of fuel when an engine is decelerating, and prohibits the supply of fuel from being stopped when the catalyst temperature is equal to or higher than a predetermined temperature when the engine is decelerating. When the supply of fuel is prohibted from being stopped, the air-fuel ratio is prohibited from being feedback-controlled. As a result, it is possible to control the air-fuel ratio in a stable manner while suppressing deterioration of a catalyst.Type: GrantFiled: July 16, 2003Date of Patent: May 17, 2005Assignee: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Katsunori Ueda, Masaaki Kaneko, Kojiro Okada, Ishido Masanori, Yasuki Tamura
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Patent number: 6892528Abstract: A catalyst deterioration detecting apparatus aims at accurately determining whether or not a catalyst deteriorates even if a strict standard for catalyst deterioration is established. The catalyst deterioration detecting apparatus includes catalyst temperature sensing means for obtaining temperature of a catalyst, including ceria (CeO2) serving as an oxygen storage agent, and deterioration detecting means for detecting a degree of deterioration of the catalyst if the temperature is obtained by the catalyst temperature sensing means is equal to or higher than an activation temperature at which the catalyst is activated and is in a particular temperature range causing NOX conversion efficiency of the catalyst to decrease.Type: GrantFiled: September 26, 2003Date of Patent: May 17, 2005Assignee: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Kojiro Okada, Yasuki Tamura, Kinichi Iwachido, Osamu Nakayama
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Publication number: 20040154288Abstract: When a NOx-releasing unit is operated to change an air-fuel ratio to a rich side to thereby establish a low-oxygen-concentration atmosphere of an exhaust gas such that NOx is released from a NOx catalyst, a reducer-supplying unit additionally supplies a reducer during an operating period of the NOx-releasing unit for reducing NOx released into an exhaust path such that release of NOx balances with reduction of NOx, thereby reducing NOx released from the NOx catalyst and thus suppressing worsening of exhaust gas performance.Type: ApplicationFiled: February 2, 2004Publication date: August 12, 2004Applicant: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Kojiro Okada, Osamu Nakayama, Yasuki Tamura, Kazuhito Kawashima
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Publication number: 20040128983Abstract: A catalyst deterioration detecting apparatus aims at accurately determining whether or not a catalyst deteriorates even if a strict standard for catalyst deterioration is established. The catalyst deterioration detecting apparatus includes catalyst temperature sensing means for obtaining temperature of a catalyst, including ceria (CeO2) serving as an oxygen storage agent, and deterioration detecting means for detecting a degree of deterioration of the catalyst if the temperature is obtained by the catalyst temperature sensing means is equal to or higher than an activation temperature at which the catalyst is activated and is in a particular temperature range causing NOX conversion efficiency of the catalyst to decrease.Type: ApplicationFiled: September 26, 2003Publication date: July 8, 2004Inventors: Kojiro Okada, Yasuki Tamura, Kinichi Iwachido, Osamu Nakayama
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Patent number: 6718756Abstract: When a NOx-releasing unit is operated to change an air-fuel ratio to a rich side to thereby establish a low-oxygen-concentration atmosphere of an exhaust gas such that NOx is released from a NOx catalyst, a reducer-supplying unit 33 additionally supplies a reducer during an operating period of the NOx-releasing unit for reducing NOx released into an exhaust path such that release of NOx balances with reduction of NOx, thereby reducing NOx released from the NOx catalyst and thus suppressing worsening of exhaust gas performance.Type: GrantFiled: September 21, 2000Date of Patent: April 13, 2004Assignee: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Kojiro Okada, Osamu Nakayama, Yasuki Tamura, Kazuhito Kawashima
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Patent number: 6711892Abstract: An exhaust passage (20) of an internal-combustion engine (1) is provided with an exhaust emission control unit (40) capable of reducing harmful substances in exhaust gas under a given exhaust pressure condition and an exhaust sensor (22) for detecting the concentration of a specific exhaust component (H2, O2) in the exhaust gas, and a performance lowering identifying unit identifies lowering of the performance of the exhaust emission control (40) by detecting a failure to fulfill the given exhaust pressure condition in accordance with the output of the exhaust sensor.Type: GrantFiled: November 18, 2002Date of Patent: March 30, 2004Assignee: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Yasuki Tamura, Kojiro Okada, Tomohiro Ohashi, Naoto Yamada, Kazuo Koga
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Publication number: 20040050036Abstract: A catalyst deterioration suppressing apparatus and method stops supply of fuel when an engine is decelerating, and prohibits the supply of fuel from being stopped when the catalyst temperature is equal to or higher than a predetermined temperature when the engine is decelerating. When the supply of fuel is prohibited from being stopped, the air-fuel ratio is prohibited from being feedback-controlled. As a result, it is possible to control the air-fuel ratio in a stable manner while suppressing deterioration of a catalyst.Type: ApplicationFiled: July 16, 2003Publication date: March 18, 2004Inventors: Katsunori Ueda, Masaaki Kaneko, Kojiro Okada, Ishido Masanori, Yasuki Tamura
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Patent number: 6644021Abstract: In an exhaust gas purifying apparatus of an internal combustion engine, the temperature of occlusion-type NOx catalyst is increased to emit SOx when the temperature of occlusion-type NOx catalyst is not less than a set temperature. This prevents the deterioration of fuel consumption and enables the regeneration of a catalyst device by efficiently desorbing a sulfur component from the catalyst device. In this case, the temperature of the occlusion-type NOx catalyst is preferably set according to the frequency of the SOx desorption, and the temperature of the occlusion-type NOx catalyst can be increased by, for example, retarding an ignition timing.Type: GrantFiled: November 25, 2002Date of Patent: November 11, 2003Assignee: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Kojiro Okada, Yasuki Tamura
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Publication number: 20030115854Abstract: An exhaust passage (20) of an internal-combustion engine (1) is provided with exhaust emission control means (40) capable of reducing harmful substances in exhaust gas under a given exhaust pressure condition and an exhaust sensor (22) for detecting the concentration of a specific exhaust component (H2, O2) in the exhaust gas, and performance lowering identifying means identifies lowering of the performance of the exhaust emission control means (40) by detecting a failure to fulfill the given exhaust pressure condition in accordance with the output of the exhaust sensor.Type: ApplicationFiled: November 18, 2002Publication date: June 26, 2003Inventors: Yasuki Tamura, Kojiro Okada, Tomohiro Ohashi, Naoto Yamada, Kazuo Koga
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Publication number: 20030106307Abstract: In an exhaust gas purifying apparatus of an internal combustion engine, the temperature of occlusion-type NOx catalyst is increased to emit SOx when the temperature of occlusion-type NOx catalyst is not less than a set temperature. This prevents the deterioration of fuel consumption and enables the regeneration of a catalyst device by a efficiently desorbing a sulfur component from the catalyst device. In this case, the temperature of the occlusion-type NOx catalyst is preferably set according to the frequency of the SOx desorption, and the temperature of the occlusion-type NOx catalyst can be increased by, for example, retarding an ignition timing.Type: ApplicationFiled: November 25, 2002Publication date: June 12, 2003Applicant: Mitsubishi Jidosha Kogyo Kabushiki KaishaInventors: Kojiro Okada, Yasuki Tamura
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Patent number: 6558636Abstract: The present plasma type exhaust gas cleaning apparatus comprises a dielectric (5) arranged between a discharge electrode (7) and a ground electrode (8). The dielectric has a plurality of independent cavities (6) formed therein. The exhaust gas from combustion equipment (1) flows through the interiors of the plurality of independent cavities (6). Thus, in the plasma type exhaust gas cleaning apparatus, the discharge electrode (7) and the ground electrode (8) are securely partitioned by the cavities (6). When a voltage from a high voltage generator (9) is applied to between the discharge electrode (7) and the ground electrode (8), plasma resulting from corona discharges occurs in each individual cavity (6) without arising directly across the discharge electrode (7) and the ground electrode (8). The exhaust gas is thereby cleaned up.Type: GrantFiled: January 25, 2001Date of Patent: May 6, 2003Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Heavy Industries, Ltd.Inventors: Yasuki Tamura, Kojiro Okada, Kazuo Koga, Osamu Nakayama, Keisuke Kawamura, Kiyoshi Kawamura