Patents by Inventor Hisashi Akagawa
Hisashi Akagawa 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: 8578703Abstract: In an exhaust emission purifying apparatus for an internal combustion engine, for adding a reducing agent for NOx to the exhaust gas to thereby purify NOx in the exhaust gas, the mixing of the reducing agent injected by an injection nozzle with the exhaust gas is accelerated. To this end, in the apparatus of the present invention, the injection nozzle for the urea water is disposed to be opposite to the flow of the exhaust gas, or to face upward in a vertical direction.Type: GrantFiled: November 24, 2010Date of Patent: November 12, 2013Assignee: Nissan Diesel Motor Co., Ltd.Inventors: Kiminobu Hirata, Nobuhiko Masaki, Hisashi Akagawa, Yuji Yajima
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Patent number: 8209958Abstract: An engine exhaust emission purification apparatus for reducing and purifying NOx in the exhaust emission by using a liquid reducing agent having a temperature maintenance device for maintaining a temperature of at least a part of a liquid reducing agent supply system configured by an injection nozzle and piping of the injection nozzle at a temperature lower than a boiling point of a solvent of the liquid reducing agent or equal to or higher than a melting point of dissolved matter in which the liquid reducing agent existing in the liquid reducing agent supply system conducts heat exchange with the liquid reducing agent supply system thereby being maintained at a temperature lower than the boiling point of the solvent or equal to or higher than the melting point of the dissolved matter and resultantly, occurrence of precipitation of the dissolved matter due to evaporation of only the solvent in the liquid reducing agent supply system does not occur, and even if precipitation of the dissolved matter occurs, theType: GrantFiled: February 18, 2009Date of Patent: July 3, 2012Assignee: Nissan Diesel Motor Co., Ltd.Inventors: Kiminobu Hirata, Hisashi Akagawa, Shuichi Nakamura, Hiroki Ueno, Ikuo Sakai
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Patent number: 8011176Abstract: In an exhaust emission purifying apparatus for an internal combustion engine, for adding a reducing agent for NOx to the exhaust gas to thereby purify NOx in the exhaust gas, the mixing of the reducing agent injected by an injection nozzle with the exhaust gas is accelerated. To this end, in the apparatus of the present invention, the injection nozzle for the urea water is disposed to be opposite to the flow of the exhaust gas, or to face upward in a vertical direction.Type: GrantFiled: July 31, 2006Date of Patent: September 6, 2011Assignee: Nissan Diesel Motor Co., Ltd.Inventors: Kiminobu Hirata, Nobuhiko Masaki, Hisashi Akagawa, Yuji Yajima
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Publication number: 20110067385Abstract: In an exhaust emission purifying apparatus for an internal combustion engine, for adding a reducing agent for NOx to the exhaust gas to thereby purify NOx in the exhaust gas, the mixing of the reducing agent injected by an injection nozzle with the exhaust gas is accelerated. To this end, in the apparatus of the present invention, the injection nozzle for the urea water is disposed to be opposite to the flow of the exhaust gas, or to face upward in a vertical direction.Type: ApplicationFiled: November 24, 2010Publication date: March 24, 2011Applicant: NISSAN DIESEL MOTOR CO., LTD.Inventors: Kiminobu HIRATA, Nobuhiko Masaki, Hisashi Akagawa, Yuji Yajima
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Publication number: 20110067384Abstract: In an exhaust emission purifying apparatus for an internal combustion engine, for adding a reducing agent for NOx to the exhaust gas to thereby purify NOx in the exhaust gas, the mixing of the reducing agent injected by an injection nozzle with the exhaust gas is accelerated. To this end, in the apparatus of the present invention, the injection nozzle for the urea water is disposed to be opposite to the flow of the exhaust gas, or to face upward in a vertical direction.Type: ApplicationFiled: November 24, 2010Publication date: March 24, 2011Applicant: NISSAN DIESEL MOTOR CO., LTD.Inventors: Kiminobu HIRATA, Nobuhiko Masaki, Hisashi Akagawa, Yuji Yajima
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Patent number: 7849674Abstract: A NOx reduction catalyst and an ammonia slip oxidation catalyst are disposed in an exhaust system in this order, and also, an electric fan is disposed on piping which communicates an upper space of a storage tank storing therein a reducing agent with the exhaust upstream of the NOx reduction catalyst. Then, when the temperature of the ammonia slip oxidation catalyst reaches or exceeds the temperature for activating a catalyst thereof, the electric fan is operated for a predetermined period of time, so that the gas (ammonia series gas) in the upper space of the storage tank is forcibly discharged to the upstream side of the NOx reduction catalyst. Further, a discharge-forcing device, such as an electric fan or the like, forcibly discharging the gas in the upper space of the storage tank, an adsorbing device temporarily adsorbing thereto the forcibly discharged gas and an oxidation catalyst oxidizing the gas desorbed from the adsorbing device, may be disposed to the storage tank in this order.Type: GrantFiled: September 2, 2004Date of Patent: December 14, 2010Assignee: Nissan Diesel Motor Co., Ltd.Inventors: Kouji Masuda, Kiminobu Hirata, Hisashi Akagawa, Shuichi Nakamura, Hiroki Ueno, Ikuo Sakai
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Publication number: 20090293460Abstract: An engine exhaust emission purification apparatus for reducing and purifying NOx in the exhaust emission by using a liquid reducing agent having a temperature maintenance device for maintaining a temperature of at least a part of a liquid reducing agent supply system configured by an injection nozzle and piping of the injection nozzle at a temperature lower than a boiling point of a solvent of the liquid reducing agent or equal to or higher than a melting point of dissolved matter in which the liquid reducing agent existing in the liquid reducing agent supply system conducts heat exchange with the liquid reducing agent supply system thereby being maintained at a temperature lower than the boiling point of the solvent or equal to or higher than the melting point of the dissolved matter and resultantly, occurrence of precipitation of the dissolved matter due to evaporation of only the solvent in the liquid reducing agent supply system does not occur, and even if precipitation of the dissolved matter occurs, theType: ApplicationFiled: August 7, 2009Publication date: December 3, 2009Applicant: NISSAN DIESEL MOTOR CO., LTD.Inventors: Kiminobu HIRATA, Hisashi Akagawa, Shuichi Nakamura, Hiroki Ueno, Ikuo Sakai
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Patent number: 7614218Abstract: A particulate filter 8 is disposed in an exhaust passage 7 of an internal combustion engine 1, and a reduction catalyst 9 is disposed downstream of the particulate filter 8. A bypass passage 12 for bypassing the reduction catalyst 9 and a flow path switching valve 13 which switches a flow path for the exhaust gas which has passed through the particulate filter 8 between the exhaust passage 7 and the bypass passage 12 are disposed. A control unit 301 controls the flow path switching valve 13 in association with a temperature Texh of the exhaust gas which has passed through the particulate filter 8.Type: GrantFiled: August 30, 2006Date of Patent: November 10, 2009Assignee: Nissan Diesel Motor Co., Ltd.Inventor: Hisashi Akagawa
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Patent number: 7614213Abstract: An engine exhaust emission purification apparatus for reducing and purifying NOx in the exhaust emission by using a liquid reducing agent having a temperature maintenance device for maintaining a temperature of at least a part of a liquid reducing agent supply system configured by an injection nozzle and piping of the injection nozzle at a temperature lower than a boiling point of a solvent of the liquid reducing agent or equal to or higher than a melting point of dissolved matter in which the liquid reducing agent existing in the liquid reducing agent supply system conducts heat exchange with the liquid reducing agent supply system thereby being maintained at a temperature lower than the boiling point of the solvent or equal to or higher than the melting point of the dissolved matter and resultantly, occurrence of precipitation of the dissolved matter due to evaporation of only the solvent in the liquid reducing agent supply system does not occur, and even If precipitation of the dissolved matter occurs, theType: GrantFiled: September 17, 2004Date of Patent: November 10, 2009Assignee: Nissan Diesel Motor Co., Ltd.Inventors: Kiminobu Hirata, Hisashi Akagawa, Shuichi Nakamura, Hiroki Ueno, Ikuo Sakai
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Publication number: 20090151335Abstract: An engine exhaust emission purification apparatus for reducing and purifying NOx in the exhaust emission by using a liquid reducing agent having a temperature maintenance device for maintaining a temperature of at least a part of a liquid reducing agent supply system configured by an injection nozzle and piping of the injection nozzle at a temperature lower than a boiling point of a solvent of the liquid reducing agent or equal to or higher than a melting point of dissolved matter in which the liquid reducing agent existing in the liquid reducing agent supply system conducts heat exchange with the liquid reducing agent supply system thereby being maintained at a temperature lower than the boiling point of the solvent or equal to or higher than the melting point of the dissolved matter and resultantly, occurrence of precipitation of the dissolved matter due to evaporation of only the solvent in the liquid reducing agent supply system does not occur, and even if precipitation of the dissolved matter occurs, theType: ApplicationFiled: February 18, 2009Publication date: June 18, 2009Applicant: NISSAN DIESEL MOTOR CO., LTD.Inventors: Kiminobu Hirata, Hisashi Akagawa, Shuichi Nakamura, Hiroki Ueno, Ikuo Sakai
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Publication number: 20070180816Abstract: A NOx reduction catalyst and an ammonia slip oxidation catalyst are disposed in an exhaust system in this order, and also, an electric fan is disposed on piping which communicates an upper space of a storage tank storing therein a reducing agent with the exhaust upstream of the NOx reduction catalyst. Then, when the temperature of the ammonia slip oxidation catalyst reaches or exceeds the temperature for activating a catalyst thereof, the electric fan is operated for a predetermined period of time, so that the gas (ammonia series gas) in the upper space of the storage tank is forcibly discharged to the upstream side of the NOx reduction catalyst. Further, a discharge-forcing device, such as an electric fan or the like, forcibly discharging the gas in the upper space of the storage tank, an adsorbing device temporarily adsorbing thereto the forcibly discharged gas and an oxidation catalyst oxidizing the gas desorbed from the adsorbing device, may be disposed to the storage tank in this order.Type: ApplicationFiled: September 2, 2004Publication date: August 9, 2007Inventors: Kouji Masuda, Kiminohu Hirata, Hisashi Akagawa, Shuichi Nakamura, Hiroki Ueno, Ikuo Sakai
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Publication number: 20070092413Abstract: An engine exhaust emission purification apparatus for reducing and purifying NOx in the exhaust emission by using a liquid reducing agent having a temperature maintenance device for maintaining a temperature of at least a part of a liquid reducing agent supply system configured by an injection nozzle and piping of the injection nozzle at a temperature lower than a boiling point of a solvent of the liquid reducing agent or equal to or higher than a melting point of dissolved matter in which the liquid reducing agent existing in the liquid reducing agent supply system conducts heat exchange with the liquid reducing agent supply system thereby being maintained at a temperature lower than the boiling point of the solvent or equal to or higher than the melting point of the dissolved matter and resultantly, occurrence of precipitation of the dissolved matter due to evaporation of only the solvent in the liquid reducing agent supply system does not occur, and even If precipitation of the dissolved matter occurs, theType: ApplicationFiled: September 17, 2004Publication date: April 26, 2007Inventors: Kiminobu Hirata, Hisashi Akagawa, Shuichi Nakamura, Hiroki Ueno, Ikuo Sakai
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Publication number: 20070035832Abstract: In an exhaust emission purifying apparatus for an internal combustion engine, for adding a reducing agent for NOx to the exhaust gas to thereby purify NOx in the exhaust gas, the mixing of the reducing agent injected by an injection nozzle with the exhaust gas is accelerated. To this end, in the apparatus of the present invention, the injection nozzle for the urea water is disposed to be opposite to the flow of the exhaust gas, or to face upward in a vertical direction.Type: ApplicationFiled: July 31, 2006Publication date: February 15, 2007Inventors: Kiminobu Hirata, Nobuhiko Masaki, Hisashi Akagawa, Yuji Yajima
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Publication number: 20060283178Abstract: A particulate filter 8 is disposed in an exhaust passage 7 of an internal combustion engine 1, and a reduction catalyst 9 is disposed downstream of the particulate filter 8. A bypass passage 12 for bypassing the reduction catalyst 9 and a flow path switching valve 13 which switches a flow path for the exhaust gas which has passed through the particulate filter 8 between the exhaust passage 7 and the bypass passage 12 are disposed. A control unit 301 controls the flow path switching valve 13 in association with a temperature Texh of the exhaust gas which has passed through the particulate filter 8.Type: ApplicationFiled: August 30, 2006Publication date: December 21, 2006Inventor: Hisashi Akagawa
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Publication number: 20060248880Abstract: An exhaust gas purification apparatus of an engine having a reduction catalytic converter arranged in an engine exhaust gas system, for reducing and purifying nitrogen oxide by a liquid reducing agent, a reducing agent supply device controlling a flow rate of a liquid reducing agent that is supplied to the reduction catalytic converter, depending on engine operating conditions, an injection nozzle secured to the exhaust system via a flange, for injection-supplying the liquid reducing agent into exhaust gas at a position upstream of the reduction catalytic converter, and piping providing a fluid communication between the reducing agent supply device and the injection nozzle. The piping is constructed of a material made of ceramics, or water repellency treatment is applied to the inner wall of at least one of the injection nozzle and the piping.Type: ApplicationFiled: March 30, 2006Publication date: November 9, 2006Inventors: Kiminobu Hirata, Hisashi Akagawa, Shuichi Nakamura, Hiroki Ueno, Ikuo Sakai