Patents by Inventor Yuriko Hagimoto
Yuriko Hagimoto 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: 10487712Abstract: An exhaust gas control system includes a NSR catalyst, a fuel supply valve, a SCR catalyst an addition device, and an electronic control unit. When temperature of NSR catalyst is in a range of a predetermined first temperature range and temperature of SCR catalyst is in a range of a predetermined second temperature range, the electronic control unit is configured to add additive with the addition device, and execute predetermined air-fuel ratio processing to control the air-fuel ratio of exhaust gas flowing into the NSR catalyst. In the predetermined air-fuel ratio processing, the electronic control unit is configured to execute a second air-fuel ratio processing after a first air-fuel ratio processing, and execute the third air-fuel ratio processing after a first air-fuel ratio processing and the second air-fuel ratio processing and in succession to the second air-fuel ratio processing.Type: GrantFiled: September 21, 2017Date of Patent: November 26, 2019Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yuriko Hagimoto, Yuji Miyoshi, Hiromasa Nishioka
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Patent number: 10465579Abstract: When the temperature of an NSR catalyst belongs to a specified NSR temperature range and the temperature of an SCR catalyst belongs to a specified SCR temperature range, urea water is added, and specified air-fuel ratio processing relating to an air-fuel ratio of exhaust gas flowing into the NSR catalyst is executed. The specified air-fuel ratio processing includes i) a first air-fuel ratio processing to cause the air-fuel ratio of the exhaust gas flowing into the NSR catalyst to be a first lean air-fuel ratio that causes emission of occluded NOx from the NSR catalyst and ii) a second air-fuel ratio processing to cause the air-fuel ratio of the exhaust gas to be a second lean air-fuel ratio leaner than the first lean air-fuel ratio. In the specified air-fuel ratio processing, the first air-fuel ratio processing and the second air-fuel ratio processing are alternately repeated.Type: GrantFiled: September 20, 2017Date of Patent: November 5, 2019Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yuriko Hagimoto, Yuji Miyoshi, Hiromasa Nishioka
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Patent number: 10260393Abstract: An object is to prevent abrasion inside an addition valve and clogging of the addition valve due to an increase in the particle diameter of precipitates. A first control is performed by which a pump is caused to operate in such a way as to return urea solution contained in the addition valve and a urea solution channel to a tank by a predetermined quantity. After the lapse of a certain time after the end of the first control, a second control is performed by which the pump is caused to operate in such a way as to return the urea solution remaining in the addition valve and the urea solution channel thoroughly to the tank.Type: GrantFiled: February 15, 2017Date of Patent: April 16, 2019Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yoshihisa Tsukamoto, Hirotaka Saitoh, Yuriko Hagimoto, Junichi Matsuo, Yasumasa Notake
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Publication number: 20190010847Abstract: An exhaust gas control system includes a NSR catalyst, a fuel supply valve, a SCR catalyst an addition device, and an electronic control unit. When temperature of NSR catalyst is in a rage of a predetermined first temperature range and temperature of SCR catalyst is in a rage of a predetermined second temperature range, the electronic control unit is configured to add additive with the addition device, and execute predetermined air-fuel ratio processing to control the air-fuel ratio of exhaust gas flowing into the NSR catalyst. In the predetermined air-fuel ratio processing, the electronic control unit is configured to execute a second air-fuel ratio processing after a first air-fuel ratio processing, and execute the third air-fuel ratio processing after a first air-fuel ratio processing and the second air-fuel ratio processing and in succession to the second air-fuel ratio processing.Type: ApplicationFiled: September 21, 2017Publication date: January 10, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuriko HAGIMOTO, Yuji MIYOSHI, Hiromasa NISHIOKA
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Patent number: 9995197Abstract: Embodiments of the present disclosure may estimate the amount of ammonia adsorbed in an SCR catalyst as accurately as possible. The ammonia adsorption amount is calculated by integrating the quantity of ammonia supplied to the SCR filter, the quantity of ammonia consumed in reduction of NOx in the SCR catalyst, and the quantity of ammonia desorbed from the SCR catalyst. In the calculation, a differential pressure change rate defined as the increase in a converted differential pressure value per unit increase in the filter PM deposition amount is referred to. The ammonia desorption quantity is calculated in such a way that the calculated value of the ammonia desorption quantity is made smaller when the differential pressure change rate is smaller than a predetermined threshold than when the differential pressure change rate is equal to or higher than the predetermined threshold.Type: GrantFiled: November 22, 2016Date of Patent: June 12, 2018Assignee: Toyota Jidosha Kabushiki KaishaInventors: Toru Kidokoro, Makoto Ogiso, Yuriko Hagimoto, Takeru Shirasawa, Ryohei Ohno, Kenji Furui
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Publication number: 20180094558Abstract: When the temperature of an NSR catalyst belongs to a specified NSR temperature range and the temperature of an SCR catalyst belongs to a specified SCR temperature range, urea water is added, and specified air-fuel ratio processing relating to an air-fuel ratio of exhaust gas flowing into the NSR catalyst is executed. The specified air-fuel ratio processing includes i) a first air-fuel ratio processing to cause the air-fuel ratio of the exhaust gas flowing into the NSR catalyst to be a first lean air-fuel ratio that causes emission of occluded NOx from the NSR catalyst and ii) a second air-fuel ratio processing to cause the air-fuel ratio of the exhaust gas to be a second lean air-fuel ratio leaner than the first lean air-fuel ratio. In the specified air-fuel ratio processing, the first air-fuel ratio processing and the second air-fuel ratio processing are alternately repeated.Type: ApplicationFiled: September 20, 2017Publication date: April 5, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuriko HAGIMOTO, Yuji MIYOSHI, Hiromasa NISHIOKA
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Patent number: 9879586Abstract: An object of the present invention is to distinguish and detect an abnormality of SCRF and an abnormality of a diffusing device in a system in which a diffusing device is provided for an exhaust gas passage between a filter (SCRF) including an SCR catalyst carried thereon and a reducing agent addition valve.Type: GrantFiled: December 7, 2012Date of Patent: January 30, 2018Assignee: Toyota Jidosha Kabushiki KaishaInventor: Yuriko Hagimoto
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Patent number: 9835069Abstract: An object of the disclosure is to adjust the ammonia adsorption amount in an SCR catalyst supported on an SCR filter as close as possible to a target adsorption amount in an exhaust gas purification system including the SCR filter. In a system according to the disclosure, the quantity of ammonia supplied by an ammonia supplier is made smaller when a differential pressure change rate at the time when ammonia is supplied by the ammonia supplier is lower than a predetermined threshold than when the differential pressure change rate at the time when ammonia is supplied by the ammonia supplier is equal to or higher than the predetermined threshold. Moreover, when the differential pressure change rate is lower than the predetermined threshold, the change in the quantity of ammonia supplied by the ammonia supplier relative to the change in the filter PM deposition amount is kept equal to zero.Type: GrantFiled: December 13, 2016Date of Patent: December 5, 2017Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yuriko Hagimoto, Takeru Shirasawa, Ryohei Ono, Kenji Furui
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Publication number: 20170234187Abstract: An object is to prevent abrasion inside an addition valve and clogging of the addition valve due to an increase in the particle diameter of precipitates. A first control is performed by which a pump is caused to operate in such a way as to return urea solution contained in the addition valve and a urea solution channel to a tank by a predetermined quantity. After the lapse of a certain time after the end of the first control, a second control is performed by which the pump is caused to operate in such a way as to return the urea solution remaining in the addition valve and the urea solution channel thoroughly to the tank.Type: ApplicationFiled: February 15, 2017Publication date: August 17, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshihisa TSUKAMOTO, Hirotaka SAITOH, Yuriko HAGIMOTO, Junichi MATSUO, Yasumasa NOTAKE
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Publication number: 20170234186Abstract: An exhaust gas control apparatus for an internal combustion engine includes an addition valve, a tank, a urea water passage, a pump, a nitrogen oxides catalyst, and an electronic control unit. The electronic control unit is configured to: control the pump, as a first control, such that a specified amount of the urea water stored in the addition valve and the urea water passage is returned to the tank after the internal combustion engine is stopped; control the pump, as a second control, such that the specified amount or more of the urea water in the tank is discharged from the tank to the urea water passage after the first control is executed; and control the pump, as a third control, such that all the urea water stored in the addition valve and the urea water passage is returned to the tank after the second control is executed.Type: ApplicationFiled: February 14, 2017Publication date: August 17, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hirotaka SAITOH, Yoshihisa TSUKAMOTO, Yuriko HAGIMOTO, Junichi MATSUO, Yasumasa NOTAKE
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Publication number: 20170175605Abstract: An object of the disclosure is to adjust the ammonia adsorption amount in an SCR catalyst supported on an SCR filter as close as possible to a target adsorption amount in an exhaust gas purification system including the SCR filter. In a system according to the disclosure, the quantity of ammonia supplied by an ammonia supplier is made smaller when a differential pressure change rate at the time when ammonia is supplied by the ammonia supplier is lower than a predetermined threshold than when the differential pressure change rate at the time when ammonia is supplied by the ammonia supplier is equal to or higher than the predetermined threshold. Moreover, when the differential pressure change rate is lower than the predetermined threshold, the change in the quantity of ammonia supplied by the ammonia supplier relative to the change in the filter PM deposition amount is kept equal to zero.Type: ApplicationFiled: December 13, 2016Publication date: June 22, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuriko HAGIMOTO, Takeru SHIRASAWA, Ryohei Ono, Kenji FURUI
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Publication number: 20170145893Abstract: Embodiments of the present disclosure may estimate the amount of ammonia adsorbed in an SCR catalyst as accurate as possible. The ammonia adsorption amount is calculated by integrating the quantity of ammonia supplied to the SCR filter, the quantity of ammonia consumed in reduction of NOx in the SCR catalyst, and the quantity of ammonia desorbed from the SCR catalyst. In the calculation, a differential pressure change rate defined as the increase in a converted differential pressure value per unit increase in the filter PM deposition amount is referred to. The ammonia desorption quantity is calculated in such a way that the calculated value of the ammonia desorption quantity is made smaller when the differential pressure change rate is smaller than a predetermined threshold than when the differential pressure change rate is equal to or higher than the predetermined threshold.Type: ApplicationFiled: November 22, 2016Publication date: May 25, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toru KIDOKORO, Makoto OGISO, Yuriko HAGIMOTO, Takeru SHIRASAWA, Ryohei OHNO, Kenji FURUI
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Patent number: 9188046Abstract: The abnormality of an NH3 sensor is judged highly accurately.Type: GrantFiled: April 26, 2012Date of Patent: November 17, 2015Assignee: Toyota Jidosha Kabushiki KaishaInventor: Yuriko Hagimoto
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Publication number: 20150315950Abstract: An object of the present invention is to distinguish and detect an abnormality of SCRF and an abnormality of a diffusing device in a system in which a diffusing device is provided for an exhaust gas passage between a filter (SCRF) including an SCR catalyst carried thereon and a reducing agent addition valve.Type: ApplicationFiled: December 7, 2012Publication date: November 5, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yuriko HAGIMOTO
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Publication number: 20150093292Abstract: The abnormality of an NH3 sensor is judged highly accurately.Type: ApplicationFiled: April 26, 2012Publication date: April 2, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yuriko Hagimoto