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公开(公告)号：US09835069B2
公开(公告)日：2017-12-05
申请号：US15377328
申请日：2016-12-13
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Yuriko Hagimoto , Takeru Shirasawa , Ryohei Ono , Kenji Furui
CPC classification number: F01N3/208 , B01D46/0027 , B01D53/9418 , B01D53/9431 , B01D53/9495 , B01D2279/30 , F01N3/035 , F01N3/2066 , F01N11/002 , F01N2240/25 , F01N2510/06 , F01N2560/025 , F01N2560/026 , F01N2560/06 , F01N2560/08 , F01N2560/14 , F01N2610/02 , F01N2900/1406 , F01N2900/1622
Abstract: 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.
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公开(公告)号：US11492952B2
公开(公告)日：2022-11-08
申请号：US17116058
申请日：2020-12-09
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Kenji Furui , Go Hayashita , Yoichi Kadota
Abstract: A catalyst degradation detection apparatus includes an air-fuel ratio detector disposed downstream of a catalyst and configured to detect an air-fuel ratio of exhaust gas flowing out from the catalyst, and an electronic control unit configured to control an air-fuel ratio of inflow exhaust gas flowing into the catalyst and determine whether the catalyst is degraded. The electronic control unit is configured to execute degradation determination control that brings the air-fuel ratio of the inflow exhaust gas to an air-fuel ratio leaner or richer than a stoichiometric air-fuel ratio. The electronic control unit is configured to determine whether precious metal of the catalyst is degraded based on the air-fuel ratio detected by the air-fuel ratio detector when an oxygen storage amount of the catalyst is varying in the degradation determination control.
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公开(公告)号：US09759117B2
公开(公告)日：2017-09-12
申请号：US14976335
申请日：2015-12-21
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Arifumi Matsumoto , Toru Kidokoro , Taiga Hagimoto , Makoto Ogiso , Kenji Furui
CPC classification number: F01N11/002 , F01N3/035 , F01N3/0814 , F01N3/0821 , F01N3/2066 , F01N3/208 , F01N9/00 , F01N11/00 , F01N2250/02 , F01N2550/04 , F01N2560/08 , F01N2900/0418 , F01N2900/0422 , F01N2900/1402 , F01N2900/1602 , F01N2900/1606 , Y02T10/24 , Y02T10/47
Abstract: A diagnostic system for an internal combustion engine is disclosed. The diagnostic system may include an electronic control unit. The electronic control unit may determine whether a predetermined condition is satisfied. The predetermined condition may be a condition under which an amount of particulate matter that separates from a filter is larger than or equal to a predetermined separation amount as a urea water-originated deposit once accumulated in the filter separates in gaseous form. When the electronic control unit determines that the predetermined condition is satisfied, the electronic control unit may not execute a diagnosis of a malfunction in the filter based on a filter differential pressure until a predetermined period elapses from the point in time at which it is determined that the predetermined condition is satisfied.
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14.发明申请公开(公告)号：US20160109420A1
公开(公告)日：2016-04-21
申请号：US14882807
申请日：2015-10-14
Applicant: Toyota Jidosha Kabushiki Kaisha
Inventor： Kenji Furui , Toru Kidokoro , Taiga Hagimoto , Arifumi Matsumoto , Akifumi Uozumi
IPC: G01N33/00
CPC classification number: G01N33/0037 , F01N3/2066 , F01N11/00 , F01N13/0093 , F01N2550/05 , F01N2560/026 , F01N2610/02 , F01N2900/1621 , F01N2900/1814 , F01N2900/1818 , F01N2900/1821 , G01N33/0073 , Y02T10/24 , Y02T10/47
Abstract: When individually controlling a plurality of supply valves is not available, an object of the invention is to determine which of the plurality of supply valves is abnormal with high accuracy, while suppressing a cost increase. A first supply valve, a first selective reduction NOx catalyst, a second supply valve, a second selective reduction NOx catalyst and a NOx sensor are sequentially provided in an exhaust conduit. With a view to identifying which of abnormality of the first supply valve and abnormality of the second supply valve, an instruction is given to the first supply valve and the second supply valve to increase a supply amount of a reducing agent. This identification is based on a NOx concentration detected by the NOx sensor after elapse of a first specified time duration since an instruction time point that is a time point when this instruction is given.
Abstract translation: 当单独控制多个供给阀不可用时，本发明的目的是在抑制成本增加的同时，以高精度确定多个供给阀中的哪一个异常。 第一供给阀，第一选择还原NOx催化剂，第二供给阀，第二选择还原NOx催化剂和NOx传感器依次设置在排气导管中。 为了识别第一供给阀的异常和第二供给阀的异常，向第一供给阀和第二供给阀指示增加还原剂的供给量。 该识别基于从作为该指示的时间点的指示时间点开始经过第一指定持续时间之后由NOx传感器检测到的NOx浓度。
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公开(公告)号：US11434806B2
公开(公告)日：2022-09-06
申请号：US17095913
申请日：2020-11-12
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Kenji Furui , Go Hayashita , Yoichi Kadota
Abstract: The catalyst deterioration detection system 1 comprises an air-fuel ratio detection device 41 detecting an air-fuel ratio of an exhaust gas flowing out from the catalyst 20, an air-fuel ratio control part 71, and a deterioration judgment part 72. The air-fuel ratio control part is configured to perform a lean control making the air-fuel ratio of the inflowing exhaust gas leaner than a stoichiometric air-fuel ratio and a rich control making the air-fuel ratio of the inflowing exhaust gas richer than the stoichiometric air-fuel ratio. The deterioration judgment part is configured to calculate an amplitude of an air-fuel ratio of an exhaust gas flowing out from the catalyst due to the lean control and the rich control based on an output of the air-fuel ratio detection device and judge that the catalyst is deteriorating if the amplitude is equal to or greater than a threshold value.
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Patent Agency Ranking
公开(公告)号：US10815853B2
公开(公告)日：2020-10-27
申请号：US16227665
申请日：2018-12-20
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Takeru Shirasawa , Toru Kidokoro , Makoto Ogiso , Kenji Furui
Abstract: When an abnormality diagnosis of an SCR catalyst is carried out, diagnostic supply control is carried out in such a manner that the first estimated adsorption amount, which is an amount of adsorption of ammonia in the SCR catalyst at the time when the SCR catalyst is assumed to be in a predetermined abnormal state, becomes equal to or more than a first predetermined adsorption amount, and the second estimated adsorption amount, which is an amount of adsorption of ammonia in the SCR catalyst at the time when the SCR catalyst is assumed to be in a predetermined normal state, becomes smaller than a second predetermined adsorption amount. Then, supply decreasing control to decrease an amount of adsorption of ammonia in the SCR catalyst is carried out, after the end of the execution of the diagnostic supply control.
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公开(公告)号：US10138786B2
公开(公告)日：2018-11-27
申请号：US15502070
申请日：2015-08-04
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Arifumi Matsumoto , Toru Kidokoro , Taiga Hagimoto , Kenji Furui , Akifumi Uozumi
Abstract: An additive amount of a reducing agent to a selective reduction-type NOx catalyst is optimized. An ammonia adsorption amount of the selective reduction-type NOx catalyst is estimated based on one or a plurality of prescribed parameters related to the ammonia adsorption amount and a specific ammonia adsorption amount that is an estimated value of the ammonia adsorption amount specified by at least one of a maximum value and a minimum value of an estimated value of the ammonia adsorption amount is estimated based on an error in the prescribed parameter, and when the specific ammonia adsorption amount is outside a target range of the ammonia adsorption amount, addition of an ammonia precursor or ammonia using an adding valve is controlled such that the specific ammonia adsorption amount returns to the target range.
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公开(公告)号：US10125654B2
公开(公告)日：2018-11-13
申请号：US15103106
申请日：2014-12-19
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Taiga Hagimoto , Tomoyuki Kogo , Arifumi Matsumoto , Kenji Furui , Akifumi Uozumi
Abstract: An exhaust control system for an internal combustion engine comprises: a trapping capability acquisition part that obtains information regarding a PM trapping capability, based on a detection value of an exhaust sensor provided to detect a predetermined parameter relating to an exhaust gas flowing out of an SCRF; and a NOx reduction capability acquisition part obtains information regarding a NOx reduction capability, based on an amount of NOx in the exhaust gas flowing out of the SCRF. The exhaust control system determines and distinguishes between a trapping abnormal state in which a PM trapping function by the SCRF is failed and a sensor abnormal state in which a detection function of the predetermined parameter by the exhaust sensor is failed, based on the NOx reduction capability obtained by the NOx reduction capability acquisition part, when the trapping capability obtained by the trapping capability acquisition part is in a predetermined low trapping capability state. This allows for accurate abnormality determination with regard to the SCRF in the exhaust control system for the internal combustion engine having the SCRF.
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公开(公告)号：US10119448B2
公开(公告)日：2018-11-06
申请号：US15359712
申请日：2016-11-23
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Toru Kidokoro , Makoto Ogiso , Kenji Furui , Arifumi Matsumoto , Takeru Shirasawa
Abstract: Embodiments of the present disclosure may improve the accuracy of diagnosis in diagnosing whether an exhaust gas purification system having an SCR filter is faulty. It is determined that the exhaust gas purification system is faulty if the NOx removal rate with the SCR filter calculated using a measurement value of an NOx sensor is lower than or equal to a predetermined criterion removal rate. In the apparatus, 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 calculated. The value of the criterion removal rate is set higher when the differential pressure change rate at the time when the measurement value of the NOx sensor is obtained is lower than a predetermined threshold than when the differential pressure change rate is higher than or equal to the predetermined threshold.
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公开(公告)号：US09995197B2
公开(公告)日：2018-06-12
申请号：US15358542
申请日：2016-11-22
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Toru Kidokoro , Makoto Ogiso , Yuriko Hagimoto , Takeru Shirasawa , Ryohei Ohno , Kenji Furui
CPC classification number: F01N11/00 , B01D46/0036 , B01D46/448 , B01D53/9418 , B01D53/9431 , B01D53/9495 , B01D2251/2062 , B01D2255/911 , B01D2258/012 , B01D2279/30 , F01N3/035 , F01N3/2066 , F01N3/208 , F01N11/002 , F01N2550/05 , F01N2610/02 , F01N2900/0418 , F01N2900/0601 , F01N2900/1602 , F01N2900/1622 , F01N2900/1812 , Y02T10/24 , Y02T10/47
Abstract: 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.
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