-
公开(公告)号：US10519840B2
公开(公告)日：2019-12-31
申请号：US16038869
申请日：2018-07-18
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Kazuya Takaoka , Toru Kidokoro
Abstract: An object of the disclosure is to provide a technology that enables abnormality diagnosis of an NOx trap catalyst to make the diagnosis that the NOx trap catalyst is abnormal even if the degree of deterioration of the NOx trap catalyst is relatively small yet. When performing abnormality diagnosis of an NOx trap catalyst, a system according to the disclosure performs a lean temperature raising process, which is the process of raising the temperature of the NOx trap catalyst to or above a predetermined temperature while keeping the air-fuel ratio of the exhaust gas flowing into the NOx trap catalyst at a lean air-fuel ratio. The system diagnoses abnormality of the NOx trap catalyst on the basis of the NOx storage efficiency of the NOx trap catalyst or a parameter correlating with that NOx storage efficiency after the completion of the lean temperature raise process.
-
公开(公告)号：US10221746B2
公开(公告)日：2019-03-05
申请号：US14651739
申请日：2013-12-12
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Toru Kidokoro , Arifumi Matsumoto , Kazuya Takaoka , Hirokazu Nishijima , Taiga Hagimoto , Yuki Terui , Akifumi Uozumi
Abstract: The invention provides a technique for more accurately executing failure diagnosis for an exhaust gas control apparatus having both a selective reduction function and a filter function. To this end, a failure diagnosis apparatus according to the invention for the exhaust gas control apparatus having both the selective reduction function and the filter function computes a NOx purification rate pertaining to a case where the exhaust gas control apparatus is normal based on an estimated value of the amount of particulate matter (PM) collected or accumulated in the exhaust gas control apparatus and an estimated value of the NO2 ratio of exhaust gas flowing into the exhaust gas control apparatus, and determines that the exhaust gas control apparatus fails when the difference between the result of the calculation and an actual NOx purification rate exceeds a threshold.
-
公开(公告)号：US10065140B2
公开(公告)日：2018-09-04
申请号：US15083472
申请日：2016-03-29
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Kazuya Takaoka , Toru Kidokoro
Abstract: Embodiments of the present disclosure improve the accuracy of abnormality diagnosis of a particulate filter using the output value of a PM sensor provided downstream of the particulate filter in an exhaust passage. A configuration of the invention compares a change rate of an output value of the PM sensor prior to execution of a filter diagnosis process of diagnosing an abnormality of the filter based on the output value of the PM sensor, with a reference value and determines whether a filter abnormality process is to be performed. A higher value is set to the reference value, which is to be compared with the change rate of the output value of the PM sensor, in the case where the deposition amount of PM between electrodes of the PM sensor is expected to be large, compared with the case where the deposition amount of PM is expected to be small.
-
公开(公告)号：US09657666B2
公开(公告)日：2017-05-23
申请号：US15073913
申请日：2016-03-18
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Hirokazu Nishijima , Toru Kidokoro , Kazuya Takaoka
IPC: F01N3/00 , F01N3/02 , F01N3/10 , F01N3/20 , F02D41/02 , F01N3/08 , F01N9/00 , F01N11/00 , F01N3/021
CPC classification number: F02D41/0235 , F01N3/021 , F01N3/0842 , F01N3/0871 , F01N3/101 , F01N3/2066 , F01N3/2073 , F01N9/00 , F01N11/00 , F01N2430/06 , F01N2560/025 , F01N2560/05 , F01N2560/20 , F01N2900/1614 , Y02T10/24 , Y02T10/47
Abstract: In a failure diagnosis device of an emission control system that utilizes an electrode-based PM sensor provided downstream of a particulate filter in an exhaust conduit to diagnose a failure of the particulate filter, disclosed embodiments may suppress reduction of accuracy of diagnosis of a failure due to in-cylinder rich control. The failure diagnosis device of the emission control system starts application of a predetermined voltage to electrodes of the electrode-based PM sensor after a sensor recovery process that removes PM depositing between the electrodes of the PM sensor, and diagnoses a failure of the particulate filter based on an output of the PM sensor measured after elapse of a predetermined time period since the start of application of the predetermined voltage. The failure diagnosis device performs the sensor recovery process during in-cylinder rich control or triggered by termination of the in-cylinder rich control and subsequently performs a measurement process after termination of the in-cylinder rich control and the sensor recovery process.
-
公开(公告)号：US09650936B2
公开(公告)日：2017-05-16
申请号：US14613816
申请日：2015-02-04
Applicant: Toyota Jidosha Kabushiki Kaisha
Inventor： Koji Hagiwara , Toru Kidokoro , Yasushi Iwazaki
CPC classification number: F01N11/007 , F01N3/0814 , F01N3/0842 , F01N3/0871 , F01N3/2066 , F01N13/009 , F01N2550/02 , Y02T10/20 , Y02T10/47
Abstract: An object of the present invention is to detect an abnormality in an exhaust gas purification apparatus having an NSR catalyst and an SCR catalyst disposed on a downstream side of the NSR catalyst more favorably. Air-fuel ratio reduction control is executed to reduce NOx occluded to the NSR catalyst when an integrated value of an amount of NOx flowing into the NSR catalyst reaches an upper limit value of an amount of NOx that can be occluded to the NSR catalyst in a normal condition. It is determined whether or not the exhaust gas purification apparatus is in an abnormal state on the basis of a NOx purification ratio of the exhaust gas purification apparatus calculated at this time.
-
Patent Agency Ranking
公开(公告)号：US20160177804A1
公开(公告)日：2016-06-23
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.
Abstract translation: 公开了一种用于内燃机的诊断系统。 诊断系统可以包括电子控制单元。 电子控制单元可以确定是否满足预定条件。 预定条件可以是一旦累积在过滤器中的尿素水来源的沉积物以气态形式分离的情况下，与过滤器分离的颗粒物质的量大于或等于预定分离量。 当电子控制单元确定满足预定条件时，电子控制单元可能不会从基于滤波器压差的过滤器执行故障诊断，直到从确定到 满足预定条件。
-
公开(公告)号：US10746077B2
公开(公告)日：2020-08-18
申请号：US16116256
申请日：2018-08-29
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Koji Hagiwara , Yasushi Iwazaki , Toru Kidokoro , Hirotaka Saito
Abstract: An exhaust gas sensor is diagnosed with high accuracy as much as possible while maintaining the function of an exhaust system of an internal combustion engine. In a diagnostic apparatus for an exhaust gas sensor which is applied to an internal combustion engine including an exhaust gas sensor, a fuel supplier, a controller configured to carry out predetermined fuel supply processing and predetermined oxygen concentration processing, and which diagnoses the exhaust gas sensor based on an output value thereof, provision is made for the controller that sets as a diagnostic output value a first output value, which is an output value at the side of the highest oxygen concentration in the output value of the exhaust gas sensor in a measurement period, and performs the diagnosis of the exhaust gas sensor based on the diagnostic output value, when predetermined fuel supply processing is carried out in the measurement period.
-
公开(公告)号：US10480383B2
公开(公告)日：2019-11-19
申请号：US15935962
申请日：2018-03-26
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Hirokazu Nishijima , Toru Kidokoro , Kazuya Takaoka
Abstract: There is provided a technology pertaining to abnormality diagnosis of an NSR catalyst that enables the diagnosis that the NSR catalyst is abnormal to be made even when the degree of deterioration of the NSR catalyst is relatively small yet. An abnormality diagnosis apparatus is applied to an exhaust gas purification apparatus having an NSR catalyst and a fuel addition valve. The abnormality diagnosis apparatus includes a controller configured to perform a specific fuel addition process and diagnose the NSR catalyst. The controller starts the specific fuel addition process when the NSR catalyst is in a specific start condition, and diagnoses the NSR catalyst on the basis of the quantity of NOx flowing out of the NSR catalyst over a specific period in the period from when the specific fuel addition process is started to when the temperature of the NSR catalyst reaches the thermal desorption temperature.
-
公开(公告)号：US10385752B2
公开(公告)日：2019-08-20
申请号：US15179026
申请日：2016-06-10
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Arifumi Matsumoto , Taiga Hagimoto , Kenji Furui , Makoto Ogiso , Toru Kidokoro
Abstract: An amount of reducing agent adsorbed on a NOx catalyst when a reducing agent supply device is normal and a corresponding detected value may be estimated. The corresponding detected value may be detected by a NOx sensor, and the detected value may correspond to an amount of reducing agent adsorbed on the NOx catalyst. When the estimated amount of adsorption is larger than or equal to a first amount and is smaller than or equal to a second amount, a diagnosis of the NOx catalyst based on the detected value of the NOx sensor may be prevented. The first amount may be an amount of adsorbed reducing agent corresponding to a minimum value of the corresponding detected value. The second amount may be an amount of adsorbed reducing agent corresponding to the corresponding detected value when the amount of adsorbed reducing agent is zero and larger than the first amount.
-
公开(公告)号：US10288592B2
公开(公告)日：2019-05-14
申请号：US14962210
申请日：2015-12-08
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Kazuya Takaoka , Toru Kidokoro
Abstract: A function diagnostic system for a filter of an internal combustion engine may be provided. The function diagnostic system may include a PM sensor and an electronic control unit. The electronic control unit may be configured to: calculate a NOx conversion rate in the filter; determine whether a NOx converting function of the filter is normal; execute a sensor regeneration process for removing the PM deposited between an electrodes of the PM sensor; continuously monitor an output value of the PM sensor after a predetermined PM deposition restart time, after execution of the sensor regeneration process is finished; and determine that there is an abnormality in a PM trapping function of the filter, when the output vale of the PM sensor, which has been continuously monitored, is reduced when the electronic control unit determines that the NOx converting function of the filter is in a normal status.
-
-
-
-
-
-
-
-
-
Search Results
46
records
(took 0.023 seconds)
