公开(公告)号：US10072544B2

公开(公告)日：2018-09-11

申请号：US14976585

申请日：2015-12-21

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Hirotaka Saitoh ,  Koji Hagiwara ,  Takahiko Fujiwara ,  Toru Kidokoro ,  Yasushi Iwazaki

IPC: F01N3/00 ,  F01N3/08 ,  F01N3/20 ,  F01N11/00 ,  F02D35/00 ,  F02D41/02 ,  F02D41/14 ,  F01N13/00 ,  F02D41/40

CPC classification number: F01N3/0842 ,  F01N3/0814 ,  F01N3/0864 ,  F01N3/0871 ,  F01N3/2066 ,  F01N3/2073 ,  F01N3/208 ,  F01N11/007 ,  F01N13/009 ,  F01N2550/02 ,  F01N2900/0416 ,  F01N2900/1402 ,  F01N2900/1622 ,  F01N2900/1624 ,  F02D35/0015 ,  F02D41/0235 ,  F02D41/027 ,  F02D41/0275 ,  F02D41/0295 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/405 ,  F02D2200/0816 ,  Y02T10/22 ,  Y02T10/24 ,  Y02T10/47

Abstract: Deterioration of a selective catalytic reduction (SCR) catalyst can be diagnosed with sufficient accuracy, by making use of a sensor for measuring an air fuel ratio of exhaust gas flowing into an exhaust gas purification apparatus, which is equipped with the SCR catalyst, and a sensor for measuring an air fuel ratio of exhaust gas flowing out from the exhaust gas purification apparatus.

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

IPC: F01N11/00 ,  B01D53/94 ,  B01D46/00 ,  F01N3/035 ,  F01N3/20 ,  B01D46/44

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.

公开(公告)号：US09938876B2

公开(公告)日：2018-04-10

申请号：US15434621

申请日：2017-02-16

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Takeru Shirasawa ,  Toru Kidokoro ,  Makoto Ogiso ,  Kenji Furui

IPC: F01N3/20 ,  B01D53/94 ,  F01N11/00

CPC classification number: F01N3/208 ,  B01D53/9409 ,  B01D53/9495 ,  B01D2251/2067 ,  F01N11/002 ,  F01N2610/02 ,  F01N2610/144 ,  F01N2900/0418 ,  F01N2900/1402 ,  F01N2900/1602 ,  F01N2900/1614 ,  F01N2900/1808 ,  F01N2900/1812

Abstract: When an integrated value of a determination value correlated with a command value for an amount of supply of a reducing agent at the time of the command value being larger than a command supply amount threshold value reaches an integration threshold value, a determination is made that a diagnosis condition is satisfied, and an abnormality in the supply of the reducing agent is diagnosed based on an integrated value of the command value for the amount of supply of the reducing agent and an integrated value of an estimated value of the amount of supply of the reducing agent, whereas in cases where a period of time in which the diagnosis condition is not satisfied is longer than a time period threshold value, an interval of supply of the reducing agent is extended.

公开(公告)号：US09903292B2

公开(公告)日：2018-02-27

申请号：US14921198

申请日：2015-10-23

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Hiroshi Miyamoto ,  Toru Kidokoro ,  Yasushi Iwazaki ,  Kenji Suzuki ,  Koji Ide

IPC: F02D41/14 ,  F02D41/22

CPC classification number: F02D41/1495 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/1494 ,  F02D41/222 ,  Y02T10/40

Abstract: An abnormality diagnosis system of limit current type air-fuel ratio sensors comprises a current detecting part and a sensor temperature control device. The abnormality diagnosis system uses the current detecting part to detect the output current of the air-fuel ratio sensor when the air-fuel ratio is made the rich air-fuel ratio in the state where temperature of the air-fuel ratio is made the first temperature and when the air-fuel ratio is made the rich air-fuel ratio in the state where the temperature of the air-fuel ratio is made a second temperature higher than the first temperature. It is judged that the air-fuel ratio sensor is abnormal if the output current when the temperature of the air-fuel ratio sensor is the first temperature is larger than the output current when it is the second temperature by a predetermined value or more.

公开(公告)号：US09624808B2

公开(公告)日：2017-04-18

申请号：US14847674

申请日：2015-09-08

Applicant: Toyota Jidosha Kabushiki Kaisha

Inventor： Hiroshi Miyamoto ,  Kenji Suzuki ,  Toru Kidokoro ,  Yasushi Iwazaki

IPC: F01N11/00 ,  F02D41/12 ,  F02D41/14

CPC classification number: F01N11/00 ,  F01N2550/00 ,  F01N2560/025 ,  F01N2900/0416 ,  F01N2900/0422 ,  F02D41/123 ,  F02D41/1456 ,  F02D41/1495 ,  F02D2041/1431 ,  Y02T10/47

Abstract: An air-fuel ratio sensor is provided in an exhaust passage of an internal combustion engine which can perform fuel cut control, and detects an air-fuel ratio of exhaust gas. The system calculates the response time of the air-fuel ratio sensor based on a changing output value of the air-fuel ratio sensor while performing or after fuel cut control, and compares the calculated response time and a threshold value to diagnose an abnormality. The abnormality diagnosis system is configured to correct the response time so that the response of the air-fuel ratio sensor is treated as becoming faster, the smaller the lean degree of the air-fuel ratio corresponding to the converged value of the air-fuel ratio sensor during fuel cut control; and diagnose an abnormality in the response of the air-fuel ratio sensor based on the corrected calculated response time and threshold value.

公开(公告)号：US20160069242A1

公开(公告)日：2016-03-10

申请号：US14847674

申请日：2015-09-08

Applicant: Toyota Jidosha Kabushiki Kaisha

Inventor： Hiroshi Miyamoto ,  Kenji Suzuki ,  Toru Kidokoro ,  Yasushi Iwazaki

IPC: F01N11/00

CPC classification number: F01N11/00 ,  F01N2550/00 ,  F01N2560/025 ,  F01N2900/0416 ,  F01N2900/0422 ,  F02D41/123 ,  F02D41/1456 ,  F02D41/1495 ,  F02D2041/1431 ,  Y02T10/47

Abstract: An air-fuel ratio sensor is provided in an exhaust passage of an internal combustion engine which can perform fuel cut control, and detects an air-fuel ratio of exhaust gas. The system calculates the response time of the air-fuel ratio sensor based on a changing output value of the air-fuel ratio sensor while performing or after fuel cut control, and compares the calculated response time and a threshold value to diagnose an abnormality. The abnormality diagnosis system is configured to correct the response time so that the response of the air-fuel ratio sensor is treated as becoming faster, the smaller the lean degree of the air-fuel ratio corresponding to the converged value of the air-fuel ratio sensor during fuel cut control; and diagnose an abnormality in the response of the air-fuel ratio sensor based on the corrected calculated response time and threshold value.

Abstract translation: 在能够进行燃料切断控制的内燃机的排气通路中设置有空燃比传感器，并且检测废气的空燃比。 该系统在进行燃料切断控制之后，基于空燃比传感器的输出值的变化来计算空燃比传感器的响应时间，并且比较计算出的响应时间和阈值以诊断异常。 异常诊断系统被配置为校正响应时间，使得空燃比传感器的响应被视为变得越来越快，空燃比的稀薄度对应于空燃比的收敛值越小 燃油切断控制时的传感器; 并基于经校正的计算出的响应时间和阈值来诊断空燃比传感器的响应异常。