公开(公告)号：US20180258821A1

公开(公告)日：2018-09-13

申请号：US15917381

申请日：2018-03-09

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Masahiko MASUBUCHI ,  Toru Kidokoro ,  Yasushi Iwazaki ,  Koji Hagiwara ,  Hiroshi Miyamoto

IPC: F01N11/00 ,  F01N3/20 ,  F01N13/00

CPC classification number: F01N11/00 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/208 ,  F01N13/008 ,  F01N13/009 ,  F01N2560/026 ,  F01N2570/14 ,  F01N2610/02 ,  F01N2900/0422 ,  F01N2900/1602 ,  F01N2900/1616 ,  G01M15/102 ,  Y02T10/24 ,  Y02T10/47

Abstract: An object is to prevent a wrong diagnosis from being made in diagnosis of an NOx sensor provided downstream of an SCR catalyst. A diagnosis apparatus is applied to an NOx sensor provided in an exhaust system including an SCR catalyst, a reducing agent supply device, an NOx sensor, an exhaust gas purification device provided upstream of the SCR catalyst, and a controller configured to raise the temperature of the exhaust gas purification device and control supply of reducing agent so as to adjust the ammonia adsorption amount to a specific amount. The controller is further configured to perform diagnosis of the NOx sensor on the basis of the concentration of ammonia slipping out of the SCR catalyst and disallow diagnosis of the NOx sensor since the ammonia adsorption amount is adjusted to the specific amount until a specific time elapses.

公开(公告)号：US20180179979A1

公开(公告)日：2018-06-28

申请号：US15846569

申请日：2017-12-19

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Hiroshi MIYAMOTO ,  Koji HAGIWARA ,  Masahiko MASUBUCHI ,  Yasushi IWAZAKI ,  Toru KIDOKORO

IPC: F02D41/22 ,  G01N27/407 ,  G01N27/416 ,  G01N27/409

CPC classification number: F02D41/222 ,  G01N27/4073 ,  G01N27/4077 ,  G01N27/409 ,  G01N27/4163 ,  G01N27/4175 ,  G01N33/0037 ,  Y02A50/245

Abstract: An object is to estimate the responsiveness of an exhaust gas sensor with as high accuracy as possible and to determine abnormality in the responsiveness of the exhaust gas sensor accurately. A diagnosis apparatus for the exhaust gas sensor comprises a controller configured to perform oxygen concentration control to change the oxygen concentration in the exhaust gas, calculate a responsiveness index correlating with the responsiveness of the exhaust gas sensor by diving the largest value of an absolute change rate defined as the absolute value of the change rate of the output signal of the exhaust gas sensor during a reference period by the difference between the value of the output signal at the time when the absolute change rate becomes largest and the converged value of the output signal with the reference period, and estimate the responsiveness of said exhaust gas sensor on the basis of said responsiveness index.