公开(公告)号：US20190195112A1

公开(公告)日：2019-06-27

申请号：US16200703

申请日：2018-11-27

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： Akiyoshi Negishi ,  Shin Okada

IPC分类号： F01N11/00 ,  F02M35/10 ,  F01N13/00 ,  F01N3/20 ,  F01N3/10

CPC分类号： F01N11/002 ,  F01N3/021 ,  F01N3/103 ,  F01N3/206 ,  F01N11/007 ,  F01N13/008 ,  F01N2550/05 ,  F01N2560/025 ,  F01N2560/06 ,  F01N2610/03 ,  F02D41/024 ,  F02D41/1439 ,  F02D41/1446 ,  F02D41/1447 ,  F02D41/1454 ,  F02D41/1458 ,  F02D41/18 ,  F02D41/221 ,  F02D2041/1433 ,  F02M35/10386

摘要： An air flowmeter is arranged in an intake passage. An air-fuel ratio sensor is arranged downstream of an addition valve in an exhaust passage. An estimated air-fuel ratio is calculated based on an intake air amount detected by the air flowmeter and the sum of a fuel amount injected by a fuel injection valve and a fuel amount added by the addition valve. It is determined that there is a stuck-closed anomaly in the addition valve if the logical conjunction is true of a condition that a detected value of the air-fuel ratio sensor is greater than the estimated air-fuel ratio by a margin greater than or equal to a specified amount and a condition that a detected value of the exhaust temperature sensor in a period in which the addition valve adds fuel is smaller than a reference value in the period by a margin greater than or equal to a predetermined amount.