发明名称 |
Apparatus for detecting imbalance abnormality in air-fuel ratio between cylinders in multi-cylinder internal combustion engine |
摘要 |
An apparatus for detecting imbalance abnormality in an air-fuel ratio between cylinders in a multi-cylinder internal combustion engine is disclosed. The apparatus includes an imbalance determining unit programmed to determine imbalance in an air-fuel ratio of a first cylinder belonging to a cylinder group based upon a difference value between an index value correlative with a crank angular speed detected in the first cylinder and an index value correlative with a crank angular speed detected in a second cylinder belonging to another cylinder group, and further a correction unit programmed to correct the difference value for the first cylinder based upon the index value detected in at least one of other cylinders belonging to the same cylinder group as that of the first cylinder. |
申请公布号 |
US9279378(B2) |
申请公布日期 |
2016.03.08 |
申请号 |
US201414186043 |
申请日期 |
2014.02.21 |
申请人 |
Toyota Jidosha Kabushiki Kaisha |
发明人 |
Katayama Akihiro;Akisada Kazuhiro;Insixiengmai Leuth;Maruta Sei;Nakagoshi Shinichi;Okada Masahide |
分类号 |
F02M41/08;B60T7/12;F02D41/00;F02D41/14 |
主分类号 |
F02M41/08 |
代理机构 |
Dinsmore & Shohl LLP |
代理人 |
Dinsmore & Shohl LLP |
主权项 |
1. An apparatus for detecting imbalance abnormality in an air-fuel ratio between cylinders in a multi-cylinder internal combustion engine provided with a plurality of cylinder groups configured with a plurality of the cylinders, comprising:
an imbalance determining unit programmed to determine imbalance in an air-fuel ratio of a first cylinder belonging to a cylinder group based upon a difference value between an index value correlative with a crank angular speed detected in the first cylinder and an index value correlative with a crank angular speed detected in a second cylinder belonging to another cylinder group; and a correction unit programmed to correct the difference value for the first cylinder by subtracting the difference value calculated for at least one of other cylinders belonging to the same cylinder group as that of the first cylinder or a value correlative therewith or by subtracting an average value of the difference values calculated for all other cylinders belonging to the same cylinder group as that of the first cylinder wherein a notification is provided to the user if an imbalance in the air-fuel ratio between the first cylinder and the second cylinder is detected. |
地址 |
Toyota-shi JP |