| 摘要 |
An object of the present invention is to provide an abnormality detection device that is used for an internal combustion engine whose operation is controlled in accordance with the properties of employed fuel, and capable of accurately detecting an abnormality in a fuel property sensor used to determine the fuel properties, and more particularly, a stuck fuel property sensor. The abnormality detection device is configured so that a measurement section of the fuel property sensor is housed in a fuel container, which is not disposed in a main flow path of a fuel flow path connecting a fuel pump to an injector, but is disposed apart from the main flow path. The fuel drawn from a fuel tank is introduced into the fuel container. The resulting output value of the fuel property sensor is acquired as a first sensor output value. Further, the fuel is discharged from the fuel container. The resulting output value of the fuel property sensor is acquired as a second sensor output value. The first and second sensor output values are then used as the information for abnormality judgment to check for an abnormality in the fuel property sensor. |
