| 摘要 |
PURPOSE:To secure fail-safe at the time of abnormality, by detecting the abnormality of an alcohol sensor on the basis of a knocking correction value, and also, referring to a map on the basis of an ignition time control value and an engine operation state, and surmising the density of alcohol. CONSTITUTION:The density of alcohol in used fuel is detected by means of a sensor a, and also, a predetermined map c is selected by means of a means b. Also, an engine operation state is detected by means of a means d, and also, an ignition time basic control value is referred to from the map c by means of a means e. In addition, knocking is detected by means of a sensor f, and also, a knocking correction value is set by means of a means g. And the knocking correction value is added to the ignition time basic control value, and an ignition time control value is set by means of a means h. In this instance, when the knocking correction value becomes the outside of a predetermined range, the abnormality of the sensor a is decided by means of a means i. And the map is referred to on the basis of the engine operation state and the ignition time control value at the time of this abnormality, and the density of alcohol is surmised by means of a means j. |
