| 摘要 |
PURPOSE:To check the occurrence of smoke and white smoke, by compensating an EGR quantity according to the variation in the case where a fuel injection quantity is varied at a time when engine speed is less than the setting value, in case of a device which performs exhaust gas recirculation even at time of low speed. CONSTITUTION:During engine driving, a normal EGR control duty ratio is calculated from an engine speed and a fuel injection quantity with the specified map at an electronic control unit 56. And, whether the engine is in an idle running state or not is judged, and when No is the case, this control duty ratio is outputted as this time command value. On the other hand, when YES is the case, an idle time exclusive EGR control duty ratio is calculated. And, a correction quantity of this time EGR is calculated by an injection quantity in a difference between this time fuel injection quantity and learning value of the fuel injection quantity, and the correction quantity is subtracted from the control duty ratio at the time of idling whereby the control duty ratio coming to this time command value is operated, thus opening of an EGR valve 54 is controlled via a vacuum regulating valve 55. |
