| 摘要 |
PURPOSE:To properly perform EGR control by detecting variation of intake swirl strength, and adjusting EGR quantity in response to an engine operation condition based on the detection signal in the case that abnormality is found at a member for controlling a variable swirl means. CONSTITUTION:At respective sub-intake passages 8 connected to intake ports 3 in cylinders 2 of an engine 1, flow sensors 10 are arranged at the upstream side of control valves 9. A lift quantity of each EGR valve 12 is adjusted by controlling at least each actuator 17 based on the detection signal of at least each flow sensor 10. In this case, the lift quantity of the EGR valves 12 is adjusted according to a specified map corresponding to an operation condition of the engine 1. Consequently, even if abnormality occurs in the control valves 9 to vary flow quantity of intake air which passes through sub-intake passages 8, which results in that a swirl ratio is varied, adjustment of the EGR quantity in response hereto is properly performed. |
