| 摘要 |
PROBLEM TO BE SOLVED: To provide an EGR system for introducing EGR gas near the inlet of a compressor in an intake passage while compatibly preventing the erosion of an impeller due to condensed water produced in an EGR passage and suppressing the pressure loss of intake air.SOLUTION: An introduction port for EGR gas, formed in the wall face of the intake passage near the inlet of the compressor, is connected to an exhaust passage via the EGR passage. In the EGR passage, an EGR valve is provided, and in the downstream of a position of the exhaust passage where the EGR passage is connected, an exhaust throttle valve is provided. A control device for controlling the EGR valve and the exhaust throttle valve controls the openings of the EGR valve and the exhaust throttle valve depending on the flow amount of fresh air flowing in the compressor to change the velocity of the EGR gas flowing from the introduction port for the EGR gas into the intake passage so that the EGR gas is directed to the center of the impeller of the compressor. |
