| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently ensure an air rate intaked to a cylinder, and prevent generation of smoke and deterioration of fuel consumption by arranging an EGR gas compressor driven by a turbine of a supercharger in an EGR passage, and arranging an intake passage for leading new air into the EGR passage arranged on an upstream side of the EGR gas compressor. SOLUTION: An EGR passage 9 is arranged to connect the exhaust passage 12 and an intake passage 11 of a supercharging engine 1, and an EGR gas compressor 5 is arranged in the EGR passage 9, and EGR gas G2 is boosted up so as to recirculate to the intake passage 11. An intake passage 13 for leading new air A2 is arranged in the EGR passage 9 arranged on an upstream side of the EGR gas compressor 5, a control valve 8 is arranged on a part for connecting the passages 9, 13 to each other, and the rate of EGR gas G2 and the rate of new air A2 are controlled by the control valve 8. In an ECU 20, outputs of a rotating speed sensor 14 and a load sensor 15 are inputted, the control valve 8 is controlled in compliance with an EGR map 30 which is inputted beforehand, and EGR control is carried out with an EGR rate which is set beforehand. |
