| 摘要 |
<P>PROBLEM TO BE SOLVED: To materialize high EGR rate without causing great deterioration of fuel economy. <P>SOLUTION: This device is provided with a low pressure loop 14 drawing part of exhaust gas 9 out from an exhaust passage in a downstream of a turbine 2b and re-circulating the same to an intake pipe 5 in an upstream of a compressor 2a, and a high pressure loop 15 drawing part of exhaust gas 9 out from an exhaust manifold 10 and re-circulating the same to a part in a neighborhood of an inlet of an intake manifold 10, EGR valves 19, 21 provided in the low pressure loop 14 and the high pressure loop 15 and adjusting recirculation quantity of exhaust gas 9, and a control device 23 controlling each EGR valves 19, 21 performing base exhaust gas recirculation at EGR rate which is in a level not generating black smoke at a time of acceleration by the low pressure loop 14 and performing additional exhaust gas recirculation to compensate insufficient EGR rate part by the high pressure loop and coping with avoidance of black smoke at a time of acceleration mainly by immediately reducing recirculation quantity of exhaust gas 9 in the high pressure loop 15 side. <P>COPYRIGHT: (C)2007,JPO&INPIT |
