| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technology accurately calculating both of low pressure EGR rate and high pressure EGR late, stabilizing intake air temperature and supercharging pressure by closed loop control of flow rate of both in a low pressure EGR passage and a high pressure EGR passage, and inhibiting deterioration of exhaust emission in an exhaust gas recirculation device for an internal combustion engine. <P>SOLUTION: This exhaust gas recirculation device calculates low pressure EGR rate indicating ratio of low pressure EGR gas quantity to intake air quantity sucked by the internal combustion engine and high pressure EGR rate indicating ratio of high pressure EGR gas quantity to intake air quantity by using CO<SB>2</SB>concentration in an intake passage in a downstream of a connection section of the low pressure EGR passage and in an upstream passage of a connection section of the high pressure EGR passage, CO<SB>2</SB>concentration in the intake passage in a downstream of the connection part of high pressure EGR passage, and CO<SB>2</SB>concentration exhausted from the internal combustion engine (S103). The device controls the low pressure EGR rate and the high pressure EGR rate to be calculated to each target value (S104). <P>COPYRIGHT: (C)2009,JPO&INPIT |
