| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas recirculation device for an internal combustion engine capable of estimating flow rate of exhaust gas re-circulated to an intake passage via each EGR passage respectively in the internal combustion engine including a plurality of EGR passages. <P>SOLUTION: In the exhaust gas recirculation device for an internal combustion engine provided with a high pressure EGR passage 20 and a low pressure EGR passage 21, a high pressure EGR valve 22 and a low pressure EGR valve 24, and controlling the low pressure EGR valve 22 with an open loop control, flow rate Ghpl of EGR gas passing through the high pressure EGR passage 20 and flow rate Glpl of EGR gas passing through the low pressure EGR passage 21 are estimated respectively based on oxygen concentration O2s of gas in the intake passage 3 at a downstream of an exhaust gas introduction position of the high pressure EGR passage 20, flow rates Gdpf and Gafm of gas and fresh air passing through an exhaust emission control catalyst 11 provided in an exhaust passage 4 between an exhaust gas take-out position of the high pressure EGR passage 20 and an exhaust gas take-out position of the low pressure EGR passage 21, and quantity Q of fuel supplied to a cylinder 2 per a unit time. <P>COPYRIGHT: (C)2009,JPO&INPIT |
