| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust recirculation control device and an exhaust recirculation system of an internal combustion engine, capable of preventing corrosion of an EGR cooler or the like due to condensation water while securing an EGR operation region. <P>SOLUTION: This exhaust recirculation control device permits recirculation of exhaust gas from an exhaust passage 18w side of an engine 1 to an air intake passage 7w side and controls a recirculation amount of the recirculated exhaust gas on condition that a temperature of cooling water of the engine 1 reaches a preset threshold temperature or more. The exhaust recirculation control device comprises: a dew point temperature calculation part 31 calculating a dew point temperature of the recirculated exhaust gas on the basis of a pressure of the recirculated exhaust gas and a molar ratio of water in the exhaust gas of the engine 1; and a threshold temperature variable setting part 32 variably setting the threshold temperature in accordance with the dew point temperature. <P>COPYRIGHT: (C)2013,JPO&INPIT |
