| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control unit for an internal combustion engine, accurately suppressing freezing and sticking of an EGR valve. <P>SOLUTION: The internal combustion engine 10 includes an EGR system 40 formed of an EGR passage 41 for introducing exhaust gas from an exhaust passage 30 into an intake passage 20 and the EGR valve 42 to vary a flow passage area of exhaust gas in the exhaust passage 30. An electronic control unit 60 estimates whether liquid-phase water is adherent to the EGR valve 42 based on an engine operating state. When the electronic control unit estimates that liquid-phase water is adherent to the EGR valve 42, the electronic control unit forcibly opens and closes the EGR valve 42 to reduce the amount of water adherent to the EGR valve 42 in engine stopping operation. <P>COPYRIGHT: (C)2010,JPO&INPIT |
