Patent ID: 7284544

Claim:
An exhaust gas recirculation device comprising: an exhaust gas recirculation passage of an engine; an EGR cooler provided within this exhaust gas recirculation passage; a bypass passage connected between the upstream side and the downstream side of said EGR cooler provided within said exhaust gas recirculation passage; an EGR valve provided within said exhaust gas recirculation passage on the downstream side of said EGR cooler; and a bypass valve for opening and closing said bypass passage, and further comprising a valve controlling means that has a function determining the timing period of flowing the high-temperature exhaust gas diverted from said EGR cooler into said EGR valve, and that controls in switching operation the bypass valve such that during said timing period, the high-temperature exhaust gas is not passed through the EGR cooler, but flown into said EGR valve through said bypass passage, and except during said timing period, the high-temperature exhaust gas is passed through said EGR cooler to be circulated.