Nixon & Vanderhye P.C.
Exhaust gas recirculation system having cooler
An exhaust gas recirculation (EGR) system of an internal combustion engine has an EGR cooler in an EGR passage connecting an exhaust manifold with an intake manifold. The EGR cooler cools EGR gas recirculated through the EGR passage. Cooling performance detecting means included in an electronic control unit (ECU) determines that cooling performance of the EGR cooler is degraded when intake pressure measured by an intake pressure sensor is lower than a normal intake pressure by at least a predetermined value. When the degradation of the cooling performance is detected, cooling performance regeneration controlling means included in the ECU increases the temperature inside the EGR cooler by heating the exhaust gas to eliminate soot or unburned hydrocarbon by oxidization. Thus, the cooling performance of the EGR cooler is regenerated.
Denso Corporation
F F F F F F F
F02M F02M F02M F02D F02M F02M F02M
additional inventional additional inventional inventional inventional inventional
Shigeto Kiyonori Tsukasa Makoto Masumi
Yahata Sekiguchi Kuboshima Saito Kinugawa