Exhaust gas heat exchanger, exhaust gas recirculation system, and exhaust gas heat exchanging method

Claim 1

An exhaust gas heat exchanger for a system where means for compressing intake air-gas mixture is located upstream of an internal combustion engine and a part of exhaust gas discharged from the internal combustion engine flows into the intake air-gas mixture upstream of the compressing means, the exhaust gas heat exchanger comprising: a heat exchanging member defining an internal passage through which the part of the exhaust gas flows, the heat exchanging member being disposed within an intake pipe through which the intake air-gas mixture flows; an inflow pipe attached to the heat exchanging member, the inflow pipe introducing the part of the exhaust gas into the internal passage; an outflow pipe attached to the heat exchanging member, the outflow pipe introducing the part of the exhaust gas from the internal passage into the inflow pipe; and a discharge pipe attached to the heat exchanging member, the discharge pipe extending through the inflow pipe to discharge a condensate from the internal passage; wherein the heat exchanging member exchanges heat between the part of the exhaust gas in the internal passage and the intake air-gas mixture flowing across an outer surface of the heat exchanging member.