摘要:
Various methods and systems are provided for an exhaust gas recirculation (EGR) EGR cooler (200) for an engine system (100). In one example, the EGR cooler (200) includes a first section (203) with a first group of tubes (270) adapted to flow exhaust gases (272), and also includes a first group of passages (271) formed by exterior surfaces of the first group of tubes (270) and adapted to flow coolant from a coolant source (152). The EGR cooler (200) also includes a second section (205) including a second group of tubes (260) adapted to flow coolant from the coolant source (152), and a second group of passages (225) formed by exterior surfaces of the second group of tubes (260) and adapted to flow the exhaust gas (272) from the first group of tubes (270).