| 摘要 |
An exhaust gas recirculation system (EGR) cooler for a boosted internal combustion engine has a housing 14 containing a rotating flow guiding matrix 10 (sometimes known as a thermal wheel). The housing has a first set of entry and exit ducts 22, 22' forming a part of the engine exhaust gas flow arrangement (112, 36, 32, 22, 22'; all fig 1) and a second set of entry and exit ducts 24, 24' positioned in rotational sequence after the first set of entry and exit ducts and forming a part of the boosted air intake arrangement (124, 24, 24', 114; all fig 1). The system includes at least one re-expansion duct 28 in the housing positioned in rotational sequence after the second set of entry and exit ducts for discharging a re-expanded cool air stream out of the re-expansion duct, and a third set of entry and exit ducts 26, 26' in the housing positioned in rotational sequence after the re-expansion duct and connected to the re-expansion duct for directing a re-expanded cool air stream from the re-expansion duct back through the housing and matrix to the ambient atmosphere. The system also has means for rotating the matrix, such that matrix is alternately heated by the exhaust gas stream and cooled by the charge air stream. |
