| 主权项 |
1. An exhaust gas recirculation (EGR) system for an internal combustion engine, comprising:
an EGR duct configured to effect fluid communication between an exhaust duct and an intake duct of the internal combustion engine; a heat exchanger having a first flow passage and a second flow passage, the first flow passage being in fluid communication with the EGR duct, the second flow passage being configured to receive a heat transfer medium from a heat transfer medium source; an upstream purge valve in fluid communication with the second flow passage of the heat exchanger, and configured to effect selective fluid communication between a purge fluid source and the second flow passage of the heat exchanger, the purge fluid source being distinct from the heat transfer medium source; and a controller operatively coupled to the upstream purge valve, the controller being configured to purge the second flow passage of the heat exchanger at least in part by opening the upstream purge valve. |
