Patent ID: 7958873

Claim:
A system for reducing the temperature of exhaust gas in an exhaust gas recirculation loop of a vehicle's engine, the system including: an air-air EGR cooler having separate first and second flow paths, said first flow path positioned to receive exhaust gas from the vehicle engine during movement through the exhaust gas recirculation loop, and said second flow path having an inlet and an outlet; a compressor configured to compress ambient air and provide all of the compressed air flowing from the compressor, to the inlet of the second flow path, the compressed air drawing heat from the exhaust gas flowing through the first flow path as the compressed air flows through the second flow path; a turbine coupled to the compressor by a shaft and configured to receive the heated compressed air from the outlet of the second flow path, the turbine expanding the heated compressed air to cause rotation of the shaft, thereby rotating the compressor.