WASTE HEAT UTILIZING DEVICE

摘要

PROBLEM TO BE SOLVED: To efficiently cool EGR gas and reduce the pressure loss of the EGR gas while preventing the temperature of operating fluid from being too high.SOLUTION: A first heat exchanger 31 and a second heat exchanger 32 are arranged in parallel in an EGR passage 65. When a control part S estimates that the EGR gas cooling performance of cooling medium in the first heat exchanger 31 is not reduced, a three-way valve 80 permits the flow of EGR gas into the first heat exchanger 31 and interrupts the flow of the EGR gas into the second heat exchanger 32. When the control part S estimates that the EGR gas cooling performance of the cooling medium in the first heat exchanger 31 is reduced, the three-way valve 80 interrupts the flow of the EGR gas into the first heat exchanger 31 and permits the flow of the EGR gas into the second heat exchanger 32.