| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust heat recovery system that enables improvement of regeneration efficiency of engine exhaust heat without deteriorating performance of an aftertreatment device.SOLUTION: An evaporator 3 of a Rankine cycle 7 is installed in an exhaust passage 10 located upstream of an aftertreatment device 9, and a bypass flow passage 13 enabling heat transfer to the aftertreatment device 9 is provided. A first three-way valve 14 connected to one end 13a of the bypass flow passage 13 is installed between the evaporator 3 and an expanding device 4, and a second three-way valve 16 connected to the other end 13b via an expansion valve 15 is installed between a condenser 5 and a refrigerant pump 2. When a temperature rise request of the aftertreatment device 9 is made, an ECU 8 performs control to cause the first three-way valve 14 to communicate the expanding device 4 and the bypass flow passage 13 with each other, cause the second three-way valve 16 to communicate the condenser 5 and the bypass flow passage 13 with each other, and drive the motor generator 12 so as to send out a refrigerant 6 from the expanding device 4 toward the aftertreatment device 9.SELECTED DRAWING: Figure 1 |
