| 摘要 |
PROBLEM TO BE SOLVED: To suppress that a temperature of a catalyst is excessively raised when a grill shutter is failed in a vehicle.SOLUTION: An air introduction part 20 for taking in outside air 58 is formed in an engine room 14 in which a front engine 30 of a vehicle 10 is disposed. The air introduction part 20 includes an air introduction passage 22, a grill shutter 24 being an opening/closing mechanism of the air introduction passage 22, and an opening/closing part 26 for opening and closing the grill shutter 24. A control device 60 comprises a failure detection part 62 which detects a closing failure of the grill shutter 24, and a temperature maintaining control part 64 which maintains a temperature of a catalyst 52 within a prescribed range. The temperature maintaining control part 64 includes a threshold temperature relationship change part 66 which changes a threshold temperature applied with an increase coefficient or an estimated temperature of the catalyst 52, and makes the increase coefficient easily applicable, and an increase coefficient value change part 68 which changes a value of the increase coefficient. |
