Exhaust device of internal combustion engine

摘要

An exhaust device of an internal combustion engine includes a burner device (40) including a fuel addition device (15) for adding fuel to an exhaust passage (12) of the internal combustion engine (1), and igniting the added fuel, and a controller (50) which detects an abnormal condition of the burner device (40) on the basis of a temperature change at a temperature detection point in the exhaust passage (12) downstream of the fuel addition device (15) after changing the amount of addition of the fuel.

主权项

1. An exhaust device of an internal combustion engine comprising:
a burner device comprising a fuel addition device configured to add fuel to an exhaust passage of the internal combustion engine and ignite the added fuel; and a controller which is configured to control said burner device, wherein said controller is further configured to: (i) control said fuel addition device to stepwisely decrease an amount of addition of fuel; (ii) obtain a delay time, from a time at which an amount of addition of fuel is stepwisely decreased, to a time at which a temperature at a temperature detection point in the exhaust passage downstream of the fuel addition device stepwisely decreases; and (iii) determine that the burner device is abnormal if the delay time is equal to or longer than a predetermined reference delay time.