EXHAUST HEATING DEVICE FOR INTERNAL COMBUSTION ENGINE AND CONTROL METHOD THEREFOR

An exhaust heating device (39) according to the present invention for heating an exhaust gas led to an exhaust purifying device (31) from an internal combustion engine (10) is disposed in a second exhaust passage (28s) that is located upstream of a confluent portion (26c) of a first exhaust passage (27f) connected through an exhaust turbine (29b) of a first turbocharger (29) to the purifying device and the second passage connected to the purifying device through an exhaust turbine (30b) of a second exhaust turbocharger (30) used primarily in a lower speed range of the engine than the first turbocharger in a state of bypassing the turbine of the first turbocharger and downstream of the turbine of the second turbocharger, and a valve (36) capable of regulating a flow of the exhaust gas flowing in the second passage is disposed in the second passage that is located downstream of a branch portion (26d) of the first and the second passages and upstream of the turbine of the second turbocharger.