METHOD AND DEVICE FOR PREVENTING FUEL FREEZING IN A POSTPROCESSING BURNER SYSTEM

Disclosed is a method for preventing fuel freezing in a postprocessing burner system with a burner 14 upstream of a particulate filter 12 (exhaust purification member) incorporated in an exhaust pipe. Fuel is fed from a fuel tank 16 served also for a diesel engine 1 (engine) to the burner 14 through a feed pipe 17, and excess fuel is returned to the fuel tank 16 through a return pipe 18. The fuel is periodically circulated between the burner 14 and the fuel tank 16 through the feed and return pipes 17 and 18 under a condition of ambient air temperature during vehicle travel being at or below a predetermined temperature.