Webasto-werk W. Baier Gmbh & Co.

Wilfried Meiler

Dieter Goerlich

Dieter Raethel

In an exhaust gas pipe of a diesel engine, a particle separator serving for reduction of the particle emission of the diesel engine by exhaust gas aftertreatment, a burner by which the particle separator can be regenerated by means of hot fuel gases delivered by the burner unit, the burner unit is so placed that, even in the case of leaks occurring at a flap valve for shutting off of the fuel gas line, no impairment of the operation of the burner is to be feared. For this purpose, upstream from the burner, a blower may be installed, which constantly provides air to the burner unit and the space of the fuel gas line between the flap valve and the burner unit, the air being discharged from the space into the environment by a vent pipe. In this way, exhaust gases, which leak past the closed flap valve into the fuel gas line, do not reach the burner and are discharged by the vent pipe into the enviroment. Alternatively, a suction blower can be placed in a vent pipe branching off from the space between the flap valve and the burner unit in the fuel gas line, this blower causing venting of the space, when the separator is not being regenerated and the flap valve is closed. According to another alternative embodiment, a bypass pipe goes from the space between the flap valve and the burner unit, into a section of the exhaust gas pipe located downstream from the separator. The discharge area of this bypass pipe is designed as an injector or ejector, so that a negative pressure is produced in the bypass pipe by which the space in the fuel gas line is vented.

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Weilheim, Germany

Wilfried Meiler