Volkswagen has extended the engine
line-up for the Passat, its successful mid-size model. The saloon and
the estate versions are now available with a 100 kW/136 hp four-cylinder
turbo diesel engine. The 2.0-litre TDI with a six-speed manual gearbox
is fitted with a diesel particulate filter as standard.
The additive-assisted diesel particulate filter is located away from the
engine in the vehicle underbody. Its housing is made of stainless steel
and contains an innovative filter block made of silicon carbide (Si-SiC)
with alternate inlet and outlet channels. The inlet channels facing the
engine form a "cul-de-sac" for the soot particles. Only the
exhaust gasses are able to pass through the porous ceramic wall into the
neighbouring outlet channel.
The retained soot particles are incinerated at approximately 500 degrees
centigrade to prevent the filter clogging and to enable it to regenerate
continuously.
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