Engine-proximate diesel particulate filter DDE6.3 - M67TÜ

To comply with the EU4 legislation taking effect as of 2005, a coated diesel particulate filter is necessary on certain vehicles.
This diesel particulate filter separates the soot particles in the exhaust gas with high efficiency (> 95 %). The diesel particulate filter has no influence on the nitrogen oxide (NOx) emissions; these are reduced by measures inside the engine.
The particulate filter system used at BMW requires no maintenance and is designed to last the service life of the vehicle. A fuel additive for filter regeneration is not necessary.

Each cylinder row of the M67TÜ is fitted with a diesel particulate filter close to the engine; this is located together with the oxidation catalytic converter in one housing.
The filter element consists of a ceramic monolith made of silicon carbide that is resistant to high temperatures. The filter element is 50 % porous and has been given a platinum-based, catalytic coating. This coating ensures that the soot ignition temperature is reduced, thus ensuring good regeneration properties of the particulate filter.

Changes for the particulate filter system

For the actual function of the diesel particulate filter, the following changes have been added:

• Exhaust system with catalyst-coated soot particle filter and oxidation catalytic converter for each row in one housing
  
• One throttle valve per row for engine-internal exhaust gas temperature increase
  
• Two exhaust gas temperature sensors per row for initiating the filter regeneration
  
• An exhaust backpressure sensor per row to estimate the filter load while the vehicle is being driven
  
• Extended software of the engine management system
  

Use

The engine-proximate diesel particulate filter is deployed as follows:

• E65 M67TÜ: From 03/05