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Diesel engine exhaust gas treatment

Diesel engine exhaust gas treatment

Even the Euro4 Diesel engine used EGR technology. Euro5-6 AdBlue and particulate filter systems have been added. Let's review their main components:


EGR system:

  • valve, cooler

AdBlue system:

  • tank, filter-pump-feeder, injector

  • SCR catalyst temperature sensor, SCR catalyst

  • Ammonia oxidation (AOC) catalyst, temperature sensor after AOC

  • NOx sensor

Diesel particulate filter (DPF) system:

  • Temperature sensor before and after DOC (diesel oxidation catalyst), DOC

  • NOx after DPFhard

  • diesel fuel dispenser

The cooperation of all these is coordinated by the engine controller, i.e. error-free operation and error-free coordination of 17 main components. If it works well, they meet the Euro5-6 standard.

What happens when the particulate filter is full?

The manufacturer deals with this by "REGENERATION", i.e. by injecting extra diesel into the exhaust, thereby heating up the DOC and DPF parts in an extreme way, by which time the deposited tar,soot and other carcinogenic particles, on the one hand, continue to burn, and on the other hand, leave with the "draft". If the burnout:


  • then the AdBlue system (SCR and AOC) is not blocked

"less successful":

  • failed to burn properly = DPF repair service

  • but the AdBlue system (SCR and AOC) was not clogged

"completely failed":

  • failed to burn out properly = DPFrepair service

  • clogged AdBlue system (SCR and AOC) = SCR repair service

Where is the Euro5-6 norm in this case? 

Who will "REGENERATE" the damage to the environment with this extreme pollution?

In the case of a pure LPG engine, there is no need for a particulate filter, because there is nothing  filter out.


Extreme, but existing examples

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