Quote:
Originally Posted by
Desert Racer (Post 216791)
European trucks have been using adblue for a while now to clean up diesel emmisions and are starting to become more common in Oz. They have a separate smaller tank along side the diesel tank.
As opposed to the truck I'm in, which has a DPF filter as needs to perform a 'burn off' to clear it out by sitting stationary high idling at around 1800 rev's the system then squirts a bit of fuel in the red hot exhaust for 20 to 45 mins. However the filter now needs replacing at a cost of $3500. Some trucks filters are around $10000.
Speaking to my sister in Yorkshire her diesel Honda CRV has a similar filter which now needs replacing. The cost of which takes the shine off the benefit of lower fuel bills.
Something to bear in mind of what needs replacicing down the track when tempted by 'cheaper running costs'
Maybe cars will soon be running adblue to as there is a network already in place for it?
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We just have to be careful to not mix up DPF (diesel particulate filter) with the SCR (selected Catalytic reduction/urea injection) and yes we are running both in Aust and will do for some time until we find a better way to target NOx.
The DPF is about removing the unburnt hydrocarbon from the exhaust and this is where regeneration cycles are used. If the catalyst in the exhaust doesnt get hot enough to incinerate the captured hydrocarbon under normal driving conditions, then a form of regen will occur. This is where exhaust gas temps need to be artificially increased to enable the burn to occur. This is with either dosing injections from the CR injectors or when CR isn't used dedicated dosing injectors in the manifold.
SCR is for targetting the nitros oxide emissions by adding the ammonia (from the Urea) into the catalyst. The ammonia catalytically reduces the NOx into water and nitrogen both harmless components.
We can and do use both systems in our euro 5 trucks in Aust and this isnt going to change for euro 6 as I think from memory, the increase to E6 has been more about the emissions defeat mechanisms rather than changes to the actual gas levels from E5.
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