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The purpose of a DPF (Diesel Particulate Filter)
0:40 - Opacity
1:30 - Effects of Particulate Matter
2:40 - DPF Regeneration
4:05 - DPF Replacement
4:30 - DPF Lifetime
As you may probably know, Diesel engines are a lot more harmful compared to gasoline ones, and that's because of 3 main reasons:
-Nitrogen Oxides (NOx)
-Black Carbon (or black smoke)
As a MOT Tester I can clearly see the difference - cars with DPFs have smoke emissions equal to 0. However, manufacturers are pretty indulgent and allow an opacity for the smoke of approximately 0.5 m-1. Just to make a comparison - Diesel without DPFs are allowed to have between 1.5 and 2.5 m-1 and car which usually fail the MOT emissions test have over 4 m-1 and that's when you see a lot of black smoke.
Diesel engines emit up to 40 times more particulate matter than gasoline ones. By adding a Diesel Particulate Filter, we are basically filtering any sort of particle with the diameter between 2.5 and 10 microns.
Now, some of you will wonder, why are those particles so harmful?
Well, first of all, you inhale them, and they remain stuck in your throat or lungs. The more particles we inhale, the more likely we are to experience lung or throat cancer.
So in order to reduce this, manufacturers came up with DPFs and believe it or not, they're extremely helpful. Smoke is almost zero, particles are filtered, and we have cleaner exhaust gases.
When I disassembled a DPF a few months ago, I was wearing gloves, a safety jacket and a mask and within 15 minutes, my entire skin beneath the safety equipment was completely red and itchy. I had headaches for the rest of the day and I was sneezing a lot.
Imagine having a city like New York or London full of Diesel cars without DPFs. It would be a natural disaster - too much particulate matter in the atmosphere.
New cars with DPFs in Europe now have Ad Blue which is based on urea from animals and it basically reduces the amount of Nitrogen Oxides.
The EGR or Exhaust Gas Recirculation valve also helps to reduce Nitrous Oxides emissions, but I'll cover that in a separate video.
Diesel Particulate Filters have been introduced in 2005, and starting with 2010, nearly all the cars equipped with Diesel engines had Particulate Filters.
The DPF gets stuffed with particulate matter from time to time, and they need to be burnt and eliminated. This is called DPF Regeneration and there 3 types of them:
-spontaneous (it happens while you're driving)
-dynamic (the DPF light will appear in the instrument cluster, so you need to drive continuously until it fades away)
-service (manual regeneration through a scan tool)
The best and fastest way to allow the DPF to regenerate while you are driving is to keep the engine at 3000 rpm constantly.
If you don't allow the DPF to perform a regeneration, it will eventually destroy itself, and replacing it will be the only solution.
If you need to replace the DPF, it would cost you over $1,500, so think twice before buying a car equipped with a Diesel engine.
The lifetime of a DPF is around 200,000km. It varies - you could have problems with it within 40,000 km if you only drive downtown for short distances. The DPF doesn't heat up, it doesn't work properly, and it will get damaged pretty quickly.
If you drive only on the highway, you could easily use it for over 350,000km. The average is around 200,000km but it varies depending on the driving style and conditions.
So this is the purpose of a Diesel Particulate Filter - to reduce particulate matter, black smoke, and to make our world cleaner.
AutoMate Training (DPF animation)
Chuki Beats (Music)