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gnasher



Member Since: 27 Jan 2014
Location: Cardiff
Posts: 26

United Kingdom 
DPF Regeneration

Does anybody know the process of dpf regeneration, i.e. Does it operate on a timed cycle or simply when the filter is getting full ?.
I have not had any problems or warnings. However my driving style for the past 6 months or so has been short journeys.
I give it a quick 15 to 20 mile blast on the motorway most weeks.
My car is a my16 Autobiography.
Thanks.

Post #528650 Wed Jun 21 2017 9:39am
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Tim in Scotland



Member Since: 30 May 2005
Location: Driving along in my automobile
Posts: 15634

2013 Range Rover Sport SDV6 HSE Stornoway Grey

There is a sensor that detects how clogged the DPF is and then forces a regeneration. I had a software update on my last car that caused the DPF sensor to burn out on a weekly basis until LR had investigated the problem........... Your regime for DPF cleaning almost complies with LR's requirements - you have to maintain the revs above a certain level not the speed. There is a warning light on the dash that will come on when you need to force a regeneration too. 2015MY Corris Grey SDv6 HSE Dynamic, preceeded by a 2.7SE RRS, a 3.6TDv8 RRS, several FFRR's and 2 Evoques.
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW.... my fun car to enjoy bashing and denting 20 years old and still giving loads of fun

Post #528655 Wed Jun 21 2017 9:54am
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gnasher



Member Since: 27 Jan 2014
Location: Cardiff
Posts: 26

United Kingdom 

Thanks Tim. When I give it a burst I engage sport mode and keep the revs above 2k for about 10 miles approx.
No warning lights so far.

Post #528660 Wed Jun 21 2017 10:08am
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Tim in Scotland



Member Since: 30 May 2005
Location: Driving along in my automobile
Posts: 15634

2013 Range Rover Sport SDV6 HSE Stornoway Grey

I don't do much city driving in my cars and the only time I have experienced a regeneration was when the sensor mentioned above burned out. I wouldn't do it unnecessarily as your fuel consumption takes a hit each time you force a regeneration. 2015MY Corris Grey SDv6 HSE Dynamic, preceeded by a 2.7SE RRS, a 3.6TDv8 RRS, several FFRR's and 2 Evoques.
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW.... my fun car to enjoy bashing and denting 20 years old and still giving loads of fun

Post #528663 Wed Jun 21 2017 10:12am
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wilf



Member Since: 08 Nov 2012
Location: on the naughty step
Posts: 698

Well, there are two types of regeneration.

Both need the exhaust gas temp (EGT) to rise far enough that the carbon deposits in the DPF are burned and expelled as CO2.

Firstly, loading the engine (as in driving fast or up a steep hill) will naturally raise the EGT.

But if the sensor (which is simply a pressure sensor looking at differential pressure across the DPF) tells the ECU that the DPF is blocked past a certain limit, a "forced " regeneration will take place, whereby additional fuel is injected during the exhaust stroke to artificially raise the EGT. Sometimes, a little additional engine roughness will be felt while this happens, the mpg will be seen to drop, and after you park up and switch off, a "burning smell" and "pinging of exhaust" noises could be witnessed.

If anything goes awry with that, then continuous attempts by the ECU to force a regen will lead to diesel fuel getting past the piston rings and into the sump. Lots of that and you have a dead engine. Which is why you should never ignore a red warning light. MY2016 HSE D SDV6

By the age of 50 you have the face you deserve - George Orwell.

Post #528672 Wed Jun 21 2017 11:44am
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