DPF regen

NZ XR6 · 06-05-2017, 08:08 PM

The last 2 regens that I've noticed were both still in progress when I stopped the car at the end of a trip. I'm a little reluctant to leave the car idling, as it does smell very hot.

So what is the best thing to do? I did think about driving around the block until the regen finished, or should I just leave it idling?

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**russellw** · 07-05-2017, 07:22 AM

Either will work fine although driving (in relatively free traffic) is probably the better option.

Cheers
Russ

cobrin · 07-05-2017, 01:45 PM

take it out for a drive 80kph in 4th for 10mins should be enough.

Well has been for me. I do have the twisties 7kms from home so that helps if it's been a while. I'll know it needs a good drive cause it'll get a tad smokey when I accelerate from 40kph to 100kph briskly or I notice soot from the headlights of the vehicle behind when taking off. I recently did a 200km trip (100km each way) on a long weekend couple of weeks ago and after overtaking the fourth vehicle there was little to no soot from the rear. Family behind me in another vehicle noticed big puffs till there was nothing.

Every now and then I'll give it the boot to monitor soot levels and gauge when to plan a trip. So many places to get out and explore in the Tropics I'm lucky it plays a part.

rondeo · 07-05-2017, 04:58 PM

I've never driven differently to start a regen.

I didn't think the driver was involved.

There's an algorithm for it: soot load, exhaust temp, DPF differential pressure.

Revving the engine to get the exhaust hot isn't going to start a regen unless the electronic controller decides it's time. Fuel vapour injection into the exhaust is then enabled and the DPF is held at 600 deg C for about 6 minutes, unless the engine is switched off. In that case, no matter, it will try again some other time.

NZ XR6 · 07-05-2017, 07:08 PM

It seems how you drive can affect the need to regen. It rarely happens during city driving, but the most recent started after I'd done a number of 10-15 minute trips on motorways. So cruising at 100 on flat roads seems to result in soot buildup, whereas city driving keeps the DPF cleaner. Not really what I expected.

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cobrin · 07-05-2017, 08:02 PM

that goes against everything known towards dpf's, I suspect that the hwy drive gives the ecu the condition to trigger a regeneration but pending on when it's started may catch you out when shutdown within the 15min trip.

rondeo · 07-05-2017, 10:21 PM

If it's true there's a catalytic coating on the DPF some regeneration goes on all the time the exhaust is hot enough.

In that theory 15 minute plus trips and high engine loads should result in less accumulated soot.

More soot burnt means more ash left in the filter.
This ash is not combustible so it remains there and slowly increases for the life of the filter.

Cobrin I'm practicing stabbing at the recirc button in case I get behind you one day.

You need to be quick behind a Nissan 4wd or else you'll be recirculating soot I think.

NZ XR6 · 08-05-2017, 07:49 AM

Quote:

Originally Posted by cobrin

that goes against everything known towards dpf's, I suspect that the hwy drive gives the ecu the condition to trigger a regeneration but pending on when it's started may catch you out when shutdown within the 15min trip.

That's what I expected too. Until last year, I'd always used my wife's old Accord for city driving and kept the Mondeo for longer, work trips.

But why did it take until the 6th, similar motorway journey for the ECU to decide on a regen? They were all at similar speeds and the last trip was probably the shortest, which makes me think that there was a soot buildup from the constant speed, low load running.

Maybe city driving with bursts of acceleration does a better job of keeping the DPF clean? I tend to accelerate briskly in the Mondeo, partly because it's how I drive, but also because I was concerned about soot buildup in the DPF.

NZ XR6 · 08-05-2017, 07:52 AM

Quote:

Originally Posted by rondeo

If it's true there's a catalytic coating on the DPF some regeneration goes on all the time the exhaust is hot enough.

In that theory 15 minute plus trips and high engine loads should result in less accumulated soot.

More soot burnt means more ash left in the filter.
This ash is not combustible so it remains there and slowly increases for the life of the filter.

Yes, the Mondeo (Peugeot) DPF has a catalytic coating.

cobrin · 08-05-2017, 11:24 AM

Quote:

Originally Posted by rondeo

Cobrin I'm practicing stabbing at the recirc button in case I get behind you one day.

You need to be quick behind a Nissan 4wd or else you'll be recirculating soot I think.

I'm hitting the recirc button too... My daily short trips play a big part in earlier soot buildup, so when I finally get to the HWY it's ready to blow it out the back and it's noticeable from the rear view mirror at times. I don't mind it, it is what it is. It's been two weeks since my last decent drive and it's not at any level to make me think I need to get it out on the HWY again.

Quote:

Originally Posted by NZ XR6

But why did it take until the 6th, similar motorway journey for the ECU to decide on a regen?

well accumulation will always build up, when the software deems levels are enough to regen it'll do it. It doesn't clean all the time as we know only when required (much like an oil filter but monitored in the case of the DPF) build up burn off - rinse and repeat.

cobrin · 08-05-2017, 11:32 AM

hmmm would be nice to kick it off at home and get it done...

https://www.youtube.com/watch?v=tLOGktd86Lo

rondeo · 09-05-2017, 10:03 AM

This morning the zetec came back from a 60km trip.

After being parked for 10 minutes I went to take it for fuel fill and noticed a regular dull thump thump noise at idle (no idea).

Lifted the bonnet and caught a whiff of regen.

Checked Forscan on the the phone and exhaust temp was 485 deg.

Soot was down to 25% so it was finishing off a regen.

Took about two minutes.

Thank goodness for DPF regens, another endless topic!

bundybear75 · 30-04-2018, 07:55 AM

Has anyone used the Penrite DPF cleaner (or similar) ?

https://www.penriteoil.com.au/produc...ro-dpf-cleaner

Is it just more hype or can it be beneficial?

After having a few issues with my DPF system (hopefully fixed with the replacement of a temp sensor) and over 200K km I am wondering if an occasional use of something like this would be beneficial.

Highway cruser · 06-05-2018, 02:32 PM

Quote:

Originally Posted by bundybear75

Has anyone used the Penrite DPF cleaner (or similar) ?

https://www.penriteoil.com.au/produc...ro-dpf-cleaner

Is it just more hype or can it be beneficial?

After having a few issues with my DPF system (hopefully fixed with the replacement of a temp sensor) and over 200K km I am wondering if an occasional use of something like this would be beneficial.

I used a similar one which seemed to help but that's only a fly by the seat of your pants thing, no monitoring of the electronics.

I have noticed that all of my regens happen on the highway or at around that speed. The other interesting thing I Ve noticed is, if I've been on the highway on the way home and come out of a section of road works with speed limits at 80 and then 60kph when I go back to 100kph using a bit of fight foot it's common place for this action and getting back to 100kph to start a regen.

stefcio007 · 18-06-2018, 11:42 AM

So found the message stored in the ECU that conditions were not met for DPF regen. Given the colder weather it's struggled to get to temp for a regen and I haven't driven on the freeway much.

Has anyone used

Quote:

Liqui-Moly Diesel Particulate Filter Anti-ClogAlgae Stop

?

It says on the product description

Quote:

***Not to be used in conjunction with Peugeot/Citroen electronically controlled fuel additive system.***

Given we have a Peugeot engine, does it also come with Peugeot designed DPF management system? Since instant fuel consumption goes up when a regen is occurring it would point to making this type of cleaner unsuitable since that means it does inject fuel when performing the regen?

rondeo · 18-06-2018, 02:36 PM

What was the message?

If I were on a quiz show I'd say Liqui-Moly would not fix the problem.

I'd never get on a quiz show though, especially one run by Liqui-Moly.

If it were that simple why would Ford use an expensive DPF?

Judging by this unhelpful obfuscation they don't want you to know what's in it anyway:

http://www.liqui-moly.com.au/msds/

The MSDS is #2729, and by the looks of it it would just blow up with the rest of it in the combustion chamber.

bundybear75 · 18-06-2018, 03:26 PM

***Not to be used in conjunction with Peugeot/Citroen electronically controlled fuel additive system.***

AdBlue maybe??

I think the latest is a combo of AdBlue and DPF to achieve Euro ratings....

rondeo · 18-06-2018, 03:48 PM

I'd be asking what the 'active ingredient' was, and where is the evidence that it works.

Vegemite, for example, lists the ingredients and a bit of Googling will show more info.

AdBlue is fed into the exhaust and reacts with the nitrogen oxide gas produced by the combustion process, breaking it down into harmless nitrogen and oxygen. ...

(Google)