Originally Posted by Benn0
ok, just wondering if we can identify a difference in behaviour pre update to post update.....
The sequence of when it regens seems to be the pretty much same with XTRmn8 and Barboots (pre update) and mine (post update).
Our sta-testicle analysis only has a sample size of about half a dozen events, so make up your own conclusion from that.
Originally Posted by jeepless
Yes I have.I kept driving, only around the burbs, and the filter cleared.
At the time I thought "woo hoo "my system works but 1mth later had limp mode.
I think the evic warning must be if you reach a high (unknown?) % and yes your GC would have had many regens by now, mine's about 2 per tank full.
From monitoring I've noticed mine jump over 35% between glances and then slowly reduce to a lower reading. I have also seen 40% plus range variation on a short 5min cruise.
So it would seem possible that you could be at 65%plus, have a jump in readings and end up over 100 %possibly causing limp mode.
Hopefully the 10 min fix may allow %to decrease in time to avoid this.
Ps. I have now had it confirmed that I have the new (18 Dec) fix installed.
The differential pressure in the DPF is probably tricky to measure when the filter is part loaded, as in it would fluctuate with gas flow so the % full value that is calculated from the flow & pressure (probably with some sort of timed average) might go up and down i would guess.
I have seem it suddenly leap 15% or sometimes suddenly drop 30% only to slowly come back up to what it was after several minute more driving.
I also thought that hey if it wa at 65% and then suddenly jumped to 100% would it go straight to limp mode
From all thestories here, it seems that the EVIC always gives the (80%?) warning that a regen always starts first and then it goes to limp mode after
that. That is the right way to do it I guess but the Limp mode is just happening too soon
If I was the one programming the logic
then I would do this.
- Do regen without any message at 65% when in the ideal highway condtion. This keeps optimal minimal back pressure for higher exhaust flow highway driving without wasting to much fuel by doing it too frequently
- Do regen without any message at 70-75% when the car is warmed up in urban driving conditions and allow the sequence to abort it if necessary (ie gets too hot or sitting at extended idle or the engine is shut off)
- Do regen with EVIC message advising not to stop driving at triggered at (80%?) to alert the driver that the filter really is full this time and it this might be the last chance to properly clean the filter so don't turn the engine off.
- Safety Limp mode only after this 80%+ regen has failed
and after some duration of regen. 10minutes would be appropriate. Most of the soot in the filter would be combusted in a 10min of regen sequence. 10seconds(?!) is obvoiuisly not suitable.
Really there should be no way that the vehicle should go to limp mode without first attempting the 80% DPF burn for some duration.
Therefore the limp mode would only occur if there is some other serious problem where the regen is not working properly.
If there is a failure such as damaged/crushed/blocked sensor pipe which is a mechanical problem then that would be an example one such reason
If one of the temperature or pressure sensors fail independently its an electrical problem and I'm sure that there is a MIL specific to that sensor rather than going to a DPF full limp mode.
I'd also like to have a subtle DPF level indicator in the EVIC display in some menu somewhere.
Maybe the one with the temps, voltage and tyre pressure.
Just a discreet white line graph like the temps and maybe a status as "particle filter self clean mode" (and a maybe smiley face
No alarms or red zones or beeping or messages that pop up. Nothing that says injecting extra fuel and burning soot away. warning warning 650C exhaust, fire hazard, don't park in long grass. Please ignore the burning rubber smell. None of that. Just an indicator somewhere.