Capp777 and MPD56 and everyone else who has contributed,
Thank you for your hard work and time, it is much appreciated.
A “Regen in progress” indication would be nice, but currently, I find more utility in a “Regen is about to occur” indication. I use EGT 12 for showing an active regen and while the soot level (DPF pressure) works for “about to occur”, I wanted something easier to read.
I’ve taken your DPF soot formula and converted it to a percentage. My reasoning is that I want to know when the truck is about to enter an active regen cycle so I can plan my drive to accordingly. I do more short distance than I’d like to so when the soot level gets close, I will take the scenic tour to allow the regen cycle to complete. Moreover, I set a flag so the display flashes when it hits 95% because that puts me in the window to expect a regen at any time.
22042c
DPF Soot Level Percentage 6.7L PSD
DPF %
0
100
x1
Percent
((((A*256)+B)*(100/65535))1)/1.75*100
The assumptions I’ve made:
1) minimum soot level is 1.0 (during a passive regen while towing, I got down to 0.85 so I got a negative percentage)
2) maximum soot level is 2.75 (2.67 seems to be a common number but I was seeing 2.75 over the winter before a regen would start–simple fix in the equation, change 1.75 to 1.67 if you want to use 2.67 as max soot level)
Methodology:
By subtracting 1 from your formula, it normalizes so that minimum soot becomes zero and max soot becomes 1.75. Then dividing by 1.75 and multiplying by 100 converts to a percentage.
It’s not a perfect solution but it works well for my purposes.
Thanks again for providing the info.
Bob
