trying to understand the ETC/MAF torque intervention prevention patent that murfie posted but I can't find the thread so I'm posting here.
attached spreadsheet has the logic from the patent (best I can tell) so you can input numbers for MAF and throttle, + load etc to see what the algorithm produces.
USER INPUT CELLS HAVE RED BOLD TEXT
ETC MAF patent flow chart.xlsxECT MAF flowchart.JPG
2019 C7 Stingray M7 - long tube headers, 6.30/6.22 226/238 cam, supporting stuff, DOD and VVT delete.
Stock everything else
Yes and no; If they match you will accelerate as the TB will open to allow the engine to produce more power, if its slightly above it will do the same just faster. Too high and the request is unreasonable and you will get oscillations, too low and the tb will close and the car will die.
You are correct its not that simple; but that's the idea of it. I think it would use adaptive methods to idle such as the spark and TB modulation in conjunction with CL fueling to target stoich and desired idle speed. Then depending on trans type (auto or manual) it would use the ETC system to build tq reserve by letting the TC slip or disengage the clutches (or in a manual, the clutch has to be obviously pressed in or it will die) and control idle that way.
Brilliant, thankyou for this info
Great post. However, I've read it 6 times and still can't fully wrap my head around everything. I'm currently having some driveability issues. Specifically at low RPM and low load my timing jumps all over the place as my Spark Source repeatedly jumps between Base and Torque Control:
InkedDriveability Issues_LI.jpg
Does this mean my ETC Torque Request and/or Scheduled torque for these conditions is exceeding my Driver Demand tables? I have tried increasing the Driver Demand tables and that didn't seem to do the trick. I've also tried raising and lowering my Torque Tables for the given mapped points (and adjusting inverse tables), and I've adjusting my MAF Airflow vs Period.
I've attached a log with a cold start, cruise, and some high load conditions. Matching tune as well.
TTS V3 Drive 1 3.31.20.hpl
TTS V3 - increased MAF period table 3.30.20.hpt
i would very much like for this post to be stickied
Any news on part throttle torque control issues some of us are having?
Addition to my earlier post:
Still having issues with Torque Control. I have progressively changed my Torque tables up and down in increments of 10lb-ft for the problem areas and that hasn't made a difference. Next I've moved on to adjusting the Driver Demand tables in a similar fashion, but still no noticeable changes. Next I moved on to adjusting my timing in those problem areas. I lowered everything around 8 degrees (55 to 47) This has made it behave differently... Still not correct though. I have a bit more consistency in steady state cruising, but occasionally it does flutter in and out of Torque Control. The swings in timing seem to be more extreme now, but less often. It also seems to be way worse before everything is up to temperature.
4.23.20.PNG
4.23.20 pic2.PNG
Can anybody provide any insight as to what triggers Torque Control to kick in? From what I've read it sounds like your torque tables exceeding the driver demand tables, but adjusting those doesn't seem to make a difference. Also, what controls the timing while it is in Torque Control mode?
In the scanner I have available "Indicated Torque Reference". Does this represent the "Indicated Torque" or the "Indicated Estimated Torque"?