MicroSquirt.com read only forum (Jan.15,2018)

Update:

This continues to work very well. The only parameter I've changed from my initial guessed at settings is the proportional term from 25 to 33 to 50.

I'm now using:
10 ms
950 rpm
P = 50
I = 15
D = 5

That looks similar to what I was getting before tinkering with the PID control parameters. I documented what I did here.

I'm continuing to get good results with consistant AFRs. AutoTune seems less flakey since Gego is more stable.

I've changed to a more EFI friendly cam, so I've been repeating some of my AE and VE table tuning.

. . . squirt a small single shot of extra gas into the intake at a fixed time. You ...

I've been using the wideband EGO PID/Smith Predictor control algorithm for a while now, but aside from lowering Transport delay 2 from the default of 4000 to 800, I hadn't changed any of the other settings.

I wasn't able to find a guide to these settings, and it seemed to work OK while cruising so ...

You have verified the motor + software works well under retraction. If you repeated one of your tests and then drove the motor forward with a simulated warmup you should arrive at 290 steps, which should give about .241 in ((290/355)*.295).


I'll do more investigation as I'm able.


An easier ...

I looked at the data log, msq and don't see anything fishy. It does seem the idle should be the same if the steps are the same. The only thing I see is that the IACStart steps is 355 but in the table the steps only go up to 290 at the highest temperature. The way this is meant to operate is that ...

Al, here's a warmup datalog and a copy of my .msq.

At the end of the datalog the idle was at 550, I turned off the engine and restarted, and the idle went to 850 with the same number of steps reported.

Hmmm, I've now got a warmup idle that is 100-150 RPM lower than the idle speed on a restart. I increased step size from 2.5ms to 4.0 but it didn't seem to make a difference.

Thanks Al, I'll put this to use in the morning.

Joethemechanic, I had some similar wierdness when changing code versions once that I think had to do with it getting corrupted somehow.