Motec Idle control mass flow paramters

Can someone explain the functions of the following idle control parameters in motec M1 platform?

Idle mass flow integral minimum%

Idle mass flow integral Maximum%

Idle mass flow integral rate %/s

What values are being referenced for the minimum and maximum here? I got my idle control working well enough (+/- 30 rpm off target) however, i would like to understand the use of these values further as I'm using some slight integral for the mass flow.

These parameters limit the range of Idle Mass Flow Integral (%) to stop integral wind up/down

Idle Mass Flow (%) is the sum of Idle Mass Flow Feed Forward + Idle Mass Flow Integral + Idle Mass Flow Proportional.

Thanks for the clear explanation, Scott. So, if my main mass flow FF table is set up properly, would I benefit more from restricting the integral minimum and maximum thresholds? Or would a properly tuned FF require less integral correction in a way that higher limits won't be required to reach the integral targets?

apologies if my question raises any confusion haha

The integral component allows for correction of error over time.

If your feed forward table is correct then the error should be small and the integral shouldn't do much work anyway.

Airflow is pretty slow to change the engine speed compared to ignition timing so mass flow proportional is often not used.

The integral compontent may correct for changes in operating conditions not covered by the control system such as environmental or temperature differences.

Worth noting, the integral component of idle mass flow is based on the error between the idle ignition timing target and the current idle ignition timing.

The min and max need to be tight enough to ensure you don't reduce the idle mass flow too much particularly in idle entry.

Crystal clear and great point regarding idle entry. In this case, I would probably benefit from either adjusting the minimum integral threshold or the mass flow rate to a sensible value if a severe RPM undershoot is observed.

And if I understand correctly, having integral gain here is to correct(or reduce the extent) the idle ignition proportional part?

The integral is to gradually increase or decrease the idle air mass, either by throttle or bypass valve, assuming that the idle timing target is appropriate to maintain the idle aim