What it does
In closed loop boost control, the integral term looks at error that has built up over time, not just the error right now. If boost sits a little under target, the integral keeps adding duty until the gap closes. Integral gain sets how strongly it reacts to that accumulated error.
A typical place to start is somewhere between 50 and 200.
How to tell if it's right
- Too low: boost settles a little off target and is slow to correct.
- Too high: boost overshoots and swings back and forth around target.
Get your closed loop base duty cycle close first, so the controller only has small errors to correct. Then adjust integral gain in small steps, logging boost against target each time. Tune it together with proportional gain and derivative gain. Our boost control setup guide covers the full picture.
