1.0 KiB
Step 1. Set bias curve.
1.1 Calibrate throttle position sensor in your electronic throttle body.
Zero position usually requires you to push throttle closed. Full throttle would definitely require you to push throttle open.
Default position is usually somewhere around 4-8%.
1.1 Feed-forward curve/Bias curve.
"Bias curve" is a curve of PWM duty cycle values which kind of get TPS close to desired value, for each of the 8 points on the curve. It measures how much duty is required to hold the throttle at that spot.
The goal is that at position X, the bias will somewhat hold it there on it's own.
Bias is also known as feed-forward.
We are interested in positions like 0, between-0-and-default, default, a bit open, a bit more open, 50% open, wide open,
Set P=I=D=0. Set curve to all zeros.
Now use offset (offset is same thing as constant bias) to manually control duty cycle. Try different values and see which offset sets throttle to closed, which offset starts to open throttle, which offset is enough to open throttle completely.