AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 117)

Tuning Guide 111
© 2014 AEM Performance Electronics
DBW PID Settings:
DBW Proportional Gain:
Proportional control is a pure gain adjustment acting on the magnitude of the target error to
provide the system response. The advantage of a proportional-only control is it can respond
quickly to large errors; when the error is large the proportional response will be large. The
disadvantage of proportional gain for DBW control is the proportional response will decrease
to zero as the engine speed gets closer to the idle target RPM, and this tends to result in
'hunting' or fluctuations in engine speed. It is recommended to begin tuning DBW feedback
with this value set to zero or very low values. If the system responds too slowly to quick
disturbances, increase this value slightly.
Min value = 0.000, Max value = 10.000
DBW Integral Gain:
Integral control uses an integrator or 'accumulator' method, essentially checking if the target
error is positive or negative and then taking one step up or one step down every 400ms to
reduce the target error. The advantage of integral response for DBW control is the throttle will
be slowly and smoothly adjusted until the engine speed reaches the target, and then remain
at whatever feedback value reached the target. Note: although Integral gain is less likely to
cause hunting or fluctuations than Proportional or Derivative gains, excessively high Integral
values will take steps that are too large which can result in instability.
Min value = 0.000, Max value = 300.000
DBW Derivative Gain:
The derivative term adjusts the feedback based on the rate of change of the target error.
Derivative control is used to reduce the magnitude of the overshoot produced by the
Proportional component and improve the combined controller-process stability. Note: For
most setups, it is recommended to leave the Derivative gain set to zero. For tuners who are
very familiar with PID feedback and are observing a situation that could be alleviated by
adjusting Derivative gain, it is recommended to use the Idle_Decel table rather than the
Derivative gain.
Min value = 0.000, Max value = 1.000
PID Integral Clamps:
DBW Integral Clamp High:
Maximum value for DBW Integral to prevent overshooting and better sync with target.
DBW Integral Clamp Low:
Minimum value for DBW Integral to prevent undershooting and better sync with target.
Sensor Smoothing:
DBW Accel Pedal Smoothing:
Value used to smooth signal. Min value = 0, Max value = 85.
DBW Throttle Smoothing: