AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 247)

Page 247 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
O2 FB Over Clear
Units: On/Off Description: Sets O2 feedback to zero when ouside the load, coolant, or engine
speed thresholds. After these parameters are met, the next condition will typically be different
from before. This function is used to allow the O2 feedback to clear its memory and start from
zero again.
2-D Tables for O2 Feedback
O2 FB Time vs Temp Table
Units: Time After Start Time vs. Coolant Temperature, Description: This table disables the O2
feedback for a set amount of time to allow arich engine start and allow time for the O2 heater to
warm up.
O2 FB Pro Gain table
Units: Proportional Gain vs. RPM Description: Proportional control is a pure gain adjustment
acting on the error signal to provide the driving input. The advantage of a proportional-only
control is its simplicity. If AFR offsets can be tolerated, the use of a proportional controller may
be optimal. However, it will not eliminate the steady-state error that occurs after a set-point
change or a sustained AFR disturbance. Note: When tuning the O2 feedback and overshoot
occurs, lower this number. If undershooting the O2 Target, raise this number. Used to adjust the
speed of the system and reach the O2 Target quickly.