O2 Control
What is O2 Control?
O2 Control allows closed-loop (targeted) control of the fuel system via an O2 sensor that is used for AFR feedback to the Elite ECU. The Target Lambda table is used when a Wideband O2 Sensor is selected, and a Target Voltage table is used when a Narrowband O2 Sensor is selected. Corrections made by the O2 Control system are referred to as Short Term Fuel Trims (STFT) and are only temporary .i.e. they are not stored by the ECU. If the Long Term Control is enabled further corrections to the fuel system referred to as Long Term Fuel Trims (LTFT) are stored by the ECU and will not rest unless commanded to do so.
O2 Control Page
Bank 1
Select the type of sensor and the sensor number being used for O2 Control.
Bank 2
When a second engine bank has been configured, the type of sensor and sensor number on Bank 2 can be selected.
STFT Max Enrich
Sets the maximum positive (rich) correction that the Short Term Fuel Trim (STFT) will allow.
STFT Max Disenrich
Sets the maximum negative (lean) correction that the Short Term Fuel Trim (STFT) will allow.
Target Oscillation Amplitude
The desired amount oscillation around the target lambda or voltage. This only takes effect when the target lambda is 1.0la or 14.7 AFR. This function is used primarily for emissions purposes by improving exhaust catalytic converter efficiency by cycling the desired AFR slightly rich and lean of stoich. It is used more commonly for Narrowband O2 sensors to push the system into a forced oscillation. The value will be in User AFR units for wideband O2 sensors, or the amount of sensor voltage for Narrowband O2 sensors. (Default = 0, Typical Narrowband = 0.05V)
Eg, When Target Lambda is 14.7 AFR and Target Oscillation Amplitude is 0.1 AFR, the ECU will cycle between targeting 14.6 and 14.8 AFR, altering the target each time it is met.
Warm Voltage
Active only with Narrowband O2 sensors. The sensor voltage that if exceeded will bypass the Initial Engine Running Time. i.e. if a warm engine is shut down and then quickly restarted, the narrowband sensor is already in a usable temperature state, and the Initial Engine Running Time can be bypassed to allow quicker entry into closed-loop control.
Initial Engine Running Time
The amount of time the engine has been running before closed-loop control will activate. This is to allow time for the O2 sensor to reach operating temperature. It will be bypassed if the warm voltage is exceeded or the CAN Widebands are reported as being ready to use. (Default = 30)
Min Coolant Temp
Below this Coolant Temperature value the O2 Control is disabled. (Default = 0)
Min RPM
Below this RPM value the O2 Control is disabled. i.e. above this RPM, O2 control is active. This is to prevent O2 Control from making fuel changes while the engine is cranking. (Default = 450)
Max RPM
Above this RPM value the O2 Control is disabled. This allows an upper RPM limit to be set for closed loop control and is more used for narrowband sensors or for the tuner's own preference.(Default = 4500)
Transient Throttle Rate Limit
The amount of transient throttle rate above which Closed Loop Control will be disabled. This allows the O2 Control to still operate with very small rates of throttle movement, but if this amount of movement rate is exceeded the closed loop control will pause.
Enable Max TPS
When enabled, allows a maximum TPS value above which O2 Control is disabled.
Enabled Max MAP
When enabled, allows a maximum MAP value above which O2 Control is disabled.
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