Note: Refer HERE for a detailed explanation of Closed Loop Lambda settings.
Closed Loop Lambda
Closed Loop Lambda (CLL) is designed to provide automatic trimming of fuel mixtures, this is useful for reducing emissions and can be necessary for proper catalytic converter operation. Link G4X ECUs allow the use of Wide Band or Narrow Band exhaust oxygen sensors and can do trim all cylinders equally or can trim two groups (usually different banks) independently.
To use CLL at least one narrow band oxygen sensor or wideband oxygen sensor controller must be correctly wired to an Analog Voltage Input or connected via CAN. Narrowband Sensors must be set up in the Closed Loop Lambda window with the Lambda Mode set to 'Stoich Mode (Narrow Band)', Wideband Sensors must be setup using the Lambda 1 and Lambda 2 settings in the Analog Inputs section of the settings menu. More wideband sensors can be connected via CAN but will only affect CLL if the Number of Banks is set to 1. If a heated narrow band oxygen sensor is used, its heater can be controlled by the ECU using a General Purpose Output or General Purpose PWM Output in the Auxiliary Output section of the settings menu.
Warning: CLL is designed to be used to apply a minor trim while the vehicle is being driven, it is not intended as a tuning aid. Assisted fuel tuning can be done using the Quick Tune function.
Single Bank Control Sensor Location
In single bank mode fuel to all cylinders is trimmed by the same amount. If using a Narrow Band oxygen sensor, it must be installed in a location where it can measure the mixed exhaust gas from all cylinders (only a single sensor is used). If using Wide Band oxygen sensors then up to 8 can be installed and the average Lambda value of all connected Lambda sensors will be used to calculate the correction.
Dual Bank Control Sensor Locations
When Number of Banks is set to 2, two groups of cylinders can be controlled independently. Use of this mode requires that two separate sensors must be installed such that each sensor measures exhaust gases from its own distinct group of cylinders. For example on a V8 engine one sensor will be in each exhaust manifold so that each sensor only gets the exhaust gas from it's group of cylinders.
·When using Lambda Mode Stoich Mode (Narrow Band) the first group of cylinders (Bank 1) is controlled by NB Oxy Source and the second group of cylinders (Bank 2) is controlled from NB Oxy Source 2.
·When using a Wide Band mode the first group of cylinders (Bank 1) is controlled by the selected Bank 1 Source and the second group of cylinders (Bank 2) is controlled by the selected Bank 2 Source.
Dual Channel Mode uses the same set of lockouts for both channels but completely independent control of mixture measurement and correction.
Note: When using Dual Bank Control the fuel is added on a per injector basis, this means that if using sequential injection then the cylinder number matches the injector number but if using a non sequential mode such as multi point group then the 'Cylinder X' setting actually refers to the injector drive with the same number.
Refer to Closed Loop Lambda Settings for information on what each setting does.
Refer to Closed Loop Lambda Runtimes for more information on the Closed Loop Lambda Runtime Values and Statuses