The AFR/Lambda Target Table is used to determine the mass of fuel to be injected for a given mass of air. It is recommended that the AFR/Lambda Target Table is correctly filled out and used in all applications.
The engine should always be tuned to match the number entered in the AFR/Lambda Target Table. This allows future changes to AFR/Lambda target without the need to re-tune the Fuel (VE) table (Requires Open Loop Lambda Correction to be turned on in Traditional mode).
The AFR/Lambda Target table is also used as the target source for some Closed Loop Lambda modes.
Note: Use of the AFR/Lambda Target Table is optional when the Fuel Equation Mode is set to Traditional but is recommended that it is always used. It is always used when Fuel Equation Mode is set to Modelled or Modelled - Multi Fuel.
Note: When the Fuel Equation Mode is set to Modelled - Multi Fuel there will be two AFR/Lambda Target Tables. AFR/Lambda Target Table 1 contains the target AFR/Lambda values for the primary fuel, while AFR/Lambda Target Table 2 contains the target AFR/Lambda values for the second fuel. The Multi Fuel Blend parameter will then interpolate between the two AFR/Lambda Target Tables to provide the correct target for the current fuel blend and engine conditions. The Multi Fuel Blend parameter is controlled by the Multi Fuel Blend Ratio Table.
Open Loop Lambda Correction
This setting is only visible in the Traditional Fuel Equation Mode.
When this setting is set to ON the Injection Effective PW is divided by the Lambda Target meaning that an engine tuned with this setting on can have the fuelling altered by changing just the Lambda target and not altering the Fuel table.
The Lambda/AFR Target Table on Multi-Throttle Engines
Link G4X ECUs have a very powerful method of tuning engines with multi-throttle or long overlap cams. This tuning is based on both TPS and Manifold pressure. The Fuel Table Y axis is based on TPS, the Lambda/AFR Target Tables Y Axis is MAP or MGP. The Target is used as a look up table for manifold pressure changes. Based on the values in the Target Table, the ECU makes corrections for manifold changes in the fuel equation to adjust injector time. The Fuel Table is tuned based on TPS and the ECU automatically looks after the changes in manifold pressure. Another advantage of this method, is that the Target Lambda/AFR of the engine can be later changed without needing to retune the Fuel Table.
The settings required are,
·Equation Load Source: Load= MAP
·Open Loop Lambda Correction: ON
·AFR/Lambda Target Table Y Axis: MAP or MGP
·Fuel table Y axis: TP(Main)
Refer to the following topics related to the AFR/Lambda Target Table