The Autotune function is a tool used for analyzing gathered log data and help to build VE table.
The process consists from the 3 main steps:
1) Gathering data
2) Processing data
3) Analyzing data and apply VE changes
1. Gathering data
Gathering data is the most important part of the whole process. It is important to keep the engine in steady state in as many load / rpm setpoints. Any data gathered during transient condition (eg. acceleration) will be ignored.
For data collecting the engine coolant should be at normal operating temperature. It is allowed to use EGO correction. Collect data using different gears and different throttle position. The goal is to cover as big VE table area as possible. It is very important to build Lambda/AFR target table before you start the autotune.
2. Processing data
To process data it is important that calibration used for data logging is loaded (or EMU with calibration is connected), and proper datalog is present. The next step is to open Autotune tool (Menu / Tools / Autotune).
Min./ Max. RPM - The RPM range for valid data samples
Min./ Max. TPS -The TPS range for valid data samples
Min./ Max. MAP - The MAP range for valid data samples
Transients delay - The time after transient condition (fuel resume, acc/decc enrich) during all collected data will be ignored
VE table number - The table that will be modified. It is important that this table must be the same as a table used during data collecting
After pressing OK button, the data is processed and autotune window will appear. This window is also accessible from the left tree view (Log / Autotune).
3. Analyzing data and apply VE changes
The last step is data analyzing and applying VE changes. The base view is proposed VE table. All cells that are calculated from log are clear, cells that are not calculated are masked (hatched). If you select any cells on Autotune table the corresponding cells on VE and Lambda tables will be also selected.
The table proposed VE shows us the proposed VE values that was calculated based on the log, VE table and Lambda/AFR target table. To apply the changes from selceted cells to the VE table, show context menu (right mouse button) and select Apply selection 100% or Apply selection 50%. Alternatively you can press S button to apply selection 100% and ALT+S buttons to apply selection 50%. Apply 100% means that proposed VE values will be copied to VE table, apply 50% means that the average value of VE table and proposed VE table will be used.
The view Actual Lambda/AFR shows us the measured Lambda/AFR during the data collecting.
The view Number of collected samples shows us how many data samples was used for calculating proposed VE table. The more samples the better proposed VE values.
The view Actual Lambda/AFR difference shows us the difference between Lambda/AFR target and the measured Lambda/AFR. The bigger difference, the bigger VE change is required.
The view Actual VE difference shows us the difference between proposed VE values and current VE table.
Step by step autotune procedure
1. Prepare VE table that allows the engine running and assure that in high engine load the mixture is rich
2. Prepare Lambda/AFR target
3. Drive the car under different load / RPM conditions.
4. Run autotune tool
5. Apply changes in desired VE cells
6. Correct unmodified (not visited during test drive) VE table cells manually to fit them to autone ones. You can use Equalize function (E button on selected cells)
7. Clear the log
8. Repeat the procedure from point 3
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