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3.2. Collection of the petrol injection map with petrol (petrol map)
Having finished the auto-calibration, switch over to petrol and drive the vehicle for app. 4 km to collect
the petrol map. During the collection of the map try to drive without changing gears e.g. at the 4th gear
and in a way making the lambda probe to “work” i.e. changing its mode from weak to rich. Blue points
should appear during the collection of the map. To collect the map quicker, adjust vehicle load in such
a way causing new points to be collected in places which are still empty.
Collection of maps is
performed without participation of the diagnostic software, thus can be done with the PC
disconnected.
However, collecting the map while the PC is connected and the diagnostic software
running is quicker and enables the operator to see what is actually happening to the vehicle. When the
controller collects sufficient number of points, the map will be drawn with a continuous line and the
petrol map collection is finished.
3.3. Collection of the petrol injection map with LPG (LPG map)
Having collected the petrol map, switch to LPG and collect the LPG map in the same way the petrol
map was collected. The LPG map should be collected in the same road conditions and with similar
loads as the petrol map. The LPG map is drawn with green points. Having collected sufficient number
of green points, the map will be drawn with a continuous green line. If the controller is set properly (the
multiplier characteristics selected properly), the petrol and the LPG maps should match. If the maps do
not match, the multiplier characteristic should be corrected at the points where the maps do not match
(the lower axis of co-ordinates for injection times). If the LPG map is collected with the PC connected
and the diagnostic software running, it is possible to immediately correct the multiplier characteristics
when the collected green points do not match with the petrol map. It is even strongly recommended to
use the PC in this way as if the multiplier characteristics differ strongly from the required ones, the
controller starts to switch over and
– in the extreme case – can activate the “check” signal lamp. When
correcting the multiplier characteristics, make the points on the LPG map match with the petrol map.
Once both maps match, the characteristics are properly set.
3.4. Checking if maps match, verification of deviations
Having collected the petrol and LPG maps (both maps drawn with continuous lines) check the
deviation between them. In the
Map
window there is the “D” button located on the right. Press it to see
the deviation graph drawn with a red line. If the deviation fits within ± 10%, the controller is
programmed properly; otherwise, the multiplier characteristics should be corrected at points where
maps do not match.
3.5. Controller manual setting
The controller may also be set up manually, which
– provided sufficient experience has been gained –
may prove quicker than the above described procedure.
Start with the auto-calibration in the same way as described above (this is necessary to ensure the
controller works properly, see 3.1). If the auto-calibration finishes properly and the multiplier values
are correct for the calibration point, switch the engine to petrol and take it for a ride. The multiplier
characteristics need to be set in the following way:
Drive the car with a constant load, i.e. the petrol injection times should be stable. Adjust the engine
loads so that the injection times equal e.g. app. 5 [ms]. The blue marker will help determine the
injection times as it is location on the horizontal axis is determined by the injection times. Next, switch
the car to LPG and watch the blue marker for variations in injection times when compared with the
earlier petrol injection times. If the injection times decreased (the marker moved to the left) it means