immediately correct the multiplier characteristic when we see that collected green points do not
agree with the gasoline map. It is even strongly recommended, because if the multiplier
characteristic differs strongly from the required one, the controller starts to switch over and – in the
extreme case – can activate the signalling lamp “check”. During current correction of the multiplier
characteristic the points of the LPG map should agree with the gasoline map. If we manage to agree
both maps, we can affirm that the characteristic is properly selected.
3.4. Check if maps agree; verification of deviations.
Having collected the gasoline and the LPG maps (both maps drawn with continuous lines)
we can check the deviation between the gasoline and the LPG maps. In the window Map there is
the button “Deviation” situated on the right. When pressed, appears the deviation graph drawn with
red line. If the deviation fits the range ± 10%, we can assume that the controller is programmed
correctly; otherwise the multiplier characteristic should be corrected in points, where maps do not
agree.
3.5. Manual setting of the controller.
The controller can be also set manually; this type setting – if performed with proper skill –
can last shorter than the method described above. We start the setting of the controller – as for the
previous method – with autocalibration (it is indispensable for correct operation of the controller,
see 3.1). Then, if the auto-calibration has been finished successfully and multiplier values for the
calibration point are correct, we switch over the vehicle to gasoline and drive it for the test. The
setting of the multiplier characteristic should be performed as follows:
We drive the vehicle using gasoline, we make efforts to keep the constant engine load i.e.
gasoline injection times should be stable. We match the load so that the gasoline injection time was
e.g. ca. 5 [ms]. Evaluation of gasoline injection times will be easier with help of the blue marker,
which vertical position at the horizontal axis depends on injection time. Now we switch over the
vehicle to LPG and watch, if the blue marker will not change its position at the injection time axis
i.e. the gasoline injection time has not changed. If the gasoline injection time became shorter (the
marker has shifted to the left), this means that for given gasoline injection times the multiplier is to
high (the mixture is too rich). In such case correct the multiplier – in our case for the time 5 [ms] -
downwards. If after switchover from gasoline to LPG the marker goes to the right, this means that
the mixture is too weak and the multiplier map should be shifted upwards for given injection times.
The procedure described above should be performed for a few injection times beginning from the
calibration point as far as to injection times for great load. We can check the multiplier map e.g.
every 2 [ms] beginning from the calibration point. If necessary, we can add a point at the multiplier
map to set it more precisely.
After execution of described manual setting both maps – gasoline and LPG – should agree.
4. Operation of the LED switchboard and acoustic signals (user
manual)
4.1. LED switchboard
The LED switchboard consists of:
• The LED line indicating the LPG level
• The LED indicating the fuel type
• Push button
LED line – displays current LPG level in the tank after switchover to LPG. Four green LEDs mean
that the tank is full, the red one means reserve.
LED – shows current operational mode:
• Off – the vehicle uses gasoline
• Slow blinking (once a second) – waiting for the engine temperature
• Normal blinking (twice a second) – the controller in the auto mode (waiting for rpm
required for switchover to LPG)
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