manuale per l'installatore - 1/3 tipologie d'installazione - 2/3 software ...

4.2.1.6 Oxygen Sensor
Calibration
It is the fifth step for LPG installation
and the sixth one for CNG
(see picture 4.1).
The Oxygen sensor calibration
is very important for this system as
this signal is used to speed up and
optimize the self-learning strategy.
It is important to know some
oxygen sensor characteristics such
as if it is a “CURRENT” or a “VOLT-
AGE” one (ordinary oxygen sensor),
if it is “straight” or “reverse”.
Let’s explain the meaning:
• Straight Oxygen sensor: the
high tension level corresponds
to a “rich” situation of the mixture
and, on the contrary, the
low tension level to a “lean” situation
of the mixture.
• Reverse Oxygen sensor: the
opposite of Straight one.
Note: usually if the oxygen sensor
is a current type, it is a reverse
one, too.
Identification method: with a
sharp acceleration and standing
still, execute a cut- off (released
condition where there is no injection);
if the oxygen sensor is low it
is a Straight one otherwise it is a
Reverse one.
The Current oxygen sensor is
recognisable for its extremely different
behaviour compared to the
Voltage oxygen sensor one.
During stationary conditions (at
idle) when the vehicle is in control,
a voltage oxygen sensor continuously
varies between minimum and
maximum tension value while a
current one will keep practically the
same value.
Pic. 4.16 - Aided Procedure – Oxygen sensor calibration
Pic. 4.17 - Aided Procedure – Oxygen sensor calibration clicking on Forward
Only executing sharp tip-in or
during an open-loop phase, this
value notably changes. Please
remember current oxygen sensors
are mainly used by some car manufacturers
(i.e. Volkswagen) and
the mostly have more that 4 cables.
Once these parameters are set
and verified, continue the oxygen
sensor signal calibration. With the
engine at about 3000 rpm wait till
oxygen sensor start to check (see
picture 4.16) them click on Next
(not the one at the bottom of the
22
screen or you will directly go to the
next step) and start the automatic
calibration procedure. Keep the
engine at 3000 rpm and wait till the
program acquires the oxygen sensor
working range (see picture
4.17).
The calibration could be repeated,
in case of mistakes, by clicking
Calibration, executing again all the
above listed operations.
At the end click on Next again
and confirm the acquired data.