AiM LCU-One CAN + Analog ver 1.05 - Manual (Page 3)

LCU ONE-CAN+Analog
User manual
Release 1.05
www.aim-sportline.com 2
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1 – LCU-ONE CAN + Analog description
LCU-ONE CAN+Analog
(from here onward LCU-ONE) is a lambda controller for wide
band BOSCH LSU 4.9 lambda probe. It fits petrol and diesel engines as well as alcohol
based fuel engines. It is intended to check lambda probe proper working as well as to
transmit Air/Fuel Ratio values or Lambda values both through the CAN bus or through a
serial RS232 bus.
Lambda value is defined as the ratio between instant AFR and Stoichiometric
AFR, to say:
LAMBDA = (A/F)/(A/F) Stoichiometric
where:
A = incoming part of air;
F = parts of petrol the carburetor injects into the engine;
A Stoichiometric / F Stoichiometric
= parts of air needed to burn Stoichiometric F;
For gasoline i.e. it needs 14,57 parts of air to completely burn a part of gasoline,
obtaining Lambda value=1 read by the probe.
LCU-ONE controller can detect lambda values in a range of 0.65 to 1.6 (free air).
It is reminded that a lambda value lower than 1 means a rich mixture while a
lambda value higher than 1 means a lean mixture.
Wide band Lambda probe needs to be heated to work properly and not being poisoned
with exhausted gas; LCU-ONE precisely manages the probe heater so to keep
temperature values in the optimum working range.
If using the CAN bus, LCU-ONE supplies information about the probe temperature and
a diagnostic highlighting improper functioning situations of the same probe (probe not
connected, GND short circuit, power short circuit).
Lambda value is supplied through a 0-5 Volts analog output configurable through
Lambda Configurator
, the software properly developed by AIM to configure its analog
controllers.
On the other hand Lambda/AFR value, as well as probe temperature and diagnostics,
comes through the CAN bus.
Lambda probe used with LCU-ONE becomes very hot (around 700-800 °C, 1291-
1472 °F); it is thereby necessary
AVOIDING :
touching it
placing it in contact with flammable stuff or fuel.
Warning:
disrespect of those precautions, can cause shocks, burnings or explosions.