AiM LCU-One CAN for MXL/EVO3 - Manual (Page 3)

LCU-ONE CAN connected to MXL and EVO3
User Manual
Release 1.05
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Chapter 1 – LCU-ONE
LCU-ONE is a lambda controller unit for wide band BOSCH LSU 4.9 lambda probe. It
fits petrol (2 and 4 strokes), diesel and methane engines as well as alcohol based fuel
engines. It is intended to check lambda probe proper working as well as to transmit the
Air/Fuel Ratio values providing MXL/EVO3 with lambda values through the CAN bus.
Lambda value is defined as: LAMBDA= (A/F)/(A Stoichiometric /F Stoichiometric)
where:
A
= incoming parts of air;
F = parts of petrol the carburettor injects into the engine;
A Stoichiometric / F Stoichiometric = parts of air needed to burn Stoichiometric F;
Speaking about gasoline, for example, 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 LAMBDA value lower than 1 means a rich mixture, while
LAMBDA value higher than 1 means a lean mixture.
It is necessary to heat the wide band Lambda probe so that it works properly and is not
poisoned with exhaust gas. LCU-ONE precisely manages the probe heater so to keep
temperature value in the optimum working range.
Warning: during its working period, Lambda probe used with LCU-ONE becomes
very hot (around 700-800 °C that is 1292-1472 °F); it is thereby necessary
AVOIDING:
• touching it.
• placing it in contact with flammable stuff or fuel.
Warning:
disrespect of these precautions can cause shocks, burnings or explosions.
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1.1 – LCU ONE part number
LCU-ONE Kits part numbers are:
• Controller LCU-ONE (complete kit with Lambda probe) X08LCU03K0
• Lambda probe BOSCH LSU 4.9
X05LSU490
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