AiM LCU-One CAN for MyChron4 - Manual (Page 3)

LCU-ONE CAN connected to MyChron4
User Manual
Release 1.04
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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 MyChron4 with lambda values through the CAN bus.
Lambda value is defined as: LAMBDA= (A/F)/(A /F) Stoichiometric
where:
A = incoming parts of air;
F = parts of petrol the carburettor introduces in the engine;
A/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.
Wide band Lambda probes need to be heated to work properly and not poison with
exhaust gas; LCU-ONE controller precisely manages the probe heater so to keep
temperature value in the optimum working range.
Lambda probe used with LCU-ONE controller becomes very hot (around 700-800 °C,
1292-1472 °F) during its working period, it is thereby necessary AVOIDING:
• touching it.
• placing it in contact with inflammable stuff or fuel.
Please note:
disrespect of these precautions can cause shocks, burnings or explosions.
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1.1 – Part Numbers
LCU-ONE CAN part numbers are:
• Controller LCU-ONE (Complete kit with Lambda probe)
X08LCU03K0;
• BOSCH LSU 4.9 Lambda probe
X05LSU490.
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