AiM LCU-One CAN for MyChron4 660 - Manual (Page 3)

LCU-ONE CAN connected to MyChron4 660
User Manual
Release 1.04
www.aim-sportline.com
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Chapter 1 – LCU–ONE
LCU-ONE is a lambda controller unit for the 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 660 with lambda values through the CAN bus.
Lambda value is defined as: LAMBDA =(A/F)/(A/F) Stoichiometric
Where:
A = incoming part of air;
F = parts of petrol the carburetor injects into 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 from 0.65 to 1.6 (free air).
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 poisoned with
exhaust gas; LCU-ONE controller precisely manages the probe heater so to keep
temperature value within 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 flammable stuff or fuel.
Please note:
disrespect of these precautions can use cause shocks, burnings or explosions.
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1.1 – Part Number
LCU-ONE kits part numbers are:
• Controller LCU-ONE (Complete kit with Lambda probe)
X08LCU03K0;
• BOSH LSU 4.9 Lambda probe
XO5LSU490.