Owner manual

LCU-ONE CAN connected to MyChron4

User Manual

Release 1.04

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.

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.