AiM LCU-2-CAN

The LCU-2 CAN lambda measurement system was primarily developed for use in conjunction with AIM displays and data loggers. In the CAN network with the MXL you can operate up to 12 LCUs at the same time. LCU-2 can also be used on engines that are not operated with gasoline, but with methanol, gas, diesel, etc., because RaceStudio2 also allows the Lambda 1 parameters to be changed.

 LCU-2 is a control unit for the BOSCH LSU 4.9 broadband lambda probe. Its task is to control and monitor the correct functioning of the lambda probe and its heating and to digitally output the lambda value determined from the residual oxygen content of the exhaust gas via CAN.

 The optimal air-fuel ratio (AFR) for Otto engines, the so-called stoichiometric ratio, is approx. 14.7. This means that if 1 kg of gasoline is mixed homogeneously with 14.7 kg of air (approx. 11 m³), its combustion results in the fewest pollutants in the exhaust gas, because the chemical connection of the carbon-hydrogen molecules (HC) available in it with the corresponding oxygen molecules (O2) fits the air perfectly. One speaks of a lambda = 1 mixture. If AFR> 14.7 one speaks of a lean mixture and if it is less than 14.7, of a rich mixture. In gasoline engines, an AFR value between 12.8 and 13.4, i.e. lambda 0.88 and lambda 0.92, is aimed for at full load, not only because it achieves the highest output, but also to protect it from overheating. LCU-2 measures the lambda value in the exhaust gas between 0.65 and pure air.

 In communication via the CAN bus (MXL Pista, MXL Pro, MyChron 4), it provides information about the lambda value, AFR, probe temperature and the self-diagnostic parameters. All measured values are then displayed and recorded by the respective master.