ALM-BR4-4.3 Manual
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Copyrights ECOTRONS LLC www.ecotrons.com
ALM Product Overview
ALM (Accurate Lambda Meter) is an air-fuel-ratio (AFR) meter that uses the Bosch LSU
4.9 wideband oxygen sensor and Bosch semiconductor chip CJ125 to accurately
measure the AFR or lambda for variant combustion engines.
ALM-Board is a version of ALM that trims off the peripheral parts and keeps the
minimum set of electronics yet providing the core function of the wideband controller. It
is a mini-size board, 70.5mm*32mm*28mm, and it can be plugged into the main
controller board easily. The only thing that it needs from the mainboard is 12V power
supply. ALM-Board has the full control function for LSU 4.9 sensor. Same as our other
ALMs, it has a CJ125 chip built-in. It measures the O2 concentration accurately, and
converts it to either lambda or AFR, as you want. It controls the sensor temperature in a
close loop mode, accurately around 780
o
C degrees. ALM-Board communicates using
RS485.
ALM-Board is designed to fit into the OEM's controller case with a very small footprint. It
has its own LSU 4.9/ADV sensor connector and cable. It can be connected to the
mainboard via a mini connector. Or you can request a customized connection between
the ALM-Board and your mainboard. We do customization for small manufacturers.
All our ALMs have high accuracy and fast response characteristics, which are the root of
our design at the very beginning.
First, ALM uses the LSU 4.9 wideband sensor. And it can also use the LSU ADV sensor
by changing the configuration in the ALM GUI software.
Second, Bosch CJ125 chip is the integrated chip (IC) specifically designed for LSU 4.9
sensors. Bosch's own wideband controller, "Lambda Tronic", uses the CJ125 driver chip.
Essentially, Bosch uses this chip wherever an LSU sensor is used. The CJ125 and LSU
sensors are mated-pair by Bosch. Presumably, LSU sensors work the best with CJ125
chips.
Together, LSU 4.9 and CJ125 make our ALM a more accurate lambda meter in the
automotive market.
