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Air-Fuel Ratio Modules ECM offers four
high-quality AFR modules suitable for applications where a display is not
required. Modules AFM1500 and F/A1500 output AFR (or FAR) via a 0 to 5V
linearized analog signal and AFR, FAR, Lambda, and %O2 via a SMB (Serial
Measurement Bus) interface. The SMB interface allows serial communication
with as many as sixteen modules using a single RS-232 type serial port from
a computer. Modules AFM1000 and F/A1000 output AFR (or FAR) via a 0 to 5V
linearized analog signal. All four modules measure AFR using UEGO (Universal
Exhaust Gas Oxygen) sensors. The UEGO sensor has revolutionized AFR
measurement because of its wide range, fast response, and ease-of-use. The
sensor consists of a spark plug-sized electrochemical cell which is placed
directly in the engine's exhaust. The cell responds to O2, CO, H2, and UHCs
in the exhaust to determine AFR and FAR (inverse of AFR) for fuels of any
composition. All four of ECM's AFR modules can perform field calibration of
the sensor using ambient air.
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