Lambda Control Map

Lambda control map.
Th ebest possible adjustment of the air-fuel-ratio to every operating condition is achieved with a Lambda control map in the control unit.

Lambda control map is stored in the digital circuit section of the control unit.  such a map is first determined by engine-dynamometer tests., then optimized for fuel economy, exhaust emissions and driveability in the vehicle itself. With a Lambda map, it is possible to adjust the air-fuel ratio according to the following demands for every operating condition:

• minimal fuel consumption
• good driveability
• low exhaust emissions
• power. 

 it should be noted that determining a particular operating point has no influence on determining other points.  A wide-open throttle, of one ecu controls the air-fuel ratio over the entire engine-speed range to the lambda= 0.85~0.95, with avoidance of knocking as a criterion. At part load, one ecu adjusts the air-fuel ratio to provide low fuel consumption and exhaust emissions. for idling, smoothness is the top priority.  System deviations in the air-flow sensor sensor can be compensated at the points in the map where they occur, without influencing other operating points.