1.3.4 Determination of the engine roughness correction value (%DMDFON)

The adaptation during firing operation (fuel-on adaptation) compares the calculated engine roughness luts of the individual cylinders and learns systematic deviations. These are stored in a speed- and load dependent map.

Fig 1: Adaptation During Firing Operation Diagram (Fuel-On Adaptation)

Courtesy of BMW OF NORTH AMERICA, INC.