1.3.3 Calculation of the engine roughness values luts, fluts and dluts (%DMDLFB)

The engine roughness luts (angular acceleration) for each combustion is calculated from several temporarily consecutive segment times as follows:

Fig 1: Identifying Calculation Of Engine Roughness Values Luts

Courtesy of BMW OF NORTH AMERICA, INC.

The compensation time tkomp(n) is made in the calculation for normal engine operation involving accelerations and decelerations.

dluts is calculated by subtracting of luts values staggered by 360° CS: (one revolution of the crankshaft)

Fig 2: Identifying Calculation Of Dluts

Courtesy of BMW OF NORTH AMERICA, INC.

For fluts the cylinder-individual engine roughness values luts(cyl) are filtered by means of a recursive low pass (fluts(cyl)):

Fig 3: Identifying Calculation Of Fluts

Courtesy of BMW OF NORTH AMERICA, INC.