1.1.3 Validation of the Calculated Sensor Signals

1. monitoring two cross criteria (calculated sensor signal has to cross the mean value characteristic curve twice)
2. monitoring delta threshold for minimum and maximum of trim control set-point (O2_CAT is a calculated value, using rear O2S signal as a basis)
3. mean value difference of the calculated sensor signals related from one period to the next one [(O2_CAT_MVn) -(O2_CAT_MVn-1)]

Fig 1: OBD Demo FTP 75 Graph

Courtesy of BMW OF NORTH AMERICA, INC.