Malfunction Criteria

Rich malfunction (negative)  Diagnostic value < Threshold or

Lean malfunction (positive)  Diagnostic value> Threshold Diagnostic value = "Imbalance value n" of the "Imbalanced cylinder" (n: Cylinder number (#1 or #2 or #3 or #4))

• Imbalance value n = iSTFTn - Average (other 3 iSTFTs)

  For example: Imbalance value #1 = iSTFT # 1 - (iSTFT # 2 + iSTFT # 3 + iSTFT # 4)/3.

• Imbalanced cylinder: The cylinder with maximum (ABS (Imbalance value #1, #2, #3, #4)) is selected
• iSTFT: Individual cylinder STFT (Refer to the following about the detail)