SHIM PACK 8S6262 - Caterpillar

This section provides a detailed description on how to analyze the detonation sensor signal.Detonation Signals
Detonation in a cylinder will occur 5 mS to 10 mS after that cylinder fires on G3600 engines at 900 or 1000 rpm. This time is called the detonation window. The detonation signals strength will generally be different from one firing to the next.The signal frequency will be between 2 and 4 kHz on G3600 engines. A typical signal containing detonation is displayed in Figure 5.Detonation is measured as the largest signal strength divided by the smallest signal strength (background noise) on the detonation signal. The larger the amplitude of the signal, the more severe the detonation. Figure 5 shows an example of a cylinder detonating. The amplitude of the signal during detonation is much larger than the background noise.
Figure 5 Detonation Sensor output signal containing actual detonation - top trace Combustion Buffer output signal - bottom trace