An Advanced Engine Knock Detection Module Performs Higher Accurate Mbt Control And Fuel Consumption Improvement

When knock occurs in an engine, vibrations composed of several specific resonant frequencies occur. Some of these resonant frequencies are missed stochastically because specific resonant frequencies are caused by different resonant vibration modes in a combustion cylinder. This paper presents a multi-spectrum method which greatly improves knock detection accuracy by detecting the knock resonance frequencies. The developed knock detection module makes knock control possible throughout the entire engine speed for each engine cylinder. The experimental results show that sensitive knock detection and effective knock reduction control are obtained using the multi-spectrum method.