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Engine knock detection for a multifuel engine using engine block vibration with statistical approach.

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Summary
This summary is machine-generated.

Detecting engine knock in Diesel-CNG dual-fuel engines is crucial for performance and longevity. This study introduces a vibration-based method using a single sensor to quantify and visualize knock events, preventing engine damage.

Keywords:
Diesel-CNG dual fuelEngine knock phenomenaKnock detection method

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Area of Science:

  • Combustion Engineering
  • Mechanical Vibrations
  • Alternative Fuels

Background:

  • Engine knock hinders optimal Compressed Natural Gas (CNG) utilization in Diesel-CNG dual-fuel engines, potentially causing severe damage.
  • Low-intensity knock is difficult to detect due to engine noise and random occurrences, leading to improper tuning and unnoticeable damage.
  • Existing methods struggle to detect knock in combustion analysis or visual data due to its unpredictable nature.

Purpose of the Study:

  • To develop a reliable method for quantifying engine knock occurrence in Diesel-CNG dual-fuel engines.
  • To address the knowledge gap in knock detection for multifuel engines, enabling proactive avoidance strategies.
  • To provide a technique for indexing knock intensity and visualizing knock phenomena.

Main Methods:

  • Utilized engine block vibration analysis with a single piezoelectric knock sensor.
  • Developed a knock index calculation based on vibration signals.
  • Determined the knock threshold using statistical three-sigma rule analysis for accurate detection.

Main Results:

  • Successfully quantified knock occurrence by comparing the calculated knock index with the statistically determined threshold.
  • Demonstrated the capability to index knock intensity.
  • Enabled visualization of knock phenomena across consecutive and individual engine cycles.

Conclusions:

  • The proposed vibration-based method offers an effective alternative for detecting engine knock in Diesel-CNG engines.
  • The statistical three-sigma rule provides a robust approach for setting knock thresholds.
  • This technique enhances engine management by enabling clear visualization and detection of knock events.