Knock

{
  "id": "MLC-T-IND-003202",
  "term": "Knock",
  "field": "Industrial and trades",
  "definition": "An audible pinging or rattling sound from an internal combustion engine caused by detonation, which is the uncontrolled, premature ignition of the air-fuel mixture in a cylinder. This secondary flame front collides with the one initiated by the spark plug, creating a sharp pressure wave. Modern engines use knock sensors to detect this vibration and signal the engine control unit to retard ignition timing.",
  "subject": "Automotive",
  "see_also": [
    "knockstone"
  ],
  "translations": {
    "de": "Klopfen",
    "es": "golpeteo",
    "fr": "cliquetis"
  },
  "url": "https://mlchart.com/terminology/industrial/knock/"
}