{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
    "ref": {
      "$link": "bafkreic2rvkjg27nw7osvrpbb66ye3eryd6ngwnzkchijmjlcundhibm3i"
    },
    "mimeType": "image/png",
    "size": 112019
  },
  "description": "A method for determining the rotation speed of at least one supercharger which compresses the sucked air in an internal combustion engine (1); the control method, during the normal operation of the internal combustion engine (1), comprises the steps of detecting, by means of a microphone (25), the…",
  "path": "/patents/1007369",
  "publishedAt": "2011-12-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02B29/0418",
    "MAGNETI MARELLI SPA [IT]"
  ],
  "textContent": "A method for determining the rotation speed of at least one supercharger which compresses the sucked air in an internal combustion engine (1); the control method, during the normal operation of the internal combustion engine (1), comprises the steps of detecting, by means of a microphone (25), the intensity of a sound signal generated by the rotation of the supercharger (14); determining a frequency content of the sound signal generated by the rotation of the supercharger (14); identifying the frequencies with maximum amplitude within the frequency content of the sound signal generated by the rotation of the supercharger (14); recognising the frequencies with maximum amplitude which are each other's multiples or submultiples; and determining the rotation speed of the supercharger (14) using exclusively the frequencies with maximum amplitude which are each other's multiples or submultiples.",
  "title": "Method for determining the rotation speed of a supercharger in an internal combustion engine"
}