{
  "$type": "site.standard.document",
  "description": "Data on an in-cylinder pressure (CP) resulting from pilot injection are extracted based on in-cylinder pressure data (Dcp) (S12), and are subjected to Fourier transform to be thereby converted into data indicating a relationship between a frequency and a sound pressure level (S14). Subsequently…",
  "path": "/patents/933545",
  "publishedAt": "2016-12-14T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D35/023",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "Data on an in-cylinder pressure (CP) resulting from pilot injection are extracted based on in-cylinder pressure data (Dcp) (S12), and are subjected to Fourier transform to be thereby converted into data indicating a relationship between a frequency and a sound pressure level (S14). Subsequently, the converted data are subjected to bandpass filter processes for a plurality of frequencies respectively (S16). When the sound level at each of the frequencies exceeds a threshold (Th1, Th2, Th3...) provided for each of the frequencies, an amount of excess over the threshold is calculated (S18). Then, a combustion noise correction amount (”Qpcs) is calculated based on the amount of excess (S22).",
  "title": "COMBUSTION NOISE SUPPRESSION CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE"
}