{
  "$type": "site.standard.document",
  "description": "A detection apparatus (30) estimates and detects an alcohol concentration of a fuel based on an output signal of a pulser rotor (50) to eliminate the necessity for a sensor for detecting an intake air mass. A first crank angular speed (É1) within a first predetermined interval (Ä1) overlapping with…",
  "path": "/patents/1010274",
  "publishedAt": "2011-08-10T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D19/084",
    "HONDA MOTOR CO LTD [JP]"
  ],
  "textContent": "A detection apparatus (30) estimates and detects an alcohol concentration of a fuel based on an output signal of a pulser rotor (50) to eliminate the necessity for a sensor for detecting an intake air mass. A first crank angular speed (É1) within a first predetermined interval (Ä1) overlapping with the compression top dead center is calculated, and a first variation amount (”É1) is calculated by subtracting the first crank angular speed (É1) from an average engine speed (NeA). Further, a second crank angular speed (É2) within a second predetermined interval (Ä2) overlapping with the combustion bottom dead center is calculated, and the first crank angular speed (É1) is subtracted from the second crank angular speed (É2) to calculate a second variation amount (”É 2). In a relationship between A/F and IMEP/·c when the engine is operated with a predetermined fuel injection map from among a plurality of graphs each indicating a relationship between A/F and IMEP /·c for each desired alcohol concentration, IMEP/·c is substituted by ”É2/”É1to estimate an alcohol concentration.",
  "title": "Alcohol concentration estimation and detection apparatus"
}