{
  "$type": "site.standard.document",
  "description": "The detection appatatus includes means for detecting rotation speed information of the respective wheels of a vehicle; means for estimating, a frequency characteristic of the wheel rotation speed information; and means for determining, based on the estimated frequency characteristic, a tire having…",
  "path": "/patents/1013051",
  "publishedAt": "2011-05-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C23/061",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "The detection appatatus includes means for detecting rotation speed information of the respective wheels of a vehicle; means for estimating, a frequency characteristic of the wheel rotation speed information; and means for determining, based on the estimated frequency characteristic, a tire having a decreased air pressure. The frequency characteristic estimate means includes, to a time-series signal including the wheel rotation speed information: means for time-series estimating a third order or more linear model parameter; means for generating pseudo input data; means for estimating, based on the estimated linear model parameter and the pseudo input data, output data to a linear model; means for identifying, based on the pseudo input data and the estimated output, a linear model parameter for which the order is reduced to a second order; and means for estimating, based on the identified parameter for which the order is reduced to the second order, a resonance frequency of a tire torsional direction. The decreased air pressure determination means is so configured as to determine a tire having a decreased air pressure based on the estimated resonance frequency of the tire torsional direction.",
  "title": "Apparatus and method for detecting tire having decreased pressure, and program for detecting tire having decreased pressure"
}