{
  "$type": "site.standard.document",
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  "description": "An electric vehicle includes an inverter unit (22). The inverter unit (22) includes a torque fluctuation estimator (37) configured to estimate, according to a predefined rule, a torque fluctuation that is inclusive of fluctuations in torque attributable to a wheel bearing unit (4), a motor unit (6)…",
  "path": "/patents/980261",
  "publishedAt": "2014-01-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60K17/046",
    "NTN TOYO BEARING CO LTD [JP]"
  ],
  "textContent": "An electric vehicle includes an inverter unit (22). The inverter unit (22) includes a torque fluctuation estimator (37) configured to estimate, according to a predefined rule, a torque fluctuation that is inclusive of fluctuations in torque attributable to a wheel bearing unit (4), a motor unit (6) or a reducer unit (7), based on (i) a fluctuation in a rotational frequency as determined with a rotation sensor (24) configured to sense a rotational frequency of a wheel or with an angle sensor (36) for the motor unit (6), (ii) a fluctuation in a load acting, between a road surface and a tire, along a direction in which the vehicle travels, as determined with a load sensor (41), or (iii) a fluctuation in a motor current.",
  "title": "ELECTRIC AUTOMOBILE"
}