{
  "$type": "site.standard.document",
  "description": "A cost required to perform the diagnosis of the degradation such as a reduction in output power of an engine while engine degradation diagnosis accuracy is improved. To this end, a controller (engine diagnosing device) determines whether a hydraulic pump is in a preset loaded state (an operation…",
  "path": "/patents/1301171",
  "publishedAt": "2021-09-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "E02F9/267",
    "HITACHI CONSTRUCTION MACHINERY CO., LTD."
  ],
  "textContent": "A cost required to perform the diagnosis of the degradation such as a reduction in output power of an engine while engine degradation diagnosis accuracy is improved. To this end, a controller (engine diagnosing device) determines whether a hydraulic pump is in a preset loaded state (an operation scene where a load torque of the hydraulic pump is in a stable state) for acquiring diagnosis data of an engine , and validates a controlled variable related to a torque command value Ta of speed sensing control as the diagnosis data of the engine when it is determined that the hydraulic pump is in the present loaded state, generates time history data using this validated controlled variable as a current feature variable, and enables this time history data to be displayed as trend data for engine diagnosis on a display device",
  "title": "CONSTRUCTION MACHINE"
}