{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "In a specified operating area Y including a low engine-speed and low engine-load area, an excess air ratio » is set at a specified ratio which is two or greater and three or smaller and an ignition timing ¸ig of a spark plug 11 is set at a timing of MBT to provide the maximum torque as a normal…",
  "path": "/patents/1016339",
  "publishedAt": "2011-01-19T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D13/0234",
    "MAZDA MOTOR [JP]"
  ],
  "textContent": "In a specified operating area Y including a low engine-speed and low engine-load area, an excess air ratio » is set at a specified ratio which is two or greater and three or smaller and an ignition timing ¸ig of a spark plug 11 is set at a timing of MBT to provide the maximum torque as a normal combustion control (S4). In case a catalyst temperature Tc is lower than a predetermined first temperature T1 in this area Y, a control of retarding the ignition timing ¸ig from the MBT timing and/or a control of decreasing the excess air ratio » to a ratio below the above-described ratio are executed (S6, S8, S9). Accordingly, the temperature of the catalyst can be prevented simply and effectively from decreasing excessively, maintaining combustion conditions to provide a properly high thermal efficiency.",
  "title": "Control method of a spark-ignition engine, computer-program product and spark-ignition engine system"
}