{
  "$type": "site.standard.document",
  "description": "An engine includes an exhaust valve mechanism which opens a first exhaust valve at an earlier time point than an initial period of an exhaust stroke and opens a second exhaust valve at a later time point than the first exhaust valve at least in a first operating region R1, a first exhaust passage…",
  "path": "/patents/1401685",
  "publishedAt": "2025-03-26T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01L13/0015",
    "MAZDA MOTOR [JP]"
  ],
  "textContent": "An engine includes an exhaust valve mechanism which opens a first exhaust valve at an earlier time point than an initial period of an exhaust stroke and opens a second exhaust valve at a later time point than the first exhaust valve at least in a first operating region R1, a first exhaust passage which is connected with a first exhaust port and in which a turbine of a supercharger is arranged, a second exhaust passage which is connected with a second exhaust port and merges with the first exhaust passage while circumventing the turbine, a third exhaust passage which connects the first exhaust passage on an upstream side of the turbine with the second exhaust passage, a first switching valve which changes a channel area of the third exhaust passage, a second switching valve which changes a channel area of the second exhaust passage, and an ECU. The ECU closes the first switching valve and opens the second switching valve at least in the first operating region R1 but opens the first switching valve and closes the second switching valve at least in a second operating region R2.",
  "title": "CONTROL DEVICE FOR A SUPERCHARGED ENGINE PROVIDED WITH TWO EXHAUST VALVES PER CYLINDER"
}