{
  "$type": "site.standard.document",
  "description": "A four-stroke internal combustion engine includes: an intake passage through which air is guided to a combustion chamber; an intake valve that opens and closes communication between the combustion chamber and the intake passage; a fuel injection device through which a fuel is injected to the intake…",
  "path": "/patents/983476",
  "publishedAt": "2013-10-09T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/0002",
    "YAMAHA MOTOR CO LTD [JP]"
  ],
  "textContent": "A four-stroke internal combustion engine includes: an intake passage through which air is guided to a combustion chamber; an intake valve that opens and closes communication between the combustion chamber and the intake passage; a fuel injection device through which a fuel is injected to the intake passage; a further valve disposed in the intake passage; and a controller that controls the further valve. The controller is configured to change an opening of the further valve from an opening equal to or smaller than a first opening to a second opening greater than the first opening and from the second opening greater than the first opening to the opening equal to or smaller than the first opening during a period between the start of an intake stroke of one cycle and the end of an exhaust stroke thereof.",
  "title": "Internal combustion engine and straddle-type vehicle including the same"
}