{
  "$type": "site.standard.document",
  "description": "An intake control apparatus is configured to control a variable valve operating mechanism (2) and an opening degree of a throttle valve (18). The variable valve operating mechanism (2) varies the valve lift characteristic of the intake valves (3) to control the intake air amount into the cylinders…",
  "path": "/patents/1086198",
  "publishedAt": "2004-06-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01L1/022",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "An intake control apparatus is configured to control a variable valve operating mechanism (2) and an opening degree of a throttle valve (18). The variable valve operating mechanism (2) varies the valve lift characteristic of the intake valves (3) to control the intake air amount into the cylinders of the engine. The throttle valve (18) produces a negative pressure inside the collector (16), but in a valve control region including medium loads, the pressure inside the collector (16) is fixed at a weak negative pressure and the intake air amount is controlled by varying the valve lift characteristic of the intake valves (3). In an internal EGR priority region of low loads, the negative pressure is strengthened somewhat and the lift/duration of the intake valves (3) is increased. When the engine (1) is cold, the negative pressure is adjusted to be close to atmospheric pressure and the lift/duration of the intake valves (3) is reduced.",
  "title": "Intake control apparatus for internal combustion engine"
}