{
  "$type": "site.standard.document",
  "description": "A method is disclosed for detecting misfire or partial burn and for controlling spark retard in the cylinders of an internal combustion engine operated under the control of a microprocessor and utilizing signals indicative of the pressure in said cylinder at crank angle positions before and after…",
  "path": "/patents/1110082",
  "publishedAt": "2001-09-19T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/1498",
    "GEN MOTORS CORP [US]"
  ],
  "textContent": "A method is disclosed for detecting misfire or partial burn and for controlling spark retard in the cylinders of an internal combustion engine operated under the control of a microprocessor and utilizing signals indicative of the pressure in said cylinder at crank angle positions before and after initiation of combustion. A ratio of the actual pressure to the motored pressure in the cylinder at one or more predetermined crank angles is used to estimate the fraction of fuel burned which, in turn, enables a determination of combustion failure in said cylinder cycle. Confirmation of said misfire or unacceptable partial burn leads to correction of engine operation by said controller and/or to a diagnosis of possible damage to the vehicle's catalytic converter. This method also permits better engine operation under conditions of high spark retard.",
  "title": "Onboard misfire, partial-burn detection and spark-retard control using cylinder pressure sensing"
}