{
  "$type": "site.standard.document",
  "description": "A method and system for controlling the air/fuel ratio in an internal combustion engine (12) having first and second groups of cylinders coupled to first and second exhaust banks (20,28), respectively. Each exhaust bank has a catalyst (16,24), a pre-catalyst oxygen sensor (14,22) and a…",
  "path": "/patents/1111418",
  "publishedAt": "2001-07-25T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/1441",
    "FORD GLOBAL TECH INC [US]"
  ],
  "textContent": "A method and system for controlling the air/fuel ratio in an internal combustion engine (12) having first and second groups of cylinders coupled to first and second exhaust banks (20,28), respectively. Each exhaust bank has a catalyst (16,24), a pre-catalyst oxygen sensor (14,22) and a post-catalyst oxygen sensor (18,26), wherein the oxygen sensors monitor the air/fuel ratio in their respective exhaust banks and provide corresponding feedback signals to a controller. The controller (202) uses the feedback signals to control the air/fuel ratio in the engine cylinders. When it is detected that one or the other of the pre-catalyst oxygen sensors (14,22) has degraded, the controller (202) calculates A/F values for the group of cylinders corresponding to the exhaust bank having a degraded EGO sensor based on feedback signals from the three still-functional oxygen sensors.",
  "title": "Method and system for compensating for degraded pre-catalyst oxygen sensor in a two-bank exhaust system"
}