{
  "$type": "site.standard.document",
  "description": "The drive circuit (10) applies a negative voltage to a glow plug (12) acting as a sensor and associated with the cylinder for an ion measurement device to determine the conductivity of combustion gases. The negative voltage is generated by a capacitor (20) that is suitably charged after switching…",
  "path": "/patents/1081349",
  "publishedAt": "2004-12-22T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02P19/028",
    "DELPHI TECH INC [US]"
  ],
  "textContent": "The drive circuit (10) applies a negative voltage to a glow plug (12) acting as a sensor and associated with the cylinder for an ion measurement device to determine the conductivity of combustion gases. The negative voltage is generated by a capacitor (20) that is suitably charged after switching off the glow plug via the stored magnetic energy in the internal inductance (16) of the glow plug.",
  "title": "Drive circuit"
}