{
  "$type": "site.standard.document",
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  "description": "An internal combustion engine system is described herein. The system uses a throttle valve at an inlet of a crankcase to control the flowrate of air into the crankcase. The air is used to purge one or more combustible fluids from the crankcase caused from blow-by past one or more piston rings. A…",
  "path": "/patents/1423254",
  "publishedAt": "2026-06-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/0025",
    "Caterpillar Inc."
  ],
  "textContent": "An internal combustion engine system is described herein. The system uses a throttle valve at an inlet of a crankcase to control the flowrate of air into the crankcase. The air is used to purge one or more combustible fluids from the crankcase caused from blow-by past one or more piston rings. A purge controller receives measurements from various detectors to control the flowrate. A concentration detector may be used to detect a concentration of one or more combustible fluids within the crankcase. Pressure and temperature detectors may be used to provide a measurement of the pressure and temperature within the crankcase. The purge controller also uses a venturi valve to increase or decrease the pressure within the crankcase. Additionally, the purge controller can measure an amount of blow-by gases by closing the throttle valve and measuring the rate of increase of the pressure within the crankcase.",
  "title": "SYSTEMS AND METHODS FOR MONITORING AND CONTROLLING CRANKCASE COMBUSTIBLE GAS CONCENTRATIONS"
}