{
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  "description": "An ammonia to NOx ratio (ANR) control system includes an internal combustion engine configured to combust fuel, a valve configured to provide the fuel to the internal combustion engine, and a selective catalytic reduction (SCR) catalyst connected to the internal combustion engine to receive exhaust…",
  "path": "/patents/1423249",
  "publishedAt": "2026-06-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N3/208",
    "Caterpillar Inc."
  ],
  "textContent": "An ammonia to NOx ratio (ANR) control system includes an internal combustion engine configured to combust fuel, a valve configured to provide the fuel to the internal combustion engine, and a selective catalytic reduction (SCR) catalyst connected to the internal combustion engine to receive exhaust generated by combustion of the fuel with the internal combustion engine. The system also includes a reductant injector configured to inject reductant for the SCR catalyst, a sensor connected downstream of the SCR catalyst, and a controller. The controller may be configured to: receive NOx level signals or NHlevel signals from the sensor, generate commands for controlling the reductant injector, and determine, with a perturbation-based control algorithm and based on the NOx or NHlevel signals, commands for controlling the reductant injector.",
  "title": "SYSTEM AND METHOD FOR ADAPTIVE CONTROL OF AMMONIA-NOX RATIO"
}