{
  "$type": "site.standard.document",
  "description": "A system comprising: a venturi duct (26) configured to receive a first bleed air flow and a second bleed air flow; a first delta P sensor (24) configured to sense a pressure difference between a first point and a second point of the venturi duct over a first pressure range, the first delta P sensor…",
  "path": "/patents/1397679",
  "publishedAt": "2025-10-29T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B64D13/06",
    "HAMILTON SUNDSTRAND CORP [US]"
  ],
  "textContent": "A system comprising: a venturi duct (26) configured to receive a first bleed air flow and a second bleed air flow; a first delta P sensor (24) configured to sense a pressure difference between a first point and a second point of the venturi duct over a first pressure range, the first delta P sensor configured to provide a first sensed pressure difference, wherein the first pressure range includes a pressure corresponding to a lowest expected flow rate; a second delta P sensor (28) configured to sense the pressure difference between the first point and the second point of the venturi duct over a second pressure range and provide a second sensed pressure difference, wherein the second pressure range includes a pressure corresponding to a highest expected flow rate; a first temperature sensor (20) configured to sense a temperature of the first and/or second bleed airflow upstream of the venturi duct; a first pressure sensor (22) configured to sense a pressure of the first and/or second bleed airflow upstream of the venturi duct; and an ECS controller (12) configured to receive the first and second sensed pressure differences, to determine a flow rate of an ECS air flow, and to adjust a bleed extraction of an aircraft engine or an auxiliary power unit (APU) based upon the flow rate of the ECS air flow; wherein the ECS controller determines the flow rate of the ECS air flow based on the first sensed pressure difference, the sensed temperature of the first and/or second bleed airflow, and the sensed pressure of the first and/or second bleed airflow when the sensed pressure of the first and/or second bleed airflow upstream of the venturi duct falls within the first pressure range, and wherein the ECS controller determines the flow rate of the ECS air flow based upon the second sensed pressure difference, the sensed temperature of the first and/or second bleed airflow, and the sensed pressure of the first and/or second bleed airflow when the sensed pressure of the first and/or second bleed airflow upstream of the venturi duct falls within the second pressure range.",
  "title": "ADAPTABLE DUAL DELTA-P FLOW MEASUREMENT"
}