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公开(公告)号：US11674456B1
公开(公告)日：2023-06-13
申请号：US17540574
申请日：2021-12-02
Applicant: PRATT & WHITNEY CANADA CORP.
Inventor： Philippe Beauchesne-Martel , Gaetan De Lussy , Jeremie Hebert , Daniel Coutu
CPC classification number: F02C9/42 , F02C7/36 , F05D2220/329 , F05D2260/4023 , F05D2270/023 , F05D2270/304
Abstract: There is described a method of operating a multi-engine system of an helicopter. The multi-engine system has a first turboshaft engine having a first shaft, a second turboshaft engine having a second shaft, a gearbox having a clutch system, and a range of rotation speeds defined as a placarded zone. The method generally has: rotating the first and second shafts at a flight rotation speed above the placarded zone when clutched to a load; decreasing a rotation speed of the first shaft from the flight rotation speed to a first idle rotation speed above the placarded zone; unclutching the first shaft from the load during the decreasing; and subsequently to the decreasing and the unclutching, simultaneously decreasing the rotation speeds of the first shaft and of the second shaft to a second idle rotation speed below the placarded zone, the simultaneously decreasing including clutching the first shaft to the load.
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公开(公告)号：US11619139B1
公开(公告)日：2023-04-04
申请号：US17592969
申请日：2022-02-04
Applicant: PRATT & WHITNEY CANADA CORP.
Inventor： Philippe Beauchesne-Martel , Jeremie Hebert , Pramuk Fernando , Jasraj Chahal
Abstract: The method can include: monitoring a current value of a rate of reduction of torque of the shaft; providing a threshold value for the rate of reduction of torque of the shaft; and generating a signal indicative of the shaft shear event when the current value exceeds the threshold value.
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Patent Agency Ranking
公开(公告)号：US20220316407A1
公开(公告)日：2022-10-06
申请号：US17220008
申请日：2021-04-01
Applicant: PRATT & WHITNEY CANADA CORP.
Inventor： Simon Lopez , Jeremie Hebert
Abstract: There are described methods and systems for operating an aircraft turboprop engine. The method comprises controlling a propeller of the turboprop engine based on a selected one of a reference propeller rotational speed and a minimum propeller blade angle while the turboprop engine is running; detecting an inflight restart of the turboprop engine; and controlling the propeller during the inflight restart in accordance with at least one of a modified reference propeller rotational speed and a modified minimum propeller blade angle to maintain an actual propeller blade angle above an aerodynamic disking angle during the inflight restart.
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公开(公告)号：US11939914B2
公开(公告)日：2024-03-26
申请号：US17540576
申请日：2021-12-02
Applicant: PRATT & WHITNEY CANADA CORP.
Inventor： Philippe Beauchesne-Martel , Gaetan De Lussy , Jeremie Hebert , Daniel Coutu
CPC classification number: F02C6/02 , B64D27/10 , B64D31/00 , F02C6/20 , F02C9/42 , F05D2220/329 , F05D2260/96 , F05D2270/02
Abstract: There is described a method of operating a multi-engine system of an helicopter. The multi-engine system has a first turboshaft engine having a first shaft, a second turboshaft engine having a second shaft, a gearbox having a clutch system, and a range of rotation speeds defined as a placarded zone. The method generally has rotating the first shaft at a flight rotation speed when clutched and rotating the second shaft at a first idle rotation speed when unclutched, the first idle rotation speed above the placarded zone; decreasing a rotation speed of the first shaft from the flight rotation speed to a given rotation speed within the placarded zone; decreasing a rotation speed of the second shaft to the given rotation speed; clutching the second shaft; and decreasing the rotation speeds of the first and second shafts to a second idle rotation speed below the placarded zone.
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公开(公告)号：US11719167B2
公开(公告)日：2023-08-08
申请号：US17220008
申请日：2021-04-01
Applicant: PRATT & WHITNEY CANADA CORP.
Inventor： Simon Lopez , Jeremie Hebert
CPC classification number: F02C9/16 , B64C11/30 , F02C6/206 , F05D2270/021
Abstract: There are described methods and systems for operating an aircraft turboprop engine. The method comprises controlling a propeller of the turboprop engine based on a selected one of a reference propeller rotational speed and a minimum propeller blade angle while the turboprop engine is running; detecting an inflight restart of the turboprop engine; and controlling the propeller during the inflight restart in accordance with at least one of a modified reference propeller rotational speed and a modified minimum propeller blade angle to maintain an actual propeller blade angle above an aerodynamic disking angle during the inflight restart.
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公开(公告)号：US12163859B2
公开(公告)日：2024-12-10
申请号：US17592970
申请日：2022-02-04
Applicant: PRATT & WHITNEY CANADA CORP.
Inventor： Philippe Beauchesne-Martel , Jeremie Hebert , Pramuk Fernando , Jasraj Chahal
Abstract: The method can include monitoring a current value of a rate of reduction of rotation speed of the shaft; providing a threshold value of a rate of reduction of rotation speed of the shaft; and generating a signal indicative of the shaft shear event when the current value exceeds threshold value.
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公开(公告)号：US10801416B2
公开(公告)日：2020-10-13
申请号：US15585847
申请日：2017-05-03
Applicant: PRATT & WHITNEY CANADA CORP.
Inventor： Sylvain Lamarre , Jeremie Hebert , Pierre Alexandre
Abstract: Herein provided are methods and systems for setting a fuel flow schedule for starting a gas turbine engine of an aircraft. Aircraft speed and engine rotational speed are obtained. A compressor inlet recovered pressure is estimated by combining a first component influenced by the aircraft speed and a second component influenced by the engine rotational speed, and a fuel flow schedule is selected for engine start in accordance with the estimated compressor inlet recovered pressure.
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