• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method (20) for determining an instant of completion (t_AchO, t_AchF) of a movement of a starting valve (15) of a turbine engine, said valve (15) being adapted to regulate the flow of a pressurized air flow from the upstream (13) downstream (16) of a pipe (12), the downstream side (16) of the pipe (12) being connected to a pneumatic starter (10) of the turbine engine, the method (20) comprising the following steps: Periodically measuring (22) a pressure (P) within the upstream side (13) of the pipe (12), during a phase of movement of the valve (15) Obtain (24) the derivative (P ') of the evolution of the pressure (P) as a function of time Determine (26) the moment at which the derivative (P') changes from a non-zero value to a zero value, this instant corresponding to the time of completion (t_AchO, t_AchF) of the movement of the valve (15)
    公开号:FR3022949A1
    申请号:FR1455962
    申请日:2014-06-26
    公开日:2016-01-01
    发明作者:Guilhem Alcide Auguste Foiret
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD OF THE INVENTION The invention relates to the general field of turbine engine start valves. DETAILED DESCRIPTION OF THE INVENTION The invention relates to the general field of turbine engine start valves. It relates more particularly to methods of determining characteristics of openings or closures of said valves.
    [0002] BACKGROUND OF THE INVENTION To start a turbine engine, a starter delivering a motor torque on the shaft of said turbine engine is used. Such a motor torque is intended to overcome the set of resistive torques imposed on said shaft and resulting mainly from the aerodynamic drag of the rotated parts, the mechanical friction of the parts in contact and the viscous friction losses between the parts in question. contact in the fluid of at least one hydraulic lubrication and / or thermal regulation circuit associated with said turbine engine. The starter gradually accelerates the turbine engine and, when a predetermined rotational speed is reached, the injection and ignition of the fuel in the combustion chamber of the turbine engine are initiated. Then, at another predefined rotation speed, the action of the starter is stopped and the turbine engine continues to accelerate to its idling speed through the combustion of said fuel. The known starters are of the pneumatic type (a turbine powered by compressed air) or of the electric type. In the context of the invention, only the pneumatic starters are considered. Figure 1 shows a pneumatic starter 10 on a fan 11 of a turbine engine of an aircraft. The pneumatic starter 10 is intended to be supplied with compressed air via a pipe 12. Generally, air upstream 13 of the pipe 12 is pressurized via an auxiliary power unit (in English "Auxiliary Power Unit ", APU) located in the aircraft: sometimes the air is pressurized via a group on the ground or by taking air from another turbine engine already started. Whatever the source of compressed air, pressurized air arrives at the upstream side 13 of the pipe, as indicated by the arrow 14, to the pneumatic starter 10.
    [0003] A starter valve 15 (in English "Starter Air Valve", SAV) regulates the flow of air under pressure in the pipe 12: by its opening or closing, the valve 15 is adapted to allow, prevent or limit the conveying the compressed air to the downstream side 16 of the pipe 12 where the pneumatic starter 10 is located. Closed, the starting valve 15 prevents the air under pressure from reaching the pneumatic starter 10. When the turbine engine is started up, the start valve 15 opens gradually, which allows the compressed air to pass to the pneumatic starter 10. The pressurized air then enters the turbine of the starter 10, which transforms the pneumatic energy into mechanical energy to rotate the turbine engine shaft.
    [0004] Note that the air flow received by the starter 10 is directly related to the degree of opening of the starter valve 15. A significant proportion of unsuccessful start-up cases are caused by a blockage opening or closing of the valve starting. Blocked closed, the air starter is never subjected to pressurized air and the shaft does not start rotating. Blocked open, it can cause an overspeed of the pneumatic starter which, once disengaged from the shaft, no longer sees a resistant torque but continues to receive air under pressure.
    [0005] Most air motor starters use a butterfly type start valve. In practice, it is common to use a proximity sensor to know precisely when the butterfly completes an opening movement or a closing movement. Depending on its position, the proximity sensor indicates when the valve is completely closed, or when the valve is fully open. It is noted that such a proximity sensor makes it possible to know if the valve is open, or if the valve is closed, but does not make it possible to give these two informations for the same valve. Two proximity sensors would be needed to know when the valve is open, and when the valve is closed. However, some starter valves do not have such sensors, or the sensor may fail. GENERAL DESCRIPTION OF THE INVENTION It therefore appears necessary to propose an alternative solution to the proximity sensor, making it possible to determine the time of completion of an opening or closing movement of the valve. Thus, it is precisely determined from what time the valve is open, or from when the valve is closed. According to a first aspect, the invention therefore relates to a method for determining an instant of completion of a movement of a starting valve of a turbine engine, said valve being adapted to regulate the flow of a flow of water. air under pressure from upstream to downstream of a pipe, the downstream side of the pipe being connected to a pneumatic starter of the turbine engine, the method comprising the following steps: - periodically measuring a pressure within the upstream side of the pipe during a phase of movement of the valve - Derive the evolution of the pressure as a function of time - Determine the moment at which the derivative changes from a non-zero value to a zero value, this instant corresponding to the moment completion of the valve movement. It is noted that the pipe can be made in one piece, or several pieces assembled, without this changing the principle of the invention. By continuous measurement is meant a measurement made at a sufficiently high acquisition frequency to show the pressure variations.
    [0006] By movement is meant opening or closing of the starter valve. When the movement is an opening, the time of completion of the opening of the valve corresponds to the moment at which the derivative changes from a negative value to a zero value. When the movement is a closure, the time of completion of valve closure corresponds to the moment at which the derivative changes from a positive value to a zero value. It should be noted that when the valve is equipped with a proximity sensor, its measurements can be confirmed, and it is thus possible to determine when the sensor has failed. The pressure measurements are periodically performed at a sufficiently high frequency to accurately follow the pressure variations. This frequency is for example the frequency of the turbine engine computer.
    [0007] In a non-limiting embodiment, the method for determining a moment of completion of a movement of a starter valve comprises the following step, between the derivation step and the determining step: filter the derivative. In some configurations, the measured pressure is not quite stable (for example if at high pressure acquisition frequency); its derivative is therefore more difficult to exploit. Filtering the derivative therefore improves the detection. According to a second aspect, the invention relates to a method for determining a moment of initiation of a movement of a starting valve of a turbine engine, said valve being adapted to regulate the flow of a flow of air under pressure from upstream to downstream of a pipe, the downstream side of the pipe being connected to a pneumatic starter of the turbine engine, the method comprising the following steps: - Periodically measuring a pressure within the upstream side of the during a phase of movement of the valve - Derive the evolution of the pressure as a function of time - Determine the moment at which the derivative passes from a null value to a non-zero value, this instant corresponding to the instant of initiating the movement of the valve.
    [0008] When the movement is an opening, the opening time of the valve opening corresponds to the moment at which the derivative changes from a zero value to a negative value. When the movement is a closure, the valve closing initiation time corresponds to the moment at which the derivative changes from a zero value to a positive value.
    [0009] The pressure measurements are periodically performed at a sufficiently high frequency to accurately follow the pressure variations. This frequency is for example the frequency of the turbine engine computer.
    [0010] In a non-limiting embodiment, the method for determining a moment of initiation of a movement of a starter valve comprises the following step, between the derivation step and the determining step: filter the derivative. In some configurations, the measured pressure is not quite stable (for example when the pressure acquisition frequency is high); its derivative is therefore more difficult to exploit. Filtering the derivative therefore improves the detection. According to a third aspect, the invention relates to a method for determining a duration of a movement of a starter valve of a turbine engine, said valve being adapted to regulate the flow of a pressurized air flow. from upstream to downstream of a pipe, the downstream side of the pipe being connected to a pneumatic starter of the turbine engine, the method comprising the following steps: determining a moment of initiation of a movement of the valve during of a phase of movement of the valve, by implementing a method for determining a moment of initiation according to the second aspect - Determining a moment of completion of the movement of the valve during the phase of movement of the valve , using a method of determining a completion time according to the first aspect - Determining the duration of the valve movement by subtracting the initiation time at the completion time - Compare the duration of the movement detaches reset to a theoretical duration value. The opening or closing time of the valve is used as an indicator to monitor the state of degradation or malfunctions of the valve. Indeed, an opening or closing slower than normal can for example be caused by excessive friction of the butterfly valve, wear of the diaphragm of the valve, contamination of the valve by a foreign body such as sand, frost etc. A comparison of the duration of the movement determined by the method with the duration of the nominal movement indicated by the manufacturer (theoretical value) makes it possible to detect a deterioration or malfunction of the valve. Comparing the evolution of the duration of movement over time also makes it possible to determine the evolution of the degradation or dysfunction. In addition to the characteristics that have just been mentioned in the preceding paragraph, the method for determining a duration of a movement of a starter valve according to the invention may have one or more additional characteristics among the following, considered individually or in all technically possible combinations.
    [0011] In one embodiment, the method for determining a duration of movement comprises the following step: triggering a first alert when the difference between the duration of the determined movement and the theoretical duration value is greater than a duration threshold.
    [0012] Indeed, the degradations that one seeks to detect are progressive. The duration of movement is thus determined regularly, and one follows its evolution. An alert is raised when this movement time is extended beyond a critical time threshold. This alerts the maintenance team before a failure occurs.
    [0013] In one embodiment, the method of determining a duration of motion comprises the following steps: - Determining the pressure difference within the upstream side of the pipe, between the initiation instant and the completion time - Compare the pressure difference with an expected value. Indeed, in normal operation, the pressure loss associated with the opening or closing of the starter valve is supposed to be constant. A loss of pressure lower than the expected value may therefore be a sign that the valve is blocked in the partially open position. It should be noted, however, that the stabilized pressures (before and after opening of the starter valve) within the pipeline may vary according to context parameters, notably the meteorological conditions or the state of the turbine engine (temperature, pressure, state of the source compressed air, etc.). It is therefore appropriate to use a behavior model based on the context parameters to provide the expected value. In one embodiment, the method for determining a duration of movement comprises the following step: triggering a second alarm when the difference between the pressure difference and the expected value is greater than a pressure threshold.
    [0014] According to a fourth aspect, the invention relates to a computer program comprising a set of instructions, which when they are executed by a computer of a turbine engine, causes the implementation of a method according to the first aspect, the second aspect or the third aspect of the invention. The invention and its various applications will be better understood on reading the description which follows and on examining the figures which accompany it. BRIEF DESCRIPTION OF THE FIGURES The figures are presented only as an indication and in no way limitative of the invention. The figures show: - In Figure 1, already described, a schematic representation of a pneumatic starter having a start valve - In Figure 2, a curve representing the percentage of air flow received by the starter depending on the degree In FIG. 3A, a curve representing the pressure upstream of the start valve as a function of time, during an opening of the valve. In FIG. 3B, a curve representing the derivative of the curve of FIG. 3A - In FIG. 4, a schematic representation of the steps of the methods according to the invention. DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT OF THE INVENTION As explained previously and with reference to FIG. 1, the methods according to the invention make it possible to provide indications on a movement (opening or closing) of a starter valve. 15 of a pneumatic starter 10 of a turbine engine. The start valve 15 is placed on a pipe 12 used to convey compressed air from a source of compressed air to the pneumatic starter 10. The air flow received by the starter 10 (placed downstream side 16 of the pipe 12) is directly connected to the degree of opening of the starter valve 15.
    [0015] A curve showing the percentage of air flow received by the starter 10 as a function of the degree of opening of a butterfly valve is given in FIG. 2. As shown in FIG. 2, for a source of compressed air does not regulate at constant pressure, the opening of the start valve 15 (previously closed) gradually allows a flow of air. This causes a decrease in the pressure P in the pipe 12 upstream of the valve 15. Without further air sampling on the circuit conveying the compressed air to the pneumatic starter 10, the pressure drop P within the upstream side 13 of the pipe 12 is an indicator of opening of the valve 15. It is also procedure for the crew to verify that the fall occurs during the start of the turbine engine. The moment of initiation t_AmO of the opening movement of the valve 15 corresponds to the moment of initiation of the pressure drop P of the upstream side 13 of the pipe 12 (that is to say upstream of the start valve 15). Furthermore, the time of completion t_AchO of the opening movement of the valve 15 corresponds to the moment when the pressure P stabilizes on the upstream side of the pipe 12. In contrast, the closing of the start valve 15 ( previously opened) gradually decreases the air flow rate received by the starter 10. This causes an increase in the pressure P in the pipe 12 downstream of the valve 15. No further air sampling on the circuit carrying the air compressed at the pneumatic starter 10, the increase in pressure P within the upstream side 13 of the pipe 12 is therefore a closing indicator of the valve 15.
    [0016] The initiation time tAm_F of the closing movement of the valve 15 corresponds to the moment of initiation of the pressure increase P on the upstream side 13 of the pipe 12. Furthermore, the instant of completion tAch_F of closing movement of the valve 15 corresponds to the moment when the pressure P stabilizes on the upstream side 13 of the pipe 12.
    [0017] One way of determining the instants of initiation tAm_O, tAm_F and completion tAch_O, tAch_F of a movement (opening or closing) of the valve 15 thus passes by the exploitation of the derivative P 'of the pressure P (said derivative possibly being filtered) on the upstream side 13 of the pipe 12. Indeed, before the initiation time tAm_O, tAm_F of an opening or a closure, the upstream pressure P 13 of the pipe 12 is stable, the derivative P 'is therefore zero. Following the initiation moment tAm_O, tAm_F, the pressure P drops (in the case of an opening) or increases (in the case of a closure): the derivative P 'thus becomes negative (in the case of an opening) or positive (in the case of a closure). Finally, following the time of completion tAch_O, tAch_F, that is to say when the valve 15 is in the final position, the pressure P is stabilized: the derivative P 'is again zero. FIG. 3A shows a curve representative of the pressure P of the upstream side 13 of the pipe 12 as a function of time, during an opening of the valve 15. The curve shows three successive phases: in a first phase 17, the pressure P is stable; in a second phase 18, the pressure P decreases, in a third phase 19, the pressure P is again stable. The second phase 18 corresponds to the opening of the valve 15. FIG. 3B shows a curve representative of the derivative P '(filtered) of the curve of FIG. 3A. It can be seen that during the first phase 17, the derivative P 'is zero; in the second phase 18, the derivative P 'is negative; and in the third phase 19, the derivative P 'is again zero. As explained above, the moment of passage between the first phase 17 and the second phase 18 corresponds to the moment of initiation tAm_O of the opening of the valve 15. Moreover, the moment of passage between the second phase 18 and the third phase 19 corresponds to the time of completion tAch_O of the opening of the valve 15. Determining these instants of initiation tAm_O and completion tAch_O of the opening of the valve 15 also makes it possible to deduce the opening time of the valve 15.
    [0018] The same principles apply to the closure of the valve 15. A curve representative of the pressure P on the upstream side of the pipe 12 as a function of time, during a closure of the valve 15, would show three successive phases: in a first phase, the pressure P is stable; in a second phase, the pressure P increases, in a third phase, the pressure P is again stable. The second phase corresponds to the closing of the valve 15. Similarly, a curve representative of the filtered derivative P 'of this curve would show that in the first phase, the derivative P' is zero; in the second phase, the derivative P 'is positive; and in the third phase, the derivative P 'is again zero.
    [0019] The moment of passage between the first and the second phase corresponds to the moment of initiation tAm_F of the closing of the valve 15. Moreover, the moment of passage between the second and the third phase corresponds to the instant tAch_F completion of the closure of the valve 15. Determine these tAm_F initiation times and tAch_F completion of the closure of the valve 15 also allows to deduce the closing time d_F of the valve 15. Figure 4 illustrates steps of three methods: a method 20 for determining the completion time t_AchO, t_AchF for a movement (opening or closing) of the start valve 15, a method 30 for determining the start time t_AmO, t_AmF said movement, and a method 40 for determining a duration of said movement d_0, d_F. The three methods 20, 30, 40 mentioned above comprise common steps. The method 20 for determining the time of completion t_AchO, t_AchF of the movement (opening or closing) of the starting valve 15 comprises the following steps: - Periodically measuring a pressure P within the upstream side 13 of the pipe 12 during a phase of movement of the valve 15. The measurement is performed by means of a pressure sensor generally placed at the outlet of the source of compressed air, the latter being generally located at the tail of the aircraft. Moreover, the acquisition of all the measurements and the realization of all the calculations are carried out by calculator of the airplane, which for example sends the information by wireless link to a station on the ground. An algorithm hosted on the ground is responsible for tracking theft information. The periodic measurements are for example carried out according to a period equal to that of the calculator. Obtain the derivative P 'of the evolution of the pressure P as a function of time; filter the derivative P'; determine the time at which the filtered derivative P 'goes from a non-zero value to a zero value; this time corresponding to the time of completion t_AchO, t_AchF of the movement of the valve 15. It is noted that the filtering step 25 of the derivative P 'is not essential; if it is not performed, then the time of completion t_AchO, t_AchF determined during the determination step 26 is the time at which the derivative P 'goes from a non-zero value to a zero value. The method 30 for determining the initiation time t_AmO, t_AmF of the movement (opening or closing) of the starting valve 15 comprises the following steps: - Periodically measuring a pressure P within the upstream side 13 of the pipe 12 during a movement phase of the valve 15 - obtain the derivative P 'of the evolution of the pressure P as a function of time - filter the derivative P' - determine the time at which the filtered derivative P 'passes from a zero value at a non-zero value, this instant corresponding to the initiation time t_AmO, t_AmF of the movement of the valve 15. It is noted that the filtering step 25 of the derivative P 'is not essential; if it is not performed, then the initiation time t_AmO, t_AmF determined during the determination step 32 is the time at which the derivative P 'goes from a zero value to a non-zero value. Finally, the method 40 for determining the duration d_0, d_F of the movement of a start valve 15 of a turbine engine, said valve 15 being adapted to regulate the flow of a flow of pressurized air from upstream 13 downstream 16 of a pipe 12, the downstream side 16 of the pipe 12 being connected to a pneumatic starter 10 of the turbine engine, the method 40 comprising the following steps: - Determining 32 a start time t_AmO, t_AmF d a movement of the valve 15 during a phase of movement of the valve 15, by implementing the method 30 for determining the initiation time t_AmO, t_AmF of the movement - determining a completion time t_AchO, t_AchF the movement of the valve 15 during said phase of movement of the valve 15, using the method 20 for determining the time of completion t_AchO, t_AchF movement - Determine 42 d_O, d_F duration of the movement of the valve 15 by subtracting the moment of initiation age t_AmO, t_AmF at the time of completion t_AchO, t_AchF - Calculate a difference D1 between the duration d_O, d_F of the determined movement and a theoretical value d_Th of duration. The theoretical value d_Th is for example the value indicated by the manufacturer of the valve. - Trigger 46 a first Al1 alert when the difference D1 between the duration d_O, d_F motion determined and a theoretical value d_Th duration is greater than a threshold S1 duration. In one embodiment: The standard deviation of the healthy distribution of the movement time d_O, d_F of the valve 15 is identified. For example, over 100 movements of a healthy valve, the average value of duration d.sub.O , d_F is 4.5 seconds, with a standard deviation of 0.5 seconds. o The threshold S1 of duration is fixed at three times this standard deviation, ie 1.5 seconds in the example. o In the example, a first alert Al1 is thus raised when the duration of O, d_F movement of the valve 15 is greater than 6 seconds. We note that the damage we are trying to monitor is progressive. The monitoring of the indicator of the duration of the movement of the valve 15 is in trend, that is to say that its flight value is monitored in flight, on many flights.
    [0020] The first alert Al1 is raised when the duration of movement O_, d_F elongates beyond the threshold S1 of critical duration. This makes it possible to alert before a failure occurs, which makes it possible to anticipate maintenance operations. - Determine 48 the pressure difference d_P within the upstream side 13 of the pipe 12, between the initiation time t_AmO, t_AmF and the completion time t_AchO, t_AchF - Calculate 50 a difference D2 between the pressure difference d_P and an expected value d_Att - Trigger 52 a second alert Al2 when the difference D2 between the pressure difference d_P and the expected value d_Att is greater than a threshold S2 pressure. In normal operation, the pressure difference d_P related to the opening of the start valve 15 is supposed to be constant. A pressure difference d_P lower than previously measured levels may therefore be a sign of a partially open or closed blocked valve. It should nevertheless be noted that the stabilized pressures P (before and after movement of the valve 15) within the pipe 12 may vary according to the conditions of the day (temperature, pressure, state of the source of compressed air, etc.). It is therefore appropriate to use a model of sound behavior of the system, based on context parameters, to detect a blockage of the valve 15. In one embodiment, a learning phase is used to construct a sound model of the pressure P depending on the context (ambient temperature, ambient pressure, etc.). The learning phase requires for example 300 movements of the valve 15, to have a context as representative as possible. Then, in normal operation, for each movement (opening or closing) of the valve 15, the model will give the expected value d_Att pressure depending on the startup context. It is this expected value of Att which is compared with the determined value of pressure difference d_P, and makes it possible to detect when the valve is partially open or closed.
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. A method (20) for determining an instant of completion (t_AchO, t_AchF) of a movement of a starting valve (15) of a turbine engine, said valve (15) being adapted to regulate the flow of a flow of air under pressure from upstream (13) downstream (16) of a pipe (12), the downstream side (16) of the pipe (12) being connected to a pneumatic starter (10) of the turbine engine, the method (20) comprising the following steps: - Periodically measuring (22) a pressure (P) within the upstream side (13) of the pipe (12), during a phase of movement of the valve (15) - Obtain (24) the derivative (P ') of the evolution of the pressure (P) as a function of time - Determine (26) the moment at which the derivative (P') changes from a non-zero value to a value zero, this time corresponding to the time of completion (t_AchO, t_AchF) of the movement of the valve (15).
    [0002]
    A method (20) for determining a completion time (t_AchO, t_AchF) according to claim 1, comprising the next step, between the derivation step (24) and the determining step (26) of the time of completion (t_AchO, t_AchF): filter (25) the derivative (P ').
    [0003]
    3. Method (30) for determining a moment of initiation (t_AmO, t_AmF) of a movement of a starting valve (15) of a turbine engine, said valve (15) being adapted to regulate the flow a flow of air under pressure from upstream (13) downstream (16) of a pipe (12), the downstream side (16) of the pipe (12) being connected to a pneumatic starter ( 10) of the turbine engine, the method (30) comprising the following steps: - Periodically measuring (22) a pressure (P) within the upstream side (13) of the pipe (12), during a phase of movement of the valve ( 15) Obtain (24) the derivative (P ') of the evolution of the pressure (P) as a function of time Determine (32) the moment at which the derivative (P') goes from a zero value to a non zero, this instant corresponding to the moment of initiation (t_AmO, t_AmF) of the movement of the valve (15).
    [0004]
    4. A method (30) for determining a start time (t_AmO, t_AmF) according to claim 3, comprising the following step, between the bypass step (24) and the determination step (32) of the start time (t_AmO, t_AmF): filter (25) the derivative (P ').
    [0005]
    5. Method (40) for determining a duration (d_O, d_F) of a movement of a starting valve (15) of a turbine engine, said valve (15) being adapted to regulate the flow of a flow of air under pressure from upstream (13) downstream (16) of a pipe (12), the downstream side (16) of the pipe (12) being connected to a pneumatic starter (10) of turbine engine, the method (40) comprising the following steps: determining (32) a moment of initiation (t_AmO, t_AmF) of a movement of the valve (15) during a phase of movement of the valve (15), implementing a method (30) according to one of claims 3 to 4 Determine (26) a completion time (t_AchO, t_AchF) of the movement of the valve (15) during said phase of movement of the valve ( 15), using a method (20) according to one of claims 1 to 2 Determine (42) the duration (d_O, d_F) of the movement of the valve (15) by subtraction of the initiation time ( t_AmO, t_AmF) to the insta completion number (t_AchO, t_AchF) Calculate (44) a difference (D1) between the duration (d_O, d_F) of the determined movement and a theoretical value (d_Th) of duration.
    [0006]
    6. Method (40) for determining a duration (d_O, d_F) of motion according to claim 5, comprising the step of: triggering (46) a first alert (AI1) when the difference (D1) between the duration ( d_O, d_F) of the determined motion and a theoretical value (d_Th) of duration is greater than a threshold (S1) of duration.
    [0007]
    A method (40) for determining a motion time (d_O, d_F) according to claim 5 or claim 6, comprising: determining (48) the pressure difference (d_P) within the upstream side (13) of the pipe (12), between the initiation instant (t_AmO, t_AmF) and the completion time (t_AchO, t_AchF) calculating (50) a difference (D2) between the pressure difference (d_P) and a value expected (d_Att).
    [0008]
    8. A method (40) for determining a duration (d_O, d_F) of motion according to claim 7, comprising the step of: triggering (52) a second alert (Al2) when the difference (D2) between the difference of pressure (d_P) and the expected value (d_Att) is greater than a pressure threshold (S2).
    [0009]
    9. Computer program comprising a set of instructions, which when executed by a computer of a turbine engine, causes the implementation of a method (40) according to one of claims 5 to 8.
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    同族专利:
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    US20150377141A1|2015-12-31|
    US10024240B2|2018-07-17|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    法律状态:
    2015-06-12| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-01| PLSC| Search report ready|Effective date: 20160101 |
    2016-06-08| PLFP| Fee payment|Year of fee payment: 3 |
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    2017-11-10| CD| Change of name or company name|Owner name: SNECMA, FR Effective date: 20170713 |
    2018-06-05| PLFP| Fee payment|Year of fee payment: 5 |
    2020-05-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-05-19| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1455962A|FR3022949B1|2014-06-26|2014-06-26|METHODS FOR DETERMINING CHARACTERISTICS OF OPENINGS OR CLOSURES OF A TURBOMOTEUR STARTING VALVE|FR1455962A| FR3022949B1|2014-06-26|2014-06-26|METHODS FOR DETERMINING CHARACTERISTICS OF OPENINGS OR CLOSURES OF A TURBOMOTEUR STARTING VALVE|
    US14/751,953| US10024240B2|2014-06-26|2015-06-26|Method for determining a duration of movement for a starter air valve of a turbine engine|
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