A method for fault-tolerant control of a combination of fluidic pre-cooling sensors

Abstract

The application belongs to the field of aero-engine refrigeration, and particularly relates to a jet pre-cooling sensor combination fault tolerance control method. A partition flow and a feedback value of a first sensor of a water outlet are subtracted to obtain a middle ring control deviation. The middle ring control deviation is calculated through a PID algorithm to obtain a middle ring control target. The middle ring control target and a feedback value of a second sensor of the water outlet are subtracted to obtain an inner ring control deviation. The inner ring control deviation is calculated through the PID algorithm to obtain an inner ring control target. A control current input quantity I of an electro-hydraulic servo valve is controlled through the inner ring control target. The current input quantity I controls the opening degree of a water outlet valve and further controls the water flow of the water outlet. When the second sensor fails, the first sensor fails, and a smooth water supply demand is formed through a combination mode.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aero-engine refrigeration, and particularly relates to a jet pre-cooling sensor combination fault tolerance control method. BACKGROUND

[0002] In recent years, a large number of researches have been carried out at home and abroad on the jet pre-cooling expansion envelope of a turbine engine, that is, a water injection pre-cooling device is installed in an air inlet, and atomized liquid water is injected into the air inlet, so that the water evaporation absorbs heat and reduces the engine inlet total temperature.

[0003] China Aero-engine Research and Manufacturing Co., Ltd. actively carries out key technology research on jet pre-cooled engines, and completes jet pre-cooled whole machine ground verification under ground warming of 316.7 DEG C based on a certain type of engine, which verifies the technical feasibility of jet pre-cooled expansion of a turbine engine envelope.

[0004] The jet pre-cooling control system researched in China is composed of a digital electronic controller, a water pump and a control device, wherein the control device integrates a three-zone electro-hydraulic servo valve, a three-zone displacement sensor, a water supply pressure sensor and a three-zone metering valve rear pressure sensor. The jet pre-cooling control system takes the turbine base inlet total temperature as the controlled quantity, and the three zones adopt the control form of "outer ring + middle ring + inner ring" to improve the steady-state performance and dynamic performance of the system, wherein the outer ring is a turbine base inlet total temperature control loop, the middle ring is a metering valve outlet pressure control loop, and the inner ring is a metering valve displacement control loop.

[0005] The sensor fault handling strategy of the existing aero-engine jet pre-cooling control system causes the control quality of the inlet total temperature to degrade too quickly. When the displacement sensor fails, the fault handling strategy is to set the electro-hydraulic servo valve current to control the opening and closing of the metering valve in an open loop; when the pressure sensor fails, the fault handling strategy is to set the metering valve to a fixed value in an open loop.

[0006] When the displacement sensor of the metering valve fails, the inner ring cannot form a closed loop, and the temperature closed-loop control loop cannot perform normal temperature control. Generally, in order to ensure the safety of the aero-engine, no matter what the working state of the aero-engine is, the electro-hydraulic servo valve current is set to the maximum value through open-loop control, and the metering valve is fully opened to ensure the cooling effect of the engine inlet total temperature. However, this method does not consider the use requirements of the aircraft on the aero-engine, resulting in low water utilization rate, and sometimes the water carried by the aircraft is insufficient to support the smooth completion of mode conversion. In addition, too much water injected into the engine can easily cause the engine to stall. When the pressure sensor fails, the middle ring cannot form a closed loop, and the temperature closed-loop control loop cannot perform normal temperature control. Similar to the displacement sensor fault of the inner ring, the above problems also exist. SUMMARY

[0007] To solve the above problems, the application provides a kind of jet precooling sensor combination fault-tolerant control method, comprising:

[0008] Step S1: according to the aircraft Mach number, the expected value T2_Dem of engine inlet total temperature is calculated,

[0009] Step S2: the deviation value Delta_T2 obtained by the difference between the expected value T2_Dem and the inlet total temperature T2 collected by the engine inlet sensor;

[0010] Step S3: the water flow target value Ww_dem is calculated based on the deviation value Delta_T2;

[0011] Step S4: the water flow target value Ww_dem is divided into multiple partition flows, and multiple same water supply partitions supply water according to the partition flow;

[0012] In step S4, the specific method for the water supply partition to supply water according to the partition flow comprises:

[0013] Step S41: the partition flow is subtracted from the feedback value of the first sensor of the outlet to obtain the intermediate ring control deviation;

[0014] Step S42: the intermediate ring control deviation is calculated by PID algorithm to obtain the intermediate ring control target;The intermediate ring control target is subtracted from the feedback value of the second sensor of the outlet to obtain the inner ring control deviation, and the inner ring control deviation is calculated by PID algorithm to obtain the inner ring control target;

[0015] Step S43: the inner ring control target is used to control the current input I of the electro-hydraulic servo valve, and the current input I controls the opening degree of the outlet valve and further controls the water flow of the outlet;

[0016] The water supply partition includes a first zone, a second zone and a third zone, the maximum allowable flow of the first zone is A, the maximum allowable flow of the first zone is B, and the maximum allowable flow of the third zone is C:

[0017] When the water flow target value Ww_dem is less than a (kg / s), only the first zone supplies water;

[0018] When the water flow target value Ww_dem is greater than or equal to a (kg / s) and less than b (kg / s), only the first zone and the second zone supply water, and the partition flow of the first zone and the second zone is the same;

[0019] When the water flow target value Ww_dem is greater than or equal to b (kg / s), the first zone, the second zone and the third zone supply water at the same time, and the partition flow of the first zone and the second zone is the same, and the partition flow of the third zone is different from that of the first zone and the second zone;

[0020] Wherein,

[0021] Mode one is entered when the second sensor of any water supply sub-zone fails,

[0022] Mode one includes: the PID algorithm takes the middle loop control target as the inner loop control deviation;

[0023] When at least two sensors fail, at least one of which is the first sensor, step S3 jumps to step S5: step S5 has multiple modes, including:

[0024] Mode two, the second sensors of the first sub-zone and the second sub-zone fail;

[0025] When Ww_dem≤C, the first sub-zone and the second sub-zone are not opened; the sub-zone flow rate Ww3_dem of the third sub-zone is equal to the water flow target value Ww_dem;

[0026] When the first preset value > Ww_dem > C, the first sub-zone is fully opened, and the sub-zone flow rate Ww3_dem of the third sub-zone is the remaining demand water flow rate; wherein the first preset value is between the maximum allowable flow rate of the third sub-zone and the sum of the maximum allowable flow rate of the third sub-zone and the maximum allowable flow rate of the first sub-zone;

[0027] When the water flow target value Ww_dem > the first preset value, the first sub-zone and the second sub-zone are fully opened, and the sub-zone flow rate Ww3_dem of the third sub-zone is the remaining demand water flow rate;

[0028] Mode three: the second sensors of the first sub-zone and the third sub-zone fail;

[0029] When Ww_dem < B, the sub-zone flow rate Ww2_dem of the second sub-zone is Ww_dem;

[0030] When B ≤ Ww_dem < A + B, the first sub-zone is fully opened, and the sub-zone flow rate Ww2_dem of the second sub-zone is the remaining demand water flow rate;

[0031] When A + B ≤ Ww_dem < C, the first sub-zone is not opened, the third sub-zone is set to K1 times the full stroke, and the sub-zone flow rate Ww2_dem of the second sub-zone is the remaining demand water flow rate;

[0032] When C ≤ Ww_dem < C + B, the first sub-zone is not opened, the third sub-zone is set to the full stroke, and the sub-zone flow rate Ww2_dem of the second sub-zone is the remaining demand water flow rate;

[0033] When C + B ≤ Ww_dem, the first sub-zone is set to the full stroke, the third sub-zone is set to the full stroke, and the sub-zone flow rate Ww2_dem of the second sub-zone is the remaining demand water flow rate;

[0034] Mode four: the second sensors of the second sub-zone and the third sub-zone fail;

[0035] Interchange the first zone and the second zone of mode three; interchange the maximum allowable flow rate of the first zone and the second zone;

[0036] Mode five: the second sensor of the first zone fails with the first sensor of the first zone;

[0037] When Ww_dem≤B, abandon the first zone water supply control, Ww2_dem is set as Ww_dem, and the third zone is not supplied with water;

[0038] When B

[0039] When A+B

[0040] When B+C

[0041] Mode six: the second sensor of the second zone fails with the first sensor of the second zone

[0042] Interchange the first zone and the second zone of mode five; interchange the maximum allowable flow rate of the first zone and the second zone;

[0043] Mode seven: the second sensor of the third zone fails with the first sensor of the third zone

[0044] Interchange the first zone and the third zone of mode five; interchange the maximum allowable flow rate of the first zone and the third zone;

[0045] Mode eight: the second sensor fails with the first sensor not in the same water supply zone;

[0046] When the first sensor fails, the PID algorithm takes the inner loop control target as the inner loop control deviation;

[0047] When the second sensor fails, the PID algorithm takes the inner loop control deviation of the water supply zone with the same zone flow rate as the inner loop control deviation of the water supply zone.

[0048] Mode nine: the sensor combination fails;

[0049] The bias value Delta_T2 is calculated by the PID algorithm to calculate the control current input I of the electro-hydraulic servo valve of the third zone, the current input I controls the opening degree of the outlet valve and further controls the water flow rate of the outlet.

[0050] Preferably, the maximum allowable flow rate A of the first zone is equal to the maximum allowable flow rate B of the first zone.

[0051] Preferably, the first sensor comprises a second sensor for measuring the water outlet water pressure; and the second sensor comprises a first sensor for measuring the water outlet valve opening degree.

[0052] Preferably, K1 is 0.65.

[0053] Preferably, a = A, and A + B = b.

[0054] Preferably, the PID algorithm includes proportional control, integral control and differential control.

[0055] Preferably, the PID algorithm is used to calculate the water flow target value Ww_dem from the deviation value Delta_T2.

[0056] Preferably, the proportional coefficient, integral constant and differential constant of the PID algorithm in mode nine are obtained by changing the PID algorithm used to calculate the water flow target value Ww_dem from the deviation value Delta_T2.

[0057] The advantages of the present application include: if the metering valve and pressure sensor combination fails, the scheme can change the adjustment plan to eliminate the metering valve control loop or the pressure loop that has failed to form a closed loop; although each loop is not designed with redundancy, the control plan can be reconstructed through the dissimilar third zone control loop, although the control performance may be reduced, the safety of the aero-engine can be ensured, and the engine inlet total temperature closed loop control capability is still good. BRIEF DESCRIPTION OF DRAWINGS

[0058] Fig. 1 is a schematic diagram of a jet pre-cooling control according to a preferred embodiment of the present application;

[0059] Fig. 2 is a schematic diagram of a jet pre-cooling control loop according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to make the technical solutions of the present application and their advantages clearer, the technical solutions of the present application will be further clearly and completely described below in combination with the drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present application, and are only used to explain the present application, but not to limit the present application. It should be noted that, for the purpose of description, only parts related to the present application are shown in the drawings, and other related parts can be referred to the usual design. In the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined to obtain new embodiments.

[0061] In addition, unless otherwise defined and limited, the technical terms or scientific terms used in the description of the present application shall be the general meaning understood by the general technical personnel in the field of the present application. The words such as "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer" and the like used in the description of the present application only indicate relative direction or positional relationship, and not indicate that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and the relative positional relationship may also change accordingly when the absolute position of the described object changes, therefore it cannot be understood as a limitation on the present application. The "first", "second", "third" and the like used in the description of the present application are only for the purpose of description, in order to distinguish different components, and cannot be understood as indicating or implying relative importance. The "one", "a" or "the" and the like used in the description of the present application should not be understood as an absolute limitation on the quantity, but should be understood as the presence of at least one. The "includes" or "contains" and the like used in the description of the present application means that the elements or objects appearing before the word are covered by the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0062] In addition, it should be further pointed out that, unless otherwise explicitly specified and limited, the "installation", "connection", "connection" and the like used in the description of the present application should be understood in a broad sense, for example, the connection can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements, the person skilled in the art can understand the specific meaning of the present application according to the specific circumstances.

[0063] As Figs. 1-2 A jet pre-cooling sensor combination fault tolerance control method, comprising:

[0064] Step S1: calculating the expected value T2_Dem of engine inlet total temperature according to the Mach number of the aircraft,

[0065] Step S2: the deviation value Delta_T2 is obtained by subtracting the expected value T2_Dem from the inlet total temperature T2 collected by the engine inlet sensor;

[0066] Step S3: calculating the water flow target value Ww_dem based on the deviation value Delta_T2;

[0067] Step S4: dividing the water flow target value Ww_dem into multiple partition flows, and multiple same water supply partitions supply water according to the partition flow;

[0068] In step S4, the specific method for the water supply partition to supply water according to the partition flow comprises:

[0069] Step S41: difference between the partition flow and the feedback value of the first sensor of the water outlet to obtain the middle ring control deviation;

[0070] Step S42: the middle ring control deviation is calculated by the PID algorithm to obtain the middle ring control target; difference between the middle ring control target and the feedback value of the second sensor of the water outlet to obtain the inner ring control deviation, the inner ring control deviation is calculated by the PID algorithm to obtain the inner ring control target;

[0071] Step S43: the inner ring control target controls the current input amount I of the electro-hydraulic servo valve, the current input amount I controls the opening degree of the water outlet valve and further controls the water flow of the water outlet;

[0072] The water supply partition includes a first zone, a second zone and a third zone, the maximum allowable flow of the first zone is A, the maximum allowable flow of the first zone is B, and the maximum allowable flow of the third zone is C:

[0073] When the water flow target value Ww_dem is less than a (kg / s), only the first zone supplies water;

[0074] When the water flow target value Ww_dem is greater than or equal to a (kg / s) and less than b (kg / s), only the first zone and the second zone supply water, and the partition flow of the first zone and the second zone is the same;

[0075] When the water flow target value Ww_dem is greater than or equal to b (kg / s), the first zone, the second zone and the third zone supply water at the same time, and the partition flow of the first zone and the second zone is the same, and the partition flow of the third zone is different from that of the first zone and the second zone;

[0076] Wherein,

[0077] When the second sensor of any water supply partition fails, mode one is entered,

[0078] Mode one includes: the PID algorithm takes the middle ring control target as the inner ring control deviation;

[0079] When at least two sensors fail, at least one of which is the first sensor, step S3 jumps to step S5: step S5 has multiple modes, including:

[0080] Mode two, the second sensors of the first zone and the second zone fail;

[0081] When Ww_dem≤C, the first zone and the second zone are not opened; the partition flow Ww3_dem of the third zone is equal to the water flow target value Ww_dem;

[0082] When the first preset value > Ww_dem > C, the first zone is fully opened, and the partition flow Ww3_dem of the third zone is the remaining demand water flow; wherein the first preset value is between the maximum allowable flow of the third zone and the sum of the maximum allowable flow of the third zone and the maximum allowable flow of the first zone;

[0083] When the water flow target value Ww_dem > the first preset value, the first zone and the second zone are fully opened, and the partition flow Ww3_dem of the third zone is the remaining demand water flow;

[0084] Mode three: the first zone and the third zone second sensor fault;

[0085] When Ww_dem < B, the second zone partition flow Ww2_dem = Ww_dem;

[0086] When B ≤ Ww_dem < A + B, the first zone is fully opened, and the partition flow Ww2_dem of the second zone is the remaining demand water flow;

[0087] When A + B ≤ Ww_dem < C, the first zone is not opened, the third zone is set to K1 times full stroke, and the partition flow Ww2_dem of the second zone is the remaining demand water flow;

[0088] When C ≤ Ww_dem < C + B, the first zone is not opened, the third zone is set to full stroke, and the partition flow Ww2_dem of the second zone is the remaining demand water flow;

[0089] When C + B ≤ Ww_dem, the first zone is set to full stroke, the third zone is set to full stroke, and the partition flow Ww2_dem of the second zone is the remaining demand water flow;

[0090] Mode four: the second zone and the third zone second sensor fault;

[0091] Interchange the first zone and the second zone of mode three, and interchange the maximum allowable flow of the first zone and the second zone;

[0092] Mode five: the first zone second sensor and the first zone first sensor fault;

[0093] When Ww_dem ≤ B, the first zone water supply control is abandoned, Ww2_dem is set to Ww_dem, and the third zone is not supplied with water;

[0094] When B < Ww_dem ≤ A + B, the first zone is set to full stroke, the partition flow Ww2_dem of the second zone is the remaining demand water flow, and the third zone is not supplied with water;

[0095] When A + B < Ww_dem ≤ B + C, the first zone water supply is abandoned, the second zone is full stroke, and the third zone partition flow is the remaining demand water flow;

[0096] When B+C

[0097] Mode six: second zone second sensor and second zone first sensor fault

[0098] Interchange mode five first zone and second zone; interchange first zone and second zone maximum allowable flow;

[0099] Mode seven: third zone second sensor and third zone first sensor fault

[0100] Interchange mode five first zone and third zone; interchange first zone and third zone maximum allowable flow;

[0101] Mode eight: second sensor and first sensor not in the same water supply subarea fault;

[0102] When the first sensor fails, the PID algorithm takes the inner loop control target as the inner loop control deviation;

[0103] When the second sensor fails, the PID algorithm obtains the inner loop control deviation of the water supply subarea with the same subarea flow as the inner loop control deviation of the water supply subarea.

[0104] Mode nine: sensor combination fault;

[0105] The bias value Delta_T2 is calculated by the PID algorithm to calculate the control current input I of the third zone electro-hydraulic servo valve, and the current input I controls the opening degree of the outlet valve and further controls the water flow of the outlet.

[0106] When A=1.75; B=1.75; C=4, there are the following embodiments

[0107] Mode one: double displacement sensor fault or triple displacement sensor fault

[0108] Displacement sensor fault can be considered as independent fault, and both are according to single displacement sensor fault fault-tolerant control. The following takes the first zone displacement sensor fault as an example for description.

[0109] Step 1: According to the Mach number Ma, the outer loop engine inlet temperature is set as the control target T2_dem of closed loop control, and the temperature T2 of the real-time set collected by the engine inlet temperature sensor and fed back to the electronic controller is obtained. The control deviation is obtained by subtracting the target value from the sensor feedback value;

[0110] Step 2: According to the PID algorithm of formula (1), the inner loop control target Ww_dem is obtained, wherein k p_out , T i_out , T d_outouter loop proportional coefficient, outer loop integral constant and outer loop differential constant, respectively:

[0111]

[0112] Step 3: Flow distribution is performed on the target value Ww_dem obtained in Step 2 to obtain a first zone flow given Ww1_dem, and P1_out_dem is obtained through one-dimensional table lookup, and then the difference between P1_out_dem and P1_out is obtained to obtain a middle loop control deviation, and the control current input I of the electro-hydraulic servo valve is obtained according to the PID algorithm of formula (2), wherein k p_m , T i_m , T d_m are the changed middle loop proportional coefficient, middle loop integral constant and middle loop differential constant, respectively:

[0113]

[0114] Step 4: The current I drives the metering valve to move, controls the metering valve opening degree, adjusts the water quantity in real time, and further controls the engine inlet temperature T2.

[0115] Mode two: double pressure sensor fault, cancel middle loop control

[0116] Mode two: first zone and second zone pressure sensor fault;

[0117] Step 1: The outer loop engine inlet temperature is set as a closed loop control target T2_dem according to the Mach number Ma, the engine inlet temperature sensor collects the real-time set and feeds back the temperature T2 to the electronic controller, and the control deviation is obtained by subtracting the target value from the sensor feedback value;

[0118] Step 2: The middle loop control target Ww_dem is obtained according to the PID algorithm of formula (1);

[0119] Step 3:

[0120] When Ww_dem≤4kg / s, the first zone and the second zone are not opened, and the third zone Ww3_dem is set as Ww_dem;

[0121] When 4kg / s<Ww_dem≤5kg / s, the second zone is not opened, the first zone LVDT1_dem is the full stroke of LVDT1, and the third zone Ww3_dem is set as Ww_dem-1.75;

[0122] When 5kg / s<Ww_dem, the first zone LVDT1_dem is the full stroke of LVDT1, the second zone LVDT2_dem is the full stroke of LVDT2, and the third zone Ww3_dem is set as Ww_dem-3.5;

[0123] Mode three: first zone and third zone pressure sensor fault

[0124] Step 1: Set the outer ring engine inlet temperature as the closed-loop control target T2_dem according to the Mach number Ma, the engine inlet temperature sensor collects the real-time set and feeds back the temperature T2 to the electronic controller, and the control deviation is obtained by subtracting the target value from the sensor feedback value;

[0125] Step 2: Obtain the middle ring control target Ww_dem according to the PID algorithm of formula (1);

[0126] Step 3:

[0127] When Ww_dem≤1.75 kg / s, the first zone and the third zone are not opened, and the second zone Ww2_dem is set as Ww_dem;

[0128] When 1.75 kg / s < Ww_dem≤3.5 kg / s, the first zone LVDT1_dem is the full stroke of LVDT1, the second zone Ww2_dem is set as Ww_dem-1.75, and the third zone is not opened;

[0129] When 3.5 kg / s < Ww_dem≤4 kg / s, the first zone is not opened, the second zone Ww2_dem is set as Ww_dem-2.5, and the third zone LVDT3_dem is set as 0.65*full stroke of LVDT3;

[0130] When 4 kg / s < Ww_dem≤5.75 kg / s, the first zone is not opened, the second zone is set as Ww_dem-4, and the third zone Ww3_dem is set as the full stroke of LVDT3;

[0131] When 5.75 kg / s < Ww_dem, the first zone LVDT1_dem is the full stroke of LVDT1, the second zone is set as Ww_dem-5.75, and the third zone Ww3_dem is set as the full stroke of LVDT3.

[0132] Mode four: second zone and third zone pressure sensor fault

[0133] Since the first zone and the second zone are symmetrical structures, the first zone and the second zone are planned to be interchanged similar to the fault-tolerant method of mode three.

[0134] Mode five: first zone pressure sensor and first zone displacement sensor fault

[0135] When Ww_dem≤1.75 kg / s, abandon the first zone water supply control, set Ww2_dem as Ww_dem, and the third zone is not supplied with water;

[0136] When 1.75 kg / s < Ww_dem < 3.5 kg / s, the first zone LVDT1_dem is LVDT full stroke, Ww2_dem is set to Ww_dem - 1.75, and the third zone is not supplied with water;

[0137] When 3.5 kg / s < Ww_dem < 5.75 kg / s, the first zone is abandoned, the second zone LVDT2_dem is LVDT2 full stroke, and the third zone Ww3_dem is set to Ww_dem - 1.75;

[0138] When 5.75 kg / s < Ww_dem, the first zone LVDT1_dem is LVDT full stroke, the second zone LVDT2_dem is LVDT2 full stroke, and the third zone Ww3_dem is set to Ww_dem - 3.5;

[0139] Mode six: second zone pressure sensor and second zone displacement sensor fault

[0140] Since the first zone and the second zone are symmetrical structures, similar to the mode five fault-tolerant method, the first zone and the second zone are planned to be interchanged.

[0141] Mode seven: third zone pressure sensor and third zone displacement sensor fault

[0142] When Ww_dem < 1.75 kg / s, the first zone Ww1_dem is set to Ww_dem water supply, and the second and third zones are not supplied with water;

[0143] When 1.75 kg / s < Ww_dem < 3.5 kg / s, the first zone Ww1_dem is set to Ww_dem / 2, Ww2_dem is set to Ww_dem / 2, and the third zone is not supplied with water;

[0144] When 3.5 kg / s < Ww_dem < 4 kg / s, the first zone Ww1_dem is set to Ww_dem - 2.5, the second zone is not supplied with water, and the third zone LVDT3_dem is set to 0.65*LVDT3 full stroke;

[0145] When 4 kg / s < Ww_dem < 5.75 kg / s, the first zone Ww1_dem is set to Ww_dem - 4, the second zone is not supplied with water, and the third zone Ww3_dem is set to LVDT3 full stroke;

[0146] When 5.75 kg / s < Ww_dem, the first zone Ww1_dem is set to the second zone Ww2_dem is set to and the third zone Ww3_dem is set to LVDT3 full stroke.

[0147] Mode eight: pressure and displacement are not in the same loop fault

[0148] Displacement is handled according to single displacement sensor fault, pressure is handled according to single pressure sensor fault.

[0149] Mode nine: remaining sensor combination fault

[0150] Step 1: according to the Mach number Ma, the engine inlet temperature of the outer ring is set as the control target T2_dem of closed-loop control, the temperature T2 of the engine inlet temperature sensor is collected in real time and fed back to the electronic controller, the control deviation is obtained by subtracting the target value from the sensor feedback value;

[0151] Step 2: the inner loop current is obtained according to the PID algorithm of formula (3), wherein k p_out , T i_out , T d_out are the changed outer loop proportional coefficient, outer loop integral constant and outer loop differential constant respectively, and the third zone current is as follows:

[0152]

[0153] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for fault-tolerant control of a combination of a fluidic pre-cooled sensor, characterized in that, Comprising: Step S1: calculating the expected value T2_Dem of engine inlet total temperature according to the Mach number of the aircraft, Step S2: obtaining the deviation value Delta_T2 by subtracting the expected value T2_Dem from the inlet total temperature T2 collected by the engine inlet sensor; Step S3: calculating the water flow target value Ww_dem based on the deviation value Delta_T2; Step S4: dividing the water flow target value Ww_dem into multiple sub-zone flows, and supplying water in multiple same water supply sub-zones according to the sub-zone flows; In step S4, the specific method for supplying water in the water supply sub-zone according to the sub-zone flow comprises: Step S41: obtaining the middle ring control deviation by subtracting the feedback value of the first sensor of the water outlet from the sub-zone flow; Step S42: obtaining the middle ring control target by calculating the middle ring control deviation through the PID algorithm; obtaining the inner ring control deviation by subtracting the feedback value of the second sensor of the water outlet from the middle ring control target, and obtaining the inner ring control target by calculating the inner ring control deviation through the PID algorithm; Step S43: controlling the current input I of the electro-hydraulic servo valve through the inner ring control target, and controlling the water flow of the water outlet through the opening degree of the water outlet valve controlled by the current input I; The water supply sub-zone comprises a first zone, a second zone and a third zone, the maximum allowable flow of the first zone is A, the maximum allowable flow of the second zone is B, and the maximum allowable flow of the third zone is C: When the water flow target value Ww_dem is less than a (kg / s), only the first zone supplies water; When the water flow target value Ww_dem is greater than or equal to a (kg / s) and less than b (kg / s), only the first zone and the second zone supply water, and the sub-zone flows of the first zone and the second zone are the same; When the water flow target value Ww_dem is greater than or equal to b (kg / s), the first zone, the second zone and the third zone supply water at the same time, and the sub-zone flows of the first zone and the second zone are the same, and the sub-zone flow of the third zone is different from the sub-zone flows of the first zone and the second zone; Wherein, When the second sensor of any water supply sub-zone fails, mode one is entered, Mode one includes: the PID algorithm takes the middle ring control target as the inner ring control deviation; When at least two sensors fail, at least one of which is the first sensor, step S3 jumps to step S5: step S5 has multiple modes, including: Mode two, the second sensors of the first zone and the second zone fail; When Ww_dem≤C, the first zone and the second zone are not opened; the sub-zone flow Ww3_dem of the third zone is equal to the water flow target value Ww_dem; When the first preset value> Ww_dem> C, the first zone is fully opened, and the sub-zone flow Ww3_dem of the third zone is the remaining demand water flow; wherein the first preset value is between the maximum allowable flow of the third zone and the sum of the maximum allowable flow of the third zone and the maximum allowable flow of the first zone; When the water flow target value Ww_dem> the first preset value, the first zone and the second zone are fully opened, and the sub-zone flow Ww3_dem of the third zone is the remaining demand water flow; Mode three: the second sensors of the first zone and the third zone fail; When Ww_dem<B, the sub-zone flow Ww2_dem of the second zone is equal to Ww_dem; When B≤Ww_dem<A+B, the first zone is fully open, and the partitioned flow Ww2_dem of the second zone is the remaining demand water flow; When A+B≤Ww_dem<C, the first zone is not open, the third zone is set to K1 times full stroke, and the partitioned flow Ww2_dem of the second zone is the remaining demand water flow; When C≤Ww_dem<C+B, the first zone is not open, the third zone is set to full stroke, and the partitioned flow Ww2_dem of the second zone is the remaining demand water flow; When C+B≤Ww_dem, the first zone is set to full stroke, the third zone is set to full stroke, and the partitioned flow Ww2_dem of the second zone is the remaining demand water flow; Mode four: the second zone and the third zone second sensor fault; The first zone and the second zone of mode three are interchanged, and the maximum allowable flow of the first zone and the second zone is interchanged; Mode five: the first zone second sensor and the first zone first sensor fault; When Ww_dem≤B, the first zone water supply control is abandoned, Ww2_dem is set to Ww_dem, and the third zone is not supplied with water; When B<Ww_dem≤A+B, the first zone is set to full stroke, the partitioned flow Ww2_dem of the second zone is the remaining demand water flow, and the third zone is not supplied with water; When A+B<Ww_dem≤B+C, the first zone water supply is abandoned, the second zone is full stroke, and the partitioned flow of the third zone is the remaining demand water flow; When B+C<Ww_dem, the first zone is set to full stroke, the second zone is set to full stroke, and the partitioned flow of the third zone is the remaining demand water flow; Mode six: the second zone second sensor and the second zone first sensor fault The first zone and the second zone of mode five are interchanged; the maximum allowable flow of the first zone and the second zone is interchanged; Mode seven: the third zone second sensor and the third zone first sensor fault The first zone and the third zone of mode five are interchanged; the maximum allowable flow of the first zone and the third zone is interchanged; Mode eight: the second sensor and the first sensor are not in the same water supply partition fault; When the first sensor fails, the PID algorithm takes the middle ring control target as the inner ring control deviation; When the second sensor fails, the PID algorithm takes the middle ring control deviation of the water supply partition with the same partitioned flow as the middle ring control deviation of the water supply partition; Mode nine: sensor combination fault; The bias value Delta_T2 is calculated by the PID algorithm to calculate the control current input I of the third zone electro-hydraulic servo valve, and the current input I controls the opening degree of the outlet valve and further controls the water flow of the outlet.

2. The method of fault-tolerant control of a group of fluidic pre-cooled sensors according to claim 1, wherein, The maximum allowable flow A of the first zone is equal to the maximum allowable flow B of the second zone.

3. The method of fault-tolerant control of a group of fluidic pre-cooled sensors according to claim 1, wherein, The first sensor includes a second sensor for measuring the water pressure of the outlet; the second sensor includes a first sensor for measuring the opening degree of the outlet valve.

4. The method of fault-tolerant control of a group of fluidic pre-cooled sensors as recited in claim 1, wherein, K1 is 0.

65.

5. The method of fault-tolerant control of a group of fluidic pre-cooled sensors as recited in claim 1, wherein, a=A, A+B=b.

6. The method of fault-tolerant control of a fluidic pre-cooled sensor suite according to claim 1, wherein, The PID algorithm includes proportional control, integral control and differential control.

7. The method of fault-tolerant control of a fluidic pre-cooled sensor suite according to claim 1, wherein, The bias value Delta_T2 is calculated by the PID algorithm to calculate the water flow target value Ww_dem.

8. The method of fault-tolerant control of a group of fluidic pre-cooled sensors according to claim 7, wherein, The proportional coefficient, integral constant and differential constant of the PID algorithm in mode nine are obtained by changing the PID algorithm for calculating the water flow target value Ww_dem from the bias value Delta_T2.

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