Method for automatically adjusting and controlling fuel flow

Abstract

The invention relates to the technical field of fuel flow regulation, and particularly discloses a fuel flow automatic regulation control method which comprises the following steps: establishing a model of a fuel supply system; pressure adjustment of oil supply is converted into frequency adjustment of a frequency converter and opening adjustment of a servo valve C on an oil return way; flow regulation of main oil and auxiliary oil is converted into opening regulation of a servo valve A on a main oil way and a servo valve B on an auxiliary oil way; after the opening degree of the servo valve A on the main oil way and the opening degree of the servo valve B on the auxiliary oil way are adjusted in place, the energy consumption of a certain combustion chamber in the fuel flow adjusting and changing process can be reduced, the operation efficiency is improved, the operation time is saved, and the operation risk is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fuel flow regulation, in particular to a fuel flow automatic regulation control method. Background Art

[0002] In order to meet the test requirements that the total fuel flow rate can change rapidly at a constant rate to ensure that the engine load adjustment rate remains unchanged during the process of automatic increase and decrease of the flow rate of a single fuel line entering a combustion chamber under the specified time and flow target requirements, and the total fuel flow rate can maintain a constant value when the single fuel flow rate is automatically maintained to ensure the stability of the engine load, and the required control accuracy can be guaranteed during the automatic adjustment process, and the fuel flow automatic adjustment process can be automatically repeated for the required number of times, the fuel supply system adopts an oil pump to deliver oil, and uses a servo valve to adjust the fuel flow through the oil delivery line. Whether the oil pump and servo valve can work normally as required is related to whether the oil supply system can stably provide a target flow of fuel for a combustion chamber. Therefore, the control of the oil pump and servo valve is the key. Considering that manual operation has the problems of cumbersome operation, low efficiency, difficulty in accurately controlling the fuel flow rate, difficulty in mastering the flow adjustment time, and personnel misoperation, higher requirements are put forward for the automatic adjustment control of the fuel flow rate. For this reason, the present invention provides a fuel flow automatic adjustment control method. Summary of the invention

[0003] The purpose of the present invention is to provide a fuel flow automatic regulation control method to solve the problems raised by the above background technology in view of the defects of the prior art.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for automatically adjusting and controlling fuel flow, the specific steps of which are as follows:

[0005] Step 1: Establish a model of the oil supply system, the model includes a main oil circuit, a secondary oil circuit, an oil return circuit, an oil source, an oil pump and a frequency converter, the oil source is connected to the oil pump through a pipeline, the oil pump is connected to the frequency converter, and the oil pump is connected to the main oil circuit, the secondary oil circuit and the oil return circuit respectively;

[0006] Step 2: Convert the oil supply pressure regulation into the frequency regulation of the inverter and the opening regulation of the servo valve C on the oil return line;

[0007] Step 3: Convert the flow regulation of the main oil circuit and the auxiliary oil circuit into the opening regulation of the servo valve A on the main oil circuit and the servo valve B on the auxiliary oil circuit;

[0008] Step 4: After adjusting the openings of servo valve A on the main oil circuit and servo valve B on the auxiliary oil circuit, perform automatic open-loop control and closed-loop control on the opening of servo valve B on the auxiliary oil circuit through the program, and perform closed-loop control on the frequency of the inverter.

[0009] As a preferred technical solution of the present invention, in step 1, the oil source is a fuel storage device, the inlet of the oil pump is connected to the outlet of the oil source through a pipeline; the frequency converter is electrically connected to the oil pump;

[0010] The oil return path is arranged between the outlet of the oil pump and the inlet of the oil source, and both the main oil path and the auxiliary oil path are oil supply paths into the combustion chamber, and are used for single-path oil supply or dual-path oil supply at the same time;

[0011] The main oil circuit is equipped with a flow meter A, a servo valve A, a switch valve A, and a pressure gauge A; the flow meter A is used to detect the flow of the main oil circuit;

[0012] The auxiliary oil circuit is equipped with a flow meter B, a servo valve B, a switch valve B, and a pressure gauge B; the flow meter B is used to detect the flow of the auxiliary oil circuit;

[0013] A pressure gauge C and a servo valve C are installed on the oil return line; the servo valve C is used to adjust the oil return pressure, the servo valve A and the servo valve B are used to adjust the fuel flow entering the combustion chamber; the switch valve A and the switch valve B are used to cut off the fuel entering the combustion chamber;

[0014] A pressure gauge D is also installed on the outlet pipeline of the oil pump; the pressure gauges A, B, C and D are used to detect the internal oil pressure of the oil circuit.

[0015] As a preferred technical solution of the present invention, in step 2, the frequency adjustment of the frequency converter and the opening adjustment of the servo valve C in the oil return circuit are manually controlled by the operator to achieve the oil supply pressure that meets the working conditions. This pressure value is detected by the pressure gauge D.

[0016] As a preferred technical solution of the present invention, in step 3, the opening of the servo valve A on the main oil circuit and the servo valve B on the auxiliary oil circuit are adjusted by manual control by the operator until the oil supply flow rate that meets the working conditions is achieved. This flow value is detected by flowmeter A and flowmeter B.

[0017] As a preferred technical solution of the present invention, in step 4, the expression of the control algorithm for automatic open-loop control adjustment is:

[0018] Yt=Y0+K*Tt

[0019] Wherein, Yt is the real-time opening of servo valve B during the automatic increase and decrease of the auxiliary oil flow, Y0 is the initial opening of servo valve B before the auxiliary oil flow is automatically adjusted, K is the slope during the automatic increase and decrease of the auxiliary oil flow, and Tt is the real-time time during the automatic increase and decrease of the auxiliary oil flow.

[0020] As a preferred technical solution of the present invention, in step 4, the control algorithm for closed-loop control regulation is a PID control algorithm with a dead zone, and the expression is:

[0021]

[0022] In the formula, u p (n) = K p e(n) is the proportional term; is the integral term; is the differential term; u0 is the initial term, n is the current sampling time, u(n) is the output term at the current nth time, T is the total sampling time, T i is the sampling integration time, T d is the sampling differential time, e(n) is the deviation at the nth moment, e(n-1) is the deviation at the n-1th moment, e(i) is the ith sampling input deviation, and e0 is an adjustable parameter, namely the dead zone value. When |e(n)|≤|e0|, the output of the closed-loop control adjustment remains unchanged. When |e(n)|>|e0|, the closed-loop control adjustment takes effect.

[0023] As a preferred technical solution of the present invention, before performing automatic regulation and control of the fuel flow, the target parameters are manually set first, the pressure gauge D sets the target pressure to Pt1, the flow meter B sets the target flow to Ftb, the target opening to Yb, the flow increase time to t1, the flow maintenance time to t2, the flow reduction time to t3, the interval time to t4, and the number of cycles to m.

[0024] As a preferred technical solution of the present invention, automatic operation is performed after the target parameters are manually set, the fuel flow rate is automatically adjusted according to the program, and the entire automatic adjustment process is completed. After the automatic adjustment is completed, the valve positions of servo valve A and servo valve B are maintained, and the fuel flow rate is no longer adjusted.

[0025] As a preferred technical solution of the present invention, the operator can perform an emergency stop operation at any time during the automatic adjustment of the fuel flow rate. At this time, the switch valve A and the switch valve B perform a closing action, the openings of the servo valve A and the servo valve B are fully closed, the frequency of the inverter is set to 0HZ, and the oil pump stops running, so as to improve safety.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1: The present invention can monitor and record in real time during the automatic regulation of fuel flow, realize intelligent regulation of fuel flow, reduce energy consumption, save operation time, and reduce operation risks;

[0028] 2: In actual use, the present invention is convenient for obtaining the proportional, integral and differential parameters of the automatic control adjustment algorithm according to the actual conditions of the frequency converter and the servo valve, and has a manual automatic function, which can be adjusted manually and independently and can be switched to automatic adjustment, thereby improving the reliability of fuel flow regulation;

[0029] 3: The present invention can perform emergency stop operation in both manual and automatic states, thereby improving system safety. The method of the present invention has been verified on a combustion chamber test device and achieved good results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the oil supply system model of the present invention;

[0031] Figure 1 Middle: 1. Main oil circuit; 2. Auxiliary oil circuit; 3. Return oil circuit; 4. Oil source; 5. Oil pump; 6. Pressure gauge D; 7. Frequency converter; 101. Flow meter A; 102. Servo valve A; 103. Switch valve A; 104. Pressure gauge A; 201. Flow meter B; 202. Servo valve B; 203. Switch valve B; 204. Pressure gauge B; 301. Pressure gauge C; 302. Servo valve C;

[0032] Figure 2 is a flow chart of the control method of the present invention;

[0033] Figure 3 The figure is a rendering of the experimental verification of the method of the present invention.

[0034] Figure 3 In the figure: AA represents the flow value of flow meter B; BB represents the valve position feedback value of servo valve B; CC represents the flow value of flow meter A; DD represents the pressure value of pressure gauge D.

[0035] Figure 4 It is a real-time graph of fuel flow rate in a certain period of time. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0037] Example: See Figure 1-2 The present invention provides a technical solution: a fuel flow automatic regulation control method, the specific steps are as follows:

[0038] Step 1: Establish a model of the oil supply system, which includes a main oil circuit 1, a secondary oil circuit 2, an oil return circuit 3, an oil source 4, an oil pump 5 and a frequency converter 7. The oil source 4 is connected to the oil pump 5 through a pipeline, and the oil pump 5 is connected to the frequency converter 7. The oil pump 5 is respectively connected to the main oil circuit 1, the secondary oil circuit 2 and the oil return circuit 3;

[0039] The oil source 4 is a fuel storage device, the oil pump is a direct power source for supplying oil, and the inlet of the oil pump 5 is connected to the outlet of the oil source 4 through a pipeline; the frequency converter is a power source for controlling the oil pump, and the frequency converter 7 is electrically connected to the oil pump 5;

[0040] The oil return path 3 is arranged between the outlet of the oil pump 5 and the inlet of the oil source 4. The main oil path 1 and the auxiliary oil path 2 are both oil supply paths into the combustion chamber, and are used for single-path oil supply or dual-path oil supply at the same time.

[0041] The main oil circuit 1 is equipped with a flow meter A101, a servo valve A102, a switch valve A103, and a pressure gauge A104; the flow meter A101 is used to detect the flow of the main oil circuit 1;

[0042] A flow meter B201, a servo valve B202, a switch valve B203, and a pressure gauge B204 are installed on the auxiliary oil circuit 2; the flow meter B201 is used to detect the flow of the auxiliary oil circuit 2;

[0043] A pressure gauge C301 and a servo valve C302 are installed on the oil return line 3; the servo valve C302 is used to adjust the oil return pressure, the servo valve A102 and the servo valve B202 are used to adjust the fuel flow entering the combustion chamber; the switch valve A103 and the switch valve B203 are used to cut off the fuel entering the combustion chamber;

[0044] A pressure gauge D6 is also installed on the outlet pipeline of the oil pump 5; the pressure gauge A104, the pressure gauge B204, the pressure gauge C301 and the pressure gauge D6 are used to detect the internal oil pressure of the oil circuit;

[0045] Step 2: Convert the pressure regulation of the oil supply into the frequency regulation of the frequency converter 7 and the opening regulation of the servo valve C302 on the oil return line 3;

[0046] The specific principle is: the frequency adjustment of the frequency converter 7 is converted into the motor speed adjustment of the oil pump 5, and the motor speed of the oil pump 5 is approximately linearly proportional to the output oil pressure of the oil pump 5, and the opening adjustment of the servo valve C302 can adjust the return oil pressure. The combination of the two can meet the oil supply pressure requirements of the main oil circuit 1 and the auxiliary oil circuit 2; the frequency adjustment of the frequency converter 7 and the opening adjustment of the servo valve C302 on the return oil circuit 3 are manually controlled by the operator until the oil supply pressure that meets the working condition requirements is reached. This pressure value is detected by the pressure gauge D6;

[0047] Step 3: Convert the flow rate regulation of the main oil circuit and the auxiliary oil circuit into the opening adjustment of the servo valve A102 on the main oil circuit 1 and the servo valve B202 on the auxiliary oil circuit 2;

[0048] The opening of the servo valve A102 on the main oil circuit 1 and the servo valve B202 on the auxiliary oil circuit 2 is manually controlled by the operator to achieve the oil supply flow that meets the working condition requirements. This flow value is detected by the flow meter A101 and the flow meter B201;

[0049] Step 4: After adjusting the openings of the servo valve A102 on the main oil circuit 1 and the servo valve B202 on the auxiliary oil circuit 2, the opening of the servo valve B202 of the auxiliary oil circuit 2 is automatically open-loop controlled and closed-loop controlled through the program, and the frequency of the inverter 7 is closed-loop controlled.

[0050] The closed-loop control adjustment of the frequency of the frequency converter 7 is to reduce the interference caused by the instability of the front-end fuel supply pressure during the automatic adjustment of the flow of the auxiliary oil circuit 2. Constant pressure fuel supply is a prerequisite for the automatic adjustment of the fuel flow;

[0051] Before the automatic regulation and control of the fuel flow is performed, the operator manually sets the target parameters, wherein the pressure gauge D6 sets the target pressure to Pt1, the flow meter B201 sets the target flow to Ftb, the target opening Yb, the flow increase time t1, the flow maintenance time t2, the flow reduction time t3, the interval time t4, the number of cycles m and other parameters, wherein the target opening Yb can be obtained from the flow characteristic curve of the servo valve B202, and this flow characteristic curve can be verified and recorded by the operator during manual adjustment, and the values ​​of t1, t2 and t3 are not less than 30 seconds;

[0052] The expression of the control algorithm for automatic open-loop control regulation is:

[0053] Yt=Y0+K*Tt

[0054] Wherein, Yt is the real-time opening of the servo valve B202 during the process of automatic increase and decrease of the flow of the auxiliary oil circuit 2, Y0 is the initial opening of the servo valve B202 before the flow of the auxiliary oil circuit 2 is automatically adjusted, K is the slope during the process of automatic increase and decrease of the flow of the auxiliary oil circuit 2, and Tt is the real-time time during the process of automatic increase and decrease of the flow of the auxiliary oil circuit 2;

[0055] The target opening Yb value is greater than the value of Y0, that is, the target opening of the servo valve B202 is greater than the initial opening;

[0056] In the formula, the value of Tt can be calculated based on the timing instructions of the program and the values ​​of t1, t2 and t3. Assuming that the slope of the flow of auxiliary oil circuit 2 during the automatic increase process is K1, since the values ​​of t1, Y0 and Yb are known, then K1 = (Yb-Y0) / t1, so the real-time opening Yt1 of the servo valve B202 during the automatic increase of the flow of auxiliary oil circuit 2 can be calculated, and its expression is:

[0057] Yt1=Y0+K1*Tt

[0058] The program calculates a new real-time opening Yt1 every 1 second and assigns it to the opening setting value of the servo valve B202 until t1 ends;

[0059] When the automatic increase process of the flow rate in the auxiliary oil circuit 2 ends, that is, after t1 ends, it enters the automatic maintenance process. At this time, the opening of the servo valve B202 is adjusted by the closed-loop control in step 4. The control algorithm of the closed-loop control adjustment is the PID control algorithm with a dead zone, and the expression is:

[0060]

[0061] In the formula, u p (n) = K p e(n) is the proportional term; is the integral term; is the differential term; u0 is the initial term, n is the current sampling time, n = 1, 2, 3, 4..., u(n) is the output term at the current nth time, T is the total sampling time, T i is the sampling integration time, T d is the sampling differential time, e(n) is the deviation at the nth moment, e(n-1) is the deviation at the n-1th moment, e(i) is the ith sampling input deviation, and the deviation value of the flow in the auxiliary oil circuit 2 is obtained by subtracting the set target flow Ftb from the real-time value of the flow meter B201, and the deviation value of the oil supply pressure is obtained by subtracting the set target pressure Pt1 from the real-time value of the pressure gauge D6. e0 is an adjustable parameter, i.e., the dead zone value. The values ​​of e(n) and e0 determine whether the closed-loop control regulation works. The specific value of e0 is determined according to the actual control situation. The actual control effect is good when e0 is 0.1. When |e(n)|≤|e0|, the output of the closed-loop control regulation maintains a certain fixed value. At this time, the frequency given value of the frequency converter 7 and the opening given value of the servo valve B202 remain unchanged. When |e(n)|>|e0|, the closed-loop control regulation works. At this time, the value of the output item u(n) is assigned to the frequency given value of the frequency converter 7 and the opening given value of the servo valve B202 until |u(n)|≤0.1. When the opening given value of the servo valve B202 remains unchanged after 5 seconds, it can be considered that the auxiliary oil flow is automatically maintained. At this time, the opening value of the servo valve B202 is recorded as y.

[0062] When the automatic maintenance process of the flow of the auxiliary oil circuit 2 ends, that is, after t2 ends, it enters the reduction process. Assuming that the slope of the flow of the auxiliary oil circuit 2 during the automatic reduction process is K2, that is, the opening value of the servo valve B202 at the end of t2 is y, since the values ​​of t3, Y0 and y are known, then K2 = (Y0-y) / tt, so the real-time opening Yt2 of the servo valve B202 during the automatic reduction process of the flow of the auxiliary oil circuit 2 can be calculated, and its expression is:

[0063] Yt2=Y0+K2*Tt

[0064] The program calculates a new real-time opening Yt2 every 1 second and assigns it to the opening setting value of the servo valve B202 until t3 ends;

[0065] When the automatic reduction process of the flow in auxiliary oil circuit 2 is completed, that is, after t3, it enters the fuel flow adjustment interval, that is, it enters the interval time t4. At this time, the opening of servo valve A102 and servo valve B202 remains unchanged. After t4, the entire fuel flow automatic adjustment process begins to be repeated, that is, the flow in auxiliary oil circuit 2 starts to automatically increase, automatically maintain, and automatically decrease for the second time and waits for the interval time t4 to automatically enter the third cycle process, and so on, until the number of cycle repetitions is equal to the target number of cycles m, then exit the entire automatic adjustment process and keep the valve position unchanged.

[0066] In summary, the present invention realizes that in the process of automatic addition and subtraction of a single-channel fuel flow rate under the specified time and flow target requirements, the total fuel flow rate changes rapidly at a constant rate and the total fuel flow rate can maintain a constant value when the single-channel fuel flow rate is automatically maintained through the open-loop and closed-loop control flow of the auxiliary oil circuit 2 and the double-circuit closed-loop control pressure, and meets the control accuracy requirements during the automatic adjustment process, and can repeat the entire fuel flow adjustment process multiple times to verify the carbon deposition performance of a fuel nozzle in a combustion chamber, and at the same time can verify the reliability of the control method of the present invention. The method of the present invention can reduce energy consumption, improve operating efficiency, save operating time, reduce operating risks, and provide a control reference for a combustion chamber to conduct a fuel variable flow combustion test and a fuel nozzle carbon deposition performance test.

[0067] from Figure 3 It can be seen that the control effect achieved by the method of the present invention is good; Figure 3 There are time axis marks at the bottom, among which 15:18-15:19 is the flow increase stage of auxiliary oil circuit 2, 15:19-15:21 is the flow maintenance stage of auxiliary oil circuit 2, 15:21-15:22 is the flow reduction stage of auxiliary oil circuit 2, 15:22-15:22:30 is the flow interval stage of auxiliary oil circuit 2, and then the second flow automatic adjustment cycle process begins to repeat. Figure 3 There are three automatic cycles. Figure 3 It can be seen that after 15:21:55, the flow rate of auxiliary oil circuit 2 is reduced to 0g, which is 10 seconds earlier than the opening of servo valve B202 returns to the initial value. This is required according to a specific test condition and does not affect the feasibility of the method of the present invention. Figure 3The curves of the flow rate in the main oil circuit 1 (the flow rate value of flowmeter A) and the oil supply pressure (the pressure value of pressure gauge D) fluctuate very little, proving the stability of the main oil circuit flow rate and the oil supply pressure, thereby verifying the feasibility of the method of the present invention.

[0068] Figure 4 It is a real-time curve diagram of fuel flow rate at a certain period of time during the actual test;

[0069] from Figure 4 The accuracy and stability of the fuel flow rate trend change can be seen in the figure. The main oil circuit flow rate (blue line) is basically maintained at 9.6g, and the auxiliary oil circuit flow rate (red line) is basically maintained at 17.1g in the maintenance stage. The slope of the curve of the auxiliary oil circuit flow rate is stable and uniform in the increase and decrease stages, and the fuel supply pressure (yellow line) can be maintained at 2.0MPa with basically no fluctuation, thereby verifying the feasibility of the method of the present invention. The test effect is good, and the test purpose requirements mentioned in the background technology of the present invention are met.

[0070] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A fuel flow automatic regulation control method, characterized in that: The specific steps are as follows: Step 1: Establish a model of the oil supply system, the model comprising a main oil circuit (1), a secondary oil circuit (2), an oil return circuit (3), an oil source (4), an oil pump (5) and a frequency converter (7), the oil source (4) and the oil pump (5) are connected via a pipeline, the oil pump (5) is connected to the frequency converter (7), and the oil pump (5) is respectively connected to the main oil circuit (1), the secondary oil circuit (2) and the oil return circuit (3); Step 2: converting the pressure regulation of the oil supply into the frequency regulation of the frequency converter (7) and the opening regulation of the servo valve C (302) on the oil return line (3); Step 3: converting the flow rate regulation of the main oil circuit (1) and the auxiliary oil circuit (2) into the opening regulation of the servo valve A (102) on the main oil circuit (1) and the servo valve B (202) on the auxiliary oil circuit (2); Step 4: After the openings of the servo valve A (102) on the main oil circuit (1) and the servo valve B (202) on the auxiliary oil circuit (2) are adjusted to the desired position, the opening of the servo valve B (202) on the auxiliary oil circuit (2) is automatically adjusted by open-loop control and closed-loop control through a program, and the frequency of the frequency converter (7) is adjusted by closed-loop control.

2. The fuel flow automatic regulation control method according to claim 1, characterized in that: In step 1, the oil source (4) is a fuel storage device, the inlet of the oil pump (5) is connected to the outlet of the oil source (4) through a pipeline; the frequency converter (7) is electrically connected to the oil pump (5); The oil return path (3) is arranged between the outlet of the oil pump (5) and the inlet of the oil source (4); the main oil path (1) and the auxiliary oil path (2) are both oil supply paths to the combustion chamber, and are used for single-path oil supply or dual-path oil supply at the same time; The main oil circuit (1) is equipped with a flow meter A (101), a servo valve A (102), a switch valve A (103), and a pressure gauge A (104); the flow meter A (101) is used to detect the flow rate of the main oil circuit; The auxiliary oil circuit (2) is provided with a flow meter B (201), a servo valve B (202), a switch valve B (203), and a pressure gauge B (204); the flow meter B (201) is used to detect the flow rate of the auxiliary oil circuit; The oil return line (3) is provided with a pressure gauge C (301) and a servo valve C (302); the servo valve C (302) is used to adjust the oil return pressure, the servo valve A (102) and the servo valve B (202) are used to adjust the fuel flow entering the combustion chamber; the switch valve A (103) and the switch valve B (203) are used to cut off the fuel entering the combustion chamber; A pressure gauge D (6) is also installed on the outlet pipeline of the oil pump (5); the pressure gauge A (104), the pressure gauge B (204), the pressure gauge C (301) and the pressure gauge D (6) are used to detect the internal oil pressure of the oil circuit.

3. The fuel flow automatic regulation control method according to claim 1, characterized in that: In step 2, the frequency adjustment of the frequency converter (7) and the opening adjustment of the servo valve C (302) of the oil return line (3) are manually controlled by the operator until the oil supply pressure that meets the working condition requirements is reached. This pressure value is detected by the pressure gauge D (6).

4. The fuel flow automatic regulation control method according to claim 1, characterized in that: In step 3, the opening of the servo valve A (102) on the main oil circuit (1) and the servo valve B (202) on the auxiliary oil circuit (2) is adjusted by manual control by the operator until the oil supply flow rate that meets the working condition requirements is achieved. This flow rate value is detected by the flow meter A (101) and the flow meter B (201).

5. The fuel flow automatic regulation control method according to claim 2, characterized in that: In step 4, the expression of the control algorithm for automatic open-loop control adjustment is: Yt=Y0+K*Tt Wherein, Yt is the real-time opening of the servo valve B (202) during the process of automatic increase and decrease of the flow rate of the auxiliary oil circuit (2), Y0 is the initial opening of the servo valve B (202) before the flow rate of the auxiliary oil circuit (2) is automatically adjusted, K is the slope during the process of automatic increase and decrease of the flow rate of the auxiliary oil circuit (2), and Tt is the real-time time during the process of automatic increase and decrease of the flow rate of the auxiliary oil circuit (2).

6. The fuel flow automatic regulation control method according to claim 5, characterized in that: In step 4, the control algorithm for closed-loop control adjustment is a PID control algorithm with a dead zone, and the expression is: In the formula, u p (n) = K p e(n) is the proportional term; is the integral term; is the differential term; u0 is the initial term, n is the current sampling time, u(n) is the output term at the current nth time, T is the total sampling time, T i is the sampling integration time, T d is the sampling differential time, e(n) is the deviation at the nth moment, e(n-1) is the deviation at the n-1th moment, e(i) is the ith sampling input deviation, and e0 is an adjustable parameter, namely the dead zone value. When |e(n)|≤|e0|, the output of the closed-loop control adjustment remains unchanged. When |e(n)|>|e0|, the closed-loop control adjustment takes effect.

7. The fuel flow automatic regulation control method according to claim 6, characterized in that: In step 4, before the automatic regulation and control of the fuel flow is performed, the target parameters are manually set. The pressure gauge D (6) sets the target pressure to Pt1, the flow meter B (201) sets the target flow to Ftb, the target opening to Yb, the flow increase time to t1, the flow maintenance time to t2, the flow reduction time to t3, the interval time to t4, and the number of cycles to m.

8. The fuel flow automatic regulation control method according to claim 7, characterized in that: After the target parameters are manually set, the automatic operation is performed, and the fuel flow rate is automatically adjusted according to the program and the entire automatic adjustment process is completed. After the automatic adjustment is completed, the valve positions of the servo valve A (102) and the servo valve B (202) are maintained, and the fuel flow rate is no longer adjusted.

9. The method for automatically adjusting and controlling fuel flow according to claim 8, characterized in that: The operator can perform an emergency stop operation at any time during the automatic adjustment of the fuel flow rate. At this time, the switch valve A (103) and the switch valve B (203) perform a closing action, the opening of the servo valve A (102) and the servo valve B (202) are fully closed, the frequency of the inverter (7) is set to 0 Hz, and the oil pump (5) stops running.

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