Measuring circuit and measuring method for aviation fuel consumption

Abstract

The invention provides a measuring circuit and a measuring method for aviation fuel consumption. The measuring circuit comprises an excitation signal generation circuit, an excitation signal power amplification circuit, a consumption signal detection circuit and a consumption signal envelope counting circuit, the excitation signal generation circuit is used for generating a sine wave analog signal and filtering and amplifying the sine wave analog signal; the excitation signal power amplification circuit is used for processing the signal generated by the excitation signal generation circuit so as to increase the current driving capability; the consumption signal detection circuit is used for performing half-wave rectification and envelope detection on an output signal of the consumption sensor; the consumption signal envelope counting circuit is used for processing detected envelopes into square waves, and an FPGA module is used for counting the square waves. The aviation fuel consumption measuring circuit and the aviation fuel consumption measuring method aim at a novel consumption sensor, and the problem that the fuel consumption in the aviation field cannot be collected through the novel consumption sensor is solved.

Description

Technical Field

[0001] The invention relates to the technical field of fuel consumption calculation, and in particular to a measurement circuit and a measurement method for aviation fuel consumption. Background Art

[0002] Aviation fuel consumption (fuel consumption) is a key parameter of an aircraft, and the measurement of fuel consumption is of great significance for monitoring the flight status of an aircraft. At present, the aviation field mostly uses high-reliability turbine flow sensors to measure aircraft fuel consumption, which require the input of a sinusoidal excitation signal and output the consumption information in the form of an amplitude modulated signal. Therefore, it is necessary to output a sinusoidal excitation signal through a dedicated measurement circuit and collect the amplitude modulated signal output by the consumption sensor to calculate the aircraft fuel consumption.

[0003] However, there is currently no measurement circuit for use with the new consumption sensor to measure aviation fuel consumption. Summary of the invention

[0004] In view of this, the embodiments of this specification provide a measurement circuit and a measurement method for aviation fuel consumption, so as to achieve the purpose of accurately measuring fuel consumption in the aviation field.

[0005] The embodiments of this specification provide the following technical solutions:

[0006] A measuring circuit for aviation fuel consumption, comprising:

[0007] Excitation signal generating circuit, excitation signal power amplifying circuit, consumption signal detecting circuit, consumption signal envelope counting circuit;

[0008] The output of the excitation signal generating circuit is connected to the input of the excitation signal power amplifying circuit, the output of the excitation signal power amplifying circuit is connected to the input of the consumption sensor, the input of the consumption signal detecting circuit is connected to the output of the consumption sensor, and the output of the consumption signal detecting circuit is connected to the consumption signal envelope counting circuit;

[0009] The excitation signal generating circuit is used to generate a sine wave analog signal and filter and amplify the sine wave analog signal;

[0010] The excitation signal power amplifier circuit is used to process the signal generated by the excitation signal generating circuit to increase the current driving capability;

[0011] The consumption signal detection circuit is used to perform half-wave rectification and envelope detection on the output signal of the consumption sensor;

[0012] The consumption signal envelope counting circuit is used to process the detected envelope into a square wave and use FPGA to count the square wave.

[0013] Furthermore, the excitation signal generating circuit comprises:

[0014] FPGA module, D / A converter, bandpass filter, and proportional amplifier;

[0015] The FPGA module is connected to one end of the D / A converter, the other end of the D / A converter is connected to one end of the bandpass filter, the other end of the bandpass filter is connected to the input end of the in-phase proportional amplifier N1, and the output end of the in-phase proportional amplifier N1 is connected to the excitation signal power amplifier circuit.

[0016] Furthermore, the bandpass filter comprises:

[0017] A first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second capacitor C2;

[0018] One end of the first resistor R1 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is connected to AGND, the connection between the first capacitor C1 and the first resistor R1 is connected to one end of the second resistor R2 and one end of the second capacitor C2, the other end of the second capacitor C2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to AGND, and the connection between the second capacitor C2 and the third resistor R3 is connected to the input end of the non-inverting proportional amplifier;

[0019] The in-phase proportional amplifier includes a first operational amplifier N1, a fourth resistor R4, and a fifth resistor R5;

[0020] The non-inverting input terminal of the first operational amplifier N1 is connected to the output of the band-pass filter, one end of the fourth resistor R4 is connected to the inverting input terminal of the first operational amplifier N1 and one end of the fifth resistor R5, the other end of the fourth resistor R4 is connected to AGND, and the other end of the fifth resistor R5 is connected to the output terminal of the first operational amplifier N1 and the excitation signal power amplifier circuit.

[0021] Furthermore, the excitation signal power amplification circuit includes:

[0022] Follower circuit and inverting amplifier circuit;

[0023] The follower circuit includes a second operational amplifier N2, a seventh resistor R7 and a ninth resistor R9;

[0024] The non-inverting input terminal of the second operational amplifier N2 is connected to the output of the excitation signal generating circuit, the inverting input terminal of the second operational amplifier N2 is connected to the output of the second operational amplifier N2 through the seventh resistor R7, and the output of the second operational amplifier N2 is connected to the excitation positive terminal of the consumption sensor through the ninth resistor R9;

[0025] The inverting amplifier circuit includes a third operational amplifier N3, a sixth resistor R6, an eighth resistor R8, a tenth resistor R 10 ;

[0026] The non-inverting input terminal of the third operational amplifier N3 is connected to AGND, the inverting input terminal of the third operational amplifier N3 is connected to the output of the excitation signal generating circuit through the sixth resistor R6, the inverting input terminal of the third operational amplifier N3 is connected to the output terminal of the third operational amplifier N3 through the eighth resistor R8, and the output terminal of the third operational amplifier N3 is connected to the output terminal of the third operational amplifier N3 through the tenth resistor R 10 Connect to the negative excitation terminal of the consumption sensor.

[0027] Furthermore, the consumption signal detection circuit includes:

[0028] Detection circuit and common-phase amplifier circuit;

[0029] The detection circuit includes a first diode V1, a fifth capacitor C5 and a sixteenth resistor R 16 ;

[0030] The in-phase amplifier circuit includes a fifth operational amplifier N5, a fifteenth resistor R 15 and the seventeenth resistor R 17 ;

[0031] The output of the consumption sensor is connected to the anode of the first diode V1, and the cathode of the first diode V1 is connected to the non-inverting input terminal of the fifth operational amplifier N5, the fifth capacitor C5 and the sixteenth resistor R 16 , the fifth capacitor C5 and the sixteenth resistor R 16 Connect the other end of the pin to AGND.

[0032] Furthermore, the consumption signal envelope counting circuit includes:

[0033] Hysteresis comparator circuit and FPGA unit;

[0034] The hysteresis comparison circuit includes an eleventh resistor R 11 , the twelfth resistor R 12 、Thirteenth resistor R 13 , the fourteenth resistor R 14 , a fourth capacitor C4, a fourth comparator N4;

[0035] The fourteenth resistor R 14 One end is connected to the output of the consumption signal detection circuit, and the fourteenth resistor R 14 The other end of the thirteenth resistor R 13 One end of the resistor R 13 The other end is connected to the non-inverting input terminal of the fourth comparator N4 and the twelfth resistor R 12 , the twelfth resistor R 12 The other end is connected to the output of the fourth comparator N4, the eleventh resistor R 11 , the fourth capacitor C4 and the IO pin of the FPGA unit, the eleventh resistor R11 The other end of is connected to the power supply, and the other end of the fourth capacitor C4 is connected to AGND.

[0036] A method for measuring aviation fuel consumption, the method uses an aviation fuel consumption measurement circuit to measure aviation fuel consumption, and the measurement method includes:

[0037] The FPGA of the excitation signal generating circuit generates sinusoidal wave data, and the D / A conversion circuit in the excitation signal generating circuit converts the sinusoidal wave data into a sinusoidal wave analog signal. The sinusoidal wave analog signal is then filtered and amplified by the bandpass filter and the inverse proportional amplifier of the excitation signal generating circuit to generate an amplified sinusoidal wave analog signal.

[0038] The sinusoidal wave analog signal with increased current driving capability is output to the consumption sensor through the high current operational amplifier in the excitation signal power amplifier circuit;

[0039] When the fuel flows through the consumption sensor, an amplitude modulated signal containing consumption information is generated. The amplitude modulated signal passes through the consumption signal detection circuit to filter out the high-frequency carrier signal in the amplitude modulated signal to obtain an envelope signal.

[0040] The envelope signal is converted into a square wave signal by a hysteresis comparator of the consumption signal envelope counting circuit, and the square wave signal is counted by FPGA to obtain the square wave signal count value;

[0041] The square wave signal count value is multiplied by the coefficient k through the FPGA of the excitation signal generating circuit to calculate the aviation fuel consumption value, and the aviation fuel consumption value is output.

[0042] Furthermore, the coefficient k is a constant calculated in the experiment.

[0043] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0044] A measurement circuit for aviation fuel consumption of a new type of consumption sensor is proposed, which solves the problem that the new type of consumption sensor cannot be used to collect fuel consumption in the aviation field. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 is a schematic diagram of a circuit for measuring aviation fuel consumption according to an embodiment of the present invention;

[0047] Figure 2 It is a flow chart of the method for measuring aviation fuel consumption according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] like Figure 1 As shown, a circuit for measuring aviation fuel consumption includes:

[0051] Excitation signal generating circuit, excitation signal power amplifying circuit, consumption signal detecting circuit, consumption signal envelope counting circuit;

[0052] The output of the excitation signal generating circuit is connected to the input of the excitation signal power amplifying circuit, the input of the excitation signal power amplifying circuit is connected to the output of the consumption signal detecting circuit, and the output of the consumption signal detecting circuit is connected to the consumption signal envelope counting circuit;

[0053] The excitation signal generating circuit is used to generate a sine wave analog signal and filter and amplify the sine wave analog signal;

[0054] The excitation signal power amplifier circuit is used to process the signal generated by the excitation signal generating circuit to increase the current driving capability;

[0055] The consumption signal detection circuit is used to perform half-wave rectification and envelope detection on the output signal of the consumption sensor;

[0056] The consumption signal envelope counting circuit is used to process the detected envelope into a square wave and use FPGA to count the square wave.

[0057] Specifically, the excitation signal generating circuit includes:

[0058] FPGA module, D / A converter, bandpass filter, and proportional amplifier;

[0059] The FPGA module is connected to one end of the D / A converter, the other end of the D / A converter is connected to one end of the bandpass filter, the other end of the bandpass filter is connected to the input end of the in-phase proportional amplifier, and the output end of the in-phase proportional amplifier is connected to the excitation signal power amplifier circuit.

[0060] Specifically, the bandpass filter includes:

[0061] A first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second capacitor C2;

[0062] One end of the first resistor R1 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is connected to AGND, the connection between the first capacitor C1 and the first resistor R1 is connected to one end of the second resistor R2 and one end of the second capacitor C2, the other end of the second capacitor C2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to AGND, and the connection between the second capacitor C2 and the third resistor R3 is connected to the non-inverting input end of the non-inverting proportional amplifier N1.

[0063] The in-phase proportional amplifier includes a first operational amplifier N1, a fourth resistor R4, and a fifth resistor R5;

[0064] The non-inverting input terminal of the first operational amplifier N1 is connected to the output of the band-pass filter, one end of the fourth resistor R4 is connected to the inverting input terminal of the first operational amplifier N1 and one end of the fifth resistor R5, the other end of the fourth resistor R4 is connected to AGND, and the other end of the fifth resistor R5 is connected to the output terminal of the first operational amplifier N1 and the excitation signal power amplifier circuit.

[0065] The output of the excitation signal generating circuit is connected to the input of the follower circuit and the input of the inverting amplifier circuit of the excitation signal power amplifier circuit. The output of the follower circuit of the excitation signal generating circuit is connected to the positive input of the consumption sensor, and the output of the inverting amplifier circuit is connected to the negative input of the consumption sensor.

[0066] The FPGA module generates sine wave data and sends the data to the D / A converter. The D / A converter generates a 4kHz sine wave analog signal based on the data from the FPGA module. Since the analog signal generated by the D / A converter contains noise, a bandpass filter composed of RC is used to filter the DAC output signal. The 3dB cutoff frequency of the filter is calculated by the following formula:

[0067]

[0068] In formula (1), ω CL is the 3dB cutoff frequency of the low-pass filter. In formula (2), ω CH 3dB cutoff frequency value of the high-pass filter.

[0069] The filtered signal is amplified by a proportional amplifier with a gain of 1+R5 / R4. The peak value of the signal waveform after amplification is 10V.

[0070] Specifically, the excitation signal power amplifier circuit includes:

[0071] Follower circuit and inverting amplifier circuit;

[0072] The follower circuit includes a second operational amplifier N2, a seventh resistor R7 and a ninth resistor R9;

[0073] The non-inverting input terminal of the second operational amplifier N2 is connected to the output of the excitation signal generating circuit, the inverting input terminal of the second operational amplifier N2 is connected to the output of the second operational amplifier N2 through the seventh resistor R7, and the output of the second operational amplifier N2 is connected to the excitation positive terminal of the consumption sensor through the ninth resistor R9;

[0074] The inverting amplifier circuit includes a third operational amplifier N3, a sixth resistor R6, an eighth resistor R8, a tenth resistor R 10 ;

[0075] The non-inverting input terminal of the third operational amplifier N3 is connected to AGND, the inverting input terminal of the third operational amplifier N3 is connected to the output of the excitation signal generating circuit through the sixth resistor R6, the inverting input terminal of the third operational amplifier N3 is connected to the output terminal of the third operational amplifier N3 through the eighth resistor R8, and the output terminal of the third operational amplifier N3 is connected to the output terminal of the third operational amplifier N3 through the tenth resistor R 10 Connect to the negative excitation terminal of the consumption sensor.

[0076] The excitation signal power amplifier circuit uses a large current operational amplifier to process the signal generated by the excitation signal generating circuit to increase the current driving capability. The excitation signal power amplifier circuit outputs to the consumption sensor. When the consumption sensor turbine rotates during fuel consumption, an amplitude modulation signal is generated. The envelope of the amplitude modulation signal contains fuel consumption information.

[0077] Specifically, the consumption signal detection circuit includes:

[0078] Detection circuit and common-phase amplifier circuit;

[0079] The detection circuit includes a first diode V1, a fifth capacitor C5 and a sixteenth resistor R 16 ;

[0080] The in-phase amplifier circuit includes a fifth operational amplifier N5, a fifteenth resistor R 15 and the seventeenth resistor R 17 ;

[0081] The output of the consumption sensor is connected to the anode of the first diode V1, and the cathode of the first diode V1 is connected to the non-inverting input terminal of the fifth operational amplifier N5, the fifth capacitor C5 and the sixteenth resistor R 16 , the fifth capacitor C5 and the sixteenth resistor R 16 Connect the other end of the pin to AGND.

[0082] The output of the consumption sensor is connected to the input of the detection circuit (the anode of the first diode V1), the output of the detection circuit (the cathode of the first diode V1) is connected to the input of the common-mode amplifier circuit (the common-mode input of the fifth operational amplifier N5), and the output of the common-mode amplifier circuit is connected to the consumption signal envelope counting circuit.

[0083] The consumption signal detection circuit is used to perform half-wave rectification and envelope detection on the output signal of the consumption sensor. The first diode V1 charges the fifth capacitor C5 when its output forward voltage is input. Otherwise, the first diode V1 is cut off and the fifth capacitor C5 is connected to the sixteenth resistor R 16 The time constant of the capacitor discharge is the capacitance value of the fifth capacitor C5 multiplied by the sixteenth resistor R 16 The fifth capacitor C5 and the sixteenth resistor R 16 The parameter selection should satisfy:

[0084]

[0085] In formula (3), ω1 is the angular frequency of the carrier signal, ω2 is the angular frequency of the excitation output signal of the consumption detection circuit, and ω2 is the angular frequency of the modulation signal, which is related to the turbine rotation speed of the consumption sensor.

[0086] Specifically, the consumption signal envelope counting circuit includes:

[0087] Hysteresis comparator circuit and FPGA unit;

[0088] The hysteresis comparison circuit includes an eleventh resistor R 11 , the twelfth resistor R 12 、Thirteenth resistor R 13 , the fourteenth resistor R 14 , a fourth capacitor C4, a fourth comparator N4;

[0089] The fourteenth resistor R 14 One end is connected to the output of the consumption signal detection circuit, and the fourteenth resistor R 14 The other end of the thirteenth resistor R 13 One end of the resistor R 13 The other end is connected to the non-inverting input terminal of the fourth comparator N4 and the twelfth resistor R 12 , the twelfth resistor R 12 The other end is connected to the output of the fourth comparator N4, the eleventh resistor R 11 , the fourth capacitor C4 and the IO pin of the FPGA unit, the eleventh resistor R 11 The other end of the fourth capacitor C4 is connected to the power supply, and the other end of the fourth capacitor C4 is connected to AGND.

[0090] The output of the consumption signal detection circuit is connected to the input of the hysteresis comparator circuit (the fourteenth resistor R 14 ), the output of the hysteresis comparator circuit is connected to the IO pin of the FPGA unit.

[0091] The consumption signal envelope counting circuit uses a hysteresis comparator circuit to process the detected envelope into a square wave and uses FPGA to count the square wave. The voltage limit of the hysteresis comparator circuit is calculated by the following formula:

[0092]

[0093] In formula (4), V - is the input voltage when the hysteresis comparator circuit outputs a low level. In formula (5), V + It is the input voltage when the hysteresis comparator circuit outputs a high level.

[0094] The aviation fuel consumption measurement method based on the above measurement circuit is as follows Figure 2 As shown, the following steps are included:

[0095] S1, generating sinusoidal wave data through the FPGA of the excitation signal generating circuit, converting the sinusoidal wave data into a sinusoidal wave analog signal through the D / A conversion circuit, and then filtering and amplifying the sinusoidal wave analog signal through the bandpass filter and the inverse proportional amplifier of the excitation signal generating circuit to generate an amplified sinusoidal wave analog signal;

[0096] S2, outputting the sinusoidal wave analog signal with increased current driving capability to the consumption sensor through the high current operational amplifier in the excitation signal power amplifier circuit, wherein the consumption sensor is an external component;

[0097] S3. When the fuel flows through the consumption sensor, an amplitude modulated signal containing consumption information is generated. The high-frequency carrier signal in the amplitude modulated signal is filtered out by the consumption signal detection circuit to obtain an envelope signal.

[0098] S4, converting the envelope signal into a square wave signal through the hysteresis comparator of the consumption signal envelope counting circuit, counting the square wave signal through the FPGA, and obtaining the square wave signal count value;

[0099] S5. The square wave signal count value is multiplied by the coefficient k through the FPGA of the excitation signal generating circuit to obtain the aviation fuel consumption value, and the aviation fuel consumption value is output to complete the aviation fuel consumption collection. The coefficient k is a constant obtained in the test.

[0100] Beneficial effects of the embodiments of the present invention:

[0101] The sinusoidal wave excitation required for fuel consumption measurement is generated by the excitation signal generating circuit and the excitation signal power amplifying circuit. The consumption signal is conditioned into a square wave signal by the consumption signal detection circuit and the consumption signal envelope counting circuit, and the fuel consumption is calculated by counting the square wave signal. This solves the problem of fuel consumption collection in the aviation field for the new consumption sensor.

[0102] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with each other, and with each other.

Claims

1. A circuit for measuring aviation fuel consumption, characterized in that: include: Excitation signal generating circuit, excitation signal power amplifying circuit, consumption signal detecting circuit, consumption signal envelope counting circuit; The output of the excitation signal generating circuit is connected to the input of the excitation signal power amplifying circuit, the output of the excitation signal power amplifying circuit is connected to the input of the consumption sensor, the input of the consumption signal detection circuit is connected to the output of the consumption sensor, and the output of the consumption signal detection circuit is connected to the consumption signal envelope counting circuit; The excitation signal generating circuit is used to generate a sinusoidal wave analog signal and filter and amplify the sinusoidal wave analog signal; The excitation signal power amplifier circuit is used to process the signal generated by the excitation signal generating circuit to increase the current driving capability; The consumption signal detection circuit is used to perform half-wave rectification and envelope detection on the output signal of the consumption sensor; The consumption signal envelope counting circuit is used to process the detected envelope into a square wave and use the FPGA module to count the square wave.

2. The measurement circuit of aviation fuel consumption according to claim 1, characterized in that: The excitation signal generating circuit comprises: FPGA module, D / A converter, bandpass filter, and proportional amplifier; The FPGA module is connected to one end of the D / A converter, the other end of the D / A converter is connected to one end of the bandpass filter, the other end of the bandpass filter is connected to the input end of the in-direction proportional amplifier, and the output end of the in-direction proportional amplifier is connected to the excitation signal power amplifier circuit.

3. The measurement circuit of aviation fuel consumption according to claim 2, characterized in that: The excitation signal generating circuit comprises: Pass filter and non-inverting proportional amplifier; The pass filter comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second capacitor C2; One end of the first resistor R1 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is connected to AGND, the connection between the first capacitor C1 and the first resistor R1 is connected to one end of the second resistor R2 and one end of the second capacitor C2, the other end of the second capacitor C2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to AGND, and the connection between the second capacitor C2 and the third resistor R3 is connected to the input end of the non-inverting proportional amplifier; The in-phase proportional amplifier includes a first operational amplifier N1, a fourth resistor R4, and a fifth resistor R5; The non-inverting input terminal of the first operational amplifier N1 is connected to the output of the band-pass filter, one end of the fourth resistor R4 is connected to the inverting input terminal of the first operational amplifier N1 and one end of the fifth resistor R5, the other end of the fourth resistor R4 is connected to AGND, and the other end of the fifth resistor R5 is connected to the output terminal of the first operational amplifier N1 and the excitation signal power amplifier circuit.

4. The measurement circuit of aviation fuel consumption according to claim 1, characterized in that: The excitation signal power amplification circuit comprises: Follower circuit and inverting amplifier circuit; The follower circuit includes a second operational amplifier N2, a seventh resistor R7 and a ninth resistor R9; The non-inverting input terminal of the second operational amplifier N2 is connected to the output of the excitation signal generating circuit, the inverting input terminal of the second operational amplifier N2 is connected to the output of the second operational amplifier N2 through the seventh resistor R7, and the output of the second operational amplifier N2 is connected to the excitation positive terminal of the consumption sensor through the ninth resistor R9; The inverting amplifier circuit includes a third operational amplifier N3, a sixth resistor R6, an eighth resistor R8, a tenth resistor R 10 ; The non-inverting input terminal of the third operational amplifier N3 is connected to AGND, the inverting input terminal of the third operational amplifier N3 is connected to the output of the excitation signal generating circuit through the sixth resistor R6, the inverting input terminal of the third operational amplifier N3 is connected to the output terminal of the third operational amplifier N3 through the eighth resistor R8, and the output terminal of the third operational amplifier N3 is connected to the output terminal of the third operational amplifier N3 through the tenth resistor R 10 Connect to the negative excitation terminal of the consumption sensor.

5. The measurement circuit of aviation fuel consumption according to claim 1, characterized in that: The consumption signal detection circuit comprises: Detection circuit and common-phase amplifier circuit; The detection circuit includes a first diode V1, a fifth capacitor C5 and a sixteenth resistor R 16 ; The in-phase amplifier circuit includes a fifth operational amplifier N5, a fifteenth resistor R 15 and the seventeenth resistor R 17 ; The output of the consumption sensor is connected to the anode of the first diode V1, and the cathode of the first diode V1 is connected to the non-inverting input terminal of the fifth operational amplifier N5, the fifth capacitor C5 and the sixteenth resistor R 16 , the fifth capacitor C5 and the sixteenth resistor R 16 Connect the other end of the pin to AGND.

6. The measuring circuit of aviation fuel consumption according to claim 1, characterized in that: The consumption signal envelope counting circuit comprises: Hysteresis comparator circuit and FPGA unit; The hysteresis comparison circuit includes an eleventh resistor R 11 , the twelfth resistor R 12 、Thirteenth resistor R 13 , the fourteenth resistor R 14 , a fourth capacitor C4, a fourth comparator N4; The fourteenth resistor R 14 One end of the fourteenth resistor R is connected to the output of the consumption signal detection circuit. 14 The other end of the thirteenth resistor R 13 One end of the thirteenth resistor R is connected to the reference voltage V_REF. 13 The other end is connected to the non-inverting input terminal of the fourth comparator N4 and the twelfth resistor R 12 , the twelfth resistor R 12 The other end is connected to the output of the fourth comparator N4, the eleventh resistor R 11 , the fourth capacitor C4 and the IO pin of the FPGA unit, the eleventh resistor R 11 The other end of the fourth capacitor C4 is connected to the power supply, and the other end of the fourth capacitor C4 is connected to AGND.

7. A method for measuring aviation fuel consumption, the method using the aviation fuel consumption measurement circuit according to any one of claims 1 to 6 to measure aviation fuel consumption, the method comprising: Generate sine wave data through the FPGA of the excitation signal generating circuit, convert the sine wave data into a sine wave analog signal through the D / A conversion circuit in the excitation signal generating circuit, and then filter and amplify the sine wave analog signal through the bandpass filter and the inverse proportional amplifier N1 of the excitation signal generating circuit to generate an amplified sine wave analog signal; The sinusoidal wave analog signal with increased current driving capability is output to the consumption sensor through the high current operational amplifier in the excitation signal power amplification circuit; When the fuel flows through the consumption sensor, an amplitude modulated signal containing consumption information is generated, and the high-frequency carrier signal in the amplitude modulated signal is filtered out by the consumption signal detection circuit to obtain an envelope signal; The envelope signal is converted into a square wave signal by a hysteresis comparator of the consumption signal envelope counting circuit, and the square wave signal is counted by an FPGA to obtain a square wave signal count value; The square wave signal count value is multiplied by a coefficient k through the FPGA of the excitation signal generating circuit to obtain an aviation fuel consumption value, and the aviation fuel consumption value is output.

8. The method for measuring aviation fuel consumption according to claim 7, characterized in that: The coefficient k is a constant calculated in the experiment.

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