An engine throttle lever position signal acquisition device and acquisition platform

Abstract

The embodiment of the specification provides an engine throttle lever position signal acquisition device, comprising a signal conditioning unit and a CPU processing unit, wherein the signal conditioning unit comprises an angular displacement signal conversion circuit, a configuration circuit, a filter circuit, a voltage conditioning circuit, an A / D conversion circuit and a reference source circuit; the angular displacement signal conversion circuit is used for providing a differential excitation sinusoidal signal for an angular displacement sensor and converting a three-wire sinusoidal voltage signal output by the angular displacement sensor into a single-ended direct current voltage signal, outputting the differential excitation sinusoidal signal to the angular displacement sensor, and outputting the single-ended direct current voltage signal to the filter circuit; the configuration circuit; the filter circuit; the voltage conditioning circuit; the reference source circuit is used for providing a reference voltage of the A / D conversion circuit; the A / D conversion circuit; the CPU processing unit is used for demodulating digital signals to obtain angular displacement information. Through analyzing the working principle of the angular displacement sensor, the engine throttle lever position signal acquisition device is designed, and high-precision real-time measurement of the position information of the aero-engine throttle lever can be realized.

Description

TECHNICAL FIELD

[0001] The present specification relates to the technical field of signal acquisition, in particular to an engine throttle lever position signal acquisition device and an acquisition platform. BACKGROUND

[0002] The engine throttle lever position information is an important parameter of the airborne engine control system. With the rapid development of modern sensing technology, various sensors are increasingly widely used in industry. The rotary variable differential transformer belongs to an angular displacement sensor, which is a key device of the modern fly-by-wire flight control system, used to convert the displacement signals of the cockpit pilot and the rudder surface movement signals into electrical signals, and has the advantages of high sensitivity, good linearity, and high reliability. In the position automatic measurement and control system, a microcomputer or a DSP is usually used to process the displacement signals. The research on high-precision measurement technology of angular displacement sensor signals plays an important role in analyzing the real-time change state of the engine throttle lever position. SUMMARY

[0003] Therefore, the present specification provides an engine throttle lever position signal acquisition device and an acquisition platform to achieve the purpose of analyzing the working principle of the airborne throttle lever position sensor, designing a throttle lever position acquisition system, and building a throttle lever position simulation test platform for angular displacement measurement and analysis.

[0004] The present specification provides the following technical solutions:

[0005] An engine throttle lever position signal acquisition device, comprising:

[0006] a signal conditioning unit and a CPU processing unit, wherein the signal conditioning unit comprises:

[0007] an angular displacement signal conversion circuit, a configuration circuit, a filter circuit, a voltage conditioning circuit, an A / D conversion circuit, and a reference source circuit;

[0008] The angular displacement signal conversion circuit is configured to provide a differential excitation sinusoidal signal for the angular displacement sensor and convert a three-wire sinusoidal voltage signal output by the angular displacement sensor into a single-ended direct current voltage signal, output the differential excitation sinusoidal signal to the angular displacement sensor, and output the single-ended direct current voltage signal to the filter circuit.

[0009] The configuration circuit is configured to configure the resistance value of the internal resistance of the configuration circuit, and adjust the excitation signal voltage, the full-scale output voltage, and the output bias voltage in the angular displacement signal conversion circuit, respectively.

[0010] The filter circuit is configured to filter the single-ended direct current voltage signal output by the angular displacement signal conversion circuit and output a filtered voltage signal.

[0011] a voltage conditioning circuit for conditioning the filtered voltage signal generated by the filter circuit into a direct current voltage signal satisfying the AD range and outputting the direct current voltage signal satisfying the AD range;

[0012] a reference source circuit for providing a reference voltage for the A / D conversion circuit;

[0013] an A / D conversion circuit for converting the direct current voltage signal satisfying the AD range into a digital signal using the A / D conversion reference voltage generated by the reference source circuit and outputting the digital signal;

[0014] a CPU processing unit for demodulating the digital signal to obtain angular displacement information.

[0015] Further, the angular displacement signal conversion circuit comprises:

[0016] an input positive power terminal, a negative excitation terminal, a positive excitation terminal, a feedback signal V A terminal, a feedback signal V B terminal, a feedback signal V MID terminal, a ground terminal, a monolithic linear displacement differential transformer signal conditioning chip, a short-circuit resistor R1, an input negative power terminal, an excitation signal voltage configuration resistor RR1, a full-scale output voltage configuration resistor RR2, a bias voltage configuration resistor RR3, an excitation signal frequency configuration capacitor C3, a filter capacitor C1 and a filter capacitor C2;

[0017] The monolithic linear displacement differential transformer signal conditioning chip is used to realize the functions of generating an excitation signal of an angular displacement sensor and conditioning a feedback signal of the angular displacement sensor into a single-ended direct current voltage signal. The monolithic linear displacement differential transformer signal conditioning chip comprises a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal, a ninth terminal, a tenth terminal, an eleventh terminal, a twelfth terminal, a thirteenth terminal and a fourteenth terminal.

[0018] The first terminal is connected with an input positive power terminal and a first end of a filter capacitor C1; the second terminal is connected with a negative excitation terminal; the third terminal is connected with a positive excitation terminal; the fourth terminal is connected with a feedback signal V A terminal; the fifth terminal is connected with a feedback signal V BThe sixth terminal is connected with a ground terminal; the seventh terminal is connected with an input negative power supply terminal and a first terminal of a filter capacitor C2; the eighth terminal is connected with a first terminal of an excitation signal voltage configuration resistor RR1; the ninth terminal is connected with a second terminal of the excitation signal voltage configuration resistor RR1; the tenth terminal is connected with a second terminal of a full-scale output voltage configuration resistor RR2 and a first terminal of a voltage dividing resistor R2; the eleventh terminal is connected with a first terminal of the full-scale output voltage configuration resistor RR2; the twelfth terminal is connected with a first terminal of a bias voltage configuration resistor RR3; the thirteenth terminal is connected with a first terminal of an excitation signal frequency configuration capacitor C3; the fourteenth terminal is connected with a second terminal of the excitation signal frequency configuration capacitor C3; a feedback signal V MID The terminal is connected with a first terminal of a short-circuit resistor R1; a second terminal of the short-circuit resistor R1 is grounded; a second terminal of the bias voltage configuration resistor RR3 is grounded.

[0019] A first terminal of a filter capacitor C1 is connected with the first terminal, and a first terminal of a filter capacitor C2 is connected with the seventh terminal; the second terminal of the filter capacitor C1 and the second terminal of the filter capacitor C2 are both grounded; the filter capacitor C1 is used for filtering a +15V working power supply, and the filter capacitor C2 is used for filtering a -15V working power supply.

[0020] Further, the feedback signal V A The terminal is connected with a V A The terminal is connected with a feedback signal V B The terminal is connected with a V B The terminal is connected with a feedback signal V A The terminal is connected with a feedback signal V B The terminal is connected with a feedback signal V MID The terminal is used for receiving a three-wire sine signal fed back by the angular displacement sensor.

[0021] Further, the excitation signal voltage configuration resistor RR1 is used for adjusting the amplitude of the excitation signal voltage, and the resistance value of the excitation signal voltage configuration resistor RR1 is 10kΩ to 30kΩ.

[0022] Further, the excitation signal frequency configuration capacitor C3 is used for adjusting the frequency of the excitation signal, and the excitation signal frequency configuration capacitor C3 is calculated by the formula C3=35μF / F EXC , wherein F EXC is the frequency of the excitation signal.

[0023] Further, the full-scale output voltage configuration resistor RR2 is used for adjusting the full-scale output voltage, and the full-scale output voltage configuration resistor RR2 is calculated by the formula , wherein V OUT is the full-scale output voltage, S is the sensitivity of the angular displacement sensor, and d is the maximum working range.

[0024] Further, the bias voltage configuration resistance RR3 is calculated by the formula , wherein V OS is the bias voltage.

[0025] Further, the filter circuit is used for filtering the single-ended DC voltage signal, comprising:

[0026] The voltage dividing resistance R2 and the filter capacitor C4;

[0027] The first end of the voltage dividing resistance R2 is connected with the output end of the angular displacement signal conversion circuit, the second end of the voltage dividing resistance R2 and the first end of the filter capacitor C4 are both connected with the output end of the voltage conditioning circuit, and the second end of the filter capacitor C4 is grounded.

[0028] Further, the voltage conditioning circuit conditions the single-ended DC voltage into the range of the back-end analog-to-digital converter, comprising:

[0029] The output end of the voltage dividing resistance R2, the voltage dividing resistance R3 and the voltage conditioning circuit;

[0030] The first end of the voltage dividing resistance R3 is connected with the output end of the voltage conditioning circuit, and the second end of the voltage dividing resistance R3 is grounded.

[0031] The output end of the voltage conditioning circuit comprises an output terminal, and the output terminal is used for outputting the conditioned DC voltage.

[0032] Further, the collection platform of the engine throttle lever position signal collection device, comprising:

[0033] The precise grating optical dividing head, the displacement sensor test table, the angular displacement sensor, the engine throttle lever position signal collection device and the digital table;

[0034] The precise grating optical dividing head is connected with the displacement sensor test table, the angular displacement sensor is coaxially connected with the locking shaft of the displacement sensor test table, the tail connector of the angular displacement sensor is connected with the angular displacement signal conversion circuit of the engine throttle lever position signal collection device through a lead wire, and the digital table is connected with the output end of the engine throttle lever position signal collection device.

[0035] Compared with the prior art, the above at least one technical scheme adopted by the embodiment of the present specification can achieve at least the following beneficial effects:

[0036] By analyzing the working principle of the angular displacement sensor, the collection device of the engine throttle lever position signal is designed, and high-precision real-time measurement of the aviation engine throttle lever position information can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0038] Figure 1 is the overall structure diagram of the engine throttle lever position signal acquisition device of the embodiment of the present application;

[0039] Figure 2 is the circuit structure diagram of the engine throttle lever position signal acquisition device of the embodiment of the present application;

[0040] Figure 3 is the schematic diagram of the connection of circuit elements of the engine throttle lever position signal acquisition device of the embodiment of the present application;

[0041] Figure 4 is the schematic diagram of the acquisition platform of the engine throttle lever position signal of the embodiment of the present application;

[0042] Figure 5 is the relationship curve of the conversion of direct current voltage and throttle lever angular displacement of the No.1 plate of the embodiment of the present application;

[0043] Figure 6 is the relationship curve of the conversion of direct current voltage and throttle lever angular displacement of the No.2 plate of the embodiment of the present application;

[0044] Figure 7 is the relationship curve of the conversion of direct current voltage and throttle lever angular displacement of the No.3 plate of the embodiment of the present application;

[0045] Figure 8 is the relationship curve of the acquisition voltage error and throttle lever angular displacement of the No.1 plate of the embodiment of the present application;

[0046] Figure 9 is the relationship curve of the acquisition voltage error and throttle lever angular displacement of the No.2 plate of the embodiment of the present application;

[0047] Figure 10 is the relationship curve of the acquisition voltage error and throttle lever angular displacement of the No.3 plate of the embodiment of the present application;

[0048] Figure 11 is the schematic diagram of the acquisition result of the throttle lever angular displacement of the DSP system of the embodiment of the present application;

[0049] Figure 12 is the consistency comparison diagram of the throttle lever angular displacement measurement system of the embodiment of the present application.

[0050] Explanation of reference numerals: 1, input positive power terminal; 2, negative excitation terminal; 3, positive excitation terminal; 4, feedback signal V ATerminal; 5. Feedback signal V B Terminals; 6. Feedback signal V MID Terminals; 7. Ground terminal; 8. Filter capacitor bank; 801. Filter capacitor C1; 802. Filter capacitor C2; 9. Monolithic linear displacement differential transformer signal conditioning chip; 901. First terminal; 902. Second terminal; 903. Third terminal; 904. Fourth terminal; 905. Fifth terminal; 906. Sixth terminal; 907. Seventh terminal; 908. Eighth terminal; 909. Ninth terminal; 910. Tenth terminal; 911. Eleventh terminal; 912. Twelfth terminal; 913. Thirteenth terminal; 914. Fourteenth terminal; 10. Shorting resistor R1; 11. Input negative power supply terminal; 12. Excitation signal voltage configuration resistor RR1; 13. Full-scale output voltage configuration resistor RR2; 14. Bias voltage configuration resistor RR3; 15. Excitation signal frequency configuration capacitor C3; 16. Voltage divider resistor R2; 17. Voltage divider resistor R3; 18. Filter capacitor C4; 19. Output terminal. Detailed Implementation

[0051] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0052] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0054] It is also need to be explained that the figures provided in the following embodiments only illustrate the basic concept of the present application in a schematic way, and only the components related to the present application are shown in the figures, not the number, shape and size of the components when actually implemented, the shape, number and ratio of the components when actually implemented can be a random change, and the component layout pattern can also be more complex.

[0055] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, one skilled in the art will understand that the described aspects can be practiced without these specific details.

[0056] The technical solutions provided by the embodiments of the present application are described below in combination with the drawings.

[0057] As shown in Figure 1 An engine throttle lever position signal acquisition device, comprising: a signal conditioning unit and a CPU processing unit, wherein the signal conditioning unit comprises: an angular displacement signal conversion circuit, a configuration circuit, a filter circuit, a voltage conditioning circuit, an A / D conversion circuit and a reference source circuit.

[0058] Specifically, the signal conditioning unit collects and processes the three-wire sinusoidal analog signal output by the angular displacement sensor.

[0059] The angular displacement signal conversion circuit is configured to provide a differential excitation sinusoidal signal for the angular displacement sensor and convert the three-wire sinusoidal voltage signal output by the angular displacement sensor into a single-ended DC voltage signal, output the differential excitation sinusoidal signal to the angular displacement sensor, and output the single-ended DC voltage signal to the filter circuit.

[0060] Specifically, the angular displacement signal conversion circuit provides a pair of differential sinusoidal excitation signals for the angular displacement sensor and converts the three-wire sinusoidal signal output by the sensor into a single-ended DC voltage signal.

[0061] The configuration circuit is configured to configure the resistance value of the internal resistance of the configuration circuit, and adjust the excitation signal voltage, full-scale output voltage and output bias voltage in the angular displacement signal conversion circuit, respectively.

[0062] Specifically, by adjusting the configuration circuit, the configuration of the excitation signal frequency and amplitude, the full-scale output voltage and the output bias voltage can be realized.

[0063] The filter circuit is configured to filter the single-ended DC voltage signal output by the angular displacement signal conversion circuit and output the filtered voltage signal.

[0064] Specifically, the voltage signal output by the angular displacement signal conversion circuit is filtered by the filter circuit, and then the filtered voltage is conditioned to the acquisition range of the A / D converter by the voltage conditioning circuit.

[0065] a voltage conditioning circuit for conditioning the filtered voltage signal generated by the filter circuit into a direct current voltage signal satisfying the AD range, and outputting the direct current voltage signal satisfying the AD range;

[0066] a reference source circuit for providing a reference voltage for the A / D conversion circuit, and the A / D conversion circuit for converting the direct current voltage signal satisfying the AD range into a digital signal by using the A / D conversion reference voltage generated by the reference source circuit, and outputting the digital signal.

[0067] Specifically, the reference source circuit generates the A / D conversion reference voltage, and the A / D conversion circuit performs analog-digital conversion on the conditioned analog voltage signal.

[0068] a CPU processing unit for demodulating the angle displacement information from the digital signal.

[0069] Specifically, the CPU processing circuit selects a DSP as the master control chip, and collects the digital signal after A / D conversion. In combination with the reference data obtained by software calibration, the DSP is used to analyze the collected data, demodulate the angle displacement information to be measured, and realize real-time monitoring of the position of the throttle lever in the airborne electronic system.

[0070] The signal conditioning unit is an important part of the airborne angle displacement sensor signal high-precision acquisition system, as shown in Figure 2 , mainly including an angle displacement signal conversion circuit, a configuration circuit, a filter circuit, a voltage conditioning circuit, a reference source circuit and an A / D conversion circuit. The filter circuit can be composed of a resistance-capacitance filter circuit, the voltage conditioning circuit can be composed of a proportional amplification circuit based on an operational amplifier, and the reference source circuit and the A / D conversion circuit can be built by using mature integrated chips respectively. In the signal conditioning circuit part, the design of the angle displacement signal conversion circuit is the most complex, so the analysis of the signal conditioning circuit is the key to the design of the airborne angle displacement sensor signal high-precision acquisition system.

[0071] As shown in Figure 3 , the angle displacement signal conversion circuit includes: an input positive power supply terminal 1, a negative excitation terminal 2, a positive excitation terminal 3, a feedback signal V A terminal 4, a feedback signal V B terminal 5, a feedback signal V MID terminal 6, a ground terminal 7, a single-chip linear displacement differential transformer signal conditioning chip 9, a short-circuit resistor R110, an input negative power supply terminal 11, an excitation signal voltage configuration resistor RR112, a full-scale output voltage configuration resistor RR213, a bias voltage configuration resistor RR314, an excitation signal frequency configuration capacitor C315 and a power supply voltage filter circuit. Among them, the power supply voltage filter circuit is a filter capacitor group 8, which includes a filter capacitor C1801 and a filter capacitor C2802.

[0072] The single-chip linear displacement differential transformer signal conditioning chip 9 comprises a first terminal 901, a second terminal 902, a third terminal 903, a fourth terminal 904, a fifth terminal 905, a sixth terminal 906, a seventh terminal 907, an eighth terminal 908, a ninth terminal 909, a tenth terminal 910, an eleventh terminal 911, a twelfth terminal 912, a thirteenth terminal 913, and a fourteenth terminal 914.

[0073] The first terminal 901 is connected with the first end of the input positive power supply terminal 1 and the filter capacitor C1801; the second terminal 902 is connected with the negative excitation terminal 2; the third terminal 903 is connected with the positive excitation terminal 3; the fourth terminal 904 is connected with the feedback signal V A terminal 4; the fifth terminal 905 is connected with the feedback signal V B terminal 5; the sixth terminal 906 is connected with the ground terminal 7; the seventh terminal 907 is connected with the first end of the input negative power supply terminal 11 and the filter capacitor C2802; the eighth terminal 908 is connected with the first end of the excitation signal voltage configuration resistor RR112; the ninth terminal 909 is connected with the second end of the excitation signal voltage configuration resistor RR112; the tenth terminal 910 is connected with the second end of the full-scale output voltage configuration resistor R313 and the first end of the voltage dividing resistor 16R2; the eleventh terminal 911 is connected with the first end of the full-scale output voltage configuration resistor RR213; the twelfth terminal 912 is connected with the first end of the bias voltage configuration resistor RR314; the thirteenth terminal 913 is connected with the first end of the excitation signal frequency configuration capacitor C315; the fourteenth terminal 914 is connected with the second end of the excitation signal frequency configuration capacitor C315; the feedback signal V MID terminal 6 is connected with the first end of the short-circuit resistor R110; the second ends of the filter capacitor C1801 and the filter capacitor C2802 are grounded; the second end of the short-circuit resistor R110 is grounded; the second end of the bias voltage configuration resistor RR314 is grounded; the second end of the voltage dividing resistor 16R2, the first end of the voltage dividing resistor 17R3, and the first end of the filter capacitor C418 are connected with the output terminal 19; the second end of the voltage dividing resistor 17R3 and the second end of the filter capacitor C418 are grounded.

[0074] The input positive power supply terminal 1 is used to access a +15V working power supply; the negative excitation terminal 2 and the positive excitation terminal 3 are used to provide a pair of differential sine excitations for a sensor; the feedback signal V A terminal 4, the feedback signal V B terminal 5, the feedback signal V MIDThe terminal 6 is used for receiving a three-wire sinusoidal signal of sensor feedback; the ground terminal 7 is used for accessing ground; the filter capacitor C1801 is used for filtering a +15V working power supply; the filter capacitor C2802 is used for filtering a -15V working power supply; the single-chip linear displacement differential transformer signal conditioning chip 9 is used for realizing functions of sensor excitation signal generation and sensor feedback signal conditioning into a single-ended direct current voltage signal; the short-circuit resistor R110 is used for short-circuiting the sensor feedback V MID The signal and the ground are short-circuited; the input negative power supply terminal 11 is used for accessing a -15V working power supply; the excitation signal voltage configuration resistor RR112 is used for adjusting an excitation signal voltage amplitude; the full-scale output voltage configuration resistor RR213 is used for adjusting a full-scale output voltage; the bias voltage configuration resistor RR314 is used for adjusting an output bias voltage; and the excitation signal frequency configuration capacitor C315 is used for adjusting an excitation signal frequency.

[0075] The filter circuit comprises a voltage dividing resistor R216 and a filter capacitor C418. The first end of the voltage dividing resistor R216 is connected with the output end of the angular displacement signal conversion circuit, and the second end of the voltage dividing resistor R216 and the first end of the filter capacitor C418 are both connected with the output end of the voltage conditioning circuit, and the second end of the filter capacitor C418 is grounded.

[0076] The voltage conditioning circuit comprises a voltage dividing resistor R216, a voltage dividing resistor R317 and an output terminal 19. The first end of the voltage dividing resistor R317 is connected with the output terminal 19, and the second end of the voltage dividing resistor R317 is grounded.

[0077] Specifically, the voltage dividing resistor R216 and the voltage dividing resistor R317 constitute a voltage dividing circuit to condition the single-ended direct current voltage output by the tenth terminal 910 into a range of an analog-to-digital converter. The voltage dividing resistor R216 and the filter capacitor C418 constitute a filter circuit to filter the output voltage signal. The output terminal 19 is used for outputting the conditioned direct current voltage.

[0078] The angular displacement signal conversion circuit mainly comprises an excitation signal generation circuit and an angular displacement signal conditioning circuit. A conventional circuit design adopts a differential rectifier circuit and a phase-sensitive detection circuit. Both of the two measurement methods are based on discrete electronic components to build, and the circuit is complex and not easy to debug. The single-chip linear displacement differential transformer signal conditioning chip makes up for the defects in this aspect, and the circuit has high integration and adjustable output gain.

[0079] The angular displacement signal conversion circuit based on the single-chip linear displacement differential transformer signal conditioning chip adopts ±15V dual power supply, and the filter capacitor C1801 and the filter capacitor C2802 are used for filtering the positive and negative power supplies. The voltage V EXC The excitation signal voltage configuration resistor RR112 can be configured by adjusting the resistance value, and according to V EXC-RR1 characteristic curve, the resistance value of the excitation signal voltage configuration resistor RR112 is between 10kΩ and 30kΩ. For easy and precise adjustment, an external 50kΩ potentiometer is used for the excitation signal voltage configuration resistor RR112 in the design. The frequency F of the excitation signal... EXC The frequency of the excitation signal is determined by the capacitor C315, and the relationship between the two is shown in formula (1):

[0080] C3 = 35 μF / F EXC (1)

[0081] Full-scale output voltage V OUT It is a function of the sensor sensitivity S (output slope), the maximum operating range d (output angle range), and the full-scale output voltage configuration resistor RR212, as shown in formula (2):

[0082] V OUT =S×d×500μA×RR2 (2)

[0083] Combining formula (2), based on the sensor parameters and the required voltage V OUT The full-scale output voltage configuration resistor RR212 can be calculated as shown in formula (3). To facilitate precise adjustment, an external 20kΩ potentiometer is used for the full-scale output voltage configuration resistor RR212 in the design.

[0084]

[0085] Output bias voltage V OS The bias voltage can be configured by adjusting the bias voltage configuration resistor RR314, where V is the bias voltage. OS The relationship between the bias voltage and the configuration resistor RR314 is shown in Equation (4).

[0086]

[0087] The bias voltage configuration resistor RR314 can be obtained by transforming formula (4), as shown in formula (5). To facilitate precise adjustment, an external 5kΩ potentiometer is used for the bias voltage configuration resistor RR314 in the design.

[0088]

[0089] Because the acquisition of a three-wire sinusoidal signal using a single-chip linear displacement differential transformer signal conditioning chip only requires V A -V B and V +EXC -V -EXC The ratio can be determined by using a 0Ω short-circuit resistor R110 to short-circuit the input common terminal V. MIDThe digital signal is received. The RC filter circuit composed of the voltage dividing resistor R216 and the filter capacitor C418 filters the single-ended DC voltage output by the single linear displacement differential transformer signal conditioning chip, and the voltage dividing circuit composed of the voltage dividing resistor R216 and the voltage dividing resistor R317 adjusts the filtered DC voltage to the acquisition range of the A / D converter.

[0090] According to the theoretical analysis, a high-precision acquisition system of the engine throttle lever position signal is designed, and an analog test platform for measuring the throttle lever position is built, as shown in Figure 4 .

[0091] The acquisition platform of the engine throttle lever position signal acquisition device includes a precision grating optical dividing head, a displacement sensor test bench, the angular displacement sensor, the engine throttle lever position signal acquisition device, and a digital meter.

[0092] The precision grating optical dividing head is connected to the displacement sensor test bench, the angular displacement sensor is coaxially connected to the locking shaft of the displacement sensor test bench, the tail connector of the angular displacement sensor is connected to the angular displacement signal conversion circuit of the engine throttle lever position signal acquisition device through a lead, and the digital meter is connected to the output end of the engine throttle lever position signal acquisition device.

[0093] Specifically, first, the precision grating optical dividing head and the displacement sensor test bench are connected. When the rotating test bench rocker arm is rotated, the grating optical dividing head displays the current angle. Then, the angular displacement sensor is fixed to the displacement sensor test bench, and the position of the sensor is adjusted so that it is coaxially connected to the locking shaft of the displacement test bench. After that, the tail connector of the angular displacement sensor is connected to the differential excitation signal and the three-wire sine signal of the position signal acquisition system through a lead. Finally, the digital meter is adjusted to the "volt" range, and the single-ended DC voltage output by the position signal acquisition system is monitored in real time.

[0094] To reduce the acquisition error of the throttle lever position measurement platform, zero-point calibration is required before testing. A function signal generator is used to provide a standard excitation signal for the angular displacement sensor, the displacement sensor test bench rocker arm is rotated, and the V A and V B signals of the angular displacement signal acquisition system are measured by a digital meter. When V A = V B , the rocker arm is fixed and the precision grating optical dividing head is zeroed and calibrated.

[0095] In some embodiments, as shown in Figure 5 , Figure 6 , Figure 7 , angle acquisition tests are respectively performed on three engine throttle lever position signal acquisition systems. Figure 5 , Figure 6, Figure 7 These correspond to boards 1, 2, and 3, respectively. The curves showing the relationship between the converted DC voltage of the acquisition system and the throttle rod angular displacement within the 0-120° throttle rod angular displacement range are shown. (a)-(c) represent the measurement results of acquisition systems 1-3, respectively.

[0096] Depend on Figure 5 , Figure 6 , Figure 7 It can be seen that when the throttle lever angular displacement changes within the range of 0-120°, the converted DC voltage increases linearly with the increase of the throttle lever angular displacement, and the converted DC voltage is within the range of 0-3V, which meets the range requirements of A / D acquisition.

[0097] Through the Figure 5 , Figure 6 , Figure 7 By performing linear fitting and calculation on the data, the relationship curves between the acquisition voltage error of acquisition systems 1-3 and the throttle lever angular displacement can be obtained, as shown below. Figure 8 , Figure 9 , Figure 10 As shown. Figure 8 , Figure 9 , Figure 10 These correspond to boards 1, 2, and 3 respectively. (From...) Figure 8 , Figure 9 , Figure 10 Calculations show that the full-scale errors of acquisition systems 1-3 are 0.50%, 0.51%, and 0.49%, respectively, indicating that the measurement errors of the three aircraft engine throttle position signal acquisition systems are all relatively small.

[0098] exist Figure 4 In the engine throttle lever position signal acquisition platform shown, the host computer and the No. 1 angular displacement signal acquisition system are connected to read the acquired data processed by the DSP. Within the 0-120° throttle lever angular displacement range, the relationship curve between the converted DC voltage of the acquisition system and the throttle lever angular displacement is shown below. Figure 11 As shown in (a), the curve relating the collected voltage error to the throttle lever angular displacement is as follows: Figure 11 As shown in (b).

[0099] Depend on Figure 11 Calculations show that after the DSP processor performs software calibration and error processing on the measurement results, the measurement error of the acquisition system is effectively reduced, with a full-scale error of only 0.22%. Therefore, the designed aero-engine throttle position signal acquisition system can achieve high-precision acquisition of the throttle position.

[0100] like Figure 12 As shown, to further investigate the consistency of accuracy of the aero-engine throttle lever position signal acquisition system, the results of acquisition systems 1-3 are compared. Figure 12It can be seen that the conversion DC voltage and the throttle lever angular displacement relationship curves of the No. 1, No. 2 and No. 3 collection systems are nearly overlapped, that is, the collection of the output signals of the same angular displacement sensor by the three collection systems obtains approximately consistent results. Therefore, the aviation engine throttle lever position signal high-precision collection method proposed in the present application has high consistency and feasibility.

[0101] By parameter calibration on the engine throttle lever position signal collection system, the calibration data are stored in the internal memory of the system. When the throttle lever is pushed to a certain angle, the current angle can be demodulated through the converted DC voltage of the collection system, so as to realize high-precision real-time collection of the throttle lever position. Moreover, by adjusting the external configuration and combining with software calibration, the collection method can be popularized to angular displacement sensors of various types.

[0102] The beneficial effects of the embodiment of the present application are as follows:

[0103] The embodiment of the present application provides a high-precision collection method of an aviation engine throttle lever position signal. By analyzing the working principle of an airborne angular displacement sensor, a collection device of the engine throttle lever position signal is designed, and an engine throttle lever position signal collection platform is built to perform angular displacement measurement analysis on the collection system. The results show that in the range of 0-120° angular displacement, the full-scale error is only 0.22%, which has the advantages of high precision, small error and good consistency, and can realize high-precision real-time measurement of the aviation engine throttle lever position information. In addition, according to different angular displacement sensor characteristic requirements, by adjusting the configuration of the collection device, the adjustment of the excitation signal amplitude, the full-scale output voltage and the output bias voltage and other parameters can be realized, so that the collection device is applicable to angular displacement sensors of various types, and has strong popularization.

[0104] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts of each of the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments. Especially, for the method embodiment described later, since it is corresponding to the system, the description is relatively simple, and the related parts can be referred to the part of the system embodiment.

[0105] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in 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. An engine throttle lever position signal acquisition device characterized by comprising: include: The signal conditioning unit and the CPU processing unit, wherein, The signal conditioning unit includes: Angular displacement signal conversion circuit, configuration circuit, filtering circuit, voltage conditioning circuit, A / D conversion circuit and reference source circuit; An angular displacement signal conversion circuit is used to provide a differential excitation sinusoidal signal to the angular displacement sensor and convert the three-wire sinusoidal voltage signal output by the angular displacement sensor into a single-ended DC voltage signal. The differential excitation sinusoidal signal is output to the angular displacement sensor, and the single-ended DC voltage signal is output to the filter circuit. The configuration circuit is used to configure the resistance value of the internal resistor of the configuration circuit, and to adjust the excitation signal voltage, full-scale output voltage and output bias voltage in the angular displacement signal conversion circuit respectively. The filtering circuit is used to filter the single-ended DC voltage signal output by the angular displacement signal conversion circuit and output the filtered voltage signal. The voltage conditioning circuit is used to condition the filtered voltage signal generated by the filtering circuit into a DC voltage signal that meets the AD range, and output the DC voltage signal that meets the AD range. The reference source circuit is used to provide a reference voltage for the A / D conversion circuit; The A / D conversion circuit is used to convert the DC voltage signal that meets the AD range into a digital signal using the reference voltage generated by the reference source circuit, and output the digital signal. The CPU processing unit is used to demodulate the digital signal to obtain angular displacement information.

2. An engine throttle lever position signal acquisition device according to claim 1, characterized in that, The angular displacement signal conversion circuit includes: Input positive power terminal (1), negative excitation terminal (2), positive excitation terminal (3), feedback signal V A Terminal (4), feedback signal V B Terminal (5), feedback signal V MID Terminal (6), ground terminal (7), monolithic linear displacement differential transformer signal conditioning chip (9), short-circuit resistance R1 (10), input negative power terminal (11), excitation signal voltage configuration resistance RR1 (12), full-scale output voltage configuration resistance RR2 (13), bias voltage configuration resistance RR3 (14), excitation signal frequency configuration capacitor C3 (15), filter capacitor C1 (801) and filter capacitor C2 (802); The monolithic linear displacement differential transformer signal conditioning chip (9) is used to realize the function of generating the excitation signal of the angular displacement sensor and conditioning the feedback signal of the angular displacement sensor into a single-ended DC voltage signal. The monolithic linear displacement differential transformer signal conditioning chip (9) includes: a first terminal (901), a second terminal (902), a third terminal (903), a fourth terminal (904), a fifth terminal (905), a sixth terminal (906), a seventh terminal (907), an eighth terminal (908), a ninth terminal (909), a tenth terminal (910), an eleventh terminal (911), a twelfth terminal (912), a thirteenth terminal (913), and a fourteenth terminal (914). The first terminal (901) is connected with the input positive power terminal (1) and the first terminal of the filter capacitor C1 (801); the second terminal (902) is connected with the negative excitation terminal (2); the third terminal (903) is connected with the positive excitation terminal (3); the fourth terminal (904) is connected with the feedback signal V A The fifth terminal (905) is connected with the feedback signal V B The sixth terminal (906) is connected with the ground terminal (7); the seventh terminal (907) is connected with the input negative power terminal (11) and the first terminal of the filter capacitor C2 (802); the eighth terminal (908) is connected with the first terminal of the excitation signal voltage configuration resistor RR1 (12); the ninth terminal (909) is connected with the second terminal of the excitation signal voltage configuration resistor RR1 (12); the tenth terminal (910) is connected with the second terminal of the full-scale output voltage configuration resistor RR2 (13) and the first terminal of the voltage dividing resistor R2 (16); the eleventh terminal (911) is connected with the first terminal of the full-scale output voltage configuration resistor RR2 (13); the twelfth terminal (912) is connected with the first terminal of the bias voltage configuration resistor RR3 (14); the thirteenth terminal (913) is connected with the first terminal of the excitation signal frequency configuration capacitor C3 (15); the fourteenth terminal (914) is connected with the second terminal of the excitation signal frequency configuration capacitor C3 (15); the feedback signal V MID The sixth terminal (906) is connected with the ground terminal (7); the seventh terminal (907) is connected with the input negative power terminal (11) and the first terminal of the filter capacitor C2 (802); the eighth terminal (908) is connected with the first terminal of the excitation signal voltage configuration resistor RR1 (12); the ninth terminal (909) is connected with the second terminal of the excitation signal voltage configuration resistor RR1 (12); the tenth terminal (910) is connected with the second terminal of the full-scale output voltage configuration resistor RR2 (13) and the first terminal of the voltage dividing resistor R2 (16); the eleventh terminal (911) is connected with the first terminal of the full-scale output voltage configuration resistor RR2 (13); the twelfth terminal (912) is connected with the first terminal of the bias voltage configuration resistor RR3 (14); the thirteenth terminal (913) is connected with the first terminal of the excitation signal frequency configuration capacitor C3 (15); the fourteenth terminal (914) is connected with the second terminal of the excitation signal frequency configuration capacitor C3 (15); the feedback signal V MID The sixth terminal (906) is connected with the ground terminal (7); the seventh terminal (907) is connected with the input negative power terminal (11) and the first terminal of the filter capacitor C2 (802); the eighth terminal (908) is connected with the first terminal of the excitation signal voltage configuration resistor RR1 (12); the ninth terminal (909) is connected with the second terminal of the excitation signal voltage configuration resistor RR1 (12); the tenth terminal (910) is connected with the second terminal of the full-scale output voltage configuration resistor RR2 (13) and the first terminal of the voltage dividing resistor R2 (16); the eleventh terminal (911) is connected with the first terminal of the full-scale output voltage configuration resistor RR2 (13); the twelfth terminal (912) is connected with the first terminal of the bias voltage configuration resistor RR3 (14); the thirteenth terminal (913) is connected with the first terminal of the excitation signal frequency configuration capacitor C3 (15); the fourteenth terminal (914) is connected with the second terminal of the excitation signal frequency configuration capacitor C3 (15); the feedback signal V The first end of the filter capacitor C1 (801) is connected to the first terminal (901), the first end of the filter capacitor C2 (802) is connected to the seventh terminal (907), and the second ends of both the filter capacitor C1 (801) and the filter capacitor C2 (802) are grounded. The filter capacitor C1 (801) is used to filter the +15V working power supply, and the filter capacitor C2 (802) is used to filter the -15V working power supply.

3. An engine throttle lever position signal acquisition device according to claim 2, characterized in that, The feedback signal V A Terminal (4) is connected to the V A feedback signal V B Terminal (5) is connected to the V B feedback signal V A Terminal (4), feedback signal V B Terminal (5) and feedback signal V MID Terminal (6) is used to receive the three-wire sine signal feedback by the angular displacement sensor.

4. The engine throttle lever position signal acquisition device according to claim 2, characterized by The excitation signal voltage configuration resistor RR1(12) is used to adjust the amplitude of the excitation signal voltage, and the resistance of the excitation signal voltage configuration resistor RR1(12) is 10kΩ to 30kΩ.

5. The engine throttle lever position signal acquisition device according to claim 2, characterized by, The excitation signal frequency configuration capacitor C3(15) is used to adjust the frequency of the excitation signal, the excitation signal frequency configuration capacitor C3(15) is calculated by the formula C3=35μF / F EXC where F EXC is the frequency of the excitation signal.

6. The engine throttle lever position signal acquisition device according to claim 2, characterized by The full-scale output voltage configuration resistor RR2 (13) is used to adjust the full-scale output voltage, and the full-scale output voltage configuration resistor RR2 (13) is configured by the formula is calculated, wherein V OUT is the full-scale output voltage, S is the sensitivity of the angular displacement sensor, and d is the maximum working range.

7. The engine throttle lever position signal acquisition device according to claim 2, characterized by, The bias voltage is configured by the formula where V OS is the bias voltage.

8. The engine throttle lever position signal acquisition device according to claim 1, characterized by, The filtering circuit is used to filter the single-ended DC voltage signal, including: A voltage dividing resistor R2 (16) and a filter capacitor C4 (18); A first end of the voltage dividing resistor R2 (16) is connected to an output end of the angular displacement signal conversion circuit, a second end of the voltage dividing resistor R2 (16) and a first end of the filter capacitor C4 (18) are both connected to an output end of the voltage conditioning circuit, and a second end of the filter capacitor C4 (18) is grounded.

9. An engine throttle lever position signal acquisition device according to claim 8, characterized in that, The voltage conditioning circuit conditions the single-ended DC voltage to be within a range of an analog-to-digital converter at a back end, including: A voltage dividing resistor R2 (16), a voltage dividing resistor R3 (17), and an output end of the voltage conditioning circuit; A first end of the voltage dividing resistor R3 (17) is connected to the output end of the voltage conditioning circuit, and a second end of the voltage dividing resistor R3 (17) is grounded. The output end of the voltage conditioning circuit includes an output terminal (19) for outputting the conditioned DC voltage.

10. An acquisition platform based on the engine throttle lever position signal acquisition device according to any one of claims 1 to 9, characterized in that, Including: A precision grating optical dividing head, a displacement sensor test bench, the angular displacement sensor, the engine throttle lever position signal acquisition device, and a digital table; The precision grating optical dividing head is connected to the displacement sensor test bench, the angular displacement sensor is coaxially connected to a locking shaft of the displacement sensor test bench, a tail connector of the angular displacement sensor is connected to the angular displacement signal conversion circuit of the engine throttle lever position signal acquisition device through a lead wire, and the digital table is connected to an output end of the engine throttle lever position signal acquisition device.

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