CN117686114A - High-voltage aviation electric fuel pump driver temperature monitoring device and fuel pump - Google Patents
High-voltage aviation electric fuel pump driver temperature monitoring device and fuel pump Download PDFInfo
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Abstract
The invention belongs to the technical field of temperature monitoring of aircraft engine fuel pump drivers and discloses a high-voltage aircraft electric fuel pump driver temperature monitoring device. Comprising the following steps: the temperature sensor comprises an NTC temperature sensor module, a resistance frequency conversion module, a digital signal isolation module, a single-end-to-differential conversion module, a differential signal conditioning module, a differential-to-single-end conversion module, a frequency signal measurement module and a temperature measurement module.
Description
Technical Field
The invention belongs to the technical field of temperature monitoring of aircraft engine fuel pump drivers and discloses a high-voltage aircraft electric fuel pump driver temperature monitoring device.
Background
In recent years, the technology of multi-electric/hybrid aero-engine is internationally under the hot trend of research, and people have conducted researches on key components of the multi-electric/hybrid aero-engine to different degrees. An aircraft engine fuel pump control system using an electric fuel pump as a core architecture is one of key components of multi-electric/hybrid engine development, and is also regarded as a great innovation of the aircraft engine fuel control system in the industry.
The motor driver is one of the key core components of the electric fuel pump and works in a severe wide-temperature-range environment. The power electronic device in the motor driver is a device with larger heating value and temperature sensitivity, and in order to improve the reliability of a driving system, the power unit of the driver is required to be subjected to temperature monitoring, and the temperature monitoring is used as the basis for current limiting and working reliability evaluation of the power electronic device.
In the existing high-voltage aviation electric fuel pump driver, the power unit temperature monitoring device is as follows: the constant current source generates constant small current at the power unit, the resistance signal is converted into a voltage signal through the thermistor, the voltage signal is converted into an analog voltage signal through the linear optocoupler or the analog isolation device, the microprocessor controls the A/D converter to convert the analog voltage into a digital signal, and the digital quantity is further converted into real-time temperature. In the temperature monitoring device, the transmission ratio of the linear optocoupler or the analog isolation device is greatly influenced by temperature, and the high-voltage aviation electric fuel pump driver just works in a wide temperature range, so that the temperature monitoring precision is reduced; on the other hand, when the high-voltage aviation electric fuel pump driver works, the high-frequency switch generates stronger common-mode disturbance, and is coupled into an analog signal through common-ground impedance, so that the signal-to-noise ratio of the analog voltage is reduced, and the reliability of temperature monitoring is further reduced.
Disclosure of Invention
The purpose of the invention is that: aiming at the defects and shortcomings in the background technology, the invention aims to provide a high-voltage aviation electric fuel pump driver temperature monitoring device which can meet the high-precision temperature monitoring requirement of a high-voltage aviation electric fuel pump on a driver power unit in severe working conditions with a wide temperature range and strong common mode disturbance.
The technical scheme of the invention is as follows:
a high voltage avionics fuel pump driver temperature monitoring device comprising: the temperature sensor comprises an NTC temperature sensor module, a resistance frequency conversion module, a digital signal isolation module, a single-end-to-differential conversion module, a differential signal conditioning module, a differential-to-single-end conversion module, a frequency signal measurement module and a temperature measurement module;
the NTC temperature sensor module is used for converting a physical temperature signal of a power unit in the driver into a corresponding resistance signal;
the resistor frequency conversion module is used for receiving the resistor signal output by the NTC temperature sensor module, converting the resistor signal into a digital frequency signal and outputting the digital frequency signal to the digital signal isolation module;
the digital signal isolation module is used for carrying out digital isolation on the digital frequency signals, and the digital frequency signals after digital isolation are output to the single-ended-to-differential conversion module;
the single-end-to-differential conversion module is used for converting the digital frequency signal into a differential signal;
the differential signal conditioning module is used for receiving the differential signal output by the single-end-to-differential conversion module, generating a differential frequency signal after differential mode filtering, and outputting the differential frequency signal to the differential-to-single-end conversion module;
the differential-to-single-ended conversion module is used for converting the differential frequency signal into a single-ended frequency signal and outputting the single-ended frequency signal to the frequency signal measurement module;
the frequency signal measuring module is used for receiving the single-ended frequency signal output by the differential-to-single-ended conversion module, carrying out frequency measurement, converting the single-ended frequency signal into a digital frequency signal and outputting the digital frequency signal to the temperature measuring module;
the temperature measurement module is used for receiving the digital frequency signal output by the frequency signal measurement module and mapping the frequency into real-time temperature.
Further, the temperature measurement range of the NTC temperature sensor module is 0-175 ℃, and the output resistance range is 13491-99 omega.
Further, the resistor frequency conversion module includes: the device comprises an RC charge-discharge module, a direct current bias module and a frequency signal shaping module;
the RC charge-discharge module and the resistance signal output by the NTC temperature sensor module form an RC circuit together, and periodic charge-discharge pulse waves are generated through the RC circuit; the RC charge-discharge module consists of a current-limiting resistor and a capacitor; one end of the current limiting resistor is connected with the positive output end of the NTC temperature sensor module, and the other end of the current limiting resistor is connected with the input end of the frequency signal shaping module; one end of the capacitor is connected with the negative output end of the NTC temperature sensor module, and the other end of the capacitor is grounded;
the direct current bias module is used for providing direct current bias voltage for the frequency signal shaping module;
the frequency signal shaping module consists of a comparator and a filter circuit, wherein one end of the comparator is connected with one end of the current limiting resistor far away from the NTC temperature sensor module, the other end of the comparator is connected with the output end of the DC offset module, and the comparator generates square waves according to periodic charge and discharge pulse waves and DC offset voltage; the filter circuit is connected with the in-phase end and the output end of the comparator and is used for filtering the non-working narrow pulse interference in the output square wave.
Further, the digital signal isolation module comprises an isolation power supply and a digital electromagnetic isolator;
the input end of the isolation power supply is connected with the high-voltage end of the driver, and the output end of the isolation power supply is connected with the low-voltage end of the digital electromagnetic isolator;
the signal input end of the digital electromagnetic isolator is connected with the digital frequency signal output by the resistance frequency conversion module, the output end of the digital electromagnetic isolator is connected to the single-ended to differential conversion module, and the output signal and the input signal are in the same frequency and phase.
Further, the differential signal output by the single-end to differential conversion module is composed of a differential positive end and a differential negative end, the differential positive end is in phase with the input single-end signal, and the differential negative end is in phase with the input single-end signal.
Further, the differential signal conditioning module comprises a filtering module and an impedance matching module;
the filtering module is a pi-type filter and is used for reducing differential mode interference in a differential signal transmission path; the pi-type filter comprises an inductor and two capacitors, wherein one capacitor is parasitic capacitance of the differential signal output circuit, the cut-off frequency of the filter is 35KHz, the passband gain is 0dB, and the stopband attenuation is-40 dB;
the impedance matching module is used for matching the impedance of the filtering module with the differential-to-single-ended conversion module.
Further, the frequency signal measurement module configures an external interrupt to be a rising edge trigger and a falling edge trigger through a microprocessor;
recording the count value of a rising edge timer of the frequency signal obtained by external interruption for the first time as count1, the count value of a falling edge timer of the frequency signal obtained by external interruption for the first time as count2, and the count value of a rising edge timer of the frequency signal obtained by external interruption for the second time as count3;
the step length of the timer is recorded as step;
period t=step (count 3-count 1) of the frequency signal; the frequency f=1/T of the frequency signal; the duty cycle is d= (count 2-count 1)/(count 3-count 1);
if the frequency signal is 4.6KHz < f <30.1KHz and 0.1< D <0.9, the weighting factor of the measurement frequency signal is set to be 1, otherwise, the weighting factor is set to be 0.
Further, the temperature measurement module comprises frequency temperature conversion and Kalman filtering;
the frequency-temperature conversion determines the final frequency of the signal according to the frequency and the weighting factor of the frequency signal, and generates a temperature signal according to the final frequency of the signal in a table look-up mode.
The kalman filter is used to filter the temperature signal, Q in the filter is set to 0.99, and r is set to 0.04.
An aircraft engine fuel pump provided with said temperature monitoring device.
The invention has the beneficial effects that:
1) The temperature monitoring device of the high-voltage aviation electric fuel pump driver is provided;
2) The problem of measurement deviation caused by temperature drift when the analog signal works in a wide temperature range is avoided;
3) The temperature monitoring device has better disturbance inhibition and electromagnetic compatibility performance through common mode and differential mode inhibition;
4) High-frequency noise in temperature measurement is restrained by a frequency signal processing and Kalman filtering method, and the reliability of temperature measurement is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, specific drawings of the embodiments will be described.
Fig. 1 is a schematic diagram of a high voltage avionics fuel pump driver temperature monitoring device.
Fig. 2 is a schematic diagram of a resistor frequency conversion module.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.
Furthermore, the terms "mounted," "configured," "provided," "connected," "coupled," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
A high voltage avionics fuel pump driver temperature monitoring device, as shown in fig. 1, comprising: the temperature sensor comprises an NTC temperature sensor module, a resistance frequency conversion module, a digital signal isolation module, a single-end-to-differential conversion module, a differential signal conditioning module, a differential-to-single-end conversion module, a frequency signal measurement module and a temperature measurement module;
the NTC temperature sensor module is used for converting a physical temperature signal of a power unit in the driver into a corresponding resistance signal;
the resistor frequency conversion module is used for receiving the resistor signal output by the NTC temperature sensor module, converting the resistor signal into a digital frequency signal and outputting the digital frequency signal to the digital signal isolation module;
the digital signal isolation module is used for receiving the digital frequency signal output by the resistor frequency conversion module, carrying out digital isolation on the digital frequency signal, and preventing the driver from being damaged due to the fact that the high-voltage spike pulse of the high-voltage end of the driver is coupled to the low-voltage control end of the driver;
the single-end-to-differential conversion module is used for converting the frequency signal after digital isolation into a differential signal, strong radiation interference is generated when the high-voltage motor driver works, a common-mode loop is formed through a distributed capacitor, and common-mode interference suppression is needed, so that the sensitivity of the digital frequency signal to the common-mode interference is reduced by utilizing the excellent common-mode interference suppression performance of the differential signal, and the conditioned differential frequency signal is output to the differential signal conditioning module;
the differential signal conditioning module is used for receiving the differential signal output by the single-end-to-differential conversion module, and the front-stage signal possibly generates narrow interference pulses and needs to be restrained by a filter, so that the differential signal conditioning module is designed, the high-frequency differential mode interference component in the differential frequency signal is reduced, the reliability of the differential frequency signal is improved, and the differential frequency signal is output to the differential-to-single-end conversion module;
the differential-to-single-ended conversion module is used for receiving the differential frequency signal output by the differential signal conditioning module, converting the differential frequency signal into a single-ended signal and outputting the single-ended signal to the frequency signal measurement module; because the microprocessor only receives the single-ended digital signal input, the differential signal is converted into a single-ended signal;
the frequency signal measuring module is used for receiving the frequency signal output by the differential-to-single-ended conversion module, carrying out frequency measurement, converting the frequency signal into digital quantity and outputting the digital quantity to the temperature measuring module;
and the temperature measurement module is used for receiving the frequency digital quantity output by the frequency signal measurement module, mapping the frequency into real-time temperature, storing a mapping table of the frequency and the temperature in the microprocessor, and performing table lookup operation.
The NTC temperature sensor module has a temperature measurement range of 0-175 ℃ and an output resistance range of 13491-99 omega.
The resistor frequency conversion module comprises an RC charge-discharge module, a direct current bias module and a frequency signal shaping module, and is shown in figure 2.
The RC charge-discharge module is used for combining a resistor, a capacitor and a current-limiting resistor which are output by the NTC temperature sensor module to form an RC circuit, and periodic charge-discharge pulse waves are generated through capacitor charge-discharge control.
The current limiting resistor is used for preventing the RC charge-discharge module from failing when the NTC is short-circuited.
And the minimum charge-discharge period of the RC charge-discharge module is 33.22ms, and the maximum charge-discharge period of the RC charge-discharge module is 271.39ms.
The direct current bias module is used for providing direct current bias voltage for the frequency signal shaping module and is generated by resistor voltage division.
The frequency signal shaping module is used for shaping periodic charge and discharge pulse waves output by the RC charge and discharge module into square wave signals, and consists of a comparator and a filter circuit, wherein the in-phase end of the comparator is connected with the direct current bias voltage output by the direct current bias module, the opposite phase end of the comparator is connected with the negative end of the NTC resistor, and the filter circuit is of a resistor and capacitor parallel structure connected with the in-phase end and the output end of the comparator and is used for inhibiting peak narrow pulses in the frequency signals.
The digital signal isolation module comprises an isolation power supply and a digital electromagnetic isolator, wherein the isolation power supply is a DC 5V-DC 5V isolation power supply module, the isolation voltage is DC3000V, the power input end is in power supply connection with the high-voltage end of the digital electromagnetic isolator, and the power output end is in power supply connection with the low-voltage end of the digital electromagnetic isolator. The digital electromagnetic isolator is an adum1410D type electromagnetic isolation chip.
The adum1410D outputs a square wave signal, the square wave signal is converted into a differential signal after passing through an SN75176 type single-end-to-differential chip, the differential positive signal is in the same frequency and the same phase as the square wave signal output by the adum1410D, and the differential negative signal is in the same frequency and the opposite phase as the square wave signal output by the adum 1410D.
The capacitance of the SN75176 differential signal output pin to the ground is 15pF, a pi-type filter is constructed through inductance and capacitance, the cut-off frequency of the filter is 35KHz through inductance and capacitance parameter adjustment, the passband gain is 0dB, and the stopband attenuation is-40 dB.
Impedance mismatch in the circuit causes signal transmission quality to be reduced, an impedance matcher is inserted between the pi-type filter and the differential-to-single-ended device, non-distortion transmission of differential signals is ensured, the impedance matcher is realized by an operational amplifier LM324, a non-inverting input end of the impedance matcher is connected with the differential signals, and an inverting input end of the impedance matcher is connected with an output end of the impedance matcher.
The two paths of differential signals output by the LM324 are conditioned into single-ended signals after passing through an SN65C1167 differential-to-single-ended converter, and then enter a microprocessor.
The microprocessor runs frequency signal measuring software and combines external interrupt and a timer to realize the measurement of frequency signals;
the frequency measurement method comprises the following steps: the step length of the timer is 1us, the first time that the external interrupt acquires the count value of the rising edge timer of the frequency signal is count1, the first time that the count value of the falling edge timer of the frequency signal is count2, the second time that the count value of the rising edge timer of the frequency signal is count3, the period T=1us (count 3-count 1) of the frequency signal, the frequency f=1/T, and the signal duty ratio is D= (count 2-count 1)/(count 3-count 1) are recorded;
the frequency range corresponding to the effective temperature is 4.6KHz < f <30.1KHz, the duty ratio of the normal frequency signal is between 0.1 and 0.9, in order to promote the effectiveness of frequency measurement, a weighting factor is set to indicate the effectiveness of the frequency signal, when the frequency range is 4.6KHz < f <30.1KHz and 0.1< D <0.9, the frequency measurement is effective, the weighting factor is set to 1, otherwise, the weighting factor is set to 0.
The microprocessor is preset with a lookup mapping table between frequency and temperature, the frequency f is input, and the corresponding temperature can be obtained through lookup.
To further suppress the influence of measurement noise on the temperature measurement, the temperature signal was filtered using a kalman filter, with Q set to 0.99 and r set to 0.04.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (9)
1. A high voltage aviation electric fuel pump driver temperature monitoring device, characterized in that the control device comprises: the temperature sensor comprises an NTC temperature sensor module, a resistance frequency conversion module, a digital signal isolation module, a single-end-to-differential conversion module, a differential signal conditioning module, a differential-to-single-end conversion module, a frequency signal measurement module and a temperature measurement module;
the NTC temperature sensor module is used for converting a physical temperature signal of a power unit in the driver into a corresponding resistance signal;
the resistor frequency conversion module is used for receiving the resistor signal output by the NTC temperature sensor module, converting the resistor signal into a digital frequency signal and outputting the digital frequency signal to the digital signal isolation module;
the digital signal isolation module is used for carrying out digital isolation on the digital frequency signals, and the digital frequency signals after digital isolation are output to the single-ended-to-differential conversion module;
the single-end-to-differential conversion module is used for converting the digital frequency signal into a differential signal;
the differential signal conditioning module is used for receiving the differential signal output by the single-end-to-differential conversion module, generating a differential frequency signal after differential mode filtering, and outputting the differential frequency signal to the differential-to-single-end conversion module;
the differential-to-single-ended conversion module is used for converting the differential frequency signal into a single-ended frequency signal and outputting the single-ended frequency signal to the frequency signal measurement module;
the frequency signal measuring module is used for receiving the single-ended frequency signal output by the differential-to-single-ended conversion module, carrying out frequency measurement, converting the single-ended frequency signal into a digital frequency signal and outputting the digital frequency signal to the temperature measuring module;
the temperature measurement module is used for receiving the digital frequency signal output by the frequency signal measurement module and mapping the frequency into real-time temperature.
2. The temperature monitoring device according to claim 1, wherein the temperature measurement range of the NTC temperature sensor module is 0-175 ℃ and the output resistance range is 13491 Ω -99 Ω.
3. The temperature monitoring device of claim 2, wherein the resistance frequency conversion module comprises: the device comprises an RC charge-discharge module, a direct current bias module and a frequency signal shaping module;
the RC charge-discharge module, the resistance signal output by the NTC temperature sensor module and the current limiting resistor form an RC circuit together, and periodic charge-discharge pulse waves are generated through the RC circuit; the RC charge-discharge module consists of a current-limiting resistor and a capacitor; one end of the current limiting resistor is connected with the positive output end of the NTC temperature sensor module, and the other end of the current limiting resistor is connected with the positive power supply of the power supply; one end of the capacitor is connected with the negative output end of the NTC temperature sensor module, and the other end of the capacitor is grounded;
the direct current bias module is used for providing direct current bias voltage for the frequency signal shaping module;
the frequency signal shaping module consists of a comparator and a filter circuit, wherein one end of the comparator is connected with the negative end of the NTC temperature sensor, the other end of the comparator is connected with the output end of the DC bias module, and the comparator generates square waves according to periodic charge and discharge pulse waves and DC bias voltage; the filter circuit is connected with the in-phase end and the output end of the comparator and is used for filtering the non-working narrow pulse interference in the output square wave.
4. A temperature monitoring device according to claim 3, wherein the digital signal isolation module comprises an isolated power supply and a digital electromagnetic isolator;
the input end of the isolation power supply is connected with the high-voltage end of the driver, and the output end of the isolation power supply is connected with the low-voltage end of the digital electromagnetic isolator;
the signal input end of the digital electromagnetic isolator is connected with the digital frequency signal output by the resistance frequency conversion module, the output end of the digital electromagnetic isolator is connected to the single-ended to differential conversion module, and the output signal and the input signal are in the same frequency and phase.
5. The temperature monitoring device of claim 4, wherein the differential signal output by the single-ended to differential conversion module is comprised of a differential positive terminal and a differential negative terminal, the differential positive terminal being in phase with the input single-ended signal, the differential negative terminal being in anti-phase with the input single-ended signal.
6. The temperature monitoring device of claim 5, wherein the differential signal conditioning module comprises a filtering module and an impedance matching module;
the filtering module is a pi-type filter and is used for reducing differential mode interference in a differential signal transmission path; the pi-type filter comprises an inductor and two capacitors, wherein one capacitor is parasitic capacitance of the differential signal output circuit, the cut-off frequency of the filter is 35KHz, the passband gain is 0dB, and the stopband attenuation is-40 dB;
the impedance matching module is used for matching the impedance of the filtering module with the differential-to-single-ended conversion module.
7. The temperature monitoring device of claim 6, wherein the frequency signal measurement module configures the external interrupt to be a rising edge trigger and a falling edge trigger via a microprocessor;
recording the count value of a rising edge timer of the frequency signal obtained by external interruption for the first time as count1, the count value of a falling edge timer of the frequency signal obtained by external interruption for the first time as count2, and the count value of a rising edge timer of the frequency signal obtained by external interruption for the second time as count3;
the step length of the timer is recorded as step;
period t=step (count 3-count 1) of the frequency signal; the frequency f=1/T of the frequency signal; the duty cycle is d= (count 2-count 1)/(count 3-count 1);
if the frequency signal is 4.6KHz < f <30.1KHz and 0.1< D <0.9, the weighting factor of the measurement frequency signal is set to be 1, otherwise, the weighting factor is set to be 0.
8. The temperature monitoring device of claim 7, wherein the temperature measurement module comprises frequency temperature conversion and kalman filtering;
the frequency-temperature conversion determines the final frequency of the signal according to the frequency and the weighting factor of the frequency signal, and generates a temperature signal according to the final frequency of the signal in a table look-up mode.
The kalman filter is used to filter the temperature signal, Q in the filter is set to 0.99, and r is set to 0.04.
9. An aircraft engine fuel pump, characterized by: the fuel pump is configured with the temperature monitoring device of any one of claims 1-8.
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| CN202311579447.4A CN117686114A (en) | 2023-11-23 | 2023-11-23 | High-voltage aviation electric fuel pump driver temperature monitoring device and fuel pump |
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| CN202311579447.4A CN117686114A (en) | 2023-11-23 | 2023-11-23 | High-voltage aviation electric fuel pump driver temperature monitoring device and fuel pump |
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