CN-119555179-B - Fuel oil measurement system and method based on double-channel time-sharing sampling control

CN119555179BCN 119555179 BCN119555179 BCN 119555179BCN-119555179-B

Abstract

The invention relates to the technical field of aviation fuel measurement, in particular to a fuel measurement system and method based on double-channel time-sharing sampling control; the oil quantity sensor signal acquisition system comprises an A acquisition board card and a B acquisition board card which are identical in structure, wherein the single acquisition board card comprises a double-channel time-sharing sampling control circuit, a CPU processing module, an oil quantity sensor acquisition channel change-over switch and an oil quantity sensor signal acquisition module, the double-channel time-sharing sampling control module is matched with control signals of the CPU processing module to carry out cross time-sharing acquisition on two groups of external oil quantity sensors, the CPU processing module outputs signals to control the double-channel time-sharing sampling control circuit, the oil quantity sensor acquisition channel change-over switch and the oil quantity sensor signal acquisition module to work, process and calculate data of the oil quantity sensors and convert the data into fuel quality, the oil quantity sensor acquisition channel change-over switch sequentially accesses multiple paths of external oil quantity sensors into the oil quantity sensor signal acquisition module, and the oil quantity sensor signal acquisition module converts capacitance signals of the oil quantity sensors into voltage signals and sends the voltage signals to the CPU processing module to carry out data calculation.

Inventors

XU WEI
LIU ZHAOQIANG
WANG MEILING
ZHANG ZHIMING
LI SHUNJIE

Assignees

四川泛华航空仪表电器有限公司

Dates

Publication Date: 20260508
Application Date: 20241031

Claims (7)

1. The fuel oil measuring system based on the double-channel time-sharing sampling control is characterized by comprising an A acquisition board and a B acquisition board, wherein the A acquisition board and the B acquisition board respectively comprise a double-channel time-sharing sampling control module, a CPU processing module, an oil quantity sensor acquisition channel change-over switch and an oil quantity sensor signal acquisition module; The acquisition board A is connected with the acquisition channel change-over switch of the oil quantity sensor; The oil quantity sensor acquisition channel change-over switch is connected with the double-channel time-sharing sampling control module and the CPU processing module; the input end of the dual-channel time-sharing sampling control module is connected with an external sensor and a power supply, and the output end of the dual-channel time-sharing sampling control module is connected with the other group of acquisition board cards of the CPU processing module; The oil quantity sensor signal acquisition module is connected with the oil quantity sensor acquisition channel change-over switch and the CPU processing module; The double-channel time-sharing sampling control module is used for acquiring capacitance signals of the external oil quantity sensor in a crossed time-sharing mode according to the control signals acquired from the CPU module; the oil quantity sensor acquisition channel change-over switch is used for sequentially connecting the external multipath oil quantity sensors into the oil quantity sensor signal acquisition module; The oil quantity sensor signal acquisition module is used for converting a capacitance signal acquired from the oil quantity sensor acquisition channel change-over switch into a voltage signal; The CPU module is used for calculating the fuel oil quantity according to the voltage signal; The two-channel time-sharing sampling control module comprises a sensor acquisition channel switching switch work enabling control circuit and a two-channel time-sharing sampling control circuit; The double-channel time-sharing sampling control circuit comprises an optocoupler unit and an MOS tube unit; The first input end of the optical coupling unit is connected with a power supply, the second input end of the optical coupling unit is connected with a ground end through the MOS tube unit, the first output end of the optical coupling unit is connected with another group of acquisition board cards, and the second output end of the optical coupling unit is connected with the ground end.
2. The fuel measurement system based on the dual-channel time-sharing sampling control of claim 1, wherein the MOS tube unit comprises a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube; The drain electrode of the first MOS tube is connected with the second input end of the optocoupler unit and the working enabling signal of the oil quantity sensor acquisition channel change-over switch, the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the grid electrode of the first MOS tube inputs a reset signal; The grid electrode of the second MOS tube is connected with the CPU module, and the source electrode of the second MOS tube is connected with the ground terminal; The drain electrode of the third MOS tube is connected with the first input end of the optocoupler unit and the working enabling signal of the oil quantity sensor acquisition channel change-over switch, the source electrode of the third MOS tube is connected with the drain electrode of the fourth MOS tube, and the grid electrode of the third MOS tube inputs a reset signal; And the grid electrode of the fourth MOS tube is connected with the CPU module through a limiting resistor, and the source electrode of the fourth MOS tube is connected with the ground terminal.
3. The fuel measuring system based on the dual-channel time-sharing sampling control according to claim 1, wherein the fuel sensor signal acquisition module comprises an excitation source circuit, a filter amplification circuit, a voltage follower circuit and an AD conversion circuit; One end of the excitation source circuit is connected with an external oil quantity sensor through a sensor acquisition channel change-over switch, and the other end of the excitation source circuit is connected with the filtering amplifying circuit; one end of the voltage follower circuit is connected with the filtering amplifying circuit, and the other end of the voltage follower circuit is connected with the AD conversion circuit; the excitation source circuit is used for generating a sine voltage signal; the filtering amplifying circuit is used for converting the sinusoidal voltage signal into a direct-current voltage signal; the AD conversion circuit is used for converting a direct-current voltage signal into a digital voltage signal.
4. The fuel measurement method based on the two-channel time-sharing sampling control is realized based on the fuel measurement system based on the two-channel time-sharing sampling control as claimed in claim 1, and is characterized by comprising the following steps: Acquiring capacitance signals from an external group A oil quantity sensor and an external group B oil quantity sensor in a time-sharing and cross manner according to control signals; According to the upper limit and the lower limit of the sampling values, the capacitance signals are converted into voltage signals, and the sampling values of the oil mass sensor signals are calculated; and calculating to obtain the fuel oil quantity according to the signal sampling value of the oil quantity sensor and the set stable limiting value.
5. The fuel measurement method based on the dual-channel time-sharing sampling control of claim 4, wherein when the A acquisition board is used for acquiring the external A-group fuel quantity sensor, the sensor acquisition channel switching state corresponding to the A-group fuel quantity sensor is set to be "on", the sensor acquisition channel switching state corresponding to the B-group fuel quantity sensor is set to be "off", the state of the sensor acquisition channel switching corresponding to the B-group fuel quantity sensor is set to be "off" by the optocoupler output stage of the A acquisition board, the B acquisition board is used for acquiring the B-group fuel quantity sensor in the time period, and after the A acquisition board is used for acquiring the A-group fuel quantity sensor, the sensor acquisition channel switching state of the B-group fuel quantity sensor is set to be "on", if the B acquisition board is not used for acquiring the B-group fuel quantity sensor in the time period, and if the B acquisition board is used for acquiring the B-group fuel quantity sensor, the sensor acquisition channel switching state corresponding to the A acquisition board is set to be "off".
6. The method for measuring fuel based on the dual-channel time-sharing sampling control according to claim 4, wherein the method for converting the capacitance signal into the voltage signal and calculating the sampling value of the fuel sensor signal according to the upper limit and the lower limit of the sampling value comprises the following steps: Setting the lower limit of the sampling value as according to the successive approximation algorithm of multiple iterations Setting the upper limit of the sampling value as The first assumed sampling value after power-up is acquired and set as Converting the assumed sampling value into a current signal, comparing the current signal with an actual current signal fed back by a capacitance sensor, and setting a second assumed sampling value as If the theoretical current value is smaller than the actual current value, the second assumed sampling value is set as Then converting the assumed sampling value into a current signal, repeating the above operation until the theoretical current value and the actual current value are smaller than the threshold value preset by the algorithm At this time The final value is acquired as the oil quantity sensor signal.
7. The method for measuring fuel based on the dual-channel time-sharing sampling control according to claim 4, wherein the calculating the fuel amount according to the fuel sensor signal sampling value and the set stable limiting value specifically comprises: according to the chase algorithm of dynamic adjustment of amplitude limiting, the sampling value of the current oil quantity sensor is set as The sampling value of the previous oil quantity sensor is The stable limiting value is , The value of (2) is determined according to the oil consumption speed of the aircraft, and the oil quantity is regulated according to the stable limiting value under the ground and cruising postures Change the flying attitude of the vehicle, if The clipping value is dynamically adjusted to The processed oil mass sensor sampling value is If (1) The clipping value is dynamically adjusted to The processed oil mass sensor sampling value is 。

Description

Fuel oil measurement system and method based on double-channel time-sharing sampling control Technical Field The invention relates to the technical field of aviation fuel measurement, in particular to a fuel measurement system and method based on double-channel time-sharing sampling control. Background At present, in order to improve the reliability of the fuel measurement computer, the dual redundancy design is generally adopted, two common design methods are adopted, one of the common design methods is that a main/auxiliary two sets of acquisition boards are arranged in the fuel measurement computer, an arbitration board is additionally arranged, and after the power is applied, the main board in the fuel measurement computer starts to perform the signal acquisition, processing, calculation and other works of the fuel sensor, and the auxiliary board is in a waiting state. In the working process, if the main board card fails, the arbitration board card sends out a main/auxiliary switching instruction, at the moment, the main board card stops all work, and the auxiliary board card starts to perform the work of signal acquisition, processing, calculation and the like of the oil quantity sensor. The method has the advantages that the switching of the two acquisition boards is determined by the arbitration board, risk of risk competition does not exist, but the method has the defects that the working modes of the two boards belong to cold backup, only one board works at the same time, the arbitration board is additionally arranged, and more computer hardware resources are consumed under the condition of completing the same work. And the other is that only two sets of acquisition boards of a main board and an auxiliary board are arranged in the fuel measuring computer, after the power is on, the main board and the auxiliary board in the fuel measuring computer all start to perform signal acquisition, processing, calculation and the like of the fuel sensor, but the main board and the auxiliary board only can respectively complete signal acquisition of half of the fuel sensor, and the acquired fuel sensor information is interacted through communication among the boards, so that complete fuel sensor data is obtained, and finally an accurate fuel value is calculated. The method has the advantages that the two acquisition boards are simple in structure and do not interfere with each other, but the method has the defects that the two boards can only acquire half of the oil quantity sensor, and if a single board fails, the information of the half of the oil quantity sensor is lost, and the accuracy of fuel measurement is degraded. Disclosure of Invention Aiming at the problems that two boards of the existing fuel measuring method can only collect half of the fuel quantity sensor, if a single board fails, the information of the half of the fuel quantity sensor is lost, and the accuracy of fuel measurement is degraded, the invention provides a fuel measuring system and method based on double-channel time-sharing sampling control; the dual-channel time-sharing sampling control module comprises an A acquisition board card and a B acquisition board card which have the same structure, wherein an MOS tube and an optocoupler device are used by the dual-channel time-sharing sampling control module and are matched with control signals of the CPU processing module to perform cross time-sharing acquisition on two groups of external oil sensors, the CPU processing module outputs signals to control the dual-channel time-sharing sampling control circuit, the oil sensor acquisition channel change-over switch and the oil sensor signal acquisition module to work, process and calculate data of the oil sensors and convert the data into fuel oil, the oil sensor acquisition channel change-over switch sequentially accesses the external multi-channel oil sensors into the oil sensor signal acquisition module, and the oil sensor signal acquisition module converts capacitance signals of the oil sensors into voltage signals and sends the voltage signals to the CPU processing module to perform data calculation, so that dual-redundancy fuel oil measurement is realized. The invention has the following specific implementation contents: the fuel oil measuring system based on the double-channel time-sharing sampling control comprises an A acquisition board and a B acquisition board, wherein the A acquisition board and the B acquisition board respectively comprise a double-channel time-sharing sampling control module, a CPU processing module, an oil quantity sensor acquisition channel change-over switch and an oil quantity sensor signal acquisition module; The acquisition board A is connected with the acquisition channel change-over switch of the oil quantity sensor; The oil quantity sensor acquisition channel change-over switch is connected with the double-channel time-sharing sampling control module and the CPU processing module; the input end of the