CN216593667U - Oil mass measuring system based on capacitive oil mass sensor - Google Patents
Oil mass measuring system based on capacitive oil mass sensor Download PDFInfo
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- CN216593667U CN216593667U CN202122743613.2U CN202122743613U CN216593667U CN 216593667 U CN216593667 U CN 216593667U CN 202122743613 U CN202122743613 U CN 202122743613U CN 216593667 U CN216593667 U CN 216593667U
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Abstract
The utility model discloses an oil mass measuring system based on a capacitive oil mass sensor, which comprises an FPGA, a digital bridge acquisition circuit, a plurality of oil mass sensors, an analog switch D3 and an analog switch D4, wherein the digital bridge acquisition circuit is connected with the FPGA; the digital bridge acquisition circuit comprises an analog switch D1, a phase compensation circuit and an analog switch D2 which are sequentially connected from front to back, and the FPGA is respectively connected with the analog switch D1, the analog switch D4 and the phase compensation circuit; the oil quantity measuring computer is respectively connected with the oil quantity sensors through an analog switch D3; the output ends of the oil quantity sensors are respectively connected with an analog switch D4, the analog switch D4 is connected with an analog switch D1, and the analog switch D1 is used for connecting the capacitance signals of the oil quantity sensors in parallel with the corresponding phase compensation circuits. The utility model realizes accurate compensation of different oil sensors through the phase compensation circuit, and has better practicability.
Description
Technical Field
The utility model belongs to the technical field of oil mass measuring equipment, and particularly relates to an oil mass measuring system based on a capacitive oil mass sensor.
Background
The capacitive oil mass sensor is widely used for measuring the oil mass of an airplane at present, and has the remarkable advantages of simple and reliable structure, good measurement stability, higher reliability, mature technology and the like. The capacitance value output by the capacitance type oil mass sensor is in a linear proportional relation with the oil immersion height, the oil immersion height can be calculated by measuring the output capacitance value of the capacitance type oil mass sensor, and the oil mass of the aircraft oil tank is calculated by combining the oil immersion heights of all the capacitance type oil mass sensors distributed in the aircraft oil tank.
In the actual installation use process, the capacitance signal that capacitanc oil mass sensor output easily receives electromagnetic interference, and capacitance signal transmission needs to use shielded cable shielding interference signal. The shielded cable is used for inevitably generating the distributed capacitance, and the oil quantity measuring computer can superimpose the distributed capacitance of the cable to the capacitance value of the acquired capacitive oil quantity sensor when acquiring the capacitive oil quantity sensor, so that the calculated immersion oil height of the capacitive oil quantity sensor is distorted. Meanwhile, the capacitance type oil quantity sensors are widely distributed in an airplane oil tank, and the lengths of the capacitance signals of the different capacitance type oil quantity sensors to the measuring cable branches of the oil quantity measuring computer are not consistent, so that the capacitance distribution on the capacitance signals of the capacitance type oil quantity sensors superposed on the measuring cable branches is not consistent and has larger difference.
In the actual installation use process, the bigger the fuel tank of the airplane is, the more the capacitive fuel quantity sensors are distributed, and the larger the measurement error caused by the distributed capacitance superposed by the measuring cable branches is. In order to ensure the accuracy of oil quantity measurement, zero value calibration and full value calibration of the whole aircraft are required, and capacitance values of the capacitance type oil quantity sensor are measured in the empty oil state and the full oil state of the aircraft respectively and are used as measuring references. After the oil quantity measuring computer is replaced, zero value and full value calibration of the whole machine are required to be carried out once. The zero value and full value calibration of the whole machine has obvious defects, and on one hand, the calibrated fuel cannot be reused, so that the economic waste is large; and on the other hand, the workload of measuring and maintaining the oil quantity of the airplane is also greatly increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an oil mass measuring system based on a capacitive oil mass sensor, which can realize accurate compensation on different oil mass sensors through a phase compensation circuit so as to facilitate the subsequent accurate calculation of oil mass data and has better practicability.
The utility model is mainly realized by the following technical scheme:
an oil mass measuring system based on a capacitive oil mass sensor comprises an FPGA, a digital bridge acquisition circuit, a plurality of oil mass sensors, an analog switch D3 and an analog switch D4; the digital bridge acquisition circuit comprises an analog switch D1, a phase compensation circuit and an analog switch D2 which are sequentially connected from front to back, and the FPGA is respectively connected with the analog switch D1-the analog switch D4 and the phase compensation circuit; the oil quantity measuring computer is respectively connected with the oil quantity sensors through analog switches D3 and is used for realizing time-sharing excitation of the oil quantity sensors; the output ends of the oil quantity sensors are respectively connected with an analog switch D4, and the analog switch D4 is connected with an analog switch D1; the analog switch D1 is used for connecting the capacitance signal of the oil mass sensor with the corresponding phase compensation circuit in parallel, and the analog switch D2 is used for outputting the compensated capacitance signal.
In the using process, the oil quantity measuring computer uses a multi-path analog switch to output excitation signals to different capacitance type oil quantity sensors in a time-sharing mode according to a specified sequence, the capacitance type oil quantity sensors feed capacitance signals back to the oil quantity measuring computer through measuring cables in sequence, meanwhile, the oil quantity measuring computer calculates the distributed capacitance value of the measuring cable branches superposed to a measuring end according to the length of the measuring cable branches through which the capacitance signals of the capacitance type oil quantity sensors pass, a phase compensation circuit is additionally arranged in a digital bridge measuring circuit in the oil quantity measuring computer to accurately compensate the different capacitance type oil quantity sensors respectively, and the compensated capacitance signals of the capacitance type oil quantity sensors are sent to a data processing module to be collected and calculated, so that oil quantity data can be calculated accurately and subsequently, and the oil quantity measuring computer has good practicability. The FPGA, the analog switch D1-the analog switch D4, and the potentiometer are all in the prior art, are commercially available products, and are not the main improvement point of the present application, and therefore are not described again.
In order to better implement the present invention, further, the phase compensation circuit is provided with a plurality of phase compensation channels corresponding to the plurality of oil sensors, and the analog switch D1 is used for sending the capacitance signal of the oil sensor to the corresponding phase compensation channel.
In order to better implement the present invention, further, the oil quantity sensor is provided with 4, and the phase compensation circuit is correspondingly provided with 4 phase compensation channels.
In order to better implement the utility model, further, the phase compensation circuit is provided with a plurality of potentiometers corresponding to the plurality of oil mass sensors, and the potentiometers are used for respectively controlling the amplitude of the limiting compensation of the capacitance signals of the plurality of oil mass sensors according to the distributed capacitance size superposed by the measuring cable branches of the oil mass sensors.
In order to better implement the present invention, further, the phase compensation circuit includes several capacitors for setting the maximum amplitude of the phase compensation channel, and potentiometers for controlling the actual amplitude of the phase compensation channel.
In order to better implement the present invention, further, the analog switch D2 is used to return the capacitance signal of the oil quantity sensor to the digital bridge measuring circuit of the oil quantity measuring computer and calculate the oil quantity data.
In the digital bridge measuring circuit of the fuel quantity measuring computer, an analog switch D1, an analog switch D2, and a phase compensating circuit composed of a capacitor and a potentiometer are provided. The oil quantity measuring computer realizes time-sharing excitation of the capacitive oil quantity sensor through the analog switch D3, the analog switch D4 controls the capacitance signals of the capacitive oil quantity sensor to be sequentially sent to the digital bridge acquisition circuit, and the analog switch D1 sequentially sends the capacitance signals of the capacitive oil quantity sensor to the corresponding phase compensation circuit for compensation. And the phase compensation circuit controls the amplitude of the capacitance signal phase compensation of the capacitance oil mass sensor through a potentiometer according to the distributed capacitance size superposed by the measuring cable branch of the capacitance oil mass sensor. After the compensation is completed, the capacitance signal of the capacitance type oil quantity sensor is returned to the digital bridge measuring circuit through the analog switch D2 to be collected and the oil immersion height of the capacitance type oil quantity sensor is calculated. The control work of the capacitance type oil quantity sensor such as excitation, acquisition, phase compensation and the like is uniformly realized by the FPGA.
The utility model has the beneficial effects that:
(1) according to the utility model, through the scheme of phase compensation adjustment, the distributed capacitance superposed by the measuring cable branches is counteracted, the consistency of the oil mass measuring computer is improved, and the influence of the superposed distributed capacitance of the measuring cable on the oil mass measurement is eliminated, so that the current situation that zero value and full value calibration must be carried out after the oil mass measuring system is installed or the oil mass measuring computer is replaced is solved, and the method has better practicability.
(2) The utility model compensates the distributed capacitance superposed by the measuring cable branches of the capacitive oil mass sensor by adding the phase compensation circuit, eliminates the influence of the distributed capacitance of the measuring cable on the oil mass measurement, and can realize that the oil mass measuring system is assembled without carrying out zero full position calibration.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a circuit diagram of a digital bridge acquisition circuit;
fig. 3 is a flow chart of the use of the present invention.
Detailed Description
Example 1:
an oil mass measuring system based on a capacitance type oil mass sensor is shown in figure 1 and comprises an FPGA, a digital bridge acquisition circuit, a plurality of oil mass sensors, an analog switch D3 and an analog switch D4; the digital bridge acquisition circuit comprises an analog switch D1, a phase compensation circuit and an analog switch D2 which are sequentially connected from front to back, and the FPGA is respectively connected with the analog switch D1-the analog switch D4 and the phase compensation circuit; the oil quantity measuring computer is respectively connected with the oil quantity sensors through analog switches D3 and is used for realizing time-sharing excitation of the oil quantity sensors; the output ends of the oil quantity sensors are respectively connected with an analog switch D4, and the analog switch D4 is connected with an analog switch D1; the analog switch D4 is used for sending the capacitance signal of oil mass sensor to digital bridge acquisition circuit in proper order, analog switch D1 is used for connecting in parallel the capacitance signal of oil mass sensor and the corresponding phase compensation circuit, analog switch D2 is used for outputting the capacitance signal after the compensation. The analog switch D2 is used to return the capacitance signal of the oil sensor to the digital bridge measuring circuit and calculate the oil data.
In the using process, the oil quantity measuring computer uses a multi-path analog switch to output excitation signals to different capacitance type oil quantity sensors in a time-sharing mode according to a specified sequence, the capacitance type oil quantity sensors feed capacitance signals back to the oil quantity measuring computer through measuring cables in sequence, meanwhile, the oil quantity measuring computer calculates the distributed capacitance value of the measuring cable branches superposed to a measuring end according to the length of the measuring cable branches through which the capacitance signals of the capacitance type oil quantity sensors pass, a phase compensation circuit is additionally arranged in a digital bridge measuring circuit in the oil quantity measuring computer to accurately compensate the different capacitance type oil quantity sensors respectively, and the compensated capacitance signals of the capacitance type oil quantity sensors are sent to a data processing module to be collected and calculated, so that oil quantity data can be calculated accurately and subsequently, and the oil quantity measuring computer has good practicability.
Example 2:
in this embodiment, optimization is performed on the basis of embodiment 1, as shown in fig. 2, the phase compensation circuit is provided with a plurality of phase compensation channels corresponding to a plurality of oil sensors, and the analog switch D1 is used to send capacitance signals of the oil sensors to the corresponding phase compensation channels.
Furthermore, the oil mass sensor is provided with 4, and the phase compensation circuit is correspondingly provided with 4 phase compensation channels.
Furthermore, the phase compensation circuit is provided with a plurality of potentiometers corresponding to a plurality of oil mass sensors, the potentiometers are used for controlling the amplitude of the capacitance signal limiting compensation of the plurality of oil mass sensors respectively according to the size of the distributed capacitance superposed by the measuring cable branches of the oil mass sensors.
Furthermore, the phase compensation circuit comprises a plurality of capacitors and potentiometers, wherein the capacitors are used for setting the maximum amplitude of the phase compensation channel, and the potentiometers are used for controlling the actual amplitude of the phase compensation channel.
In the digital bridge measuring circuit of the fuel quantity measuring computer, an analog switch D1, an analog switch D2, and a phase compensating circuit composed of a capacitor and a potentiometer are provided. The oil quantity measuring computer realizes time-sharing excitation of the capacitive oil quantity sensor through the analog switch D3, the analog switch D4 controls the capacitance signals of the capacitive oil quantity sensor to be sequentially sent to the digital bridge acquisition circuit, and the analog switch D1 sequentially sends the capacitance signals of the capacitive oil quantity sensor to the corresponding phase compensation circuit for compensation. And the phase compensation circuit controls the amplitude of the capacitance signal phase compensation of the capacitance oil mass sensor through a potentiometer according to the distributed capacitance size superposed by the measuring cable branch of the capacitance oil mass sensor. After the compensation is completed, the capacitance signal of the capacitance type oil quantity sensor is returned to the digital bridge measuring circuit through the analog switch D2 to be collected and the oil immersion height of the capacitance type oil quantity sensor is calculated. The control work of the capacitance type oil quantity sensor such as excitation, acquisition, phase compensation and the like is uniformly realized by the FPGA.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
in a fuel quantity measuring system based on a capacitive fuel quantity sensor, as shown in fig. 1 and 2, an analog switch D1, an analog switch D2, and a phase compensation circuit composed of a capacitor and a potentiometer are provided in a digital bridge measuring circuit in a fuel quantity measuring computer. The oil quantity measuring computer realizes the time-sharing excitation of the capacitance type oil quantity sensor through the analog switch D3, and the capacitance signals of the capacitance type oil quantity sensor are sequentially sent to the digital bridge acquisition circuit through the analog switch D4, so that the control condition of the accurate compensation of the capacitance signals of the capacitance type oil quantity sensor is provided.
After the capacitance signal of the capacitance type oil mass sensor is sent into the digital bridge acquisition circuit, the capacitance signal of the capacitance type oil mass sensor is connected with the corresponding phase compensation circuit in parallel through the analog switch D1, and the distributed capacitance superposed by the branch of the measuring cable through which the capacitance signal of the capacitance type oil mass sensor passes is offset through fine adjustment of the phase of the capacitance signal of the capacitance type oil mass sensor, so that the consistency of the capacitance signal of the capacitance type oil mass sensor is ensured.
After the capacitance signal of the capacitance type oil quantity sensor is subjected to phase compensation, the capacitance signal of the capacitance type oil quantity sensor is controlled to return to the digital bridge measuring circuit through the analog switch D2. The control work of the capacitance type oil quantity sensor such as excitation, acquisition, phase compensation and the like is uniformly realized by the FPGA control module. An embodiment of the digital bridge acquisition circuit of the present invention is shown in fig. 2.
The utility model realizes the time-sharing excitation of the capacitive oil mass sensor through the analog switch D3, and the analog switch D4 controls the capacitance signals of the capacitive oil mass sensor to be sequentially sent to the digital bridge acquisition circuit. The analog switch D1 controls the capacitive signal of the capacitive oil mass sensor to enter the corresponding phase compensation channel. The capacitor of the phase compensation circuit is used for setting the maximum amplitude of the corresponding phase compensation channel, and the potentiometer is used for controlling the actual amplitude of the corresponding phase compensation channel. The FPGA controls the control work of excitation, acquisition, phase compensation and the like of the whole capacitive oil mass sensor.
As shown in fig. 3, in the using process of the utility model, the FPGA firstly controls to open the excitation channel of the N number capacitive oil mass sensor of the analog switch D3, the excitation signal outputs the excitation signal to excite the capacitive oil mass sensor, the FPGA controls to close the analog switch D3 and open the capacitance signal return channel of the N number capacitive oil mass sensor of the analog switch D4, and the capacitance signal of the capacitive oil mass sensor is sent to the digital bridge acquisition module. The FPGA closes the analog switch D4 and opens the N phase compensation circuit channel of the analog switch D1, the FPGA closes the analog switch D1 and opens the N channel of the analog switch D2 after the phase compensation is completed, and the compensated capacitance signal of the capacitance oil mass sensor is returned to the digital bridge acquisition circuit to calculate the oil immersion height of the capacitance oil mass sensor and complete the oil mass calculation.
The distributed capacitance superposed by the measuring cable branches through which the capacitance signals of the capacitance type oil quantity sensor pass is offset through the phase compensation circuit, the consistency of the capacitance signals of the capacitance type oil quantity sensor is ensured, the zero position and the full position of the capacitance type oil quantity sensor are fixed and can be calibrated in a laboratory environment, zero full position calibration is not required to be carried out on an oil quantity measuring system, and the method has better practicability.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. An oil mass measuring system based on a capacitive oil mass sensor is characterized by comprising an FPGA, a digital bridge acquisition circuit, a plurality of oil mass sensors, an analog switch D3 and an analog switch D4; the digital bridge acquisition circuit comprises an analog switch D1, a phase compensation circuit and an analog switch D2 which are sequentially connected from front to back, and the FPGA is respectively connected with the analog switch D1-the analog switch D4 and the phase compensation circuit; the oil quantity measuring computer is respectively connected with the oil quantity sensors through analog switches D3 and is used for realizing time-sharing excitation of the oil quantity sensors; the output ends of the oil quantity sensors are respectively connected with an analog switch D4, and the analog switch D4 is connected with an analog switch D1; the analog switch D1 is used for connecting the capacitance signal of the oil mass sensor with the corresponding phase compensation circuit in parallel, and the analog switch D2 is used for outputting the compensated capacitance signal.
2. The oil mass measuring system based on the capacitive oil mass sensor as claimed in claim 1, wherein the phase compensation circuit is provided with a plurality of phase compensation channels corresponding to a plurality of oil mass sensors, and the analog switch D1 is used for sending the capacitance signal of the oil mass sensor to the corresponding phase compensation channel.
3. The oil quantity measuring system based on the capacitive oil quantity sensor is characterized in that 4 oil quantity sensors are arranged, and 4 phase compensation channels are correspondingly arranged in the phase compensation circuit.
4. The oil mass measuring system based on the capacitive oil mass sensor as claimed in claim 2, wherein the phase compensation circuit is provided with a plurality of potentiometers corresponding to the plurality of oil mass sensors, and the potentiometers are used for controlling the amplitude of the limiting compensation of the capacitance signals of the plurality of oil mass sensors respectively according to the distributed capacitance size superposed by the measuring cable branches of the oil mass sensors.
5. The capacitive fuel quantity sensor-based fuel quantity measuring system according to claim 4, wherein the phase compensation circuit comprises a plurality of capacitors and potentiometers, the capacitors are used for setting the maximum amplitude of the phase compensation channel, and the potentiometers are used for controlling the actual amplitude of the phase compensation channel.
6. The capacitive fuel quantity sensor based fuel quantity measuring system of claim 1, wherein said analog switch D2 is used to return the fuel quantity sensor capacitance signal to the digital bridge measuring circuit of the fuel quantity measuring computer and calculate the fuel quantity data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122743613.2U CN216593667U (en) | 2021-11-10 | 2021-11-10 | Oil mass measuring system based on capacitive oil mass sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122743613.2U CN216593667U (en) | 2021-11-10 | 2021-11-10 | Oil mass measuring system based on capacitive oil mass sensor |
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| CN216593667U true CN216593667U (en) | 2022-05-24 |
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| CN202122743613.2U Active CN216593667U (en) | 2021-11-10 | 2021-11-10 | Oil mass measuring system based on capacitive oil mass sensor |
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- 2021-11-10 CN CN202122743613.2U patent/CN216593667U/en active Active
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