CN114062809A - Design method for signal integrity of fuel oil measurement cable - Google Patents
Design method for signal integrity of fuel oil measurement cable Download PDFInfo
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- CN114062809A CN114062809A CN202111328229.4A CN202111328229A CN114062809A CN 114062809 A CN114062809 A CN 114062809A CN 202111328229 A CN202111328229 A CN 202111328229A CN 114062809 A CN114062809 A CN 114062809A
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- 239000000295 fuel oil Substances 0.000 title claims abstract description 112
- 238000005259 measurement Methods 0.000 title claims abstract description 37
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- 238000013461 design Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000003321 amplification Effects 0.000 claims abstract description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 3
- 239000004020 conductor Substances 0.000 claims description 30
- 238000012937 correction Methods 0.000 claims description 26
- 239000000446 fuel Substances 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 13
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 238000011161 development Methods 0.000 description 6
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- 230000005540 biological transmission Effects 0.000 description 5
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- 239000011241 protective layer Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a design method for signal integrity of a fuel oil measuring cable, which comprises the following steps: 1, a fuel oil measuring computer signal generating circuit generates a trigger signal, the trigger signal is converted into a voltage signal after conversion and amplification, and the voltage signal passes through a channel switching control circuit; 2) the load is continuously output through the fuel oil measuring cable, at the moment, the load can generate a feedback signal, the feedback signal is fed back to the fuel oil measuring computer through the fuel oil measuring cable, and the fuel oil measuring computer collects the feedback signal; 3) the fuel oil measurement computer processes the feedback signal, and the processed feedback signal continuously corrects the load feedback signal through the fuel oil measurement cable, so that the consistency and the integrity of the load feedback signal are ensured. The invention provides a brand new design method of a fuel oil measuring cable, which reduces the workload, reduces the weight of the fuel oil measuring cable, simplifies the manufacturing difficulty of the fuel oil measuring cable and improves the production efficiency.
Description
Technical Field
The invention relates to the technical field of fuel oil measuring cables, in particular to a design method for signal integrity of a fuel oil measuring cable.
Background
With the rapid development of electronic and communication technologies, airborne equipment of airplanes is continuously updated, the integration scale is larger and larger, the clock rate is higher and higher, the signal edge rate is higher and higher, and the communication rate between the airborne equipment is also continuously improved, so that a complex electromagnetic environment with various signal interweaving, dense overlapping and dynamic overlapping is formed in the limited space of airplanes. The fuel oil measuring cable is guaranteed to meet various functional performance indexes in a complex electromagnetic environment, and transmission signals of the fuel oil measuring cable designed in a traditional mode are often easily interfered in the complex electromagnetic environment, so that the fuel oil measuring cable is prevented from being interfered in the complex electromagnetic environment of an airplane, and the consistency and the integrity of the signals are kept to have very important significance for an airplane measurement and control system.
The aircraft fuel measurement cable is a link for realizing mutual cross-linking of the fuel measurement and control computer and the sensor, and because the trigger signal, the feedback signal and the feedback correction signal are transmitted through the fuel measurement cable, the transmission signals are ensured not to be distorted when passing through the fuel measurement cable, and the consistency and the integrity of the transmission signals can be ensured to have important significance for the precision, the replaceability and the like of the fuel measurement and control system.
The traditional fuel oil measuring cable uses single-core wires for trigger signals and load feedback signals, the trigger signal wires and the feedback signal wires are twisted together, and then the twisted wires are grounded and shielded by a metal wave-proof sleeve, although the traditional fuel oil measuring cable can protect some external electromagnetic waves to a certain extent, the mutual interference between the wires in the wave-proof sleeve can not be avoided, the trigger signal wires can generate interference on the feedback signal wires,
as shown in fig. 1, a differential voltage exists between the trigger signal conductor AB and the feedback signal conductor CD, which is the noise that each signal must generate to perform its function, when the UC signal level on the trigger signal conductor AB changes, crosstalk, i.e., noise, is generated on its adjacent feedback signal conductor through mutual inductive coupling, and the electric field strength generated by the noise is proportional to the square of the frequency, the magnitude of the current, and the circuit loop area formed between the trigger signal conductor and the feedback signal conductor. The faster the UC signal level edge change rate, the greater the noise it produces, which may cause serious distortion of the IC signal on the feedback signal conductor in case of serious, resulting in the failure of the fuel measurement computer to effectively collect the feedback signal, even serious consequences such as mis-collection, mis-sending, mis-operation, etc. With the development of information broadband and high speed, the former low-frequency signal can not meet the requirement of increasing informatization development, the requirement of the airplane on timeliness and accuracy of a measurement and control system is continuously improved, the transmission and processing speed of the signal is required to be faster and faster, the application of the corresponding high-frequency signal is wider and wider, the design is more and more complex, so that the fuel oil measuring cable designed in the traditional mode can not adapt to the development requirement of the modern airplane, and the development of a brand-new fuel oil measuring cable capable of adapting to the development requirement of the modern airplane is imperative.
Disclosure of Invention
The invention aims to provide a design method for signal integrity of a fuel oil measuring cable, which does not need zero-full calibration, reduces the workload, reduces the weight of the fuel oil measuring cable, simplifies the manufacturing difficulty of the fuel oil measuring cable and improves the production efficiency.
The invention is realized by the following technical scheme: a design method for signal integrity of a fuel oil measurement cable is characterized by comprising the following steps:
(1) the fuel oil measuring computer signal generating circuit generates a trigger signal, the trigger signal is converted into a voltage signal after conversion and amplification, and the voltage signal passes through the channel switching control circuit;
(2) the load is continuously output through the fuel oil measuring cable, at the moment, the load can generate a feedback signal, the feedback signal is fed back to the fuel oil measuring computer through the fuel oil measuring cable, and the fuel oil measuring computer collects the feedback signal;
(3) the fuel oil measurement computer processes the feedback signal, and the processed feedback signal continuously corrects the load feedback signal through the fuel oil measurement cable, so that the consistency and the integrity of the load feedback signal are ensured.
The working principle of the technical scheme is that when two load feedback lines are placed in parallel and are close to each other, large parasitic capacitance and mutual inductance can be generated between the two load feedback wires, crosstalk is easy to send, and the strength of capacitive coupling is directly proportional to the frequency, the resistance of the wires to the ground and the capacitance between the two load feedback wires at low frequency; the capacitive coupling strength at high frequency mainly depends on the capacitance formed between the two load feedback wires, so that the closer the wires are to each other, the higher the signal frequency on the wires is, the larger the parasitic capacitance formed between the wires is, and the stronger the capacitive coupling strength between the wires is, the more serious the generated crosstalk is. Based on the above principle, when a load is added to the fuel measurement cable and the fuel measurement computer starts to trigger, a feedback signal is inevitably generated on a feedback wire adjacent to the collected load feedback signal wire, only the fuel measurement computer does not collect the feedback signal on the adjacent feedback wire at the moment, but the feedback signal on the adjacent feedback wire is subjected to capacitive coupling, so that the collection of the load feedback signal by the fuel measurement computer is influenced. Therefore, in order to prevent the interference, a protective layer is added outside the load feedback signal, namely the load feedback signal is changed into a single-core shielding wire, so that the interference of adjacent wires to the single-core shielding wire is prevented, but the shielding layer of the single-core shielding wire is not grounded, the load feedback signal is shielded and corrected through a feedback correction signal of a fuel oil measuring computer, the adjacent load feedback signal is isolated and shielded, and the interference interaction between the load feedback signal wires is prevented. After the fuel oil measuring cable is redesigned, multiple tests show that the influence on the load feedback signal collected by the fuel oil measuring computer is very small before and after the load (sensor) is added or reduced on the fuel oil measuring cable, and the influence is within a controllable range. The purpose is proved to be achieved.
According to the above, the load feedback signal conductor of the fuel oil measuring cable is changed from the original single-core line to the single-core shielding conductor, and the aim is achieved. Whether the signal is a voltage signal or a current signal, the signal finally reflected on the lead is in the form of current, because the feedback correction signal driving power of the fuel oil measuring computer is limited, the feedback correction is carried out in a constant current mode, often, fuel measurement cables are relatively long, the load is distributed at different locations on the fuel measurement cable, this results in unequal distances between the shield of the feedback signal conductor and the fuel measurement computer, as the shield is of different length, cross-sectional area, therefore, when the feedback correction signal is used for correcting the load feedback signal, the charge density distributed on the wire shielding layer of the feedback correction signal is different, therefore, the effect of the feedback correction signal on the load feedback signal correction is different, which causes the same load (sensor) to be connected at different positions of the fuel oil measuring cable, and the feedback signal collected by the fuel oil measuring computer is greatly different. Because the loads are distributed at different positions of the fuel oil measuring cable, the distances between the loads and the fuel oil measuring computer cannot be guaranteed to be the same, in order to solve the problem, the feedback correction signals are used for simultaneously correcting all load feedback signals, namely, shielding layers of all load feedback signal leads are in short circuit and are driven by the feedback correction signals at the same time, and the feedback correction signals are used for correcting all load feedback signals no matter the fuel oil measuring computer collects the load feedback signals of the path, so that the aim of achieving the same correction effect of the loads at different positions is fulfilled. According to the design, through repeated tests, the same load (sensor) is connected to different positions of the fuel oil measuring cable, and the feedback signals collected by the fuel oil measuring computer are the same, so that the expected purpose is achieved.
In order to better implement the method of the invention, further, the fuel oil measuring cable trigger signal conductor is completely separated from the load feedback signal conductor through the grounding wave-proof sleeve.
In order to better implement the method of the invention, further, the outermost layer of all the load feedback signal wires is sleeved with a grounding wave-proof sleeve.
In order to better implement the method of the present invention, further, the wave-proof sleeve needs to be well connected with the chassis by means of a ring connection.
In order to better implement the method of the invention, further, the load feedback signal conductor is changed into a single-core shielding conductor.
In order to better realize the method of the invention, the shielding layers of all load feedback signal leads are short-circuited and are simultaneously driven by feedback correction signals, and the feedback correction signals correct all load feedback signals no matter the fuel oil measuring computer collects the load feedback signals of the path.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a brand new design method of a fuel oil measuring cable, which can effectively utilize limited hardware resources to realize the integrity of a fuel oil measuring cable transmission signal so as to improve the measurement precision of a fuel oil measuring and controlling system.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a simplified schematic diagram of a conventional fuel measurement cable;
FIG. 2 is a schematic diagram illustrating a principle of the present invention based on mutual interference between a trigger signal and a load feedback signal;
FIG. 3 is a schematic diagram of a priori principles of the present invention for achieving signal integrity of a fuel measurement cable;
FIG. 4 is a final schematic diagram of the present invention for achieving signal integrity of the fuel metering cable;
FIG. 5 is a schematic block diagram of a fuel measurement and control system according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The present invention will be described in further detail with reference to the following examples for the purpose of making clear the objects, process conditions and advantages of the present invention, but the embodiments of the present invention are not limited thereto, and various substitutions and modifications can be made according to the common technical knowledge and the conventional means in the art without departing from the technical idea of the present invention described above, and the specific examples described herein are only for explaining the present invention and are not intended to limit the present invention.
Example 1:
the technical objects to be achieved by the present embodiment are as follows:
a) before and after the quantity of other loads (sensors) on the fuel oil measuring cable is changed, the load feedback signal collected by the fuel oil measuring computer at the moment is not influenced.
b) The same load (sensor) is connected to different positions of the fuel oil measuring cable, and the feedback signals collected by the fuel oil measuring computer are the same;
to achieve the technical purpose, the technical scheme is as follows: the fuel oil measuring cable trigger signal conductor is completely separated from the load feedback signal conductor through the grounding wave-proof sleeve, as shown in figure 2, the interference of the trigger signal conductor to the load feedback signal conductor is prevented, and the interference of the complex electromagnetic environment on the machine to the signal is prevented, so that the trigger signal sent by the fuel oil measuring computer is ensured not to interfere with the load feedback signal.
Because the feedback signal wires of the load are increased along with the increase of the number of the loads, and meanwhile, in order to reduce the weight of the fuel oil measuring cable, the outermost layer of all the load feedback signal wires is sleeved with a grounding wave-proof sleeve to prevent the interference of a trigger signal of a fuel oil measuring computer, the measures only ensure that the load feedback signals are not influenced by the trigger signal and cannot prevent the interference of all the load feedback signal wires, and the specific design scheme of the fuel oil measuring cable is detailed below based on two purposes of the invention.
a) In order to achieve the purpose that before and after the quantity of other loads (sensors) on the fuel oil measuring cable is changed, load feedback signals collected by a fuel oil measuring computer at the moment are not influenced, multiple tests verify that when two load feedback lines are placed in parallel and are close to each other, larger parasitic capacitance and mutual inductance can be generated between the two load feedback wires, crosstalk is easy to send, and the strength of capacitive coupling is directly proportional to the frequency, the resistance of the wires to the ground and the capacitance between the two load feedback wires at low frequency; the capacitive coupling strength at high frequency mainly depends on the capacitance formed between the two load feedback wires, so that the closer the wires are to each other, the higher the signal frequency on the wires is, the larger the parasitic capacitance formed between the wires is, and the stronger the capacitive coupling strength between the wires is, the more serious the generated crosstalk is. Based on the above principle, when a load is added to the fuel measurement cable and the fuel measurement computer starts to trigger, a feedback signal is inevitably generated on a feedback wire adjacent to the collected load feedback signal wire, only the fuel measurement computer does not collect the feedback signal on the adjacent feedback wire at the moment, but the feedback signal on the adjacent feedback wire is subjected to capacitive coupling, so that the collection of the load feedback signal by the fuel measurement computer is influenced. Therefore, in order to prevent the interference, a protective layer is added outside the load feedback signal, namely the load feedback signal is changed into a single-core shielding wire (as shown in figure 3) to prevent adjacent wires from crosstalk to the single-core shielding wire, but the shielding layer of the single-core shielding wire is not grounded, but the feedback correction signal of the fuel oil measurement computer is used for shielding and correcting the load feedback signal, so that the adjacent load feedback signal wires are isolated and shielded, and the crosstalk interaction between the load feedback signal wires is prevented. After the fuel oil measuring cable is redesigned, multiple tests show that the influence on the load feedback signal collected by the fuel oil measuring computer is very small before and after the load (sensor) is added or reduced on the fuel oil measuring cable, and the influence is within a controllable range. The purpose is proved to be achieved.
b) According to the above, the load feedback signal conductor of the fuel oil measuring cable is changed from the original single-core wire to the single-core shielding conductor, and although the purpose of the invention a) is realized, a new problem is found in the verification test process, namely, when the same load is different in position on the fuel oil measuring cable, namely, when the distance from the fuel oil measuring computer is different, the load feedback signal collected by the fuel oil measuring computer is different. The second purpose of the invention is that "the same load (sensor) is connected to different positions of the fuel oil measuring cable, the feedback signal collected by the fuel oil measuring computer is the same", the signal is represented on the lead in the form of current no matter whether it is a voltage signal or a current signal, because the feedback correction signal of the fuel oil measuring computer has limited driving power and performs feedback correction in the form of constant current, the fuel oil measuring cable is often longer, the load is distributed on different positions of the fuel oil measuring cable, which results in unequal distances between the shielding layer of the feedback signal lead and the fuel oil measuring computer, and because the shielding layer has different lengths and different sectional areas, the feedback correction signal has different charge densities distributed on the shielding layer of the lead when correcting the load feedback signal, so the effect of the feedback correction signal on the load feedback signal is different, this results in the same load (sensor) being connected to different locations of the fuel measuring cable, and the feedback signal collected by the fuel measuring computer is significantly different. Because the loads are distributed at different positions of the fuel oil measuring cable, the distances between the loads and the fuel oil measuring computer cannot be guaranteed to be the same, in order to solve the problem, the feedback correction signals are used for simultaneously correcting all load feedback signals, namely, shielding layers of all load feedback signal leads are in short circuit connection (shown in figure 4), the feedback correction signals are driven simultaneously, and the feedback correction signals correct all load feedback signals no matter the fuel oil measuring computer collects the load feedback signals of the path, so that the aim of achieving the same correction effect of the loads at different positions is fulfilled. According to the design, through repeated tests, the same load (sensor) is connected to different positions of the fuel oil measuring cable, and the feedback signals collected by the fuel oil measuring computer are the same, so that the expected purpose is achieved.
As shown in figure 5, a fuel oil measuring computer generates a trigger signal with constant frequency through a signal generating circuit inside the computer, the trigger signal is converted and amplified by the fuel oil measuring computer to form a voltage signal, the voltage signal is output from the fuel oil measuring computer after passing through a channel switching control circuit, the output voltage trigger signal continuously outputs to a load through a trigger signal lead of a fuel oil measuring cable, at the moment, the load generates a feedback signal, the feedback signal is fed back to the fuel oil measuring computer through a feedback signal lead of the fuel oil measuring cable, the fuel oil measuring computer collects a load feedback signal through a collection and conversion circuit, the fuel oil measuring computer processes the feedback signal through a feedback processing circuit, the processed feedback signal continuously corrects the load feedback signal through the fuel oil measuring cable, and the corrected feedback signal is fed back to the fuel oil measuring computer through a feedback signal lead of the fuel oil measuring cable for collection And the integrated conversion circuit is finally sent to a digital signal processing unit of the fuel oil measuring computer for acquisition and processing.
The principle of collecting single load is summarized, when there are multiple loads, the principle of the fuel oil measuring computer is not changed, and only the channel switching control circuit switches and collects each load, but the fuel oil measuring cables are different, the feedback correction signal of the fuel oil measuring computer needs to drive all load feedback signals simultaneously, namely the fuel oil measuring cables connect the shielding layers of all feedback signal conductors as shown in fig. 4, and simultaneously isolate the trigger signal conductor and the load feedback signal conductor through the wave-proof sleeve, so as to prevent the conductors from interfering with each other. When the fuel oil measuring cable is manufactured in a concrete implementation mode, the weaving density of the wave-proof sleeve and the shielding layer is required to be ensured, the protection effect is better when the weaving density is higher, the continuity of the fuel oil measuring cable is ensured, no fault exists, no exposed lead is exposed, and the wave-proof sleeve is required to be well connected with the shell in an annular connection mode so as to ensure that the expected purpose is achieved.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A design method for signal integrity of a fuel oil measurement cable is characterized by comprising the following steps:
(1) the fuel oil measuring computer signal generating circuit generates a trigger signal, the trigger signal is converted into a voltage signal after conversion and amplification, and the voltage signal passes through the channel switching control circuit;
(2) the load is continuously output through the fuel oil measuring cable, at the moment, the load can generate a feedback signal, the feedback signal is fed back to the fuel oil measuring computer through the fuel oil measuring cable, and the fuel oil measuring computer collects the feedback signal;
(3) the fuel oil measurement computer processes the feedback signal, and the processed feedback signal continuously corrects the load feedback signal through the fuel oil measurement cable, so that the consistency and the integrity of the load feedback signal are ensured.
2. The method of claim 1, wherein the fuel gauging cable trigger signal conductor is completely separated from the load feedback signal conductor by a grounded grommet.
3. The design method for the signal integrity of the fuel oil measuring cable according to claim 2, wherein a grounding wave-proof sleeve is sleeved on the outermost layer of all the load feedback signal conductors.
4. The design method for signal integrity of the fuel oil measuring cable according to claim 3, wherein the wave-proof sleeve is connected with the housing ground in a good manner by a ring connection.
5. The design method for fuel oil measurement cable signal integrity according to claim 4, wherein the load feedback signal conductor is changed into a single-core shielding conductor.
6. The design method for the signal integrity of the fuel oil measurement cable according to claim 5, wherein the shielding layers of all load feedback signal conductors are short-circuited and are simultaneously driven by feedback correction signals, and the feedback correction signals correct all load feedback signals no matter which load feedback signals of the path are collected by the fuel oil measurement computer.
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| CN214471166U (en) * | 2021-03-10 | 2021-10-22 | 深圳市南航电子工业有限公司 | Fuel oil detection system |
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2021
- 2021-11-10 CN CN202111328229.4A patent/CN114062809B/en active Active
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| KR20030033140A (en) * | 2001-10-17 | 2003-05-01 | 씨멘스 오토모티브 주식회사 | A fuel detecting system in car |
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