CN109269398B - Design method of signal conditioning circuit of digital angular displacement sensor - Google Patents
Design method of signal conditioning circuit of digital angular displacement sensor Download PDFInfo
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- CN109269398B CN109269398B CN201811204438.6A CN201811204438A CN109269398B CN 109269398 B CN109269398 B CN 109269398B CN 201811204438 A CN201811204438 A CN 201811204438A CN 109269398 B CN109269398 B CN 109269398B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
The invention relates to a design method of a signal conditioning circuit of a digital angular displacement sensor, and relates to the technical field of power device control. The invention has the following advantages and positive effects: 1. the signal quality of the sensor such as excitation, output and the like is improved, the adverse effects such as temperature drift and the like are eliminated, and the system control performance is improved. 2. The analog-to-digital conversion mode of the output signals of the sensor is more stable in acquisition, the precision is improved, and the design is simplified. 3. And the system joint debugging process is optimized, and the test efficiency is improved. 4. The types and the number of components are reduced, the manufacturing cost is reduced, and meanwhile, the reliability is improved.
Description
Technical Field
The invention relates to the technical field of power device control, in particular to a design method of a signal conditioning circuit of a digital angular displacement sensor.
Background
The angular displacement sensor is an important component in the fuel supply regulator of the missile-used engine, is used for measuring the actual fuel flow of the engine, is one of feedback signals of a closed-loop control system, and the working stability of a signal conditioning circuit of the angular displacement sensor is important in engine control. The angular displacement sensor assembly is connected with the main regulating valve in a gear and rack structure, so that the stroke position of the main valve corresponds to different corner positions of the angular displacement sensor, and the angular displacement sensor outputs voltage signals according to the different corner positions, and the output voltage signals reflect the position and the opening degree of the main valve and indirectly characterize the oil supply flow of the engine. The compensation signal is used to feed back the compensation excitation signal to counteract the output signal waveform variation caused by the external environment, and the signal waveform is generally shown in fig. 4, in which:
t: waveform period, s;
f: waveform frequency, 1/T, Hz;
ui: the excitation signal amplitude, V;
and UO: outputting a signal amplitude, V;
ub: compensating for signal amplitude, V;
the angular displacement sensor has a complex signal conditioning process, the conventional circuit is completely realized by an analog circuit, the design difficulty is high, the conventional circuit uses a large number of discrete components such as resistors, capacitors and transistors, the improvement of the component precision and the temperature coefficient is limited, and the circuit performance is difficult to keep stable under the severe condition of the environment for elasticity; meanwhile, the output signal of the sensor is converted from alternating current to direct current by an analog circuit, so that the error is large, and the system precision is not improved; in addition, in the production process of the circuit, the debugging of each parameter only depends on an adjustable resistor or a potentiometer, the debugging process is too complicated, and the production efficiency is extremely low; moreover, the cost is high due to the fact that the number and the type of the discrete components are large, and the failure rate of components such as a potentiometer is high, so that the improvement of the reliability of the product is limited.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to provide a design method of a signal conditioning circuit of a digital angular displacement sensor.
(II) technical scheme
In order to solve the technical problem, the invention provides a design method of a signal conditioning circuit of a digital angular displacement sensor, which comprises the following steps:
step 1, generating an excitation signal of an angular displacement sensor by a digital control operation circuit;
step 2, acquiring output and compensation signals of the angular displacement sensor based on an excitation signal of the angular displacement sensor;
Preferably, in step 1, the digital control arithmetic circuit is designed to calculate the amplitude Ui of the excitation signal of the angular displacement sensor:
Ui＝f(η，A)
η is the amplitude ratio of the compensation signal and the excitation signal, Ub is the amplitude of the compensation signal, Ub/Ui is a fixed value under the normal temperature condition, and A is an adjustable coefficient.
Preferably, in step 1, after the amplitude of the excitation signal is obtained by calculation, the excitation signal is output by a DA circuit, and an output end of the DA circuit is designed with a push-pull circuit.
Preferably, the push-pull circuit comprises triodes V1 and V2, bases of V1 and V2 are connected with an output end of the DA circuit in common, and emitters of V1 and V2 are connected with the angular displacement sensor in common.
Preferably, in step 2, after the output signal of the angular displacement sensor and the compensation signal pass through a follower built by an operational amplifier, the signals are collected through an AD circuit, and the signal amplitudes are respectively:
Uo＝BαUi
Ub＝ηUi
wherein, Uo is the amplitude of the output signal, α is the angle value of the angular displacement sensor, which is in direct proportion to the fuel flow, B is a constant, which is determined by the self-characteristic of the angular displacement sensor;
and sending the acquired output signal amplitude and the acquired compensation signal amplitude to a control operation circuit for further calculation.
Preferably, the follower comprises operational amplifiers N1 and N2, an input terminal of N1 and an input terminal subsection of N2 are connected to different positions of the angular displacement sensor, and an output terminal of N1 and an output terminal subsection of N2 are connected to the input terminals of the AD circuit.
Preferably, in step 3, the amplitude of the output signal is calculated to obtain the fuel flow of the engine:
U5T＝g(Uo，E)
wherein U is5TThe fuel flow is a remote measurement value, and the fuel flow is represented; e is an adjustable coefficient; adjusting A in step 1 and E in step 3 to a certain value to enable the fuel flow of the engine and U5TThe corresponding relation curve is calibrated to be a qualified curve and then is determined according to U5TThe value is directly converted into the engine fuel flow.
(III) advantageous effects
Compared with the prior art, the invention has the following advantages and positive effects:
1. the scheme greatly reduces resistance and capacitance elements, almost avoids temperature drift and other problems, improves signal stability and optimizes system control performance.
2. The existing scheme adopts an analog switch to carry out alternating current-to-direct current conversion on the output and compensation signals of the sensor, the error is large, the circuit design is complex, an AD acquisition mode is adopted in the scheme, the precision is high, and the circuit is simple.
3. The product can be debugged by modifying the software code, so that complicated resistance and potentiometer adjustment are eliminated, the production debugging process is greatly optimized, and the production efficiency of the product is improved.
4. The type and the number of components are reduced, the digital circuit part is a central processing unit originally used by a controller, and the components which are especially higher in cost and failure rate such as a potentiometer and the like are not required to be newly added, so that the whole manufacturing cost is reduced, and the product reliability is improved.
Drawings
FIG. 1 is a schematic diagram of an engine controller architecture;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a circuit diagram of the present invention;
fig. 4 is a waveform diagram of an angular displacement sensor signal according to the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The invention relates to a design method of a signal conditioning circuit of a digital angular displacement sensor, which is mainly applied to an engine control device, the structure of the device is shown in figure 1, and the part related to the signal conditioning function of the angular displacement sensor mainly comprises a digital control arithmetic circuit, an excitation output circuit and an output and compensation signal acquisition circuit. The digital control arithmetic circuit is responsible for normal calculation of the system, and is additionally provided with a part of software program to complete generation of the excitation waveform of the angular displacement sensor shown in FIG. 4, the frequency is generally 400Hz, the amplitude of the square wave can be adjusted, the square wave is output by the DA circuit and is added to the primary level of the coil of the angular displacement sensor after power amplification, the secondary level of the angular displacement sensor outputs the same-direction same-frequency square wave signal, the amplitude of the square wave represents the fuel flow, the compensation coil outputs the reverse same-frequency compensation signal for compensating the excitation signal, the output and the compensation signal of the angular displacement sensor are acquired by the AD circuit and then are sent to the digital control arithmetic circuit, and the. Specifically, as shown in fig. 2, the design method of the embodiment of the present invention includes the following steps:
step 1, generating an excitation signal of the angular displacement sensor by a digital control operation circuit.
As shown in fig. 3, in this embodiment, the digital control arithmetic circuit is formed by TMS320C32+ isp L SI1048C, and calculates the amplitude of the excitation signal of the angular displacement sensor:
the amplitude ratio η of the compensation signal and the excitation signal of the angular displacement sensor designed by the invention is 0.021 under the normal temperature condition, so that under the normal temperature condition:
the adjustable range of the coefficient A is 0-2.2. After the amplitude is obtained through calculation, the amplitude is output by a DA circuit, the frequency is 400Hz, a push-pull circuit is formed by adopting MAX7545, V1 and V2 for a DA chip, the models are respectively 3DG111B and 3CG110C, and the driving capacity of the circuit is increased to 50 mA.
And 2, acquiring output and compensation signals of the angular displacement sensor based on the excitation signals of the angular displacement sensor.
The output of the angular displacement sensor and the compensation signal are collected through an AD circuit after passing through a follower built by an operational amplifier. By fortune N1, N2 constitution follower, the model is OP27, and angular displacement sensor output and compensation signal pass through the follower after, gather through the AD circuit, and AD chip adopts AD7874, and signal amplitude is respectively:
Uo＝BαUi
Ub＝ηUi
α, the angle of the angular displacement sensor is in direct proportion to the fuel flow, the angular displacement sensor designed by the invention has an angle range of 0-40 degrees and corresponds to the fuel flow of 0-500L/h;
b: the constant is determined by the angular displacement sensor, and the constant of the angular displacement sensor designed by the invention is 0.0125;
and sending the acquired signal amplitude to a digital control operation circuit for further calculation.
And 3, calculating the output signal by the digital control operation circuit to obtain the fuel flow of the engine:
U5T＝2.26*Uo+E
the coefficient E can be adjusted within a range of-0.18V-0.20V, and due to the discreteness of the system, the A in the step 1 and the E in the step 3 need to be adjusted to proper positions, so that the fuel flow rate is enabled to beAnd U5TIs calibrated as a qualified curve and then can be determined according to U5TThe value is converted into the fuel flow of the engine to participate in the calculation of the subsequent control law.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (1)
1. A design method of a signal conditioning circuit of a digital angular displacement sensor is characterized by comprising the following steps:
step 1, generating an excitation signal of an angular displacement sensor by a digital control operation circuit;
step 2, acquiring output and compensation signals of the angular displacement sensor based on an excitation signal of the angular displacement sensor;
step 3, calculating a fuel flow value by a digital control operation circuit;
in the step 1, a digital control operation circuit is designed to calculate the amplitude Ui of an excitation signal of the angular displacement sensor:
Ui＝f(η，A)
η is the amplitude ratio of the compensation signal and the excitation signal, Ub is the amplitude of the compensation signal, Ub/Ui is a fixed value under the normal temperature condition, A is an adjustable coefficient;
in the step 1, after the amplitude of the excitation signal is obtained through calculation, the excitation signal is output by a DA circuit, and a push-pull circuit is designed at the output end of the DA circuit;
the push-pull circuit comprises triodes V1 and V2, bases of V1 and V2 are connected with an output end of the DA circuit, and emitters of V1 and V2 are connected with the angular displacement sensor;
in step 2, after an output signal and a compensation signal of the angular displacement sensor pass through a follower built by an operational amplifier, the signals are collected through an AD circuit, and the signal amplitudes are respectively as follows:
Uo＝BαUi
Ub＝ηUi
wherein, Uo is the amplitude of the output signal, α is the angle value of the angular displacement sensor, which is in direct proportion to the fuel flow, B is a constant, which is determined by the self-characteristic of the angular displacement sensor;
sending the acquired output signal amplitude and the acquired compensation signal amplitude to a control operation circuit for next calculation;
the follower comprises operational amplifiers N1 and N2, an input end of N1 and an input end subsection of N2 are connected with different positions of the angular displacement sensor, and an output end of N1 and an output end subsection of N2 are connected with the input end of the AD circuit;
in step 3, calculating the amplitude of the output signal to obtain the fuel flow of the engine:
U5T＝g(Uo，E)
wherein U is5TThe fuel flow is a remote measurement value, and the fuel flow is represented; e is an adjustable coefficient; adjusting A in step 1 and E in step 3 to a certain value to enable the fuel flow of the engine and U5TThe corresponding relation curve is calibrated to be a qualified curve and then is determined according to U5TThe value is directly converted into the engine fuel flow.
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| CN108020282A (en) * | 2017-12-07 | 2018-05-11 | 合肥工业大学 | Coriolis mass flowmeter signal processing method based on complex coefficient filtering |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2065779B (en) * | 1979-12-21 | 1983-09-21 | Rolls Royce | Gas turbine fuel system |
| CN101187816A (en) * | 2007-11-28 | 2008-05-28 | 华中科技大学 | Precision temperature controller |
| CN203519116U (en) * | 2013-09-18 | 2014-04-02 | 湖北汽车工业学院 | Oil quantity sensor measuring and controlling system based on DSP |
| CN103699114A (en) * | 2013-12-13 | 2014-04-02 | 中国燃气涡轮研究院 | Controller and control method for debugging tests of aviation fuel regulating device |
| CN108111168B (en) * | 2017-11-23 | 2021-04-20 | 中国航空工业集团公司西安航空计算技术研究所 | Improved engine fuel flow sensor signal acquisition circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07239204A (en) * | 1994-02-25 | 1995-09-12 | Nippon Soken Inc | Rotational angle detection device |
| CN201876237U (en) * | 2010-10-14 | 2011-06-22 | 上海新跃仪表厂 | Angular position sensor of throttle valve |
| CN103593501A (en) * | 2013-10-11 | 2014-02-19 | 中国航空工业集团公司沈阳发动机设计研究所 | Design method of aeroengine lubricating oil system |
| CN203550970U (en) * | 2013-10-29 | 2014-04-16 | 重庆长安伟世通发动机控制系统有限公司 | Thin noncontact-type electronic throttle sensor |
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