CN108226776A - A kind of small-sized piston formula engine magnetic electric motor signal acquisition circuit - Google Patents
A kind of small-sized piston formula engine magnetic electric motor signal acquisition circuit Download PDFInfo
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- CN108226776A CN108226776A CN201611155374.6A CN201611155374A CN108226776A CN 108226776 A CN108226776 A CN 108226776A CN 201611155374 A CN201611155374 A CN 201611155374A CN 108226776 A CN108226776 A CN 108226776A
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- 238000000034 method Methods 0.000 claims abstract description 7
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- 239000003990 capacitor Substances 0.000 claims description 9
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 claims description 6
- 230000002238 attenuated effect Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000630 rising 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
- G01R31/34—Testing dynamo-electric machines
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
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Abstract
The invention belongs to aircraft engine parameter collection fields.To solve the problems, such as that aviation piston type engine magneto signal amplitude is high, interfering the acquisition precision brought greatly poor, propose a kind of small-sized piston engine magneto signal acquisition circuit, to magneto signal successively into horizontal high voltage attenuation, full-wave rectification, voltage clamp and digital filtering process, magneto signal amplitude and filtering interference signals can be effectively reduced, solve the problems, such as magneto signal acquisition.
Description
Technical Field
The invention belongs to the field of aircraft engine parameter acquisition, and particularly relates to a magneto signal acquisition circuit of a small piston engine.
Background
Ignition systems of aviation piston engines are classified into level ignition systems and magneto ignition systems. The magneto ignition system is widely used at present. The magnetor is composed of magnetic circuit, low-voltage circuit, high-voltage circuit and starting circuit, and is characterized by that the starting oscillator can be used for producing alternating voltage current, when the delay breaker is cut off, the left magnetic secondary coil/right magnetic secondary coil can be used for inducing and producing high-voltage induction potential, and said high-voltage induction potential can be fed into the cylinder electric nozzle to make ignition.
The ignition frequency of the magneto is in direct proportion to the rotating speed, so that the rotating speed parameter of the engine of the small airplane can be calculated by acquiring the signal frequency of the magneto. The magneto signal has the characteristics of high amplitude, large interference and the like and the alternating current characteristic, and brings certain difficulty to acquisition. The invention provides a magneto signal acquisition circuit of a small piston engine, which effectively solves the problem of magneto signal acquisition by methods such as high-voltage attenuation, full-wave rectification, voltage clamping, digital filtering and the like.
Disclosure of Invention
The purpose of the invention is as follows: the magneto signal acquisition device aims at solving the problem that magneto signals of a piston engine are difficult to acquire.
The technical scheme is as follows: a small piston engine magneto signal acquisition circuit comprises a high voltage attenuation circuit, a full wave rectification circuit, a voltage clamping circuit and a digital filter circuit; after the signal enters a high-voltage attenuation circuit, the magneto signal is attenuated to be below 10V, the attenuated signal is subjected to full-wave rectification and then enters a voltage clamping circuit, and finally the signal becomes a voltage signal which can be collected through a digital filter circuit; wherein,
the high-voltage attenuation circuit comprises an external attenuation part and an internal attenuation part, wherein the external attenuation part uses an adjustable resistor, the resistance value of the internal attenuation resistor is fixed, and the external attenuation resistor is connected with the internal attenuation resistor in series.
The full-wave rectifying circuit comprises 4 rectifying diodes which are connected in series and then connected in parallel, wherein the GND1 and GND2 used by the diodes need to be isolated.
The digital filter circuit is realized by programmable logic, and the functions of the digital filter circuit comprise metastable state removal and interference signal filtering near a valid signal.
The voltage clamping circuit comprises a current limiting diode and a voltage amplifying part.
The current limiting part comprises resistors R3, R4 and R6, a diode V5 and capacitors C1 and C2. The diode V5, the resistor R6, the diode V6 and the resistor R4 are sequentially connected in series, wherein the positive end of the diode V5 is connected with an output signal of the full-wave rectification circuit, the other end of the resistor R4 is connected with the GND1, one end of the resistor R3 and the positive end of the capacitor C1 are respectively connected with the positive end and the negative end of the diode V5, the other end of the resistor R3 and the negative end of the capacitor C1 are connected with the GND1, and the capacitor C2 is connected in parallel with the two ends of.
The voltage amplifying part includes an operational amplifier N, resistors R5, R7, R8 and R9. Two ends of a resistor R5 are respectively connected with the negative end of a diode V6 and the negative input end of an operational amplifier N, two ends of a resistor R7 are respectively connected with the positive end of a diode V6 and the positive input end of the operational amplifier N, two ends of a resistor R8 are respectively connected with the negative input end of the operational amplifier and the output end of the operational amplifier, and two ends of a resistor R9 are respectively connected with the positive input end of the operational amplifier and GND 1.
The invention also provides a small piston engine magneto signal acquisition method, wherein the signal sequentially passes through a high-voltage attenuation circuit, a full-wave rectification circuit, a voltage clamping circuit and a digital filter circuit, and the method comprises the following specific steps:
step one; the high-voltage attenuation circuit: as shown in FIG. 1, two-stage attenuation of the inner attenuation resistor and the outer attenuation resistor is adopted, the values of the inner attenuation resistor R1 and the inner attenuation resistor R2 are fixed, and the value of the outer attenuation resistor RW is adjustable. Adjusting the value of an external attenuation resistor RW according to the highest voltage values of magneto signals of different models, so that the voltage signal R _ signal value after attenuation by the external resistor RW is kept within an acceptable range of an internal acquisition circuit;
step two; a full-wave rectification circuit: as shown in fig. 1, the power ground used by the full-wave rectification circuit is AGND, which corresponds to the power source isolated from the power source corresponding to the magneto signal GND;
step three; a voltage clamp circuit: as shown in fig. 1, the voltage clamp circuit is divided into two parts of current limiting and amplifying, after full-wave rectification, the signal is filtered and clamped by a diode, the voltage amplitude is clamped to the voltage drop at two ends when the diode PN junction is conducted, and for subsequent signal processing, the signal is amplified to the amplitude of TTL level by a primary amplifying circuit;
step four; a digital filter circuit: in order to prevent the interference of the front-stage signal to the rear-stage circuit, the voltage enters the programmable logic chip after being isolated by the photoelectric coupler after being clamped. In the programmable logic chip, in order to prevent the metastable state, the signal is synchronized by the two-stage trigger and then enters the digital filter circuit to filter the interference signal of the magnetor at a specific time nearby the effective signal.
The invention has the technical effects that: the problems of high amplitude, large interference and the like of magneto signals and difficulty in alternating current characteristic acquisition are solved, and errors between the calculated rotating speed of the acquired magneto signals and the actual rotating speed are small, and the accuracy is high; the method directly acquires the signal of the engine without additionally arranging a rotating speed sensor, thereby reducing the design complexity and the cost.
Drawings
Fig. 1 is a circuit diagram of a magneto signal acquisition circuit.
Detailed Description
The specific embodiment is as follows:
(1) a high voltage attenuation circuit; the external attenuation resistor is 74k omega resistance, the internal attenuation resistors R1 and R2 are 3k omega resistance and 8k omega resistance respectively, and the maximum voltage value after attenuation is about +/-8V;
(2) a full-wave rectification circuit: selecting a BAS32 diode, and after full-wave rectification, inverting the voltage below 0V into positive voltage, namely, the voltage value of the output signal after full-wave rectification is between 0 and 8V;
(3) a voltage clamp circuit: c1 and C2 adopt 1nF magnetic medium capacitors, R3, R4 and R6 adopt 1k omega resistance resistors, R5 and R7 adopt 10k omega resistance resistors, diodes V5 and V6 adopt BAS32, operational amplifiers adopt AD8606, and after passing through a voltage clamping circuit, the voltage value of an output signal is about 3.3V;
(4) a digital filter circuit: the digital filter circuit selects a CPLD chip XC95288, after the output signal of the voltage clamping circuit enters the chip, the output signal is synchronized by two stages of triggers, then a counter is adopted to filter the interference signal within 5ns time near the first rising edge, and the signal of the digital filter circuit acquires and calculates frequency by using partial functions of the DSP chip TMS320C2812 EVA;
the error between the rotating speed calculated by the magneto signal acquired by the method and the actual rotating speed is less than 10r/m through actual measurement on a certain type of piston engine, and the effect is good.
Claims (4)
1. The utility model provides a small-size piston engine magneto signal acquisition circuit which characterized in that: the high-voltage attenuation circuit comprises a high-voltage attenuation circuit, a full-wave rectification circuit, a voltage clamping circuit and a digital filter circuit; the magneto signal enters a high-voltage attenuation circuit for amplitude attenuation, the attenuated signal is subjected to full-wave rectification and then enters a voltage clamping circuit, and finally the attenuated signal passes through a digital filter circuit and then is input into a digital signal processor for collection;
the high-voltage attenuation circuit comprises an external attenuation part and an internal attenuation part, wherein the external attenuation part uses an adjustable resistor, the resistance value of the internal attenuation resistor is fixed, and the external attenuation resistor is connected with the internal attenuation resistor in series;
the full-wave rectifying circuit comprises 4 diodes for rectification, the diodes are connected in series and then connected in parallel, and the grounds of GND1 and GND2 used by the diodes need to be isolated;
the voltage clamping circuit comprises a current limiting part and a voltage amplifying part;
the digital filter circuit is realized by programmable logic, and the functions of the digital filter circuit comprise metastable state removal and interference signal filtering near effective signals.
2. A small piston engine magneto signal acquisition circuit as claimed in claim 1 wherein said current limiting portion comprises resistors R3, R4, R6, diode V5, capacitors C1, C2; the diode V5, the resistor R6, the diode V6 and the resistor R4 are sequentially connected in series, wherein the positive end of the diode V5 is connected with an output signal of the full-wave rectification circuit, the other end of the resistor R4 is connected with the GND1, one end of the resistor R3 and the positive end of the capacitor C1 are respectively connected with the positive end and the negative end of the diode V5, the other end of the resistor R3 and the negative end of the capacitor C1 are connected with the GND1, and the capacitor C2 is connected in parallel with the two ends of.
3. The magneto signal acquisition circuit of a small piston engine according to claim 1, wherein the voltage amplification section comprises operational amplifier N, resistors R5, R7, R8 and R9; two ends of a resistor R5 are respectively connected with the negative end of a diode V6 and the negative input end of an operational amplifier N, two ends of a resistor R7 are respectively connected with the positive end of a diode V6 and the positive input end of the operational amplifier N, two ends of a resistor R8 are respectively connected with the negative input end of the operational amplifier and the output end of the operational amplifier, and two ends of a resistor R9 are respectively connected with the positive input end of the operational amplifier and GND 1.
4. A small piston engine magneto signal acquisition method, the signal loops through high-voltage attenuation circuit, full wave rectifier circuit, voltage clamp circuit, digital filter circuit, the concrete step is as follows:
step one; the high-voltage attenuation circuit: the internal attenuation and the external attenuation are adopted, the values of the internal attenuation resistors R1 and R2 are fixed, and the value of the external attenuation resistor RW is adjustable; adjusting the value of an external attenuation resistor RW according to the highest voltage values of magneto signals of different models, so that the voltage signal R _ signal value after attenuation by the external resistor RW is kept within an acceptable range of an internal acquisition circuit;
step two; a full-wave rectification circuit: the power ground used by the full-wave rectification circuit is AGND, and the power corresponding to the AGND is isolated from the power corresponding to the magnetor signal GND;
step three; a voltage clamp circuit: the voltage clamping circuit is divided into a current limiting part and an amplifying part, after full-wave rectification, signals are filtered and clamped by a diode, the voltage amplitude is clamped to the voltage drop at two ends when a PN junction of the diode is conducted, for subsequent signal processing, the signals are amplified to the amplitude of a TTL level by a primary amplifying circuit;
step four; a digital filter circuit: in order to prevent the interference of the preceding stage signal to the subsequent stage circuit, the voltage enters the programmable logic chip after being isolated by the photoelectric coupler after being clamped; in the programmable logic chip, in order to prevent the metastable state, the signal is synchronized by the two-stage trigger and then enters the digital filter circuit to filter the interference signal of the magnetor at a specific time nearby the effective signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611155374.6A CN108226776B (en) | 2016-12-14 | 2016-12-14 | Small piston engine magneto signal acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611155374.6A CN108226776B (en) | 2016-12-14 | 2016-12-14 | Small piston engine magneto signal acquisition circuit |
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| CN108226776A true CN108226776A (en) | 2018-06-29 |
| CN108226776B CN108226776B (en) | 2021-07-16 |
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| CN102468795A (en) * | 2010-11-10 | 2012-05-23 | 南京南瑞继保电气有限公司 | Method for detecting static position of synchronous motor rotor |
| CN102621345A (en) * | 2012-04-10 | 2012-08-01 | 西北工业大学 | Detection method and device of rotation speed of generator |
| CN202374213U (en) * | 2011-08-23 | 2012-08-08 | 山东美邦电子科技有限公司 | Improved permanent magnet motor controller of electric walking-assistant vehicle |
| CN104330583A (en) * | 2014-10-28 | 2015-02-04 | 陕西千山航空电子有限责任公司 | Aircraft engine rotating speed signal acquisition circuit |
| CN105841867A (en) * | 2016-05-20 | 2016-08-10 | 广东工业大学 | Measuring method for tooth groove torque of permanent magnet motor |
-
2016
- 2016-12-14 CN CN201611155374.6A patent/CN108226776B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06350450A (en) * | 1993-06-10 | 1994-12-22 | Nippondenso Co Ltd | Data collection device with a/d converter |
| CN2438836Y (en) * | 2000-08-21 | 2001-07-11 | 王希桓 | Fuel-feeding & ignition controller of engine for motorcycle |
| CN2586821Y (en) * | 2002-11-15 | 2003-11-19 | 陈万兴 | Motorcycle throttle electric starting controller |
| CN1748924A (en) * | 2005-01-08 | 2006-03-22 | 湘潭大学 | Automatic tracking control method for submerged-arc welding seam |
| CN201075665Y (en) * | 2007-07-13 | 2008-06-18 | 合肥英特电力设备有限公司 | Protection test control apparatus having functions of alternating-current/direct-current general use and checking the same term |
| CN102468795A (en) * | 2010-11-10 | 2012-05-23 | 南京南瑞继保电气有限公司 | Method for detecting static position of synchronous motor rotor |
| CN202374213U (en) * | 2011-08-23 | 2012-08-08 | 山东美邦电子科技有限公司 | Improved permanent magnet motor controller of electric walking-assistant vehicle |
| CN102621345A (en) * | 2012-04-10 | 2012-08-01 | 西北工业大学 | Detection method and device of rotation speed of generator |
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| CN105841867A (en) * | 2016-05-20 | 2016-08-10 | 广东工业大学 | Measuring method for tooth groove torque of permanent magnet motor |
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Inventor after: Jing Desheng Inventor after: Gou Limin Inventor after: Gao Hao Inventor after: Jiang Xiegang Inventor after: Han Liang Inventor after: Kuang Wen Cong Inventor before: Jing Desheng Inventor before: Gou Limin Inventor before: Gao Hao Inventor before: Jiang Xiegang Inventor before: Han Liang Inventor before: Kuang Wen Cong |
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