CN112697438A - Turboprop engine pitch-phase angle-rotating speed measuring device and method based on tone wheel - Google Patents
Turboprop engine pitch-phase angle-rotating speed measuring device and method based on tone wheel Download PDFInfo
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- G01M15/00—Testing of engines
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to a device and a method for measuring a propeller pitch-phase angle-rotating speed of a turboprop based on a sound wheel, belonging to the field of control of aviation turboprops. The measuring device disclosed by the invention comprises: the device comprises a tone wheel (6), a magnetic induction probe (7) and a signal processing module (9). The tone wheel (6) is coupled to a propeller. The magnetic induction probe (7) is capable of generating a signal in response to the passage of a plurality of regular teeth (1), first marker teeth (2) and second marker teeth (3) on the tone wheel (6). The signal processing module (9) is able to determine the pitch, phase angle and rotational speed of the propeller, respectively, based on a specific delay, a specific time and an expected delay of the signal pulse. The herringbone marking teeth with the same mass as the conventional teeth (1) are adopted, so that the propeller pitch can be measured and can also be used as reference positions of phase angles, and the two symmetrical teeth have the effects of complementary correction of magnetoelectric detection signals and reduction of unbalance, so that the influence of random phase angle reference positions and vibration noise on measurement is overcome, and the measurement precision, the sensitivity and the working stability are improved.
Description
Technical Field
The invention relates to a device and a method for measuring a propeller pitch-phase angle-rotating speed of a turboprop based on a sound wheel, belonging to the field of control of aviation turboprops.
Background
The development of the aircraft engine control system is towards the direction from single variable control to multi-variable control, and how to increase the number of the parameters measured by the sensors without increasing the number of the sensors so as to increase the safety of the aircraft control system and reduce the weight of the aircraft puts high requirements on the multi-parameter measurement of the single sensor. In modern turboprop aircraft, a multivariable control system is mostly adopted, and the propeller pitch, the phase angle and the rotating speed of a propeller need to be measured in real time to enable the aircraft to fly stably.
At present, in the domestic field, the pitch, phase angle and rotating speed of turboprop engines are mostly separated and independent sensors, for example, a patent with publication number CN105486220A discloses a pitch measuring device, which adopts an eddy current sensor for detecting the displacement change of a tested body corresponding to the change of the rotating pitch angle of blades, converting the displacement change into an electric signal and outputting the electric signal to an engine control box, and finally processing the signal to calculate the pitch; the patent with publication number CN105486220A discloses a method for measuring the rotation speed by a tachometer motor, that is, collecting the ac voltage signal of the tachometer motor of the tachometer sensor, the frequency of which is in direct proportion to the rotation speed of the engine, and measuring the frequency or period of the ac signal to obtain the rotation speed of the rotor, but not to measure the other two parameters; for another example, among the rotation speed sensors generally used in the aircraft engine, the magnetoelectric rotation speed sensor with the tone wheel has the characteristics of simple structure and high precision, and is most widely applied, but currently, the measurement of the rotation speed is only realized, the measurement of the propeller phase angle of the turboprop engine is still in the test stage, and a method for marking the phase angle reference position by embedding a high-magnetic material on the tone wheel is provided in China, so that the measurement of double parameters can be realized, but the problem of rotor unbalance exists, and balance weight needs to be carried out.
In summary, these methods using multi-parameter and multi-sensor measurement may increase mutual interference between sensor hardware and connection lines, which is very undesirable in the field of aviation where the requirements on aircraft weight and safety are very strict. Therefore, a measuring device which is high in precision and can simultaneously measure three parameters of the pitch, the phase angle and the rotating speed and has no mutual interference of multiple sensors is urgently needed.
Disclosure of Invention
The invention aims to provide a device and a method for measuring a propeller pitch-phase angle-rotating speed of a turboprop based on a tone wheel, aiming at realizing high-precision and sensitivity measurement of the propeller pitch, the phase angle and the rotating speed only by using a magnetoelectric sensor with the tone wheel, and the tone wheel structure has good static and dynamic balance characteristics.
In order to achieve the purpose, the invention provides the following technical scheme:
a propeller pitch-phase angle-rotating speed measuring device using a tone wheel comprises the tone wheel, a magnetic induction probe and a signal processing module. The tone wheel includes a plurality of regular teeth disposed on an outer circumferential surface of the tone wheel and uniformly circumferentially spaced apart, and first and second flag teeth disposed on the outer surface, the first and second flag teeth being respectively closer to adjacent ones of the regular teeth in a circumferential position and representing a reference position of a phase angle of the propeller, apex positions of the first and second flag teeth being represented as reference positions of a pitch of the propeller, the tone wheel being configured to rotate or move axially with the propeller during operation of the propeller engine;
the magnetic induction probe is fixed on a stationary part of the engine, is adjacent to the tone wheel and is configured to respond to the passing of the conventional teeth and the marking teeth to generate a signal, and the signal comprises a plurality of signal pulses, wherein the occurrence timing of the plurality of signal pulses corresponds to the passing timing of the plurality of conventional teeth, the first marking teeth and the second marking teeth during the rotation of the tone wheel;
the signal processing module coupled to the magnetic induction probe for obtaining the signal and configured for:
determining an expected delay between two consecutive signal pulses of the plurality of the signals based on the plurality of signal pulses, the expected delay representing a time interval of the plurality of regular teeth;
identifying a first particular pulse associated with the first marker tooth from within the plurality of signal pulses, the particular pulse having a delay shorter than the expected delay;
determining, based on a first particular pulse, a particular delay of a second particular pulse associated with the second marking tooth that occurs consecutively therewith, the particular delay representing a time interval of the first and second particular pulses;
determining a circumferential distance of said first and second marked teeth for an axial position of the propeller based on the specific delays of said first and second specific pulses associated with said first and second marked teeth, typically taking the apex position of the first and second marked teeth as 0 pitch, so that said circumferential distance can be used to calculate the pitch of the propeller from the angular relationship of the first and second marked teeth;
determining the phase angle of the propeller at the current data acquisition moment relative to the vertex angle boundary line position of the first marking tooth and the second marking tooth based on the time average value of the first specific time and the second specific time generated by the first specific pulse and the second specific pulse, and eliminating the error of random reference position and vibration noise caused by using only one marking helical tooth on the phase angle measurement precision;
and calculating the propeller rotation speed based on the expected delay.
The integral structure of the tone wheel is characterized by comprising teeth, a cylinder and a through hole. The tone wheel tooth structure is characterized in that the thickness of the tone wheel is more than or equal to the variation range of the pitch, so that a cylindrical tone wheel structure with a certain thickness is adopted to reduce the weight of the tone wheel; the plurality of conventional teeth are arranged in parallel in the circumferential direction and are all parallel to the axis of the tone wheel; the volume and the mass of the first mark tooth and the second mark tooth are respectively set to be half of any one of the rest conventional teeth, the first mark tooth and the second mark tooth form the same angle of a degrees with parallel lines of the conventional teeth which are circumferentially arranged, the two symmetrical teeth form complementary differential double-gain sensitivity, and the magnetic-electric detection signal complementary correction and unbalance reduction effects are achieved, so that the measurement accuracy, the sensitivity and the rotor static-dynamic balance characteristic are improved; the cylindrical structure is used for reducing the weight of the tone wheel; the through hole is sleeved on a rotating shaft of the propeller and rotates and axially moves together with the propeller.
The signal processing module, characterized by comprising: the signal conditioning circuit, the F/D conversion circuit and the embedded on-chip programmable system. The signal conditioning circuit is used for connecting the magnetic induction probe and is provided with a first connecting end and a second connecting end, the first connecting end is directly connected with the embedded on-chip programmable system, and the second connecting end is connected with the F/D conversion circuit firstly and then is connected with the embedded on-chip programmable system.
The measurement method of the propeller pitch-phase angle-rotating speed measurement device using the sound wheel is characterized by comprising the following steps of:
the tone wheel and the propeller are coupled together to operate with the engine, and the magnetic induction probe generates an associated pulse signal in response to passage of a plurality of circumferentially evenly spaced conventional teeth, first marker teeth and second marker teeth on an outer circumferential surface of the tone wheel and transmits the pulse signal to the signal processing module. The signal processing module carries out the processes of denoising, amplifying and shaping, amplitude limiting and negative voltage filtering on the plurality of pulse signals acquired from the magnetic induction probe, thereby obtaining a positive square wave signal. The square wave signal is directly transmitted to an embedded on-chip programmable system through a first connecting end of the signal conditioning circuit, the embedded on-chip programmable system can read rising edge time or falling edge time from the square wave signal by using codes with specific functions written by software to perform data processing and storage, read out the specific delay, the mean value of the first specific time and the second specific time and expected delay, and further calculate the pitch, the phase angle and the rotating speed at the current moment; the square wave signal can also be transmitted to the F/D conversion circuit through the second connecting end of the signal conditioning circuit, the frequency quantity of the square wave signal is converted into the digital quantity of the rotating speed in the F/D conversion circuit, and finally the digital quantity is transmitted to the embedded on-chip programmable system. The rotating speed, the propeller pitch and the phase angle are sent out through a bus interface.
The code of the specific function enables the algorithm to have good robustness by setting the threshold value e related to the size of the mark tooth, and considers that the data acquisition moment is not necessarily the moment of generating a specific pulse, so that the specific delay of the latest moment, the mean value of the first specific time and the second specific time and the expected delay need to be stored in real time, and the code has the following logic steps:
step 1: setting a threshold e capable of identifying a first specific pulse, a conventional tooth number Z and a tooth top radius R at first;
step 2: obtaining rising edge time T of three continuous square wave signals1、T2、T3；
And step 3: perform logical operation | (T)2-T1)-(T3-T2) If true, | < e, store the expected delay TA＝T3-T2. If false, returning to the step 2;
and 4, step 4: obtaining rising edge time T of three continuous square wave signals1、T2、T3；
And 5: perform a logical operation | TA-(T2-T1) If | e, the storage specific delay TC＝T2-T1Time mean value T of first specific time and second specific timeS＝(T2+T3)/2. If false, returning to the step 4;
step 6: whether to execute the data acquisition instruction, if true, obtaining the time T of the current instruction execution timeNAnd calculated as follows, pitch ═ pi · R · TC/{(Z+1)·TATan (a °), phase angle 360 · (T)N-TS)/{(Z+1)·TA) 60/{ (Z +1) · T at a rotation speed nAAnd finally ending. If false, return to step 2.
Compared with the prior art, the invention has the advantages that: the fact that the pulse signals of the conventional teeth which are evenly spaced in the circumferential direction and the pulse signals of the first mark tooth and the second mark tooth which are arranged on the outer surface can be identified from the pulse signals responded by the magnetic induction probe by using the magneto-electric sensor with the voice wheel only is achieved, so that the specific delay, the time mean value and the expected delay of the first specific time and the second specific time are determined through the signal processing module, and finally the measurement of the three parameters of the pitch, the phase angle and the rotating speed is achieved. The cylindrical tone wheel structure with herringbone marking teeth and approximately uniformly distributed mass has good light-weight rotor static and dynamic balance characteristics, and the problem of rotor static and dynamic balance counterweight of the tone wheel due to the special structure of the marking teeth and special high-magnetic materials is solved, so that the manufacturing process is simplified, and the cost is reduced; the first and second symmetrical marking teeth form complementary differential double-gain sensitivity, have the effect of complementary correction of magnetoelectric detection signals, overcome the influence of random phase angle reference positions of single-marking helical teeth and vibration noise on measurement precision, and improve the measurement precision, the sensitivity and the working stability. Therefore, the device not only ensures the measurement precision, but also reduces the difficulty of processing and manufacturing while measuring three parameters of the pitch, the phase angle and the rotating speed.
Drawings
Fig. 1 is a perspective view and a left side view of the structure of the present invention.
Fig. 2 is a block diagram of a signal processing module according to the present invention.
Fig. 3 is a corresponding diagram of the pulse signal and the circumferential tooth profile development of the propeller at a certain axial position.
FIG. 4 is a schematic diagram of the present invention for conditioning a pulse signal into a square wave signal.
FIG. 5 is a logic flow diagram of specific function code of the present invention.
In the figure: 1-conventional teeth, 2-first mark teeth, 3-second mark teeth, 4-cylinder, 5-through hole, 6-tone wheel, 7-magnetic induction probe, 8-wire, 9-signal processing module and 10-bus interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a propeller pitch-phase angle-rotation speed measuring apparatus using a tone wheel includes a tone wheel 6, a magnetic induction probe 7, and a signal processing module 9. The tone wheel includes a plurality of regular teeth 1 uniformly spaced in a circumferential direction provided on an outer circumferential surface of the tone wheel and first and second flag teeth 2 and 3 provided on the outer surface, the first and second flag teeth 2 and 3 being located closer to adjacent ones of the regular teeth 1 in a circumferential direction, respectively, and a reference position of a phase angle of the propeller is represented by the first flag tooth 2, a position of a vertex angle of the first and second flag teeth 2 and 3 is represented by a pitch reference position of the propeller, the tone wheel 6 being configured to rotate in an "E" direction and move axially in an "F" direction together with the propeller during operation of the propeller engine;
the integral structure of the tone wheel is characterized by comprising teeth, a cylinder 4 and a through hole 5. The tone wheel tooth structure is characterized in that the thickness of the tone wheel is more than or equal to the variation range of the pitch, so that a cylindrical tone wheel structure with a certain thickness is adopted to reduce the weight of the tone wheel; the plurality of conventional teeth 1 are arranged in parallel in the circumferential direction, are parallel to the axis of the tone wheel 6 and are also parallel to the line D; the volume and the mass of the first marking tooth 2 and the second marking tooth 3 are respectively set to be half of that of any one of the other conventional teeth 1, the first marking tooth 2 and the second marking tooth 3 form the same angle of a degrees with a line D, the two symmetrical teeth form complementary differential double-gain sensitivity, and the two symmetrical teeth have the effects of complementary correction of magnetoelectric detection signals and reduction of unbalance, so that the measurement accuracy, the sensitivity and the static and dynamic balance characteristics of a rotor are improved; the cylindrical structure is used for reducing the weight of the tone wheel; the through hole is sleeved on a rotating shaft of the propeller and rotates along the direction of 'E' and moves along the direction of 'F' along the axial direction together with the propeller.
Referring to fig. 3, the magnetic induction probe 7, fixed to a stationary part of the engine, is adjacent to the tone wheel 6 and is configured to generate a signal in response to the passage of the regular teeth 1 and the marker teeth, the signal including a plurality of signal pulses whose occurrence timings correspond to the passage timings of the plurality of regular teeth 1, first marker teeth 2, and second marker teeth 3 during the rotation of the tone wheel 6. When the propeller drives the tone wheel to rotate, the tooth peaks and the tooth valleys of the tone wheel cause the change of the gap delta between the tone wheel and the permanent magnet, so that the magnetic flux in the magnetic circuit formed by the permanent magnets is changed. When the first side of the tooth peak is close to the magnetic induction probe, the magnetic resistance is reduced, and the derivative of the magnetic flux is positive, so that a signal pulse is generated; the gaps on the top surfaces of the tooth peaks are the same, so that no induced voltage is generated, and the voltage is 0; when the second side of the tooth peak is close to the magnetic induction probe, the magnetic resistance is increased, and the derivative of the magnetic flux is negative, so that a signal pulse in the opposite direction is generated;
referring to fig. 2, the signal processing module 9, which is implemented without the F/D conversion circuit, includes: signal conditioning circuitry and embedded on-chip programmable systems. The signal conditioning circuit accesses the magnetic induction probe 7, outputs the magnetic induction probe to be directly connected with the embedded on-chip programmable system, and sends out data through the bus interface.
The signal processing module 9, which is coupled to the magnetic induction probe 7 for obtaining the signal, and is configured for:
referring to fig. 4, the signal conditioning circuit in the signal processing module 9 performs denoising, amplification and shaping, amplitude limiting, and negative voltage filtering processing through a diode on the collected pulse signal at the upper part of fig. 4, so as to obtain a square wave positive voltage signal at the lower part of fig. 4;
determining an expected delay between two consecutive signal pulses of the plurality of the signals based on the plurality of signal pulses, the expected delay representing a time interval of the plurality of regular teeth 1;
identifying a first particular pulse associated with the first marker tooth 2 from within the plurality of signal pulses, the particular pulse having a shorter delay than the expected delay, TA＞TB；
Determining, based on the first specific pulse, the specific delay T of the second specific pulse associated with said second mark tooth 3 which occurs consecutively theretoCThe specific delay represents a time interval of the first and second specific pulses;
based on the specific delay T of the first and second specific pulses associated with the first and second marking teeth 2, 3CDetermining the circumferential distance of said first and second index teeth 2, 3 for a certain axial position of the propeller, typically taking the apex angle of the first and second index teeth 2, 3The position is 0 pitch, so the circumferential distance can be used for calculating the pitch of the propeller according to the angle relation of the first mark teeth 2 and the second mark teeth 3;
determining the phase angle of the propeller at the current data acquisition moment relative to the vertex angle boundary line position of the first marking tooth 2 and the second marking tooth 3 based on the time average value of the first specific time and the second specific time generated by the first specific pulse and the second specific pulse, and eliminating the error of the random reference position and the vibration noise caused by only using one marking helical tooth on the phase angle measurement precision;
and calculating the propeller rotation speed based on the expected delay.
Referring to fig. 2, the method for measuring the propeller pitch-phase angle-rotation speed using the sound wheel is implemented without the F/D conversion circuit, and includes the following steps:
the tone wheel 6 and the propeller are coupled to operate with the engine, and the magnetic induction probe 7 generates an associated pulse signal in response to the passage of a plurality of circumferentially evenly spaced conventional teeth 1, first marker teeth 2 and second marker teeth 3 on the outer circumferential surface of the tone wheel and transmits the same to the signal processing module 9. The signal processing module 9 performs denoising, amplification and shaping and amplitude limiting processing on the plurality of pulse signals collected from the magnetic induction probe 7, so as to obtain a square wave signal. The square wave signal is directly transmitted to the embedded on-chip programmable system through the signal conditioning circuit, the embedded on-chip programmable system can read rising edge time or falling edge time from the square wave signal by using codes with specific functions written by software for data processing and storage, and reads out the expected delay, the specific delay and the mean value of the first specific time and the second specific time so as to calculate the rotating speed, the propeller pitch and the phase angle at the current moment. And the rotating speed, the propeller pitch and the phase angle send out data through a bus interface.
Referring to fig. 5, the code of the specific function can make the algorithm have good robustness by setting the threshold e related to the size of the mark tooth, and considering that the data acquisition time is not necessarily the time of the generation of the specific pulse, the specific delay of the latest time, the mean value of the first specific time and the second specific time and the expected delay need to be stored in real time, and has the following logic steps:
step 1: setting a threshold e capable of identifying a first specific pulse, a conventional tooth number Z and a tooth top radius R at first;
step 2: obtaining rising edge time T of three continuous square wave signals1、T2、T3；
And step 3: perform logical operation | (T)2-T1)-(T3-T2) If true, | < e, store the expected delay TA＝T3-T2. If false, returning to the step 2;
and 4, step 4: obtaining rising edge time T of three continuous square wave signals1、T2、T3；
And 5: perform a logical operation | TA-(T2-T1) If | e, the storage specific delay TC＝T2-T1Time mean value T of first specific time and second specific timeS＝(T2+T3)/2. If false, returning to the step 4;
step 6: whether to execute the data acquisition instruction, if true, obtaining the time T of the current instruction execution timeNAnd calculated as follows, pitch ═ pi · R · TC/{(Z+1)·TATan (a °), phase angle 360 · (T)N-TS)/{(Z+1)·TA) 60/{ (Z +1) } T, speed n ═ 60/{ (Z +1) }AAnd finally ending. If false, return to step 2.
The working principle of the invention is as follows: the magnetic induction probe 7 consists of an induction coil and a permanent magnet material, the change of the gap delta between the tone wheel and the permanent magnet is caused in the rotation process of the tone wheel, the magnetic resistance and the gap size are directly related, the time change rate of the magnetic flux is represented, and the changing magnetic field can generate changing current, so the magnetic induction probe 7 can respond to the associated pulse signals generated by the passing of a plurality of conventional teeth 1, a first mark tooth 2 and a second mark tooth 3 on the tone wheel, and the expected delay T is calculated through a signal processing module 9AA specific delay TCAnd calculating the rotation speed and the phase angle according to the time average value Ts of the first specific time and the second specific time. For the pitch, the pitch of the first mark tooth 2 and the second mark tooth 3 is different in the structure of the tone wheel, the pitch angle position of the first mark tooth 2 and the second mark tooth 3 is generally 0 pitch, so the pitch can be calculated by trigonometric function conversion,
the functions are as follows: high-precision measurement of the pitch, phase angle and rotational speed of the propeller can be carried out by using only magneto-electric sensors with tone wheels, and the measured parameters of the sensors are provided for the control of the turboprop.
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some simple modifications, equivalent changes and modifications to some technical features without creative efforts based on the disclosed technical contents, and all fall into the technical solution of the present invention.
Claims (5)
1. A propeller pitch-phase angle-rotating speed measuring device using a tone wheel comprises a tone wheel (6), a magnetic induction probe (7) and a signal processing module (9). The tone wheel comprises a plurality of regular teeth (1) uniformly spaced in the circumferential direction provided on the outer circumferential surface of the tone wheel and first and second flag teeth (2, 3) provided on the outer surface, the first and second flag teeth (2, 3) being respectively closer to some of the regular teeth (1) adjacent thereto in the circumferential direction and indicating a reference position of a primary phase angle of the propeller, the positions of the apex angles of the first and second flag teeth (2, 3) being indicated as reference positions of the pitch of the propeller, the tone wheel being configured to rotate or move axially with the propeller during operation of the propeller engine;
said magnetic induction probe (7), fixed to a stationary part of the engine, adjacent to said tone wheel and configured for generating a signal in response to the passage of said normal teeth (1) and said marked teeth, said signal comprising a plurality of signal pulses whose timing of occurrence corresponds to the timing of passage of said plurality of normal teeth (1), first marked teeth (2) and second marked teeth (3) during the rotation of said tone wheel (6);
the signal processing module (9) coupled to the magneto inductive probe (7) for obtaining the signal and configured for:
determining an expected delay between two consecutive signal pulses of the plurality of the signals based on the plurality of signal pulses, the expected delay representing a time interval of the plurality of regular teeth (1);
identifying a first particular pulse associated with the first marker tooth (2) from within the plurality of signal pulses, the particular pulse having a shorter delay than the expected delay;
-determining, on the basis of a first specific pulse, a specific delay of a second specific pulse associated with said second marker tooth (3) with which it occurs consecutively, said specific delay representing the time interval of said first and second specific pulses;
determining a circumferential distance of said first (2) and second (3) marker teeth for an axial position of the propeller based on the specific delays of said first and second specific pulses associated with said first (2) and second (3) marker teeth, typically taking the apex angle position of the first (2) and second (3) marker teeth to be 0 pitch, so that said circumferential distance can be used to calculate the pitch of the propeller from the angular relationship of the first (2) and second (3) marker teeth;
determining the phase angle of the propeller at the current data acquisition moment relative to the vertex angle boundary line position of the first marking tooth (2) and the second marking tooth (3) based on the time average value of the first specific time and the second specific time generated by the first specific pulse and the second specific pulse;
and calculating the propeller rotation speed based on the expected delay.
2. A tone wheel unitary structure according to claim 1, comprising teeth, a cylinder (4) and a through hole (5). The tone wheel tooth structure is characterized in that the thickness of the tone wheel is more than or equal to the variation range of the pitch; the plurality of conventional teeth (1) are arranged in parallel in the circumferential direction and are parallel to the axis of the tone wheel (6), the volume and the mass of the first marking tooth (2) and the second marking tooth (3) are respectively set to be half of any one of the other conventional teeth (1), and the first marking tooth (2) and the second marking tooth (3) form the same angle of a degrees with the parallel line of the conventional teeth (1) arranged in the circumferential direction; the through hole (5) is used for being sleeved on a rotating shaft of the propeller.
3. A signal processing module (9) as claimed in claim 1, characterized by comprising: the signal conditioning circuit, the F/D conversion circuit and the embedded on-chip programmable system. The signal conditioning circuit accesses the magnetic induction probe (7) and is provided with a first connecting end and a second connecting end, and the first connecting end is directly connected with the embedded on-chip programmable system and sends data out through a bus interface; the second connecting end is connected with the F/D conversion circuit, then connected with the embedded on-chip programmable system and finally sends out data through the bus interface.
4. A method of measuring a propeller pitch-phase angle-rotation speed measuring apparatus using a tone wheel according to claim 1, comprising the steps of:
the tone wheel (6) and the propeller are coupled together to work with the engine, and the magnetic induction probe (7) generates an associated pulse signal in response to the passage of a plurality of regular teeth (1), first marker teeth (2) and second marker teeth (3) which are uniformly spaced in the circumferential direction on the outer circumferential surface of the tone wheel, and transmits the pulse signal to the signal processing module (9). The signal processing module (9) carries out the processes of denoising, amplifying and shaping, amplitude limiting and negative voltage filtering on the pulse signals collected from the magnetic induction probe (7), thereby obtaining positive square signals. The square wave signal is directly transmitted to an embedded on-chip programmable system through a first connecting end of the signal conditioning circuit, the embedded on-chip programmable system can read rising edge time or falling edge time from the square wave signal by using codes with specific functions written by software to process and store data, read out the expected delay, the specific delay and the mean value of the first specific time and the second specific time, and further calculate the rotating speed, the propeller pitch and the phase angle at the current moment; the square wave signal can also be transmitted to the F/D conversion circuit through the second connecting end of the signal conditioning circuit, the frequency quantity of the square wave signal is converted into the digital quantity of the rotating speed in the F/D conversion circuit, and finally the digital quantity is transmitted to the embedded on-chip programmable system. The rotating speed, the propeller pitch and the phase angle are sent out through a bus interface.
5. The function-specific code of claim 4, having the logic steps of:
step 1: setting a threshold e capable of identifying a first specific pulse, a conventional tooth number Z and a tooth top radius R at first;
step 2: obtaining rising edge time T of three continuous square wave signals1、T2、T3；
And step 3: perform logical operation | (T)2-T1)-(T3-T2) If true, | < e, store the expected delay TA＝T3-T2. If false, returning to the step 2;
and 4, step 4: obtaining rising edge time T of three continuous square wave signals1、T2、T3；
And 5: perform a logical operation | TA-(T2-T1) If | e, the storage specific delay TC＝T2-T1Time mean value T of first specific time and second specific timeS＝(T2+T3)/2. If false, returning to the step 4;
step 6: whether to execute the data acquisition instruction, if true, obtaining the time T of the current instruction execution timeNAnd calculated as follows, pitch ═ pi · R · TC/{(Z+1)·TATan (a °), phase angle 360 · (T)N-TS)/{(Z+1)·TA) 60/{ (Z +1) · T at a rotation speed nAAnd finally ending. If false, return to step 2.
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| CN202011542906.8A CN112697438B (en) | 2020-12-23 | 2020-12-23 | Turboprop engine pitch-phase angle-rotating speed measuring device and method based on tone wheel |
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| CN202011542906.8A CN112697438B (en) | 2020-12-23 | 2020-12-23 | Turboprop engine pitch-phase angle-rotating speed measuring device and method based on tone wheel |
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| CN113959722A (en) * | 2021-10-28 | 2022-01-21 | 南京航空航天大学 | Torque-propeller pitch-phase angle-rotating speed integrated measuring device and method based on tone wheel |
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