CN106645776B - The measuring wheel speed system and measuring wheel speed method of airplane brake system - Google Patents
The measuring wheel speed system and measuring wheel speed method of airplane brake system Download PDFInfo
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- CN106645776B CN106645776B CN201611119874.4A CN201611119874A CN106645776B CN 106645776 B CN106645776 B CN 106645776B CN 201611119874 A CN201611119874 A CN 201611119874A CN 106645776 B CN106645776 B CN 106645776B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
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- Regulating Braking Force (AREA)
Abstract
The invention discloses a kind of measuring wheel speed system of airplane brake system and measuring wheel speed method, measuring wheel speed side includes the following steps: S1, in a collection period, acquires double redundancy wheel speed signal；S2, the double redundancy wheel speed signal of acquisition is converted into two square-wave signals and is counted respectively；S3, it reads count twice respectively, whether identical read more twice, then wheel velocity signal capturing is normal if they are the same, if not identical, repeatedly step S3, and it is n, n≤10 that step S3, which repeats step,；Measuring wheel speed system includes double redundancy wheel velocity signal capturing module, wheel speed signal conditioning module, counting module, reading module, contrast module, loop module, obtains module.The present invention is multiple by the double redundancy wheel speed signal for repeating to read acquisition in a collection period, and each dual signal is compared, to avoid leading to the mispick of wheel speed signal because interfering and being delayed, which ensure that the accuracy of airplane brake system wheel velocity signal capturing.
Description
Technical field
The present invention relates to aircraft brake technologies, more particularly, to the measuring wheel speed system and wheel speed of a kind of airplane brake system
Acquisition method.
Background technique
Wheel speed signal is the most important feedback signal of airplane brake system, and aircraft ABS system passes through acquisition and operation wheel speed
Signal detects the rolling condition of wheel, judges its slippery conditions, determines whether braking system needs to get off the brakes, to make full use of
The frictional force that ground can be provided shortens braking distance, improves the abrasion of tire simultaneously, improves the stationarity and safety of braking
Property.
The safety and reliability of system is generally improved using the remaining form of dual signal wheel speed sensors, and for double
It is which normally takes, all normally then takes and rule of thumb accept or reject, is all abnormal which that remaining signal, which accepts or rejects usual mode, assigns zero,
Filtering or use simple median filtering method or more complicated kalman, wavelet filtering to data, due to above-mentioned wheel speed
The acquisition of signal is easy to appear mispick data, and wheel speed signal is caused to be occasionally lost, and dual signal wheel speed sensors be in high temperature,
Vibration etc. is easy to appear many interference signals more under rugged environment, therefore in low speed brake, cause undercarriage " walking " or
The weak phenomenon of low speed brake.
Summary of the invention
It is an object of the invention to overcome above-mentioned technical deficiency, propose a kind of airplane brake system measuring wheel speed system and
Measuring wheel speed method solves wheel velocity signal capturing in the prior art and the technical issues of mispick leads to low speed walking, shake easily occurs.
To reach above-mentioned technical purpose, technical solution of the present invention provides a kind of measuring wheel speed side of airplane brake system
Method includes the following steps:
S1, in a collection period, acquire double redundancy wheel speed signal；
S2, the double redundancy wheel speed signal of acquisition is converted to two square-wave signals, and two square-wave signals is carried out respectively
It counts；
S3, it reads count twice respectively, whether identical read more twice, then wheel velocity signal capturing is normal if they are the same, if
It is not identical, then repeatedly step S3, and it is n, n≤10 that step S3, which repeats step,.
Preferably, the measuring wheel speed method further includes step S4: the wheel speed letter of more two neighboring collection period acquisition
Number, and the wheel speed signal for calculating two neighboring collection period acquisition is poor, and judges that wheel speed changes when braking according to wheel speed signal difference
It is whether normal.
Preferably, the step S4 further includes the range area that multiple range intervals are arranged, and are located at according to wheel speed signal difference
Between judge wheel speed intensity of anomaly.
Preferably, the calculation formula of the wheel speed signal difference are as follows:
D=| Yn+1-Yn|+If
Wherein, d is that the wheel speed signal of two neighboring collection period is poor, Yn+1For a upper collection period acquisition wheel speed signal,
YnFor the wheel speed signal of current collection period acquisition, IfFor abnormal adjustment parameter.
Preferably, step S3 reading is sixteen bit, sixteen bit number by low eight-digit number and high eight-bit array at.
Preferably, the step S3 is the low eight-digit number read more twice.
Meanwhile the present invention also provides a kind of measuring wheel speed systems of airplane brake system, comprising:
Double redundancy wheel velocity signal capturing module, for acquiring the double redundancy wheel speed signal of aircraft in a collection period；
Wheel speed signal conditioning module, for the double redundancy wheel speed signal of acquisition to be converted to two square-wave signals；
Counting module, for being counted in real time to two square-wave signals；
Module is read, for reading two real-time countings of the counting module respectively；
Whether contrast module, two readings read for comparative reading module are identical；
Loop module, for not driving reading module duplicate reading simultaneously when two readings；
Acquisition module is used as correspondence for obtaining a wheel speed signal in double redundancy wheel speed signal when two readings are identical
The wheel speed signal of collection period.
Preferably, the measuring wheel speed system further includes the wheel speed signal for storing multiple and different collection period acquisitions
Memory module, for more two neighboring collection period acquisition wheel speed signal wheel speed signal difference comparison module, for sentencing
The determination module of range intervals belonging to the wheel speed signal that breaks is poor.
Compared with prior art, the present invention reads the double redundancy wheel speed signal acquired by repeating in a collection period
Repeatedly, and to each dual signal it compares, thus avoid leading to the mispick of wheel speed signal because interfering and being delayed, which ensure that
The accuracy of airplane brake system wheel velocity signal capturing.
Detailed description of the invention
Fig. 1 is the collecting flowchart block diagram of the measuring wheel speed method of airplane brake system of the invention；
Fig. 2 is the connection block diagram of the measuring wheel speed system of airplane brake system of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1, Fig. 2 are please referred to, the embodiment provides the measuring wheel speed systems and wheel of a kind of airplane brake system
Fast acquisition method, measuring wheel speed method include the following steps:
S1, in a collection period, acquire double redundancy wheel speed signal；
S2, the double redundancy wheel speed signal of acquisition is converted to two square-wave signals, and two square-wave signals is carried out respectively
It counts；
S3, it reads count twice respectively, whether identical read more twice, then wheel velocity signal capturing is normal if they are the same, if
It is not identical, then repeatedly step S3, and it is n, n≤10 that step S3, which repeats step,；
The wheel speed signal that S4, more two neighboring collection period acquire, and calculate the wheel of two neighboring collection period acquisition
Fast signal difference, and judge that whether normal wheel speed changes when braking according to wheel speed signal difference.
Specifically, the present embodiment passes through pair in double redundancy wheel velocity signal capturing module 1 in real time one collection period of acquisition
Remaining wheel speed signal preferably uses dual signal wheel speed sensors to be acquired, and the signal of its acquisition have passed through at remaining
Two wheel speed signals of reason, acquisition are improved by wheel speed signal conditioning module 2, mainly believe the wheel speed of approximate sine wave
The square-wave signal convenient for subsequent counter processing number is converted to, and the square-wave signal of conversion is then carried out real-time counting by counting module 3,
Count results are read out by reading module 4, are compared two that reading module 4 is read by contrast module 5 after the completion of reading
Whether data are identical, identical, and it is all as the acquisition to start the wheel speed signal obtained in two wheel speed signals of acquisition of module 6
The wheel speed signal of phase, it is different then start loop module 7 carry out duplicate reading, until read two data it is identical, in order to guarantee
Operation efficiency repeats the number read and is less than or equal to 10 times.
Wherein, the present embodiment reading module 4 may be configured as sixteen bit, specifically first read low eight-digit number, then read high by eight
Digit, and the low eight-digit number that then comparative reading module is first read of contrast module 5, when the corresponding low eight-digit number of two wheel speed signals
When identical, then illustrate that wheel velocity signal capturing is normal, and the corresponding wheel speed signal for obtaining the secondary collection period, when two wheel speed signals
When corresponding low eight-digit number difference, then starts loop module 7 and carry out duplicate reading.Due to the present embodiment duplicate reading number highest
It is 10 times, when 10 readings are not inconsistent requirement, then wheel speed signal is assigned a value of zero.
And in order to further increase the reliability of wheel velocity signal capturing and adaptability, avoid interference signal from entering measuring wheel speed
In the process, step S4 described in the present embodiment further includes the range area that multiple range intervals are arranged, and are located at according to wheel speed signal difference
Between judge wheel speed intensity of anomaly, specially in braking, the difference for the wheel speed signal that two neighboring collection period is acquired is carried out
Classification, such as settable 0~m, m~m+20, m+20~m+40, m+40, with first-class several range intervals, wherein m can be used as difference
Radix, for ease of description, the present embodiment are illustrated using aforementioned four range intervals as four gears, and 0~m corresponds to a1
Shelves, m~m+20 correspond to a2 grades, m+20~m+40 correspond to a3 grades, m+40 or more correspondence a4 grades.In order to guarantee accuracy, the wheel
The calculation formula of fast signal difference are as follows:
D=| Yn+1-Yn|+If
Wherein, d is that the wheel speed signal of two neighboring collection period is poor, Yn+1For a upper collection period acquisition wheel speed signal,
YnFor the wheel speed signal of current collection period acquisition, IfFor abnormal adjustment parameter.
When the difference of the wheel speed signal of two neighboring collection period acquisition is located at a1 grades of interval range, then illustrate wheel speed
Signal acquisition is normal, belongs to normal fluctuation range, when the difference for the wheel speed signal that two neighboring collection period acquires is greater than poor
When being worth benchmark, then it is abnormal to illustrate that the wheel speed signal of acquisition occurs, and the difference of the wheel speed signal of two neighboring collection period acquisition
Value is bigger, its corresponding gear is higher, then specification exception degree is bigger, needs quickly through filter correction to avoid mispick.
Its normal wheel speed signal that multiple and different collection period acquisitions are stored especially by memory module 8, that is, work as acquisition
When module 6 obtains the wheel speed signal of corresponding acquisition current period, believe by comparing module 9 and the wheel speed of a upper collection period
It number is compared, and determines whether the wheel speed signal of current collection period acquisition is located at normal interval range by determination module 10
It is interior, illustrate that the wheel speed signal of collection period acquisition is normal if being located within the scope of normal interval, otherwise by filter correction, together
When revised wheel speed signal can correspond to and be stored in memory module 8, in order to compared with the wheel speed signal in subsequent acquisition period.
Compared with prior art, the present invention reads the double redundancy wheel speed signal acquired by repeating in a collection period
Repeatedly, and to each dual signal it compares, thus avoid leading to the mispick of wheel speed signal because interfering and being delayed, which ensure that
The accuracy of airplane brake system wheel velocity signal capturing.
The above described specific embodiments of the present invention are not intended to limit the scope of the present invention..Any basis
Any other various changes and modifications that technical concept of the invention is made should be included in the guarantor of the claims in the present invention
It protects in range.
Claims (5)
1. a kind of measuring wheel speed method of airplane brake system, which comprises the steps of:
S1, in a collection period, acquire double redundancy wheel speed signal；
S2, the double redundancy wheel speed signal of acquisition is converted to two square-wave signals, and two square-wave signals is counted respectively；
S3, it reads count twice respectively, whether identical read more twice, then wheel velocity signal capturing is normal if they are the same, if not phase
Together, then repeatedly step S3, and it is n, n≤10 that step S3, which repeats step,；
S4: the wheel speed signal of more two neighboring collection period acquisition, and calculate the wheel speed letter of two neighboring collection period acquisition
Number difference, and whether wheel speed variation is normal when judging braking according to wheel speed signal difference；Multiple range intervals are set, and are believed according to wheel speed
The range intervals that number difference is located at judge wheel speed intensity of anomaly；The calculation formula of the wheel speed signal difference are as follows:
D=| Yn+1-Yn|+If
Wherein, d is that the wheel speed signal of two neighboring collection period is poor, Yn+1For the wheel speed signal of upper collection period acquisition, YnFor
The wheel speed signal of current collection period acquisition, IfFor abnormal adjustment parameter.
2. the measuring wheel speed method of airplane brake system according to claim 1, which is characterized in that the step S3 reading
For sixteen bit, sixteen bit number by low eight-digit number and high eight-bit array at.
3. the measuring wheel speed method of airplane brake system according to claim 2, which is characterized in that the step S3 be than
The low eight-digit number read more twice.
4. a kind of perform claim requires the measuring wheel speed system of the airplane brake system of 1~3 any measuring wheel speed method,
It is characterized in that, comprising:
Double redundancy wheel velocity signal capturing module, for acquiring the double redundancy wheel speed signal of aircraft in a collection period；
Wheel speed signal conditioning module, for the double redundancy wheel speed signal of acquisition to be converted to two square-wave signals；
Counting module, for being counted in real time to two square-wave signals；
Module is read, for reading two real-time countings of the counting module respectively；
Whether contrast module, two readings read for comparative reading module are identical；
Loop module, for not driving reading module duplicate reading simultaneously when two readings；
Module is obtained, is used as corresponding acquisition for obtaining a wheel speed signal in double redundancy wheel speed signal when two readings are identical
The wheel speed signal in period.
5. the measuring wheel speed system of airplane brake system according to claim 4, which is characterized in that the measuring wheel speed system
System further includes for storing the memory module for the wheel speed signal that multiple and different collection period acquire, for more two neighboring acquisition
The comparison module of the wheel speed signal difference of the wheel speed signal of period acquisition, for judge the wheel speed signal it is poor belonging to range intervals
Determination module.
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| CN201611119874.4A CN106645776B (en) | 2016-12-08 | 2016-12-08 | The measuring wheel speed system and measuring wheel speed method of airplane brake system |
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| CN106645776B true CN106645776B (en) | 2019-07-12 |
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| CN103513062A (en) * | 2013-10-08 | 2014-01-15 | 潍柴动力股份有限公司 | Contrast test device of speed sensor |
| CN105424966A (en) * | 2015-12-11 | 2016-03-23 | 中国航空工业集团公司西安航空计算技术研究所 | Engine rotating speed measurement circuit and method |
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| DE2942891A1 (en) * | 1979-10-24 | 1981-05-07 | Bernhard Dipl.-Phys. 1000 Berlin Schallopp | Automatic revolution rate limit monitor for prime movers - has fail-safe circuit for checking pulse integral counter resetting |
| JP2000242631A (en) * | 1999-02-24 | 2000-09-08 | Chokosoku Network Computer Gijutsu Kenkyusho:Kk | Data conversion system |
| CN101339203A (en) * | 2007-11-20 | 2009-01-07 | 北京金万安汽车电子技术研发有限公司 | Automobile wheel speed sensor fault monitoring method |
| CN103513062A (en) * | 2013-10-08 | 2014-01-15 | 潍柴动力股份有限公司 | Contrast test device of speed sensor |
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