CN108861926B - A kind of engineering elevator person number detection device and method based on far-infrared technique - Google Patents
A kind of engineering elevator person number detection device and method based on far-infrared technique Download PDFInfo
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- CN108861926B CN108861926B CN201810475002.4A CN201810475002A CN108861926B CN 108861926 B CN108861926 B CN 108861926B CN 201810475002 A CN201810475002 A CN 201810475002A CN 108861926 B CN108861926 B CN 108861926B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0012—Devices monitoring the users of the elevator system
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Abstract
The invention proposes a kind of engineering elevator person number detection device and method based on far-infrared technique, for solving the low technical problem of accuracy in detection existing in the prior art.Pyroelectric sensor detection human body far infrared signal is simultaneously converted into electric signal output；Filter amplification circuit is filtered amplification to electric signal；The error signal of microcontroller calculating pyroelectric sensor；Microcontroller calculates the maximum value and minimum value of the error signal of pyroelectric sensor；The error signal state for time mark of microcontroller calculating pyroelectric sensor；The error signal state of microcontroller calculating pyroelectric sensor；Microcontroller, which calculates number in engineering lift car, always to be changed；Microcontroller is added to obtain current engineering elevator number by having number always to change with number in engineering lift car in engineering elevator Central Plains.The present invention has the characteristics that accuracy in detection is high, testing cost is low and is easily installed.
Description
Technical field
The invention belongs to electric detective technology fields, are related to a kind of engineering elevator number detection dress based on far-infrared technique
It sets and method, it is therefore an objective to improve engineering elevator number variation accuracy in detection and reduce testing cost, to reduce engineering elevator
In operational process because number overload caused by elevator interruption of service.
Background technique
Nowadays economic fast development has established solid material base for emerging one after another for high building, and in the building of high building
In the process, because of need of work, workpeople needs to shuttle between ground and each floor, and therefore, most of building site is all in high building
Inside it is equipped with engineering elevator.Currently, many local governments have all been promulgated in succession on how to take the policy of engineering elevator safely,
Therefore many engineering elevators not only identify maximum bearing capacity in carriage, while also having demarcated and at most having held terraced number.Wherein, most
Hold terraced number is calculated by a large amount of simulated experiments more, has very high reference value.Due to the electricity of current engineering
Ladder is not mature enough in number detection technique, can not effectively be taken precautions against number overload problems, causes to multiply in engineering elevator
There are very big hidden danger for the life security of visitor.
Currently used elevator number detection method mainly has the number detection method based on weight, the number based on image
Detection method, the number detection method based on infrared counter and the number detection method based on pyroelectric sensor, in which:
Elevator number detection method based on weight can obtain current elevator by installing weight sensor in elevator
The load-carrying of carriage, can be with the passengers quantity in the current lift car of "ball-park" estimate according to the load-carrying of lift car, can not be to people
It is effectively distinguished with object, and accuracy in detection is not high.
Number detection method based on image can be obtained in lift car by installing monitoring device in lift car
Live image, then using image procossing the available current lift car of related algorithm in passengers quantity, this kind of side
Method has very high requirement to the picture quality of acquisition, and hardware cost is high, and software design is complicated.
Number detection method popularization based on infrared counter is high, easy to operate, it can be determined that the disengaging feelings of personnel
Condition, real-time is good, but needs a transmitter and a receiver, cannot distinguish between people and object, requires installation environment high.
Number detection method based on pyroelectric sensor, the far infrared signal that human body is issued using pyroelectric sensor
Especially sensitive characteristic can distinguish people and object, but when this kind of method carries out number detection when more people pass in and out,
Accuracy in detection is not high.
Such as application publication number CN103942869B, it is entitled that " a kind of testing staff in construction elevator passes in and out quantity
The patent application of method " discloses a kind of number of people in lift car detection method.This method is formed using multiple groups pyroelectric sensor
Array obtains the far infrared signal of sending when human body passes through, and differentiates the direction of personnel's disengaging from vertical direction and calculates human body
The far infrared signal of sending simultaneously calculate human body sending far infrared signal the space occupied width, by by the space width with
The preset human body shoulder breadth value of single-chip microcontroller is compared, and the quantity of personnel's disengaging is calculated with this.The pyroelectricity that this kind of method needs
Number of sensors is huge, at high cost；This kind of method computing staff needs the far infrared signal for issuing human body to account for when passing in and out quantity
Space width is made comparisons with preset human body shoulder breadth, and human body shoulder breadth varies with each individual, while when personnel are with different postures
Far infrared signal the space occupied width that human body issues when traveling is also had nothing in common with each other, so that the detection for affecting this method is accurate
Degree.
Summary of the invention
It is an object of the invention to overcoming above-mentioned the shortcomings of the prior art, propose a kind of based on far-infrared technique
Engineering elevator person number detection device and method, for improving the accuracy of engineering elevator number detection and reducing testing cost.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of engineering elevator person number detection device based on far-infrared technique, which is characterized in that including being mounted on elevator car
Compartment door top cavity assembly 1, the cavity assembly 1 include the first cavity 11, and with behind 11 left and right side of the first cavity
The second cavity 12 and third cavity 13 for being connected and forming an angle are held, a far-infrared sensor is respectively installed in three cavitys
2, the far-infrared sensor 2 is perceived the far infrared signal that human body generates and is simultaneously converted by the through slot being arranged on cavity leading flank
For electric signal；The position that the trailing flank of three cavitys is adjacent is provided with the 4th cavity 14, is mounted therein with including power supply electricity
Road 31, filter amplification circuit 32, serial port module 33 and microcontroller 34 number measurement processor plate 3, the power circuit 31,
For providing operating voltage to far-infrared sensor 2, serial port module 33 and microcontroller 34, the filter amplification circuit 32 is used
It is filtered and amplifies in the signal transmitted to far-infrared sensor 2, the serial port module 33 is used for person number detection device and sedan-chair
Connection communication between the safety monitoring system of compartment, the microcontroller 34, for calculating number in lift car.
The above-mentioned engineering elevator person number detection device based on far-infrared technique, 11 leading flank of the first cavity and carriage
Ground is parallel.
The above-mentioned engineering elevator person number detection device based on far-infrared technique, first cavity 11, the second cavity 12
Through slot shape with the setting of 13 leading flank of third cavity is rectangle, and long side is in plane where the projection on carriage ground and car door
In parallel.
The above-mentioned engineering elevator person number detection device based on far-infrared technique, the far-infrared sensor 2, using passive
Formula pyroelectric infrared sensor, central point and the through slot central point on 2 place cavity leading flank of infrared sensor of infrared probe
Line perpendicular to the cavity leading flank.
A kind of engineering elevator number detection method based on far-infrared technique, includes the following steps:
1, pyroelectric sensor is converted and is exported to the signal detected:
The far infrared signal detected in its detection zone is converted electric signal d by pyroelectric sensorcAnd export,
In, c expression pyroelectric sensor label, c=1,2,3；
2, filter amplification circuit is to dcIt is filtered and amplifies:
Filter amplification circuit is to dcIt is filtered, and filtered electric signal is amplified, the electric signal amplified
gc；
3, microcontroller calculates the error signal z of pyroelectric sensorc(k):
3a microcontroller obtains k instance sample signal sc(k):
Microcontroller is to gcThe AD sampling of frequency is fixed, obtains k instance sample signal sc(k), k indicates sampling sequence number,
K=1,2,3 ...；
3b microcontroller is to sc(k) it is normalized, the digital signal r after being normalizedc(k):
rc(k)=λ sc(k)
Wherein, λ is normalized parameter；
3c microcontroller is to rc(k) it is filtered, and calculates the corresponding digital signal x of each pyroelectric sensor after filteringc
(k) mean value obtains mean value signal mc(k)；
3d microcontroller calculates the error signal y of each pyroelectric sensorc(k), and to yc(k) amplitude transformation is carried out, is obtained
Error signal z after to amplitude transformationc(k), in which:
yc(k)=xc(k)-mc(k)
zc(k)=ρcyc(k)
Wherein, ρcFor error signal amplification coefficient；
4 microcontrollers calculate k moment error signal zc(k) maximum value Mxc(k) and minimum M nc(k)；
5 microcontrollers calculate k moment error signal state for time mark Tc(k):
Wherein, th0 is preset threshold；
6 microcontrollers calculate k moment error signal state Rsc(k):
Wherein, th1 is preset threshold；
7 microcontrollers calculate total number of persons in lift car and change PNc(k):
7a microcontroller calculates k moment pre- number and changes leader will fhc(k):
7b microcontroller calculates k moment pre- number and changes tail tag will fec(k):
Wherein, th2 is preset threshold；
7c microcontroller calculates k moment each channel number and changes pc(k):
7d microcontroller calculates total number of persons in k moment lift car and changes PNc(k):
(8) microcontroller calculates number in k moment lift car:
Number in k-1 lift car is changed to obtain the k moment by microcontroller plus total number of persons in current time lift car
Number in lift car.
Compared with the prior art, the invention has the following advantages:
1. number change detecting device monitoring region of the invention is to put down close to lift car doorway and with where car door
The parallel plane domain in face, only carries out number variation monitoring when personnel pass in and out lift car, and elevator internal and external environment becomes number
The interference for changing detection is small, and number variation monitoring method of the invention is to pyroelectric sensor during personnel's disengaging lift car
The signal waveform change procedure perceived is detected, and the situation that personnel pass in and out elevator can be distinguished, and accuracy in detection is high.
People in lift car when 2. more people's disengaging lift cars can be realized using less pyroelectric sensor in the present invention
Number detection, hardware design and software design are simple, reduce testing cost.
3. detection device of the invention occupies little space, and is easily installed.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of detection device of the present invention；
Fig. 2 is the composite structure body figure of detection device of the present invention；
Fig. 3 is the number measurement processor plate figure of detection device of the present invention；
Fig. 4 is the implementation process block diagram of detection method.
Specific implementation method
In the following with reference to the drawings and specific embodiments, present invention is further described in detail:
Referring to Fig.1, detection device of the invention, including being mounted on cavity assembly 1 above elevator cab door, far infrared
Sensor 2 and number measurement processor plate 3.
Reference Fig. 2, the above-mentioned engineering elevator person number detection device based on far-infrared technique, the cavity assembly include
First cavity 11, and the second cavity 12 and third cavity that are connected and form an angle with 11 left and right side rear end of the first cavity
13, a far-infrared sensor is respectively installed in three cavitys；The adjacent position in the trailing flank of three cavitys is provided with
Four cavitys 14 are mounted therein with number measurement processor plate.
Referring to Fig. 3, the above-mentioned engineering elevator person number detection device based on far-infrared technique, the number measurement processor
Plate includes power circuit 31, filter amplification circuit 32, serial port module 33 and microprocessor 34, the power circuit 31, for giving
Far-infrared sensor and microprocessor provide operating voltage, the filter amplification circuit 32, for transmitting to far-infrared sensor
Signal be filtered and amplify, the serial port module 33 is for company between person number detection device and car safety monitoring system
Connect letter, the microcontroller 34, for calculating number in lift car.
The above-mentioned engineering elevator person number detection device based on far-infrared technique, the first cavity leading flank and carriage
Face is parallel.
The above-mentioned engineering elevator person number detection device based on far-infrared technique, first cavity, the second cavity and
The through slot shape of three cavity leading flanks setting is rectangle, and rectangle long side length is 5mm, and rectangle bond length is 1mm, and long side exists
The projection on carriage ground is parallel with plane where car door, and the angle of the first cavity and the second cavity, third cavity is 30 °,
Pass through the first cavity, the second cavity, the rectangular straight slot of third cavity leading flank setting and the first cavity and the second cavity, third chamber
Plane where with elevator cab door that the detection range of 3 pyroelectric sensors can be limited to one by the angle of body is parallel to put down
Face.
The above-mentioned engineering elevator person number detection device based on far-infrared technique, the composite structure body the first cavity,
Far-infrared sensor is installed in second cavity and third cavity, and number measurement processor plate is installed in the 4th cavity
Afterwards, it needs to cover lid, it is ensured that extraneous far infrared signal can only pass through the first cavity, the second cavity and third cavity leading flank
The through slot of upper setting is passed in the first cavity, the second cavity and third cavity, to be installed in the first cavity, the second cavity
It is sensed with the far-infrared sensor in third cavity.
The above-mentioned engineering elevator person number detection device based on far-infrared technique, the far-infrared sensor, using passive
Formula pyroelectric infrared sensor, model HC-SR501, where the central point and infrared sensor of infrared probe on front side of cavity
The line of through slot central point is perpendicular to the cavity leading flank on face.
The above-mentioned engineering elevator number change detecting device based on far-infrared technique, the microcontroller use
STM32F105 microcontroller, dominant frequency frequency are 72MHz.
Referring to Fig. 4, detection method of the invention includes the following steps:
1, pyroelectric sensor is converted and is exported to the signal detected:
The far infrared signal detected in its detection zone is converted electric signal d by pyroelectric sensorcAnd export,
In, c expression pyroelectric sensor label, c=1,2,3；
2, filter amplification circuit is to dcIt is filtered and amplifies:
Filter amplification circuit is to dcIt is filtered, and filtered electric signal is amplified, the electric signal amplified
gc；
3, microcontroller calculates the error signal z of pyroelectric sensorc(k):
3a microcontroller obtains k instance sample signal sc(k):
Microcontroller is to gcIt carries out the AD that frequency is 1KHz to sample, obtains k instance sample signal sc(k), k indicates sampling sequence
Number, k=1,2,3 ...；
3b microcontroller is to sc(k) it is normalized, the digital signal r after being normalizedc(k):
rc(k)=λ sc(k)
Wherein, λ is normalized parameter, and λ=3.3/4096 can be by r by normalization operationc(k) it is limited in 0~3.3
Range reduce the EMS memory occupation of microcontroller to reduce the digit of data storage, improve microcontroller arithmetic speed；
3c microcontroller is to rc(k) it is filtered, and calculates the corresponding digital signal x of each pyroelectric sensor after filteringc
(k) mean value obtains mean value signal mc(k):
By to rc(k) it is filtered, and calculates the corresponding digital signal x of each pyroelectric sensor after filteringc(k)
Mean value can reduce the noise jamming in microcontroller calculating process, keep data smoothened, and then improve number variation detection
The accuracy of method；
3d microcontroller calculates the error signal y of each pyroelectric sensorc(k), and to yc(k) amplitude transformation is carried out, is obtained
Error signal z after to amplitude transformationc(k), in which:
yc(k)=xc(k)-mc(k)
zc(k)=ρcyc(k)
Wherein, ρcFor error signal amplification coefficient, by using pyroelectric sensor performance, there are fine distinctions, lead to
It crosses the error signal that 3 groups of pyroelectric sensors obtain to have differences in amplitude, needs the error to each pyroelectric sensor
Signal is corrected, to improve the accuracy of number change detecting method；
4, microcontroller calculates k moment error signal zc(k) maximum value Mxc(k) and minimum M nc(k):
5, microcontroller calculates k moment error signal state for time mark Tc(k):
Wherein, th0 is preset threshold, th0=0.2；
6, microcontroller calculates k moment error signal state Rsc(k):
Wherein, th1 and t is preset threshold, th1=0.1, t=400, Rsc(k) value of value is Rsc(k)=1,0, -1,
Rsc(k)=1 k moment error signal state is represented as propradation, Rsc(k)=0 it is steady for representing k moment error signal state
State, Rsc(k)=- 1 k moment error signal state is represented as decline state, Tc(k) for carrying out propradation or decline state
Conversion to steady state.Work as Rsc(k)=1, Rsc(k-1)=- 1 when, micro process thinks the mistake in k moment pyroelectric sensor
Difference signal experienced a wave crest；Rsc(k)=1, Rsc(k-1)=- 1 when, micro process thinks in k moment pyroelectric sensor
Error signal experienced a trough；
7, microcontroller calculates total number of persons variation PN in lift carc(k):
7a microcontroller calculates k moment pre- number and changes leader will fhc(k):
The k moment, pre- number changed leader will fhc(k) error signal z is had recordedc(k) the k moment for the previous period in wave
Property feature, fhc(k)=1,0, -1, fhc(k)=1 error signal z is indicatedc(k) the k moment have for the previous period wave crest occur and
Crest value is met the requirements, fhc(k)=1 error signal z is indicatedc(k) there is trough appearance for the previous period at the k moment and valley value is full
Sufficient threshold requirement, fhc(k)=0 error signal z is indicatedc(k) trough is not met the requirements for the previous period at the k moment or wave crest goes out
It is existing；
7b microcontroller calculates k moment pre- number and changes tail tag will fec(k):
Wherein, th2 is preset threshold, th2=0.8；
The k moment, pre- number changed tail tag will fec(k) and k moment pre- number changes leader will fec(k) effect is similar, fec
(k)=1,0, -1, fhc(k)=1 error signal z is indicatedc(k) there is trough appearance for the previous period at the k moment and valley value meets
It is required that fhc(k)=1 error signal z is indicatedc(k) there is trough appearance for the previous period at the k moment and crest value meets threshold value and wants
It asks, fhc(k)=0 error signal z is indicatedc(k) trough is not met the requirements for the previous period at the k moment or wave crest occurs；
7c microcontroller calculates k moment each channel number and changes pc(k):
Work as fhc(k)=fec(k)=1 it when, indicates to have one section before the k moment while the waveform comprising wave crest, trough occurs,
The waveform wave crest is in preceding trough rear and meet constraint condition, and microcontroller determines the lift car channel into a people at this time；When
fhc(k)=fec(k)=- 1 it when, indicates to have one section before the k moment while the waveform comprising wave crest, trough occurs, the waveform trough
In preceding wave crest rear and meet constraint condition, microcontroller determines that the lift car channel goes out a people at this time；Work as fhc(k)=fec
(k)=0 when, indicate in k moment waveform stabilization for the previous period, at this time microcontroller determine lift car channel nobody into
Out；Work as fhc(k)≠fec(k) when, microcontroller determines lift car channel nobody disengaging；
7d microcontroller calculates total number of persons in k moment lift car and changes PNc(k):
Entire number variation detection process is exactly to utilize error signal state, pre- number variation leader will and the variation of pre- number
Tail tag will restores waveform of the error signal in the past period, by judging that waveform shape obtains the change of current channel number
Change, to finally obtain the total number of persons variation in lift car；
(8) microcontroller calculates number in k moment lift car:
Number in k-1 moment lift car is changed to obtain the k moment by microcontroller plus total number of persons in k moment lift car
Number in lift car.
Above description is only example of the present invention, does not constitute any limitation of the invention, it is clear that for
It, all may be without departing substantially from the principle of the invention, structure after having understood the content of present invention and principle for one of skill in the art
In the case where, various modifications and change in form and details are carried out, but the modifications and variations of these basic inventive ideas are still
Within the scope of the claims of the present invention.
Claims (3)
1. a kind of engineering elevator number detection method based on far-infrared technique, which is characterized in that be by engineering elevator number
What detection device was realized, which includes the cavity assembly (1) being mounted on above elevator cab door, the cavity assembly (1)
Including the first cavity (11), and the second cavity (12) for being connected and forming an angle with the first cavity (11) left and right side rear end
With third cavity (13), a far infrared is respectively installed in first cavity (11), the second cavity (12) and third cavity (13) and is passed
Sensor (2), the far-infrared sensor (2) perceive the far infrared that human body generates by the through slot being arranged on each cavity leading flank
Signal is simultaneously converted to electric signal；The trailing flank of first cavity (11), the second cavity (12) and third cavity (13) is adjacent
Position is provided with the 4th cavity (14), be equipped in the 4th cavity (14) including power circuit (31), filter amplification circuit (32),
The number measurement processor plate (3) of serial port module (33) and microprocessor (34), the power circuit (31), for far infrared
Sensor (2), serial port module (33) and microprocessor (34) provide operating voltage, the filter amplification circuit (32), for pair
The signal of far-infrared sensor (2) transmission is filtered and amplifies, and the serial port module (33) is used for person number detection device and sedan-chair
Connection communication between the safety monitoring system of compartment, the microprocessor (34) are described remote red for calculating number in lift car
Outer sensor (2) uses passive pyroelectric infrared sensor, should the engineering elevator number detection method based on far-infrared technique
Specifically comprise the following steps:
(1) passive pyroelectric infrared sensor is converted and is exported to the signal detected:
The far infrared signal detected in its detection zone is converted electric signal d by passive pyroelectric infrared sensorcAnd it is defeated
Out, wherein c expression passive pyroelectric infrared sensor label, c=1,2,3；
(2) filter amplification circuit is to dcIt is filtered and amplifies:
Filter amplification circuit is to dcIt is filtered, and filtered electric signal is amplified, the electric signal g amplifiedc；
(3) microprocessor calculates the error signal z of passive pyroelectric infrared sensorc(k):
(3a) microprocessor obtains k instance sample signal sc(k):
Microprocessor is to gcThe AD sampling of frequency is fixed, obtains k instance sample signal sc(k), k indicates sampling sequence number, k=
1,2,3…；
(3b) microprocessor is to sc(k) it is normalized, the digital signal r after being normalizedc(k):
rc(k)=λ sc(k)
Wherein, λ is normalized parameter；
(3c) microprocessor is to rc(k) it is filtered, and calculates the corresponding number of each passive pyroelectric infrared sensor after filtering
Word signal xc(k) mean value obtains mean value signal mc(k)；
(3d) microprocessor calculates the error signal y of each passive pyroelectric infrared sensorc(k), and to yc(k) width is carried out
Value transformation, the error signal z after obtaining amplitude transformationc(k), in which:
yc(k)=xc(k)-mc(k)
zc(k)=ρcyc(k)
Wherein, ρcFor error signal amplification coefficient；
(4) microprocessor calculates k moment error signal zc(k) maximum value Mxc(k) and minimum M nc(k)；
(5) microprocessor calculates k moment error signal state for time mark Tc(k):
Wherein, th0 is preset threshold；
(6) microprocessor calculates k moment error signal state Rsc(k):
Wherein, th1 and t is preset threshold；
(7) microprocessor calculates total number of persons variation PN in lift carc(k):
(7a) microprocessor calculates k moment pre- number and changes leader will fhc(k):
(7b) microprocessor calculates k moment pre- number and changes tail tag will fec(k):
Wherein, th2 is preset threshold；
(7c) microprocessor calculates k moment each channel number and changes pc(k):
(7d) microprocessor calculates total number of persons in k moment lift car and changes PNc(k):
(8) microprocessor calculates number in k moment lift car:
Number in k-1 moment lift car is changed to obtain k moment elevator by microprocessor plus total number of persons in k moment lift car
Number in carriage.
2. the engineering elevator number detection method according to claim 1 based on far-infrared technique, which is characterized in that step
The corresponding digital signal x of each passive pyroelectric infrared sensor after the filtering of calculating described in (3c)c(k) mean value, meter
Calculate formula are as follows:
Wherein, β is mean value computation parameter, and k indicates that sampling sequence number, k=1,2,3 ..., c indicate passive pyroelectric infrared sensor
Label, c=1,2,3, xc(k) the corresponding digital signal of each passive pyroelectric infrared sensor after filter for the k moment, calculating
Formula are as follows:
Wherein, α is filtering parameter, rc(k) digital signal after being normalized for the k moment.
3. the engineering elevator number detection method according to claim 1 based on far-infrared technique, which is characterized in that step
(4) the calculating k moment error signal z described inc(k) maximum value Mxc(k) and minimum M nc(k), calculation formula is respectively as follows:
Wherein, k expression sampling sequence number, k=1,2,3 ..., c expression passive pyroelectric infrared sensor label, c=1,2,3, zc
It (k) is the error signal of k moment passive pyroelectric infrared sensor.
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