CN117864891A - Non-invasive elevator system signal state detection device and method - Google Patents
Non-invasive elevator system signal state detection device and method Download PDFInfo
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Abstract
The present disclosure relates to a non-invasive elevator system signal state detection device and method, the device comprising: the system comprises an acquisition module, a preprocessing module, a signal processing module and a main control module, wherein the acquisition module is used for sensing a magnetic field generated by current of a signal wire of an elevator system and generating a sensing signal, the preprocessing module and the signal processing module are used for performing signal processing conversion, the main control module is used for obtaining a signal wire current value I_real, and the obtained signal wire current value I_real is subjected to quantization operation to obtain a signal state detection result. The method is realized by the device. The method and the device have the advantages of high feasibility and low implementation cost, can output quantized standard state signals at the front end, can reduce transmission bandwidth and processor resource occupation of gateway equipment of the Internet of things, and can further reduce installation and application cost.
Description
Technical Field
The disclosure relates to the technical field of elevator signal detection, in particular to a non-invasive elevator system signal state detection device and method.
Background
Along with the development of information technology, for perfecting the management of the whole life cycle of the elevator, such as paperless management, maintenance on demand and the like, the demands of the internet of things of the elevator are gradually increased, the life cycle of the elevator is generally longer, most of elevators which are put into use do not have the internet of things function, and the equipment of the external internet of things is required to provide the internet of things function. The realization of elevator internet of things function needs to detect elevator system signals, and the elevator system signal detection mode of the current mainstream has the following three types:
the first is that the internet of things equipment and an elevator main board (or a protocol conversion device) communicate and read signals, and the method adopts an open communication protocol to acquire elevator system signals, so that the method is only applicable to elevators with open interfaces or matched with protocol conversion;
the second is to obtain the state detection signal by accessing the elevator system, the method is easy to implement, but the safety of the elevator primary system is possibly damaged, the operation of the elevator is easily interfered, and the safety of the elevator operation process is reduced;
the third type of sensor with redundancy (independent of the elevator system) acquires signals, which significantly increases the number of components of the elevator system, is complex to implement, and is costly.
In summary, in the prior art, there is no simple and feasible method for monitoring the signal state of the elevator system, which does not need to access the inside of the elevator system and does not affect the original elevator system, and inconvenience is brought to the application process of the internet of things of the elevator.
Disclosure of Invention
In order to solve the above-mentioned problems of the prior art, the present disclosure is directed to a non-invasive elevator system signal state detection device and method. The method and the device have the advantages of high feasibility and low implementation cost, can output quantized standard state signals at the front end, can reduce transmission bandwidth and processor resource occupation of gateway equipment of the Internet of things, and can further reduce installation and application cost.
A non-invasive elevator system signal condition detection apparatus of the present disclosure, comprising:
the acquisition module is used for sensing a magnetic field generated by current of a signal wire of the elevator system and generating an induction signal;
the preprocessing module is in signal connection with the acquisition module and is used for modulating the induction signals into pulse signals and converting the pulse signals into differential signals;
the signal processing module is in signal connection with the signal processing module and is used for converting the differential signal into a single-ended pulse signal;
the main control module is in signal connection with the signal processing module and is used for demodulating the single-ended pulse signal to obtain a signal line current value I_real, and carrying out quantization operation on the obtained signal line current value I_real to obtain a signal state detection result;
performing quantization operation on the signal line current value I_real, and obtaining a signal state detection result comprises the following steps:
presetting a reference current value I_ref, an allowable deviation e and a delay time value T_del, wherein e epsilon (0, 1);
when the signal property of the signal line is normally closed, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied<(1-e) I_ref or I_real>(1+e) I_ref, and I_real<(1-e) I_ref or I_real>Duration t of (1+e) i_ref a1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd->Duration t of (2) a2 If the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal;
when the signal property of the signal line is normally open signalComparing the signal line current value I_real with the reference current value I_ref, if I_real is satisfied>e_ref, and i_real>Duration t of e_ref b1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd-> Duration t of (2) b2 And if the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal.
Preferably, the acquisition module comprises a transformer of amorphous soft magnetic material, the transformer being nested at the elevator system signal line for forming an induced magnetic field for the current in the elevator system signal line.
Preferably, the preprocessing module comprises an exciting circuit and a differential transmitting circuit which are connected in series, wherein the exciting circuit is used for carrying out single-coil modulation on the mutual inductor, coupling the formed induction magnetic field into exciting voltage to form a pulse signal, and the differential transmitting circuit is used for converting the formed pulse signal into a differential signal form for transmission.
Preferably, the signal processing module comprises a differential signal receiving circuit, and the differential signal receiving circuit is used for converting the differential signal output by the acquisition module into a single-ended pulse signal within the detection range of the main control module.
Preferably, the main control module comprises a pulse width capturing unit and a microprocessor, wherein the pulse width capturing unit is used for detecting the level of the obtained single-ended pulse signal to obtain the high-level duration T H And a low level duration T L The microprocessor is based on a high level duration T H And a low level duration T L And demodulating the signal line current value I_real based on a fluxgate duty cycle model.
Preferably, the microprocessor is responsive to a high level duration T H And a low level duration T L Demodulating the signal line current value I_real based on the fluxgate duty cycle model comprises the following steps:
calculating the duration T of the high level in one pulse period H And a low level duration T L Sum value T of per Absolute difference T dif ：
T per ＝T H +T L ；
T dif ＝|T H -T L |；
For the sum value T per Absolute difference T dif Samples were taken n consecutive times and the average was calculated:
wherein t represents sampling time, and n represents sampling window points;
according to the turns N of the mutual inductor in the acquisition module and the current sampling resistor R in the exciting circuit s Exciting voltage V h The compensation gain k is preset, and the signal line current value I_real is demodulated according to the following formula:
preferably, the elevator system signal state detection device further comprises an output module connected to the rear end of the main control module, and the output module comprises a digital quantity output port or an RS485 output port.
A method of non-intrusive elevator system signal condition detection of the present disclosure includes the steps of:
inducing a magnetic field generated by a current of a signal line of the elevator system and generating an induction signal;
modulating the induction signal into a pulse signal and converting the pulse signal into a differential signal;
converting the differential signal into a single-ended pulse signal;
demodulating the single-ended pulse signal to obtain a signal line current value I_real, and carrying out quantization operation on the obtained signal line current value I_real to obtain a signal state detection result;
performing quantization operation on the signal line current value I_real, and obtaining a signal state detection result comprises the following steps:
presetting a reference current value I_ref, an allowable deviation e and a delay time value T_del, wherein e epsilon (0, 1);
when the signal property of the signal line is normally closed, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied<(1-e) I_ref or I_real>(1+e) I_ref, and I_real<(1-e) I_ref or I_real>Duration t of (1+e) i_ref a1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd->Duration t of (2) a2 If the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal;
when the signal property of the signal line is a normally open signal, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied>e_ref, and i_real>Duration t of e_ref b1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd-> Duration t of (2) b2 And if the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal. The non-invasive elevator system signal state detection device and method disclosed by the disclosure have the advantages that:
1. according to the elevator system signal line current detection method, the current signal of the elevator system signal line is detected and obtained, the signal line current value is obtained by processing the current signal, and then the signal line current value is subjected to quantization operation to obtain a standard state detection result, so that communication with an elevator main board is not needed, the elevator system signal line current detection method is applicable to various elevators, the applicability is wide, an elevator internal system is not needed to be accessed, the elevator operation is prevented from being interfered, the elevator operation safety is guaranteed, various sensors are not needed to be additionally arranged, and the method is high in feasibility and low in implementation cost;
2. according to the method, the quantized standard state detection signals are output to superior equipment such as gateway equipment of the Internet of things and the like as detection results through the main control module, original signals are not directly output, the occupation of the state detection process on transmission bandwidth and resources of the gateway processor of the Internet of things can be remarkably reduced, the installation and application cost can be further reduced, and the state detection of various loops of an elevator system can be realized through a small number of superior equipment so as to realize comprehensive state detection of the elevator system.
Drawings
Fig. 1 is a schematic diagram of a non-invasive elevator system signal status detection device according to the present embodiment;
fig. 2 is a flow chart of state detection and judgment of the normally closed signal according to the present embodiment;
fig. 3 is a flowchart of the state detection and judgment of the normally open signal according to the present embodiment;
fig. 4 is a schematic view of an installation position of an embodiment 1 of an elevator system signal condition detection device of the present disclosure;
fig. 5 is a schematic view of the installation position of embodiment 2 of the signal state detection device of the elevator system of the present disclosure;
fig. 6 is a schematic view of the installation position of embodiment 3 of the signal state detection device of the elevator system of the present disclosure;
fig. 7 is a schematic view of an installation position of embodiment 4 of the elevator system signal condition detection device of the present disclosure;
fig. 8 is a circuit configuration diagram of the preprocessing module according to the present embodiment.
Reference numerals illustrate: the device comprises a 1-acquisition module, a 2-preprocessing module, a 3-signal processing module, a 4-main control module and a 5-output module.
Detailed Description
As shown in fig. 1, a non-invasive elevator system signal state detection device according to the present disclosure includes a collection module 1, a preprocessing module 2, a signal processing module 3, a main control module 4 and an output module 5, which are cascaded in sequence.
Specifically, the acquisition module 1 is used for sensing a magnetic field generated by current of a signal wire of the elevator system and generating an induction signal, and the preprocessing module 2 is used for preprocessing the current signal detected by the acquisition module 1 so as to convert the signal into a differential signal which can be stably transmitted and can be converted by the signal processing module 3 at the rear end. The signal processing module 3 processes the differential signal and converts the differential signal into a single-ended high-frequency pulse signal which can be detected and identified by the main control module 4. The main control module 4 processes the voltage signal to convert the voltage signal into a current value in a signal wire of the elevator system, namely a signal wire current value, and performs quantization operation on the signal wire current value to output a standard signal state detection result.
In a specific embodiment, the collection module 1, the preprocessing module 2 and the signal processing module 3 at the front end can be configured into a plurality of groups to form a plurality of collection loops, and the plurality of collection loops can share one main control module 4 and one output module 5 to realize synchronous state detection of different loops of the elevator system and reduce the number of the main control module 4 and the output module 5.
In a specific embodiment, the acquisition module 1 adopts a transformer made of amorphous soft magnetic material, the transformer is nested and arranged at a signal line of the elevator system, and weak current used for transmitting signals in the signal line of the elevator system forms a weak magnetic field on a magnetic core of the transformer.
The preprocessing module 2 comprises an exciting circuit and a differential transmitting circuit which are cascaded in sequence, the exciting circuit is used for coupling the formed induction magnetic field into exciting voltage to form a high-frequency pulse signal, namely PWM, through single-coil modulation of a mutual inductor, the differential transmitting circuit is used for converting the formed pulse signal into a differential signal form for transmission, and a mode of obtaining a signal wire signal through a high-frequency carrier modulation mode can be suitable for direct current or power frequency alternating current signals.
For example, as shown in fig. 8, in a specific circuit of the preprocessing module, the J2 connectors Pin2 and Pin3 are connected with a transformer of the acquisition module 1, the transformer, the comparator U2B, the exciting current sampling resistor R3, and the threshold voltage setting resistor R1R2 form a multivibrator, namely a basic self-oscillating fluxgate circuit, and the R4R5 is used for engineering protection. The front-end modulated pulse signal is converted into a differential signal by connecting the R6R7 to a U1 universal RS485 interface chip. The R9 configuration U1 general RS485 interface chip works in a transmitting mode. R11, R12, R13, R14 increase the differential signaling reliability effect.
The self-oscillation fluxgate circuit works in the following way:
under the condition that the transformer does not have primary side current, the comparator U2B Pin7 outputs high-level excitation voltage, a loop is formed by the R4, the R5 and the J2 and the excitation current sampling resistor R3, forward current is transmitted to the transformer of the acquisition module 1, the transformer shows inductance characteristic, the current is gradually increased, namely, the excitation current sampling resistor R3 obtains voltage value increase, when the voltage value on the R3 exceeds the threshold voltage set by the R1R2, the comparator U2B Pin7 overturns to output low-level excitation voltage, a loop is formed by the R4, the R5 and the J2 and the excitation current sampling resistor R3, reverse current is transmitted to the transformer of the acquisition module 1, the current value increase direction is opposite, namely, the excitation current sampling resistor R3 obtains voltage value reduction, when the voltage value on the R3 is lower than the threshold voltage set by the R1R2, the comparator U2B Pin7 outputs high-level excitation voltage in a turnover mode, and the duration of the high-level excitation voltage and the low-level excitation voltage are repeated. The detection signal line is overlapped with the action of the excitation voltage of the upper circuit by forming a magnetic field on the magnetic core through current, the duration of the excitation voltage of the high level (assumed to be the positive direction) is shortened when the detection signal line passes through the current in the positive direction, the duration of the excitation voltage of the low level is increased, and the opposite is carried out, namely the unbalance degree of the excitation voltage of the high level and the excitation voltage of the low level is related to the current linearity of the detection signal line.
The signal processing module 3 comprises a differential signal receiving circuit, and the differential signal receiving circuit is used for converting the differential signal output by the acquisition module into a single-ended high-frequency pulse signal positioned in the detection range of the main control module.
The main control module 4 mainly comprises a pulse width capturing unit and a microprocessor, wherein the pulse width capturing unit is used for detecting the level of the obtained single-ended pulse signal and obtaining the high-level duration time T H And a low level duration T L The microprocessor is based on a high level duration T H And a low level duration T L And demodulating the signal line current value I_real based on a fluxgate duty cycle model.
The microprocessor being responsive to the high level duration T H And a low level duration T L Demodulating the signal line current value I_real based on the fluxgate duty cycle model comprises the following steps:
calculating the duration T of the high level in one pulse period H And a low level duration T L Sum value T of per Absolute difference T dif ：
T per ＝T H +T L ；
T dif ＝|T H -T L |；
For the sum value T per Absolute difference T dif Samples were taken n consecutive times and the average was calculated:
wherein t represents sampling time, and n represents sampling window points;
according to the turns N of the mutual inductor in the acquisition module and the current sampling resistor R in the exciting circuit s Exciting voltage V h The compensation gain k is preset, and the signal line current value I_real is demodulated according to the following formula:
the signal line current value I_real is obtained through calculation in the steps, and then the signal line current value I_real is quantized, so that a signal state detection result is obtained, and the specific process of the quantization is as follows:
presetting a reference current value I_ref, an allowable deviation e and a delay time value T_del, wherein e epsilon (0, 1);
as shown in FIG. 2, when the signal property of the signal line is a normally closed signal, the signal line current value I_real is compared with the reference current value I_ref, if I_real is satisfied<(1-e) I_ref or I_real>(1+e) I_ref, and I_real<(1-e) I_ref or I_real>Duration t of (1+e) i_ref a1 If the output state detection result is greater than the delay time value T_del, outputting a state detection result as abnormal (S=1), otherwise outputting a state detection result as normal (S=0); if the output state detection result is abnormal, if the condition is satisfied And is also provided withDuration t of (2) a2 Greater than the delay time value t_del, updating the output state detection result to be normal (s=0);
as shown in fig. 3, when the signal property of the signal line is a normally open signal, the signal line current value i_real is compared with the reference current value i_ref, if i_real is satisfied>e_ref, and i_real>Duration t of e_ref b1 If the output state detection result is greater than the delay time value T_del, outputting a state detection result as abnormal (S=1), otherwise outputting a state detection result as normal (S=0); if the output state detection result is abnormal, if the condition is satisfiedAnd is also provided withDuration t of (2) b2 And if the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal.
The output module 5 comprises a digital quantity output port or an RS485 output port and outputs the detection result.
The practical application of the elevator system signal state detection device of the present embodiment will be described below with reference to specific application examples.
Example 1
As shown in fig. 4, the safety circuit of the elevator includes a car top emergency stop button, an in-car emergency stop button, a safety window switch, a safety clamp switch, a speed limiter switch, an upper limit switch, other safety components, and a cabinet emergency stop button, which are sequentially connected in series from left to right, when any safety component in the series circuit is abnormal, the circuit is changed from a closed state to an open state, the signal state detection device of the elevator system of the embodiment is connected to a signal connection line between the car top emergency stop button and the in-car emergency stop button at the front end, that is, a signal connection line in which a transformer is nested is installed, or between the other safety components at the rear end and the cabinet emergency stop button, the signal attribute of the circuit is configured as a normally closed signal, and when one safety component in the elevator is abnormal, the safety circuit is changed to an open state, at this time, the current of the signal line of the elevator is close to 0mA, the detected current value of the signal line is continuously less than 80% of the reference current value, that is 24mA, the time exceeds the allowable deviation by 0.5S, and the detected result is output in the state of the abnormal state=0.5S.
Example 2
As in the elevator car door loop shown in fig. 5, the elevator car door loop is a series signal detection loop including a car door lock switch, and the elevator system is used to detect the car door open and closed condition. The door loop is in an open state when the elevator car door is open and in a closed state when the elevator car door is closed. The mutual inductor in the signal detection device of the elevator system can be nested and arranged at the front end or the rear end of the car door lock switch in the loop, the signal detection device is correspondingly provided with a normally closed signal of the car door loop, and the reference current value is 20mA, the allowable deviation is 20% and the delay time value is 0.3s. When the elevator car door is opened, the car door loop is in an open state, the elevator signal line current is close to 0mA, the detected signal current is continuously smaller than 80% of the reference current value, namely 16mA, the duration exceeds the delay time value by 0.3S, and the elevator system signal detection device outputs a car door opening abnormal signal (S=1).
Example 3
As in the elevator service loop shown in fig. 6, the elevator service loop is a series signal detection loop including service switches, and the elevator system is used to detect the service switch status. When the overhaul switch is pressed down and the overhaul loop is in an open state and the overhaul switch is loosened, the overhaul loop is in a closed state. The transformer in the signal detection device of the elevator system according to the embodiment can be installed in a loop in a nested manner and is connected to the signal line of the elevator control board, and the signal detection device is correspondingly provided with a normally closed signal of the signal property of the inspection loop, a reference current value of 10mA, an allowable deviation of 20% and a delay time value of 0.5s. When the elevator maintenance switch is pressed down, the maintenance loop is in an open circuit state, at the moment, the elevator signal line current is close to 0mA, the detected signal current is continuously smaller than 80% of the reference current value, namely 8mA, the duration exceeds the delay time value by 0.5S, and the elevator system signal detection device outputs an abnormal maintenance loop signal (S=1).
Example 4
As shown in fig. 7, the elevator alarm button is a switching device on a trigger signal loop of an elevator intercom system, and pressing the alarm button forms a path on the trigger signal loop, so that the elevator system is used for triggering the intercom system to carry out intercom. When the alarm button is pressed, a channel current is formed on the trigger signal loop. The mutual inductor in the elevator system signal detection device of the embodiment can be nested and arranged on the signal connection line between the alarm button and the car intercom system, the alarm button signal attribute is configured to be a normally open signal correspondingly in the signal detection device, and the reference current value is configured to be 5mA, the allowable deviation is configured to be 20%, and the delay time value is configured to be 0.5s. When the elevator alarm button is pressed, a channel current is formed on a trigger signal loop of the intercom system, at the moment, the elevator signal line current is larger than 1mA, the detected signal current is continuously larger than 20% of a reference current value, namely 1mA, the duration exceeds a delay time value for 0.5S, and the elevator system signal detection device outputs an alarm button abnormal signal (S=1).
According to the elevator system signal line current detection method, the current signal of the elevator system signal line is detected and obtained, the signal line current value is obtained by processing the current signal, and then the signal line current value is subjected to quantization operation to obtain a standard state detection result, so that communication with an elevator main board is not needed, the elevator system signal line current detection method is applicable to various elevators, the applicability is wide, an elevator internal system is not needed to be accessed, the elevator operation is prevented from being interfered, the elevator operation safety is guaranteed, various sensors are not needed to be additionally arranged, and the method is high in feasibility and low in implementation cost;
according to the method, the current value of the signal line is quantized through the main control module 4, the quantized standard state detection signal is output to superior equipment such as gateway equipment of the Internet of things and the like as a detection result, the original signal is not directly output, the occupation of the state detection process on the transmission bandwidth and the resources of the gateway processor of the Internet of things can be remarkably reduced, the installation and application cost can be further reduced, and the state detection of various loops of the elevator system can be realized through a small number of superior equipment so as to realize the comprehensive state detection of the elevator system.
The embodiment also provides a non-invasive elevator system signal state detection method, which comprises the following steps:
inducing a magnetic field generated by a current of a signal line of the elevator system and generating an induction signal;
modulating the induction signal into a pulse signal and converting the pulse signal into a differential signal;
converting the differential signal into a single-ended pulse signal;
demodulating the single-ended pulse signal to obtain a signal line current value I_real, and carrying out quantization operation on the obtained signal line current value I_real to obtain a signal state detection result;
performing quantization operation on the signal line current value I_real, and obtaining a signal state detection result comprises the following steps:
presetting a reference current value I_ref, an allowable deviation e and a delay time value T_del, wherein e epsilon (0, 1);
when the signal property of the signal line is normally closed, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied<(1-e) I_ref or I_real>(1+e) I_ref, and I_real<(1-e) I_ref or I_real>Duration t of (1+e) i_ref a1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd->Duration t of (2) a2 If the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal;
when the signal property of the signal line is a normally open signal, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied>e_ref, and i_real>Duration t of e_ref b1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd-> Duration t of (2) b2 And if the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal.
The method for detecting the signal state of the elevator system according to this embodiment and the apparatus for detecting the signal state of the elevator system described above are based on the same inventive concept, and can be understood with reference to the above description, and will not be described in detail herein.
In the description of the present disclosure, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and simplify the description, and without being otherwise described, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be configured and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present disclosure.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the claims.
Claims (8)
1. A non-intrusive elevator system signal condition detection device, comprising:
the acquisition module is used for sensing a magnetic field generated by current of a signal wire of the elevator system and generating an induction signal;
the preprocessing module is in signal connection with the acquisition module and is used for modulating the induction signals into pulse signals and converting the pulse signals into differential signals;
the signal processing module is in signal connection with the signal processing module and is used for converting the differential signal into a single-ended pulse signal;
the main control module is in signal connection with the signal processing module and is used for demodulating the single-ended pulse signal to obtain a signal line current value I_real, and carrying out quantization operation on the obtained signal line current value I_real to obtain a signal state detection result;
performing quantization operation on the signal line current value I_real, and obtaining a signal state detection result comprises the following steps:
presetting a reference current value I_ref, an allowable deviation e and a delay time value T_del, wherein e epsilon (0, 1);
when the signal property of the signal line is normally closed, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied<(1-e) I_ref or I_real>(1+e) I_ref, and I_real<(1-e) I_ref or I_real>Duration t of (1+e) i_ref a1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd->Duration t of (2) a2 If the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal;
when the signal property of the signal line is a normally open signal, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied>e_ref, and i_real>Duration t of e_ref b1 Greater than the delay time value T_del, thenOutputting the abnormal state detection result, otherwise outputting the normal state detection result; if the output state detection result is abnormal, if the condition is satisfiedAnd->Duration t of (2) b2 And if the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal.
2. The non-invasive elevator system signal status detection apparatus of claim 1, wherein the collection module comprises a transformer of amorphous soft magnetic material nested at the elevator system signal line for forming an induced magnetic field for current in the elevator system signal line.
3. The non-invasive elevator system signal state detecting apparatus according to claim 2, wherein the preprocessing module includes an exciting circuit for single-coil modulating the transformer, coupling the formed induced magnetic field into an excitation voltage to form a pulse signal, and a differential transmitting circuit for converting the formed pulse signal into a differential signal for transmission.
4. The apparatus of claim 3, wherein the signal processing module comprises a differential signal receiving circuit for converting the differential signal output by the acquisition module into a single-ended pulse signal within the detection range of the main control module.
5. The non-invasive elevator system signal status detection apparatus according to claim 4, wherein the main control module comprises a pulse width capturing unit and a microprocessor, the main control module comprisingThe pulse width capturing unit is used for detecting the level of the obtained single-ended pulse signal to obtain the high-level duration time T H And a low level duration T L The microprocessor is based on a high level duration T H And a low level duration T L And demodulating the signal line current value I_real based on a fluxgate duty cycle model.
6. The non-invasive elevator system signal status detecting apparatus according to claim 5, wherein said microprocessor is responsive to a high level duration T H And a low level duration T L Demodulating the signal line current value I_real based on the fluxgate duty cycle model comprises the following steps:
calculating the duration T of the high level in one pulse period H And a low level duration T L Sum value T of per Absolute difference T dif ：
T per ＝T H +T L ；
T dif ＝|T H -T L |；
For the sum value T per Absolute difference T dif Samples were taken n consecutive times and the average was calculated:
wherein t represents sampling time, and n represents sampling window points;
according to the turns N of the mutual inductor in the acquisition module and the current sampling resistor R in the exciting circuit s Exciting voltage V h The compensation gain k is preset, and the signal line current value I_real is demodulated according to the following formula:
7. the non-invasive elevator system signal status detection apparatus according to claim 1, further comprising an output module connected to a rear end of the main control module, wherein the output module comprises a digital output port or an RS485 output port.
8. A method for non-intrusive elevator system signal condition detection, comprising the steps of:
inducing a magnetic field generated by a current of a signal line of the elevator system and generating an induction signal;
modulating the induction signal into a pulse signal and converting the pulse signal into a differential signal;
converting the differential signal into a single-ended pulse signal;
demodulating the single-ended pulse signal to obtain a signal line current value I_real, and carrying out quantization operation on the obtained signal line current value I_real to obtain a signal state detection result;
performing quantization operation on the signal line current value I_real, and obtaining a signal state detection result comprises the following steps:
presetting a reference current value I_ref, an allowable deviation e and a delay time value T_del, wherein e epsilon (0, 1);
when the signal property of the signal line is normally closed, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied<(1-e) I_ref or I_real>(1+e) I_ref, and I_real<(1-e) I_ref or I_real>Duration t of (1+e) i_ref a1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd->Duration t of (2) a2 If the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal;
when the signal property of the signal line is a normally open signal, comparing the current value I_real of the signal line with the reference current value I_ref, if I_real is satisfied>e_ref, and i_real>Duration t of e_ref b1 If the output state detection result is larger than the delay time value T_del, the output state detection result is abnormal, otherwise, the output state detection result is normal; if the output state detection result is abnormal, if the condition is satisfiedAnd-> Duration t of (2) b2 And if the output state detection result is larger than the delay time value T_del, updating the output state detection result to be normal.
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