Smart axle detector and monitoring system for spoke wheel sensors

Abstract

The application discloses a kind of for spoke wheel sensor intelligent axle detector and monitoring system, axle detector includes first wheel detection module, second wheel detection module and FSK modulation module, and also include first acquisition module, second acquisition module and main control module;First acquisition module is used to collect the characteristic parameter of first wheel detection module, and the characteristic parameter of first wheel detection module collected is sent to main control module;Second acquisition module is used to collect the characteristic parameter of second wheel detection module, and the characteristic parameter of second wheel detection module collected is sent to main control module;Characteristic parameter includes amplitude parameter, phase difference parameter and frequency parameter;Main control module is used to compare each characteristic parameter sent by first acquisition module and second acquisition module with the preset reference value corresponding to the characteristic parameter, and monitoring information is generated after comparison.The axle detector with board-level monitoring function is realized in the application.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of rail transit, and particularly relates to an intelligent wheel axle detector and monitoring system for spoke wheel sensors. BACKGROUND

[0002] The axle counting equipment is currently widely used in the fields of national railways, local railways, urban rails, straddle-type monorails, cloud rails and suspended air rails. The axle counting equipment includes indoor equipment and outdoor equipment, and is used for detecting the occupied / idle state of an axle counting section in real time. The wheel is detected through a sensor in the outdoor equipment, and then the wheel detection result is transmitted to the axle counting host in the indoor equipment through a cable line. The axle counting host calculates the axle number recorded when a train enters or exits the axle counting point of the rail section, so as to determine whether the axle counting section is in an occupied state or an idle state. The sensor in the outdoor equipment currently widely uses a spoke wheel sensor, which has the advantages of strong anti-interference performance and long effective detection distance. The spoke wheel sensor cooperates with the wheel axle detector to complete the detection of the train wheel.

[0003] As shown in Figure 1 , the use mode of the traditional wheel axle detector is as follows: it is placed on the trackside, and the cables of the first receiving magnetic head 1, the first transmitting magnetic head 2, the second receiving magnetic head 3 and the second transmitting magnetic head 4 are connected to the wheel axle detector 5 through the wiring terminals. The first receiving magnetic head 1 and the first transmitting magnetic head 2 form the first group of magnetic heads, and the second receiving magnetic head 3 and the second transmitting magnetic head 4 form the second group of magnetic heads, and the two groups of magnetic heads jointly realize the judgment of the train direction. Figure 2 and Figure 3 , the traditional wheel axle detector generally includes two groups of wheel detection modules and FSK modulation modules at the board end. One group of wheel detection modules is used for connecting with the first transmitting magnetic head 2 and the first receiving magnetic head 1 respectively, and the other group of wheel detection modules is used for connecting with the second transmitting magnetic head 4 and the second receiving magnetic head 3 respectively. The circuit structures in the two groups of wheel detection modules are the same, except that the working frequencies are different. Both of them include a power supply circuit, a transmitting signal generating circuit, a transmitting signal amplifying circuit, a receiving signal amplifying circuit, a receiving signal phase discriminating circuit, a receiving signal filtering circuit and a receiving signal amplitude discriminating circuit, etc. When the axle counting equipment is normally working and there is no wheel above the magnetic head, both of the two wheel detection modules output high level. When there is a wheel above the magnetic head, both of the two wheel detection modules output low level. The order of the level edge jump of the outputs of the two wheel detection modules can determine the direction of the train running.

[0004] However, the traditional wheel axle detector can only cooperate with the spoke wheel sensor to detect the wheel and does not have monitoring capability. In the actual application of the axle counting device, once the axle counting device fails, due to the lack of effective outdoor device monitoring means, the fault point cannot be accurately located, and at the same time, due to the particularity of the use environment of the outdoor device, various types of faults occur, including axis loss caused by improper installation of the magnetic head, power supply abnormality caused by outdoor bad weather, and electrical parameter faults or electrical parameter drift caused by temperature, humidity and device aging of each electrical module of the wheel axle detector, etc., thereby greatly increasing the difficulty of daily maintenance, fault troubleshooting and fault handling time, and affecting the normal operation of the railway. On the other hand, the wheel axle detector is usually several hundred meters to several kilometers away from the axle counting host, and if outdoor monitoring equipment is added to complete the monitoring of the outdoor equipment, optical / electrical cables need to be laid for the monitoring equipment, which has high laying cost.

[0005] Therefore, it is urgent to improve the performance of the existing outdoor equipment and increase the board-level monitoring capability, and it is also a technical problem to be solved how to transmit the board-end monitoring information to the indoor equipment at the lowest cost. SUMMARY

[0006] The purpose of the present application is to overcome one or more deficiencies of the prior art and provide an intelligent wheel axle detector for a spoke wheel sensor and a monitoring system.

[0007] The purpose of the present application is achieved by the following technical solutions:

[0008] First part

[0009] The first part of the present application provides an intelligent wheel axle detector for a spoke wheel sensor, which comprises a first wheel detection module, a second wheel detection module and an FSK modulation module, a first end of the first wheel detection module is used for connecting with an external first transmitting magnetic head, a second end of the first wheel detection module is used for connecting with an external first receiving magnetic head, a third end of the first wheel detection module is connected with a first end of the FSK modulation module, a first end of the second wheel detection module is used for connecting with an external second transmitting magnetic head, a second end of the second wheel detection module is used for connecting with an external second receiving magnetic head, a third end of the second wheel detection module is connected with a second end of the FSK modulation module, and a third end of the FSK modulation module is used for being in communication connection with an external axle counting host through an FSK signal transmission line;

[0010] The wheel axle detector further comprises a first acquisition module, a second acquisition module and a master control module;

[0011] The first acquisition module is configured to acquire characteristic parameters of the first wheel detection module and send the acquired characteristic parameters of the first wheel detection module to the main control module.

[0012] The second acquisition module is configured to acquire characteristic parameters of the second wheel detection module and send the acquired characteristic parameters of the second wheel detection module to the main control module.

[0013] The characteristic parameters include amplitude parameters, phase difference parameters and frequency parameters.

[0014] The main control module is configured to compare each characteristic parameter sent by the first acquisition module and the second acquisition module with a preset reference value corresponding to the characteristic parameter, and generate monitoring information after the comparison.

[0015] Preferably, the wheel axle detector further comprises a PLC sending module and a PLC receiving module, the PLC sending module is connected with the main control module, the PLC sending module is further connected with the PLC receiving module through the FSK signal transmission line, and the PLC receiving module is configured to be connected with an external host computer.

[0016] The PLC sending module is configured to receive the monitoring information sent by the main control module, modulate the monitoring information with a carrier wave, and then couple the modulated monitoring information to the FSK signal transmission line.

[0017] The PLC receiving module is configured to decouple the modulated monitoring information from the FSK signal transmission line, demodulate the modulated monitoring information, and then send the demodulated monitoring information to the external host computer.

[0018] Preferably, the first acquisition module comprises a first acquisition circuit, a second acquisition circuit, a third acquisition circuit, a fourth acquisition circuit, a fifth acquisition circuit, a sixth acquisition circuit and a seventh acquisition circuit.

[0019] The first acquisition circuit is configured to acquire a first amplitude parameter of an output voltage of a power supply circuit in the first wheel detection module and send the acquired first amplitude parameter to the main control module.

[0020] The second acquisition circuit is configured to acquire a first frequency parameter of an output signal of a signal generation circuit in the first wheel detection module and send the acquired first frequency parameter to the main control module.

[0021] The third acquisition circuit is configured to acquire a second amplitude parameter and a second frequency parameter of an output signal of a signal amplification circuit in the first wheel detection module and send the acquired second amplitude parameter and the second frequency parameter to the main control module.

[0022] The fourth acquisition circuit is used for acquiring a third amplitude parameter and a third frequency parameter of an output signal of a receiving signal amplification circuit in the first wheel detection module, and sending the acquired third amplitude parameter and third frequency parameter to the master control module;

[0023] The fifth acquisition circuit is used for acquiring a first phase difference parameter of a phase difference signal output by a receiving signal phase detection circuit in the first wheel detection module, and sending the acquired first phase difference parameter to the master control module;

[0024] The sixth acquisition circuit is used for acquiring a fourth amplitude parameter of a direct current signal output by a receiving signal filtering circuit in the first wheel detection module, and sending the acquired fourth amplitude parameter to the master control module;

[0025] The seventh acquisition circuit is used for acquiring a fifth amplitude parameter of a digital pulse signal output by a receiving signal amplitude detection circuit in the first wheel detection module, and sending the acquired fifth amplitude parameter to the master control module.

[0026] Preferably, the second acquisition module comprises an eighth acquisition circuit, a ninth acquisition circuit, a tenth acquisition circuit, an eleventh acquisition circuit, a twelfth acquisition circuit, a thirteenth acquisition circuit and a fourteenth acquisition circuit, the first acquisition circuit and the eighth acquisition circuit are of the same structure, the second acquisition circuit and the ninth acquisition circuit are of the same structure, the third acquisition circuit and the tenth acquisition circuit are of the same structure, the fourth acquisition circuit and the eleventh acquisition circuit are of the same structure, the fifth acquisition circuit and the twelfth acquisition circuit are of the same structure, the sixth acquisition circuit and the thirteenth acquisition circuit are of the same structure, and the seventh acquisition circuit and the fourteenth acquisition circuit are of the same structure;

[0027] The eighth acquisition circuit is used for acquiring a sixth amplitude parameter of an output voltage of a power supply circuit in the second wheel detection module, and sending the acquired sixth amplitude parameter to the master control module;

[0028] The ninth acquisition circuit is used for acquiring a fourth frequency parameter of an output signal of a transmitting signal generation circuit in the second wheel detection module, and sending the acquired fourth frequency parameter to the master control module;

[0029] The tenth acquisition circuit is used for acquiring a seventh amplitude parameter and a fifth frequency parameter of an output signal of a transmitting signal amplification circuit in the second wheel detection module, and sending the acquired seventh amplitude parameter and fifth frequency parameter to the master control module;

[0030] The eleventh acquisition circuit is used for acquiring an eighth amplitude parameter and a sixth frequency parameter of an output signal of a receiving signal amplification circuit in the second wheel detection module, and sending the acquired eighth amplitude parameter and sixth frequency parameter to the master control module;

[0031] The twelfth acquisition circuit is configured to acquire a second phase difference parameter of a phase difference signal output by a received signal phase discriminator in the second wheel detection module, and send the acquired second phase difference parameter to the main control module.

[0032] The thirteenth acquisition circuit is configured to acquire a ninth amplitude parameter of a direct current signal output by a received signal filter in the second wheel detection module, and send the acquired ninth amplitude parameter to the main control module.

[0033] The fourteenth acquisition circuit is configured to acquire a tenth amplitude parameter of a digital pulse signal output by an amplitude discriminator in the second wheel detection module, and send the acquired tenth amplitude parameter to the main control module.

[0034] Preferably, the wheel axle detector further comprises a calibration switch and a fifteenth acquisition circuit.

[0035] The fifteenth acquisition circuit is configured to generate a first level signal when the calibration switch is turned on, and send the first level signal to the main control module.

[0036] The main control module takes the characteristic parameter acquired at the current time when the first level signal arrives as the preset reference value corresponding to the characteristic parameter.

[0037] Preferably, the PLC sending module comprises a first microprocessor, a first carrier wave modulation and demodulation circuit, and a first transmission line coupling circuit, the first microprocessor is connected with the main control module and the first carrier wave modulation and demodulation circuit respectively, and the first transmission line coupling circuit is connected with the first carrier wave modulation and demodulation circuit and the FSK signal transmission line respectively.

[0038] The PLC receiving module comprises a second microprocessor, a second carrier wave modulation and demodulation circuit, and a second transmission line coupling circuit, the second microprocessor is connected with the second carrier wave modulation and demodulation circuit, the second microprocessor is further configured to be connected with an external host computer, and the second transmission line coupling circuit is connected with the second carrier wave modulation and demodulation circuit and the FSK signal transmission line respectively.

[0039] Preferably, the first acquisition circuit comprises a first isolation type operational amplifier, an output end of a power supply circuit in the first wheel detection module is connected with an input end of the first isolation type operational amplifier, and an output end of the first isolation type operational amplifier is connected with a first ADC end of the main control module.

[0040] The third acquisition circuit comprises a second isolation type operational amplifier, an output end of a transmitted signal amplification circuit in the first wheel detection module is connected with an input end of the second isolation type operational amplifier, and an output end of the second isolation type operational amplifier is connected with a second ADC end of the main control module.

[0041] The fourth acquisition circuit comprises a third isolation type operational amplifier, an output end of the receiving signal amplification circuit in the first wheel detection module is connected with an input end of the third isolation type operational amplifier, and an output end of the third isolation type operational amplifier is connected with a third ADC end of the master control module.

[0042] The sixth acquisition circuit comprises a fourth isolation type operational amplifier, an output end of the receiving signal filtering circuit in the first wheel detection module is connected with an input end of the fourth isolation type operational amplifier, and an output end of the fourth isolation type operational amplifier is connected with a fourth ADC end of the master control module.

[0043] Preferably, the first acquisition module and the second acquisition module are compared with the preset reference value corresponding to each feature parameter, and monitoring information is generated after comparison, and the specific process is as follows:

[0044] If the absolute value of the difference between the fifth amplitude parameter and the preset reference value corresponding to the fifth amplitude parameter is less than the first threshold value, monitoring information representing that the fifth amplitude parameter is a high level is generated;

[0045] If the preset reference value corresponding to the fifth amplitude parameter is greater than the fifth amplitude parameter, and the difference between the fifth amplitude parameter is greater than the second threshold value, monitoring information representing that the fifth amplitude parameter is a low level is generated;

[0046] If the absolute value of the difference between the tenth amplitude parameter and the preset reference value corresponding to the tenth amplitude parameter is less than the third threshold value, monitoring information representing that the tenth amplitude parameter is a high level is generated;

[0047] If the preset reference value corresponding to the tenth amplitude parameter is greater than the tenth amplitude parameter, and the difference between the tenth amplitude parameter is greater than the fourth threshold value, monitoring information representing that the tenth amplitude parameter is a low level is generated;

[0048] Whether the absolute value of the difference between the remaining feature parameters except the fifth amplitude parameter and the tenth amplitude parameter and the preset reference value corresponding to the feature parameter is greater than the preset threshold value corresponding to the feature parameter is judged respectively, if yes, monitoring information representing that the feature parameter is abnormal is generated, otherwise, monitoring information representing that the feature parameter is normal is generated;

[0049] Wherein, the second threshold value is greater than the first threshold value, and the fourth threshold value is greater than the third threshold value.

[0050] The beneficial effects of the first part of the application are:

[0051] (1) through the first acquisition module to the first wheel detection module in the electric module amplitude, frequency and phase difference parameter sampling, through the second acquisition module to the second wheel detection module in the electric module amplitude, frequency and phase difference parameter sampling, realized the wheel axle detector itself board level monitoring ability, combined with the main control module for parameter analysis, calculation and judgment, then generate can be used by the host computer monitoring information;

[0052] According to the monitoring information can determine the output signal of each electric module drift, if the drift, early warning, operation and maintenance personnel can check the axle equipment, so as to eliminate hidden trouble before failure, ensure the long-term stable operation of the equipment;

[0053] According to the monitoring information can estimate the specific fault point of wheel axle detector board, operation and maintenance personnel can quickly and accurately locate the fault point, so as to reduce the fault handling time, reduce the work difficulty and workload of operation and maintenance personnel.

[0054] (2), through the PLC (power carrier) sending module and PLC receiving module to the original FSK signal transmission line after the monitoring information is modulated and coupled to realize the transmission of monitoring information to the indoor host computer, which saves the cable core and reduces the construction cost in the monitoring function upgrading project of the existing axle equipment.

[0055] (3), even if the same type of wheel axle detector, the internal use of electronic components also exist some differences, at the same time, the installation size of the two groups of magnetic head connected by the wheel axle detector can not be absolutely consistent, so the internal electric module output of the same type of wheel axle detector or different type of wheel axle detector also exists certain difference, the wheel axle detector realized by the embodiment of the application through the setting of the calibration switch and the fifteenth acquisition circuit, after the wheel axle detector is installed, press the calibration switch, the current output value of each electric module collected by the wheel axle detector at this time is taken as the preset reference value for parameter drift calculation, this kind of differential setting for preset reference value improves the accuracy of the monitoring information generated by the wheel axle detector.

[0056] (4), when collecting the analog part in the characteristic parameter, isolation type operational amplifier is added in the first acquisition circuit, eighth acquisition circuit, third acquisition circuit, tenth acquisition circuit, fourth acquisition circuit, eleventh acquisition circuit, sixth acquisition circuit and thirteenth acquisition circuit, which avoids the interference to the original analog output of the electric module, and ensures the wheel axle detection performance of the wheel axle detector.

[0057] Second part

[0058] The second part of the present application provides a monitoring system, comprising the smart wheel detector for the spoke wheel sensor provided by the first part of the present application and the host computer, wherein the wheel detector and the host computer are in communication connection, and the wheel detector is further used for being in communication connection with the external axle counting host computer;

[0059] The host computer is used for estimating the fault points of the wheel detector, the first transmitting magnetic head, the second transmitting magnetic head, the first receiving magnetic head and the second receiving magnetic head according to the monitoring information when the axle counting host computer determines that the wheel detection state is abnormal and there is no wheel above the first transmitting magnetic head, the second transmitting magnetic head, the first receiving magnetic head and the second receiving magnetic head, and is used for performing the abnormal warning of the characteristic parameters according to the monitoring information.

[0060] Preferably, the specific process of estimating the fault points of the wheel detector, the first transmitting magnetic head, the second transmitting magnetic head, the first receiving magnetic head and the second receiving magnetic head according to the monitoring information is as follows:

[0061] If the monitoring information represents that the fifth amplitude parameter is high level and the tenth amplitude parameter is high level, it is determined that the FSK modulation module is a fault point;

[0062] If the monitoring information represents that the fifth amplitude parameter is low level, the first wheel detection module fault estimation step is performed;

[0063] If the monitoring information represents that the tenth amplitude parameter is low level, the second wheel detection module fault estimation step is performed;

[0064] The first wheel detection module fault estimation step is specifically as follows:

[0065] S01, if the monitoring information represents that the fourth amplitude parameter is normal, it is estimated that the received signal amplitude discrimination circuit in the first wheel detection module is a fault point, otherwise the next step is performed;

[0066] S02, if the monitoring information represents that the first phase difference parameter is normal, it is estimated that the received signal filtering circuit in the first wheel detection module is a fault point, otherwise the next step is performed;

[0067] S03, if the monitoring information represents that the third amplitude parameter and the third frequency parameter are both normal, it is estimated that the received signal phase discrimination circuit in the first wheel detection module is a fault point, otherwise the next step is performed;

[0068] S04, if the monitoring information represents that the second amplitude parameter and the second frequency parameter are both normal, it is estimated that the received signal amplification circuit or the first receiving magnetic head or the first transmitting magnetic head in the first wheel detection module is a fault point, otherwise the next step is performed;

[0069] S05, if the monitoring information represents that the first frequency parameter is normal, then the first wheel detection module's transmitting signal amplification circuit is estimated as the fault point, otherwise the next step is executed;

[0070] S06, if the monitoring information represents that the first amplitude parameter is normal, then the first wheel detection module's transmitting signal generation circuit is estimated as the fault point, otherwise the first wheel detection module's power supply circuit is estimated as the fault point;

[0071] The second wheel detection module fault estimation step is specifically:

[0072] S001, if the monitoring information represents that the ninth amplitude parameter is normal, then the second wheel detection module's receiving signal amplitude judging circuit is estimated as the fault point, otherwise the next step is executed;

[0073] S002, if the monitoring information represents that the second phase difference parameter is normal, then the second wheel detection module's receiving signal filtering circuit is estimated as the fault point, otherwise the next step is executed;

[0074] S003, if the monitoring information represents that the eighth amplitude parameter and the sixth frequency parameter are normal, then the second wheel detection module's receiving signal phase judging circuit is estimated as the fault point, otherwise the next step is executed;

[0075] S004, if the monitoring information represents that the seventh amplitude parameter and the fifth frequency parameter are normal, then the second wheel detection module's receiving signal amplification circuit or the second receiving magnetic head or the second transmitting magnetic head is estimated as the fault point, otherwise the next step is executed;

[0076] S005, if the monitoring information represents that the fourth frequency parameter is normal, then the second wheel detection module's transmitting signal amplification circuit is estimated as the fault point, otherwise the next step is executed;

[0077] S006, if the monitoring information represents that the sixth amplitude parameter is normal, then the second wheel detection module's transmitting signal generation circuit is estimated as the fault point, otherwise the second wheel detection module's power supply circuit is estimated as the fault point.

[0078] The second part brings the same beneficial effects as the first part, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0079] Figure 1 It is an installation schematic diagram for the conventional wheelset detector mentioned in the background art;

[0080] Figure 2 It is a composition block diagram of the conventional wheelset detector mentioned in the background art;

[0081] Figure 3 It is a composition block diagram of the first wheel detection module mentioned in the background art;

[0082] Figure 4 The first acquisition module of the smart axle detector corresponding to the first embodiment is connected with the main control module and the first wheel detection module.

[0083] Figure 5 The second acquisition module of the smart axle detector corresponding to the first embodiment is connected with the main control module and the second wheel detection module.

[0084] Figure 6 An exemplary diagram of the connection of the main control module, the PLC sending module and the PLC receiving module.

[0085] Figure 7 A block diagram of the PLC sending module.

[0086] Figure 8 A first part of the schematic diagram of the first acquisition circuit.

[0087] Figure 9 A second part of the schematic diagram of the first acquisition circuit.

[0088] Figure 10 A third part of the schematic diagram of the first acquisition circuit.

[0089] Figure 11 A block diagram of the monitoring system corresponding to the second embodiment.

[0090] In the figure, 1 is a first receiving magnetic head; 2 is a first transmitting magnetic head; 3 is a second receiving magnetic head; 4 is a second transmitting magnetic head; and 5 is a conventional axle detector. DETAILED DESCRIPTION

[0091] The technical solutions of the present application will be described in detail below with reference to the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0092] Embodiment I

[0093] Referring to Figures 4 to 10 The present embodiment provides a smart axle detector for spoke wheel sensors, which comprises a first wheel detection module, a second wheel detection module, an FSK modulation module, a first acquisition module, a second acquisition module and a main control module.

[0094] The first end of the first wheel detection module is used for connecting with the external first transmitting magnetic head 2, the second end of the first wheel detection module is used for connecting with the external first receiving magnetic head 1, and the third end of the first wheel detection module is connected with the first end of the FSK modulation module.

[0095] The first end of the second wheel detection module is configured to be connected with the second transmitting magnetic head 4 outside, the second end of the second wheel detection module is configured to be connected with the second receiving magnetic head 3 outside, and the third end of the second wheel detection module is connected with the second end of the FSK modulation module.

[0096] The third end of the FSK modulation module is configured to be connected with the axle counting host outside through the FSK signal transmission line.

[0097] The first acquisition module is configured to acquire the characteristic parameters of the first wheel detection module and send the acquired characteristic parameters of the first wheel detection module to the main control module.

[0098] The second acquisition module is configured to acquire the characteristic parameters of the second wheel detection module and send the acquired characteristic parameters of the second wheel detection module to the main control module.

[0099] The characteristic parameters include amplitude parameters, phase difference parameters and frequency parameters.

[0100] The main control module is configured to compare each characteristic parameter sent by the first acquisition module and the second acquisition module with a preset reference value corresponding to the characteristic parameter, and generate monitoring information after comparison. The main control module includes a single-chip microcomputer, and the model of the single-chip microcomputer is STM32F407.

[0101] Further, as shown in Figure 6 The wheel axle detector further includes a PLC sending module and a PLC receiving module for realizing communication with the external host computer. The PLC sending module is connected with the main control module, the PLC sending module is further connected with the PLC receiving module through the FSK signal transmission line, and the PLC receiving module is further configured to be connected with the external host computer. The PLC sending module is configured to receive the monitoring information sent by the main control module, modulate the monitoring information, and then couple the modulated monitoring information to the FSK signal transmission line. The PLC receiving module is configured to decouple the modulated monitoring information from the FSK signal transmission line, demodulate the modulated monitoring information, and then send the demodulated monitoring information to the external host computer. In the embodiment, the coupling or decoupling is realized by a transformer.

[0102] Specifically, as shown in Figure 7As shown, the PLC transmitting module includes a first microprocessor, a first carrier modulation and demodulation circuit, and a first transmission line coupling circuit. The first microprocessor is connected to both the main control module and the first carrier modulation and demodulation circuit. The first transmission line coupling circuit is connected to both the first carrier modulation and demodulation circuit and the FSK signal transmission line. The PLC receiving module includes a second microprocessor, a second carrier modulation and demodulation circuit, and a second transmission line coupling circuit. The second microprocessor is connected to the second carrier modulation and demodulation circuit and is also used to connect to an external host computer. The second transmission line coupling circuit is connected to both the second carrier modulation and demodulation circuit and the FSK signal transmission line. It is evident that the PLC transmitting module and the PLC receiving module contain the same functional modules. Preferably, an automatic gain control circuit is connected in series between the first carrier modulation and demodulation circuit and the first transmission line coupling circuit to amplify the signal output by the first carrier modulation and demodulation circuit. A serial port isolation circuit is added between the first microprocessor and the main control module to avoid interference from the PLC transmitting module to the main control module. In addition, the PLC transmitting module is powered by an external power supply. Accordingly, the PLC transmitting module also includes a power conversion circuit, which is connected to the external power supply and then performs power voltage conversion.

[0103] Specifically, such as Figure 4 As shown, the first acquisition module includes a first acquisition circuit, a second acquisition circuit, a third acquisition circuit, a fourth acquisition circuit, a fifth acquisition circuit, a sixth acquisition circuit, and a seventh acquisition circuit.

[0104] The first acquisition circuit is used to acquire the first amplitude parameter of the output voltage of the power supply circuit in the first wheel detection module, and send the acquired first amplitude parameter to the main control module.

[0105] The second acquisition circuit is used to acquire the first frequency parameter of the output signal of the transmission signal generation circuit in the first wheel detection module, and send the acquired first frequency parameter to the main control module. In this embodiment, the operating frequency of the first wheel detection module is 30KHz. The second acquisition circuit includes a first optocoupler. The second acquisition circuit inputs the 30KHz pulse signal output by the transmission signal generation circuit into the main control module after isolation by the first optocoupler. The first optocoupler is a 6N137.

[0106] The third acquisition circuit is used to acquire the second amplitude parameter and the second frequency parameter of the output signal of the transmitting signal amplification circuit in the first wheel detection module, and send the acquired second amplitude parameter and second frequency parameter to the main control module.

[0107] The fourth acquisition circuit is used to acquire the third amplitude parameter and the third frequency parameter of the output signal of the receiving signal amplification circuit in the first wheel detection module, and send the acquired third amplitude parameter and third frequency parameter to the main control module.

[0108] The fifth acquisition circuit is used to acquire the first phase difference parameter of the phase difference signal output by the phase detection circuit of the receiving signal in the first wheel detection module, and send the acquired first phase difference parameter to the main control module. The phase difference signal output by the phase detection circuit of the receiving signal in the first wheel detection module is a pulsating DC signal. In this embodiment, the fifth acquisition circuit includes a comparator, an inverter, and a second optocoupler. The fifth acquisition circuit converts the pulsating DC signal into a square wave through the comparator, then shapes the square wave through the inverter, and finally inputs it to the main control module after isolation by the second optocoupler included in the fifth acquisition circuit. The comparator is an LM139, and the inverter is a CD4069.

[0109] The sixth acquisition circuit is used to acquire the fourth amplitude parameter of the DC signal output by the receiving signal filtering circuit in the first wheel detection module, and send the acquired fourth amplitude parameter to the main control module.

[0110] The seventh acquisition circuit is used to acquire the fifth amplitude parameter of the digital pulse signal output by the signal amplitude discrimination circuit in the first wheel detection module, and send the acquired fifth amplitude parameter to the main control module. The digital pulse signal output by the signal amplitude discrimination circuit in the first wheel detection module is input to the main control module after being isolated by the third optocoupler contained in the seventh acquisition circuit.

[0111] Specifically, such as Figure 5 As shown, the second acquisition module includes an eighth acquisition circuit, a ninth acquisition circuit, a tenth acquisition circuit, an eleventh acquisition circuit, a twelfth acquisition circuit, a thirteenth acquisition circuit, and a fourteenth acquisition circuit. The first acquisition circuit has the same structure as the eighth acquisition circuit, the second acquisition circuit has the same structure as the ninth acquisition circuit, the third acquisition circuit has the same structure as the tenth acquisition circuit, the fourth acquisition circuit has the same structure as the eleventh acquisition circuit, the fifth acquisition circuit has the same structure as the twelfth acquisition circuit, the sixth acquisition circuit has the same structure as the thirteenth acquisition circuit, and the seventh acquisition circuit has the same structure as the fourteenth acquisition circuit.

[0112] The eighth acquisition circuit is used to acquire the sixth amplitude parameter of the output voltage of the power supply circuit in the second wheel detection module, and send the acquired sixth amplitude parameter to the main control module.

[0113] The ninth acquisition circuit is used to acquire the fourth frequency parameter of the output signal of the signal generation circuit in the second wheel detection module, and send the acquired fourth frequency parameter to the main control module.

[0114] The tenth acquisition circuit is used to acquire the seventh amplitude parameter and the fifth frequency parameter of the output signal of the transmitting signal amplification circuit in the second wheel detection module, and send the acquired seventh amplitude parameter and fifth frequency parameter to the main control module.

[0115] The eleventh acquisition circuit is used for acquiring an eighth amplitude parameter and a sixth frequency parameter of an output signal of the receiving signal amplification circuit in the second wheel detection module, and sending the acquired eighth amplitude parameter and sixth frequency parameter to the main control module.

[0116] The twelfth acquisition circuit is used for acquiring a second phase difference parameter of a phase difference signal output by the receiving signal phase discriminator in the second wheel detection module, and sending the acquired second phase difference parameter to the main control module.

[0117] The thirteenth acquisition circuit is used for acquiring a ninth amplitude parameter of a direct current signal output by the receiving signal filter in the second wheel detection module, and sending the acquired ninth amplitude parameter to the main control module.

[0118] The fourteenth acquisition circuit is used for acquiring a tenth amplitude parameter of a digital pulse signal output by the receiving signal amplitude discriminator in the second wheel detection module, and sending the acquired tenth amplitude parameter to the main control module.

[0119] Further, as shown in Figure 5 the axle detector further comprises a calibration switch and a fifteenth acquisition circuit. The fifteenth acquisition circuit is used for generating a first level signal when the calibration switch is turned on, and sending the first level signal to the main control module. The main control module takes the characteristic parameter acquired at the current time when the first level signal arrives as the preset reference value corresponding to the characteristic parameter, thereby completing the setting of the preset reference value of each characteristic parameter.

[0120] Further, as shown in Figure 5 the main control module is further connected with an EEPROM memory, an ADC reference voltage source and a temperature sensor. The ADC reference voltage source adopts a high-precision REF35205 model, and the reference voltage is 2.048V, which improves the accuracy of the calculation of each analog quantity in the characteristic parameter by the main control module, thereby also improving the accuracy of the monitoring information output by the axle detector. After the axle detector is installed, the calibration switch is pressed, the characteristic parameter acquired at this time is taken as the preset reference value corresponding to the characteristic parameter, and the preset reference value is written into the EEPROM memory. The main control module reads the preset reference value from the EEPROM memory after the axle detector is powered on each time. The temperature sensor is used for measuring the ambient temperature of the axle detector, thereby realizing the monitoring of the ambient temperature of the axle detector.

[0121] Further, as shown in Figures 8 to 10As shown, the first acquisition circuit includes a first isolation type operational amplifier, an output end of the power supply circuit in the first wheel detection module is connected with an input end of the first isolation type operational amplifier, and an output end of the first isolation type operational amplifier is connected with a first ADC end of the master control module. Specifically, the first acquisition circuit includes a first operational amplifier U1, a first isolation type operational amplifier U2 and a second operational amplifier U3, the first operational amplifier U1 adopts a model of LM358DR, the first isolation type operational amplifier U2 adopts a model of AMC1351, and the second operational amplifier U3 adopts a model of LM358DR. An output end of the power supply circuit in the first wheel detection module is connected with a first end of a first inductor L1 after being divided by a voltage dividing resistor, a second end of the first inductor L1 is connected with a first end of a first resistor R1, a second end of the first resistor R1 is respectively connected with a first end of a first TVS tube D1 and a first end of a second resistor R2, a second end of the first TVS tube D1 and a second end of the second resistor R2 are both connected to a first ground end AGND_IN, the second end of the first resistor R1 is also connected with a +IN1 end of the first operational amplifier U1, an -IN1 end of the first operational amplifier U1 is connected with an OUT1 end of the first operational amplifier U1, a V- end of the first operational amplifier U1 is connected with the first ground end AGND_IN, a V+ end of the first operational amplifier U1 is connected with a first power supply end AVCC_IN, a first capacitor C1 is connected in series between the V- end of the first operational amplifier U1 and the V+ end of the first operational amplifier U1, an OUT1 end of the first operational amplifier U1 is connected with a first end of a third resistor R3, a second end of the third resistor R3 is respectively connected with a first end of a second capacitor C2 and a VIN end of the first isolation type operational amplifier U2, a second end of the second capacitor C2 is connected with the first ground end AGND_IN, two GND1 ends of the first isolation type operational amplifier U2 are both connected to the first ground end AGND_IN, a VDD1 end of the first isolation type operational amplifier U2 is connected to the first power supply end AVCC_IN, the VDD1 end of the first isolation type operational amplifier U2 is also connected to the first ground end AGND_IN through a third capacitor C3, a VDD2 end of the first isolation type operational amplifier U2 is connected to a second power supply end AVCC_OUT, the VDD2 end of the first isolation type operational amplifier U2 is also connected to a first end of a fourth capacitor C4, a second end of the fourth capacitor C4 is respectively connected to a second ground end AGND_OUT, a first end of a fifth capacitor C5 and a first end of a fourth resistor R4, a second end of the fifth capacitor C5 is connected with a second end of the fourth resistor R4, the second end of the fifth capacitor C5 is also connected with a first end of a fifth resistor R5, a VOUTP end of the first isolation type operational amplifier U2 is connected with a second end of the fifth resistor R5, a VOUTN end of the first isolation type operational amplifier U2 is connected with a first end of a sixth resistor R6, and a GND2 end of the first isolation type operational amplifier U2 is connected to the second ground end AGND_OUT.The first end of the fifth resistor R5 is also connected with the +IN1 end of the second operational amplifier U3, the second end of the sixth resistor R6 is connected with the -IN1 end of the second operational amplifier U3, the -IN1 end of the second operational amplifier U3 is also respectively connected with the first end of the seventh resistor R7 and the first end of the sixth capacitor C6, the second end of the seventh resistor R7 and the second end of the sixth capacitor C6 are both connected to the OUT1 end of the second operational amplifier U3, the OUT1 end of the second operational amplifier U3 is connected with the first end of the eighth resistor R8, the second end of the eighth resistor R8 is connected to the first ADC end of the master control module, the second end of the eighth resistor R8 is also connected to the second ground end AGND_OUT through the seventh capacitor C7, and the V- end of the second operational amplifier U3 and the V+ end of the second operational amplifier U3 are both connected to the second ground end AGND_OUT.

[0122] The third acquisition circuit includes a second isolation type operational amplifier, the output end of the transmitting signal amplification circuit in the first wheel detection module is connected with the input end of the second isolation type operational amplifier, and the output end of the second isolation type operational amplifier is connected with the second ADC end of the master control module. The model of the second isolation type operational amplifier is AMC1350.

[0123] The fourth acquisition circuit includes a third isolation type operational amplifier, the output end of the receiving signal amplification circuit in the first wheel detection module is connected with the input end of the third isolation type operational amplifier, and the output end of the third isolation type operational amplifier is connected with the third ADC end of the master control module. The model of the third isolation type operational amplifier is AMC1350.

[0124] The sixth acquisition circuit includes a fourth isolation type operational amplifier, the output end of the receiving signal filtering circuit in the first wheel detection module is connected with the input end of the fourth isolation type operational amplifier, and the output end of the fourth isolation type operational amplifier is connected with the fourth ADC end of the master control module. The model of the fourth isolation type operational amplifier is AMC1301.

[0125] Further, each feature parameter sent by the first acquisition module and the second acquisition module is compared with a preset reference value corresponding to the feature parameter, and monitoring information is generated after the comparison, and the specific process is as follows:

[0126] If the absolute value of the difference between the fifth amplitude parameter and the preset reference value corresponding to the fifth amplitude parameter is less than the first threshold value, monitoring information representing that the fifth amplitude parameter is a high level is generated; in the embodiment, the preset reference value corresponding to the fifth amplitude parameter is preferably set as a logic high level;

[0127] If the preset reference value corresponding to the fifth amplitude parameter is greater than the fifth amplitude parameter, and the difference between the fifth amplitude parameter and the preset reference value corresponding to the fifth amplitude parameter is greater than the second threshold value, monitoring information representing that the fifth amplitude parameter is a low level is generated; wherein the second threshold value is greater than the first threshold value.

[0128] If the absolute value of the difference between the tenth amplitude parameter and the preset reference value corresponding to the tenth amplitude parameter is less than the third threshold value, monitoring information indicating that the tenth amplitude parameter is a high level is generated; in the embodiment, the preset reference value corresponding to the tenth amplitude parameter is preferably set to a logic high level;

[0129] If the preset reference value corresponding to the tenth amplitude parameter is greater than the tenth amplitude parameter, and the difference between the tenth amplitude parameter and the preset reference value corresponding to the tenth amplitude parameter is greater than the fourth threshold value, monitoring information indicating that the tenth amplitude parameter is a low level is generated; wherein the fourth threshold value is greater than the third threshold value.

[0130] Whether the absolute value of the difference between each of the remaining characteristic parameters except the fifth amplitude parameter and the tenth amplitude parameter and the preset reference value corresponding to the characteristic parameter is greater than the preset threshold value corresponding to the characteristic parameter is calculated respectively, if yes, monitoring information indicating that the characteristic parameter is abnormal is generated; otherwise, monitoring information indicating that the characteristic parameter is normal is generated. For example, when the calibration switch is pressed, the sixth acquisition circuit acquires the fourth amplitude parameter, and the master control module processes and calculates the acquired fourth amplitude parameter signal to obtain the amplitude value corresponding to the fourth amplitude parameter, which is 500mv, and takes this value as the preset reference value of the fourth amplitude parameter. The master control module has a preset threshold value of the fourth amplitude parameter, and the preset threshold value is 50mv. Therefore, the normal range of the amplitude value corresponding to the fourth amplitude parameter in subsequent real-time acquisition should be 450-550mv. If the amplitude value corresponding to the fourth amplitude parameter in subsequent real-time acquisition is within the range, the master control module generates monitoring information indicating that the fourth amplitude parameter is normal. If the receiving signal filtering circuit or the electrical module before the receiving signal filtering circuit fails and an electrical parameter drift occurs, resulting in that the amplitude value corresponding to the fourth amplitude parameter in real-time acquisition is not within the range, monitoring information indicating that the fourth amplitude parameter is abnormal is generated.

[0131] Embodiment two

[0132] As shown in Figure 11 , the embodiment provides a monitoring system, which comprises the intelligent wheel detector for the spoke wheel sensor provided in the embodiment one and the upper computer, the wheel detector and the upper computer are in communication connection, and the wheel detector is further used for communication connection with the external axle counting host.

[0133] The upper computer is used for, when the axle counting host determines that the wheel detection state is abnormal and there is no wheel above the first transmitting magnetic head 2, the second transmitting magnetic head 4, the first receiving magnetic head 1 and the second receiving magnetic head 3, estimating the fault points of the wheel detector, the first transmitting magnetic head 2, the second transmitting magnetic head 4, the first receiving magnetic head 1 and the second receiving magnetic head 3 according to the monitoring information, and is used for performing characteristic parameter abnormality early warning according to the monitoring information.

[0134] Preferably, the failure points of the wheel detector, the first transmitting magnetic head 2, the second transmitting magnetic head 4, the first receiving magnetic head 1 and the second receiving magnetic head 3 are estimated according to the monitoring information, and the specific process is as follows:

[0135] If the monitoring information indicates that the fifth amplitude parameter is high and the tenth amplitude parameter is high, it is determined that the FSK modulation module is a failure point. The operation and maintenance personnel replace the FSK modulation module according to the estimation result, and quickly complete the troubleshooting.

[0136] If the monitoring information indicates that the fifth amplitude parameter is low, the first wheel detection module failure estimation step is performed.

[0137] If the monitoring information indicates that the tenth amplitude parameter is low, the second wheel detection module failure estimation step is performed.

[0138] The first wheel detection module failure estimation step specifically includes:

[0139] S01, if the monitoring information indicates that the fourth amplitude parameter is normal, it is estimated that the receiving signal amplitude judgment circuit in the first wheel detection module is a failure point, otherwise S02 is performed. If the estimation result indicates that the receiving signal amplitude judgment circuit in the first wheel detection module is faulty, the operation and maintenance personnel analyze and detect the first wheel detection module according to the estimation result, replace the first wheel detection module, and then return the replaced and faulty first wheel detection module for repair. In the repair, the board-level maintenance work is carried out based on the estimated failure point of the receiving signal amplitude judgment circuit.

[0140] S02, if the monitoring information indicates that the first phase difference parameter is normal, it is estimated that the receiving signal filtering circuit in the first wheel detection module is a failure point, otherwise S03 is performed. If the estimation result indicates that the receiving signal filtering circuit in the first wheel detection module is faulty, the operation and maintenance personnel analyze and detect the first wheel detection module according to the estimation result, replace the first wheel detection module, and then return the replaced and faulty first wheel detection module for repair. In the repair, the board-level maintenance work is carried out based on the estimated failure point of the receiving signal filtering circuit.

[0141] S03, if the monitoring information indicates that the third amplitude parameter and the third frequency parameter are normal, it is estimated that the receiving signal phase judgment circuit in the first wheel detection module is a failure point, otherwise S04 is performed. If the estimation result indicates that the receiving signal phase judgment circuit in the first wheel detection module is faulty, the operation and maintenance personnel analyze and detect the first wheel detection module according to the estimation result, replace the first wheel detection module, and then return the replaced and faulty first wheel detection module for repair. In the repair, the board-level maintenance work is carried out based on the estimated failure point of the receiving signal phase judgment circuit.

[0142] S04, if the monitoring information represents that both the second amplitude parameter and the second frequency parameter are normal, it is estimated that the receiving signal amplification circuit in the first wheel detection module or the first receiving magnetic head 1 or the first transmitting magnetic head 2 is the fault point, otherwise, S05 is executed. If the estimation result represents that the receiving signal amplification circuit in the first wheel detection module or the first receiving magnetic head 1 or the first transmitting magnetic head 2 is faulty, the maintenance personnel analyzes and detects the first wheel detection module, the first receiving magnetic head 1 and the first transmitting magnetic head 2 in sequence according to the estimation result. If it is determined that the first wheel detection module is faulty, the first wheel detection module is replaced, and the replaced first wheel detection module which has occurred fault is repaired, and the board-level maintenance work is carried out at the estimated receiving signal amplification circuit fault point in the repair. If it is determined that the first receiving magnetic head 1 is faulty, the first receiving magnetic head 1 is replaced. If it is determined that the first transmitting magnetic head 2 is faulty, the first transmitting magnetic head 2 is replaced.

[0143] S05, if the monitoring information represents that the first frequency parameter is normal, it is estimated that the transmitting signal amplification circuit in the first wheel detection module is the fault point, otherwise, S06 is executed. If the estimation result represents that the transmitting signal amplification circuit in the first wheel detection module is faulty, the maintenance personnel analyzes and detects the first wheel detection module according to the estimation result, and replaces the first wheel detection module, and then the replaced first wheel detection module which has occurred fault is repaired, and the board-level maintenance work is carried out at the estimated transmitting signal amplification circuit fault point in the repair.

[0144] S06, if the monitoring information represents that the first amplitude parameter is normal, it is estimated that the transmitting signal generation circuit in the first wheel detection module is the fault point, otherwise, it is estimated that the power supply circuit in the first wheel detection module is the fault point. If the estimation result represents that the transmitting signal generation circuit or the power supply circuit in the first wheel detection module is faulty, the maintenance personnel analyzes and detects the first wheel detection module according to the estimation result, and replaces the first wheel detection module, and then the replaced first wheel detection module which has occurred fault is repaired, and the board-level maintenance work is carried out at the estimated transmitting signal generation circuit or power supply circuit fault point in the repair.

[0145] The second wheel detection module fault estimation step is specifically:

[0146] S001, if the monitoring information represents that the ninth amplitude parameter is normal, it is estimated that the receiving signal amplitude detection circuit in the second wheel detection module is the fault point, otherwise, S002 is executed. If the estimation result represents that the receiving signal amplitude detection circuit in the second wheel detection module is faulty, the maintenance personnel analyzes and detects the second wheel detection module according to the estimation result, and replaces the second wheel detection module, and then the replaced second wheel detection module which has occurred fault is repaired, and the board-level maintenance work is carried out at the estimated receiving signal amplitude detection circuit fault point in the repair.

[0147] S002、If the monitoring information represents that the second phase difference parameter is normal, it is estimated that the receiving signal filtering circuit in the second wheel detection module is the fault point, otherwise S003 is executed. If the estimation result represents that the receiving signal filtering circuit in the second wheel detection module is faulty, then the operation and maintenance personnel analyzes and detects the second wheel detection module according to the estimation result, replaces the second wheel detection module, and then returns the replaced second wheel detection module which has occurred fault for repair, and carries out board-level maintenance work at the estimated receiving signal filtering circuit fault point in the repair.

[0148] S003、If the monitoring information represents that the eighth amplitude parameter and the sixth frequency parameter are normal, it is estimated that the receiving signal phase detection circuit in the second wheel detection module is the fault point, otherwise S004 is executed. If the estimation result represents that the receiving signal phase detection circuit in the second wheel detection module is faulty, then the operation and maintenance personnel analyzes and detects the second wheel detection module according to the estimation result, replaces the second wheel detection module, and then returns the replaced second wheel detection module which has occurred fault for repair, and carries out board-level maintenance work at the estimated receiving signal phase detection circuit fault point in the repair.

[0149] S004、If the monitoring information represents that the seventh amplitude parameter and the fifth frequency parameter are normal, it is estimated that the receiving signal amplification circuit or the second receiving magnetic head 3 or the second transmitting magnetic head 4 in the second wheel detection module is the fault point, otherwise S005 is executed. If the estimation result represents that the receiving signal amplification circuit or the second receiving magnetic head 3 or the second transmitting magnetic head 4 in the second wheel detection module is faulty, then the operation and maintenance personnel analyzes and detects the second wheel detection module, the second receiving magnetic head 3 and the second transmitting magnetic head 4 in sequence according to the estimation result. If it is determined that the second wheel detection module is faulty, then the second wheel detection module is replaced, and the replaced second wheel detection module which has occurred fault is returned for repair, and board-level maintenance work is carried out at the estimated receiving signal amplification circuit fault point in the repair. If it is determined that the second receiving magnetic head 3 is faulty, then the second receiving magnetic head 3 is replaced. If it is determined that the second transmitting magnetic head 4 is faulty, then the second transmitting magnetic head 4 is replaced.

[0150] S005、If the monitoring information represents that the fourth frequency parameter is normal, it is estimated that the transmitting signal amplification circuit in the second wheel detection module is the fault point, otherwise S006 is executed. If the estimation result represents that the transmitting signal amplification circuit in the second wheel detection module is faulty, then the operation and maintenance personnel analyzes and detects the second wheel detection module according to the estimation result, replaces the second wheel detection module, and then returns the replaced second wheel detection module which has occurred fault for repair, and carries out board-level maintenance work at the estimated transmitting signal amplification circuit fault point in the repair.

[0151] S006、If the monitoring information represents that the sixth amplitude parameter is normal, it is estimated that the signal generating circuit in the second wheel detection module is the fault point, otherwise it is estimated that the power supply circuit in the second wheel detection module is the fault point. If the estimation result represents that the signal generating circuit or the power supply circuit in the second wheel detection module is faulty, then the operation and maintenance personnel analyzes and detects the second wheel detection module according to the estimation result, replaces the second wheel detection module, and then returns the replaced second wheel detection module which has occurred fault for repair. In the repair, the board-level maintenance work is carried out according to the estimated signal generating circuit or power supply circuit fault point.

[0152] The above description is only preferred embodiments of the present application, and it should be understood that the present application is not limited to the forms disclosed herein, and should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concepts described herein by the above teachings or related art or knowledge. Any modification and change made by those skilled in the art without departing from the spirit and scope of the present application shall be within the protection scope of the appended claims of the present application.

Claims

1. A smart axle detector for spoke wheel sensor, the axle detector comprising a first wheel detection module, a second wheel detection module and a FSK modulation module, a first end of the first wheel detection module is configured to be connected with an external first transmitting magnetic head, a second end of the first wheel detection module is configured to be connected with an external first receiving magnetic head, a third end of the first wheel detection module is connected with a first end of the FSK modulation module, a first end of the second wheel detection module is configured to be connected with an external second transmitting magnetic head, a second end of the second wheel detection module is configured to be connected with an external second receiving magnetic head, a third end of the second wheel detection module is connected with a second end of the FSK modulation module, a third end of the FSK modulation module is configured to be connected with an external axle counter host via a FSK signal transmission line, characterized in that, The wheel shaft detector further comprises a first acquisition module, a second acquisition module and a master control module; The first acquisition module is configured to acquire characteristic parameters of the first wheel detection module and send the acquired characteristic parameters of the first wheel detection module to the master control module; The second acquisition module is configured to acquire characteristic parameters of the second wheel detection module and send the acquired characteristic parameters of the second wheel detection module to the master control module; The characteristic parameters comprise amplitude parameters, phase difference parameters and frequency parameters; The master control module is configured to compare each characteristic parameter sent by the first acquisition module and the second acquisition module with a preset reference value corresponding to the characteristic parameter, and generate monitoring information after comparison; The wheel shaft detector further comprises a PLC sending module and a PLC receiving module, the PLC sending module is connected with the master control module, the PLC sending module is further connected with the PLC receiving module through the FSK signal transmission line, and the PLC receiving module is configured to be connected with an external host computer; The PLC sending module is configured to receive the monitoring information sent by the master control module, modulate the monitoring information, and then couple the modulated monitoring information to the FSK signal transmission line; The PLC receiving module is configured to decouple the modulated monitoring information from the FSK signal transmission line, demodulate the modulated monitoring information, and then send the demodulated monitoring information to the external host computer; The wheel shaft detector further comprises a calibration switch and a fifteenth acquisition circuit; The fifteenth acquisition circuit is configured to generate a first level signal when the calibration switch is turned on, and send the first level signal to the master control module; The master control module takes the characteristic parameter acquired at the current time when the first level signal arrives as the preset reference value corresponding to the characteristic parameter.

2. The smart axle detector for spoke wheel sensor according to claim 1, wherein, The first acquisition module comprises a first acquisition circuit, a second acquisition circuit, a third acquisition circuit, a fourth acquisition circuit, a fifth acquisition circuit, a sixth acquisition circuit and a seventh acquisition circuit; The first acquisition circuit is configured to acquire a first amplitude parameter of the output voltage of the power supply circuit in the first wheel detection module, and send the acquired first amplitude parameter to the master control module; The second acquisition circuit is configured to acquire a first frequency parameter of the output signal of the transmitting signal generation circuit in the first wheel detection module, and send the acquired first frequency parameter to the master control module; The third acquisition circuit is configured to acquire a second amplitude parameter and a second frequency parameter of the output signal of the transmitting signal amplification circuit in the first wheel detection module, and send the acquired second amplitude parameter and second frequency parameter to the master control module; The fourth acquisition circuit is configured to acquire a third amplitude parameter and a third frequency parameter of the output signal of the receiving signal amplification circuit in the first wheel detection module, and send the acquired third amplitude parameter and third frequency parameter to the master control module; The fifth acquisition circuit is configured to acquire a first phase difference parameter of the phase difference signal output by the receiving signal phase detection circuit in the first wheel detection module, and send the acquired first phase difference parameter to the master control module; The sixth acquisition circuit is used for acquiring a fourth amplitude parameter of a direct current signal output by a receiving signal filtering circuit in the first wheel detection module, and sending the acquired fourth amplitude parameter to the main control module; The seventh acquisition circuit is used for acquiring a fifth amplitude parameter of a digital pulse signal output by a receiving signal amplitude judging circuit in the first wheel detection module, and sending the acquired fifth amplitude parameter to the main control module.

3. The smart axle detector for spoke wheel sensor according to claim 2, wherein, The second acquisition module comprises an eighth acquisition circuit, a ninth acquisition circuit, a tenth acquisition circuit, an eleventh acquisition circuit, a twelfth acquisition circuit, a thirteenth acquisition circuit and a fourteenth acquisition circuit, the first acquisition circuit and the eighth acquisition circuit are of the same structure, the second acquisition circuit and the ninth acquisition circuit are of the same structure, the third acquisition circuit and the tenth acquisition circuit are of the same structure, the fourth acquisition circuit and the eleventh acquisition circuit are of the same structure, the fifth acquisition circuit and the twelfth acquisition circuit are of the same structure, the sixth acquisition circuit and the thirteenth acquisition circuit are of the same structure, and the seventh acquisition circuit and the fourteenth acquisition circuit are of the same structure; The eighth acquisition circuit is used for acquiring a sixth amplitude parameter of a voltage output by a power supply circuit in the second wheel detection module, and sending the acquired sixth amplitude parameter to the main control module; The ninth acquisition circuit is used for acquiring a fourth frequency parameter of a signal output by a transmitting signal generating circuit in the second wheel detection module, and sending the acquired fourth frequency parameter to the main control module; The tenth acquisition circuit is used for acquiring a seventh amplitude parameter and a fifth frequency parameter of a signal output by a transmitting signal amplifying circuit in the second wheel detection module, and sending the acquired seventh amplitude parameter and the fifth frequency parameter to the main control module; The eleventh acquisition circuit is used for acquiring an eighth amplitude parameter and a sixth frequency parameter of a signal output by a receiving signal amplifying circuit in the second wheel detection module, and sending the acquired eighth amplitude parameter and the sixth frequency parameter to the main control module; The twelfth acquisition circuit is used for acquiring a second phase difference parameter of a phase difference signal output by a receiving signal phase judging circuit in the second wheel detection module, and sending the acquired second phase difference parameter to the main control module; The thirteenth acquisition circuit is used for acquiring a ninth amplitude parameter of a direct current signal output by a receiving signal filtering circuit in the second wheel detection module, and sending the acquired ninth amplitude parameter to the main control module; The fourteenth acquisition circuit is used for acquiring a tenth amplitude parameter of a digital pulse signal output by a receiving signal amplitude judging circuit in the second wheel detection module, and sending the acquired tenth amplitude parameter to the main control module.

4. The intelligent wheel detector for spoke wheel sensors according to claim 1, wherein the PLC sending module comprises a first microprocessor, a first carrier wave modulation and demodulation circuit and a first transmission line coupling circuit, the first microprocessor is connected with the main control module and the first carrier wave modulation and demodulation circuit respectively, and the first transmission line coupling circuit is connected with the first carrier wave modulation and demodulation circuit and the FSK signal transmission line respectively. ​ The PLC receiving module comprises a second microprocessor, a second carrier wave modulation and demodulation circuit and a second transmission line coupling circuit, the second microprocessor is connected with the second carrier wave modulation and demodulation circuit, the second microprocessor is further used for connecting with an external host computer, and the second transmission line coupling circuit is connected with the second carrier wave modulation and demodulation circuit and the FSK signal transmission line respectively.

5. The smart wheel detector for spoke wheel sensors according to claim 2, wherein The first acquisition circuit comprises a first isolation type operational amplifier, an output end of a power supply circuit in the first wheel detection module is connected with an input end of the first isolation type operational amplifier, and an output end of the first isolation type operational amplifier is connected with a first ADC end of the master control module; The third acquisition circuit comprises a second isolation type operational amplifier, an output end of a transmitting signal amplification circuit in the first wheel detection module is connected with an input end of the second isolation type operational amplifier, and an output end of the second isolation type operational amplifier is connected with a second ADC end of the master control module; The fourth acquisition circuit comprises a third isolation type operational amplifier, an output end of a receiving signal amplification circuit in the first wheel detection module is connected with an input end of the third isolation type operational amplifier, and an output end of the third isolation type operational amplifier is connected with a third ADC end of the master control module; The sixth acquisition circuit comprises a fourth isolation type operational amplifier, an output end of a receiving signal filtering circuit in the first wheel detection module is connected with an input end of the fourth isolation type operational amplifier, and an output end of the fourth isolation type operational amplifier is connected with a fourth ADC end of the master control module.

6. The smart axle detector for spoke wheel sensor according to claim 3, wherein, The first acquisition module and the second acquisition module are used for sending each characteristic parameter and a preset reference value corresponding to the characteristic parameter, and monitoring information is generated after comparison, and the specific process is as follows: If the absolute value of the difference between the fifth amplitude parameter and the preset reference value corresponding to the fifth amplitude parameter is less than the first threshold value, monitoring information representing that the fifth amplitude parameter is a high level is generated; If the preset reference value corresponding to the fifth amplitude parameter is greater than the fifth amplitude parameter, and the difference between the fifth amplitude parameter and the preset reference value corresponding to the fifth amplitude parameter is greater than the second threshold value, monitoring information representing that the fifth amplitude parameter is a low level is generated; If the absolute value of the difference between the tenth amplitude parameter and the preset reference value corresponding to the tenth amplitude parameter is less than the third threshold value, monitoring information representing that the tenth amplitude parameter is a high level is generated; If the preset reference value corresponding to the tenth amplitude parameter is greater than the tenth amplitude parameter, and the difference between the tenth amplitude parameter and the preset reference value corresponding to the tenth amplitude parameter is greater than the fourth threshold value, monitoring information representing that the tenth amplitude parameter is a low level is generated; The absolute values of the differences between the remaining characteristic parameters except the fifth amplitude parameter and the tenth amplitude parameter and the preset reference values corresponding to the characteristic parameters are respectively judged, if the absolute value of the difference between the characteristic parameter and the preset reference value corresponding to the characteristic parameter is greater than the preset threshold value corresponding to the characteristic parameter, monitoring information representing that the characteristic parameter is abnormal is generated, otherwise, monitoring information representing that the characteristic parameter is normal is generated; The second threshold value is greater than the first threshold value, and the fourth threshold value is greater than the third threshold value.

7. A monitoring system, characterized by The application relates to a smart wheel shaft detector and a host computer for a spoke wheel sensor, wherein the wheel shaft detector and the host computer are in communication connection, and the wheel shaft detector is further used for being in communication connection with an external wheel shaft host computer. The host computer is used for estimating fault points of the wheel shaft detector, the first transmitting magnetic head, the second transmitting magnetic head, the first receiving magnetic head and the second receiving magnetic head according to monitoring information when the wheel shaft host computer determines that the wheel detection state is abnormal and no wheel is above the first transmitting magnetic head, the second transmitting magnetic head, the first receiving magnetic head and the second receiving magnetic head, and is used for performing characteristic parameter abnormality early warning according to the monitoring information.

8. The monitoring system of claim 7, wherein, The specific process of estimating the fault points of the wheel shaft detector, the first transmitting magnetic head, the second transmitting magnetic head, the first receiving magnetic head and the second receiving magnetic head according to the monitoring information is as follows: If the fifth amplitude parameter and the tenth amplitude parameter are high level, it is determined that the FSK modulation module is a fault point; If the fifth amplitude parameter is low level, the first wheel detection module fault estimation step is performed; If the tenth amplitude parameter is low level, the second wheel detection module fault estimation step is performed; The first wheel detection module fault estimation step is specifically as follows: S01, if the fourth amplitude parameter is normal, it is estimated that the receiving signal amplitude judging circuit in the first wheel detection module is a fault point, otherwise the next step is performed; S02, if the first phase difference parameter is normal, it is estimated that the receiving signal filtering circuit in the first wheel detection module is a fault point, otherwise the next step is performed; S03, if the third amplitude parameter and the third frequency parameter are normal, it is estimated that the receiving signal phase judging circuit in the first wheel detection module is a fault point, otherwise the next step is performed; S04, if the second amplitude parameter and the second frequency parameter are normal, it is estimated that the receiving signal amplifying circuit, the first receiving magnetic head or the first transmitting magnetic head in the first wheel detection module is a fault point, otherwise the next step is performed; S05, if the first frequency parameter is normal, it is estimated that the transmitting signal amplifying circuit in the first wheel detection module is a fault point, otherwise the next step is performed; S06, if the first amplitude parameter is normal, it is estimated that the transmitting signal generating circuit in the first wheel detection module is a fault point, otherwise it is estimated that the power supply circuit in the first wheel detection module is a fault point; The second wheel detection module fault estimation step is specifically as follows: S001, if the ninth amplitude parameter is normal, it is estimated that the receiving signal amplitude judging circuit in the second wheel detection module is a fault point, otherwise the next step is performed; S002, if the second phase difference parameter is normal, it is estimated that the receiving signal filtering circuit in the second wheel detection module is a fault point, otherwise the next step is performed; S003, if the eighth amplitude parameter and the sixth frequency parameter are normal, it is estimated that the receiving signal phase judging circuit in the second wheel detection module is a fault point, otherwise the next step is performed; S004、if the monitoring information indicates that both the seventh amplitude parameter and the fifth frequency parameter are normal, it is estimated that the second wheel detection module receives signal amplification circuit or the second receiving magnetic head or the second transmitting magnetic head is the fault point, otherwise the next step is executed; S005、if the monitoring information indicates that the fourth frequency parameter is normal, it is estimated that the transmitting signal amplification circuit in the second wheel detection module is the fault point, otherwise the next step is executed; S006、if the monitoring information indicates that the sixth amplitude parameter is normal, it is estimated that the transmitting signal generation circuit in the second wheel detection module is the fault point, otherwise it is estimated that the power supply circuit in the second wheel detection module is the fault point.

Images