CN112849207A - Shaft temperature detection system and shaft temperature detection method - Google Patents
Shaft temperature detection system and shaft temperature detection method Download PDFInfo
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- CN112849207A CN112849207A CN202110022371.XA CN202110022371A CN112849207A CN 112849207 A CN112849207 A CN 112849207A CN 202110022371 A CN202110022371 A CN 202110022371A CN 112849207 A CN112849207 A CN 112849207A
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- B61—RAILWAYS
- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
- B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
- B61K9/04—Detectors for indicating the overheating of axle bearings and the like, e.g. associated with the brake system for applying the brakes in case of a fault
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Abstract
The disclosure relates to the technical field of rail transit, in particular to an axle temperature detection system and an axle temperature detection method, wherein the system comprises: the sampling resistor is arranged at a position to be detected of the vehicle body and used for detecting a shaft temperature signal of the position to be detected; the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels; the main control board is connected with the acquisition board and used for determining whether the shaft temperature is abnormal or not according to the shaft temperature signals acquired by the acquisition board and a preset shaft temperature curve; detecting a shaft temperature signal of a position to be detected through a sampling resistor; the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels; the main control board determines whether the shaft temperature is abnormal or not according to the shaft temperature signal acquired by the acquisition board and a preset shaft temperature curve; can form redundant collection through two at least collection passageways to make the board of gathering gather the axle temperature signal that sampling resistance detected, and then promote the reliability that the axle temperature detected.
Description
Technical Field
The disclosure relates to the technical field of rail transit, in particular to a shaft temperature detection system and a shaft temperature detection method.
Background
Rail vehicles are the main vehicles of the present generation and play a great role in passenger and freight transportation. The axle temperature detection system belongs to the traffic safety equipment, and has very high reliability requirement. If false alarm occurs, the train can be stopped, and the safe operation of the train is influenced. In order to prevent accidents such as axle burning caused by internal faults of wheel set bearings of the railway vehicle, a temperature sensor and a temperature acquisition circuit for monitoring the bearing state of the axle box are arranged on the side surface of each axle box body. For example, a temperature acquisition circuit (acquisition module) disposed in a vehicle chassis has 48 channels, and each channel needs to use a PT100 resistance conversion chip, so that the cost of the temperature acquisition circuit is high.
In addition, when the axle temperature is measured, a temperature sensor is arranged at the bottom of the vehicle body, and a control device such as a temperature acquisition circuit is arranged in a carriage. The distance between the temperature sensor and the temperature acquisition circuit is far, and a connector joint inevitably exists between the temperature sensor and the temperature acquisition circuit. Since the resistance signal is an analog signal, the contact resistance of the connector contacts that are mixed into the temperature resistance of the sensor transitions cannot be distinguished. Because each train has thousands of joints and any one joint is abnormal, misjudgment can be caused, so the shaft temperature detection scheme with higher cost has the problem of lower reliability, thereby causing the problem of false alarm/missed alarm temperature in the running process of the train. For example, the electrical signal of the temperature sensor is not accurately transmitted to the temperature acquisition circuit, which leads to the problem of false alarm of temperature, thereby affecting the detection effect.
In summary, there is a need in the art for a shaft temperature detection scheme to reduce the detection cost and improve the detection reliability.
Disclosure of Invention
The present disclosure provides a shaft temperature detection system and a shaft temperature detection method to reduce detection cost and improve detection reliability.
In a first aspect, the present disclosure provides a shaft temperature detection system, comprising:
the sampling resistor is arranged at a position to be detected of the vehicle body and used for detecting a shaft temperature signal of the position to be detected;
the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels;
and the main control board is connected with the acquisition board and used for determining whether the shaft temperature is abnormal or not according to the shaft temperature signals acquired by the acquisition board and a preset shaft temperature curve.
In some embodiments, the collection plate, comprises;
the analog switch chip is connected with the sampling resistor;
the acquisition module is connected between the analog switch chip and the main control board;
the main control board is further used for generating control signals and sending the control signals to the analog switch chip, so that the analog switch chip forms at least two collecting channels between the sampling resistor and the collecting module.
In some embodiments, when the collecting board collects the shaft temperature signal detected by the sampling resistor through two collecting channels, the analog switch chip includes:
one end of the first switch is connected to the first end of the sampling resistor, and the other end of the first switch is connected to the first input end of the acquisition module;
one end of the third switch is connected to the first end of the sampling resistor, and the other end of the third switch is connected to the second input end of the acquisition module;
one end of the second switch is connected to a connecting line between the first switch and the acquisition module, and the other end of the second switch is connected to a connecting line between the third switch and the acquisition module;
one end of the fourth switch is connected to the second end of the sampling resistor, and the other end of the fourth switch is connected to the third input end of the acquisition module;
one end of the sixth switch is connected to the second end of the sampling resistor, and the other end of the sixth switch is connected to the fourth input end of the acquisition module;
one end of the fifth switch is connected to a connecting line between the fourth switch and the acquisition module, and the other end of the fifth switch is connected to a connecting line between the sixth switch and the acquisition module;
when the first switch, the second switch, the fourth switch and the fifth switch are closed and the third switch and the sixth switch are opened, a first path of collecting channel is formed;
and when the second switch, the third switch, the fifth switch and the sixth switch are closed and the first switch and the fourth switch are disconnected, a second path of acquisition channel is formed.
In some embodiments, the sampling resistor comprises PT100 or PT 1000.
In some embodiments, when the sampling resistor is multiple and the collecting plate is multiple, the same collecting plate collects the shaft temperature signal of the same sampling resistor through at least two collecting channels.
In a second aspect, the present disclosure provides a shaft temperature detection method applied to the shaft temperature detection system of the first aspect, the method including:
detecting a shaft temperature signal of a position to be detected by a sampling resistor;
the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels;
and the main control board determines whether the shaft temperature is abnormal or not according to the shaft temperature signal acquired by the acquisition board and a preset shaft temperature curve.
In some embodiments, the step of acquiring, by the acquisition board, the shaft temperature signal detected by the sampling resistor through at least two acquisition channels includes:
and each path of acquisition channel is conducted one by one, so that the acquisition board acquires the shaft temperature signal detected by the sampling resistor through each path of acquisition channel.
In some embodiments, before the step of detecting the shaft temperature signal of the position to be detected by the sampling resistor, obtaining a shaft temperature signal compensation value includes:
the first switch, the third switch, the fourth switch and the sixth switch are closed, the second switch and the fifth switch are disconnected, and first axial temperature signals collected by the first input end, the second input end, the third input end and the fourth input end of the collection module are obtained;
when the first switch, the second switch, the fourth switch and the fifth switch are closed and the third switch and the sixth switch are disconnected to form a first path of acquisition channel, acquiring second shaft temperature signals acquired by a second input end and a fourth input end of the acquisition module;
closing the second switch, the third switch, the fifth switch and the sixth switch, and acquiring second shaft temperature signals acquired by a first input end and a third input end of the acquisition module when the first switch and the fourth switch are disconnected to form a second path of acquisition channel;
and calculating the difference value of the first shaft temperature signal and the second shaft temperature signal acquired by each input end of the acquisition module to be used as the shaft temperature signal compensation value of each input end of the acquisition module.
In some embodiments, the step of determining whether the shaft temperature is abnormal by the main control board according to the shaft temperature signal collected by the collecting board and a preset shaft temperature curve includes:
determining second shaft temperature signals collected by the input ends of the collection modules when a first collection channel and a second collection channel are formed;
in the second shaft temperature signals collected by the first input end and the second input end of the collection module, the second shaft temperature signal with the minimum deviation with a preset shaft temperature curve is used as a first target temperature;
in the second shaft temperature signals collected by the third input end and the fourth input end of the collection module, the second shaft temperature signal with the minimum deviation with the preset shaft temperature curve is used as a second target temperature;
obtaining a first shaft temperature detection value by using the first target temperature and the corresponding shaft temperature signal compensation value;
obtaining a second shaft temperature detection value by using the second target temperature and the corresponding shaft temperature signal compensation value;
and comparing the first shaft temperature detection value and the second shaft temperature detection value with a preset shaft temperature curve to determine whether the shaft temperature is abnormal.
In some embodiments, the sampling resistor detects an axle temperature signal of the position to be detected, including:
the sampling resistor detects temperature changes of the position to be detected and converts the temperature changes into resistance changes.
The axle temperature detection scheme provided by the disclosure comprises a sampling resistor, a signal processing circuit and a signal processing circuit, wherein the sampling resistor is arranged at a position to be detected of a vehicle body and used for detecting an axle temperature signal of the position to be detected; the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels; the main control board is connected with the acquisition board and used for determining whether the shaft temperature is abnormal or not according to the shaft temperature signals acquired by the acquisition board and a preset shaft temperature curve; detecting a shaft temperature signal of a position to be detected through a sampling resistor; the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels; the main control board determines whether the shaft temperature is abnormal or not according to the shaft temperature signal acquired by the acquisition board and a preset shaft temperature curve; can form redundant collection through two at least collection passageways to make the board of gathering gather the axle temperature signal that sampling resistance detected, and then promote the reliability that the axle temperature detected.
Drawings
The present disclosure will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings:
fig. 1 is a block diagram of a shaft temperature detection system according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a shaft temperature detection system according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a shaft temperature detection system according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a shaft temperature detection method according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of a shaft temperature detection method according to an embodiment of the present disclosure;
fig. 6 is a schematic flow chart of a shaft temperature detection method according to an embodiment of the present disclosure;
fig. 7 is a schematic flow chart of a shaft temperature detection method according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram illustrating a two-wire measurement principle of a temperature conversion chip according to an embodiment of the present disclosure;
fig. 9 is a principle of the temperature conversion chip provided in the embodiment of the present disclosure when a four-wire system measurement is adopted.
In the drawings, like parts are designated with like reference numerals, and the drawings are not drawn to scale.
Detailed Description
In order to make those skilled in the art better understand the disclosure and how to implement the disclosure by applying technical means to solve the technical problems and achieve the corresponding technical effects, the technical solutions in the embodiments of the disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the disclosure, and it is obvious that the described embodiments are only partial embodiments of the disclosure, but not all embodiments. The embodiments and the features of the embodiments of the present disclosure can be combined with each other without conflict, and the formed technical solutions are all within the protection scope of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Example one
Fig. 1 is a block diagram of a shaft temperature detection system according to an embodiment of the present disclosure. As shown in fig. 1, a shaft temperature detecting system includes:
the sampling resistor is arranged at a position to be detected of the vehicle body and used for detecting a shaft temperature signal of the position to be detected;
the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels;
and the main control board is connected with the acquisition board and used for determining whether the shaft temperature is abnormal or not according to the shaft temperature signals acquired by the acquisition board and a preset shaft temperature curve.
The axle temperature detection system provided by the embodiment detects an axle temperature signal of a position to be detected through the sampling resistor arranged at the position to be detected of the vehicle body; then, collecting the shaft temperature signal detected by the sampling resistor through at least two collecting channels by a collecting plate; the main control board determines whether the shaft temperature is abnormal or not according to the shaft temperature signal acquired by the acquisition board and a preset shaft temperature curve; this embodiment can carry out the redundancy collection through two at least collection passageways to same sampling resistor to make the board of gathering reliably gather the axle temperature signal, and then promote the reliability that the axle temperature detected.
Example two
On the basis of the above embodiments, fig. 2 is a block diagram of a shaft temperature detection system provided in the embodiments of the present disclosure. As shown in fig. 2, the sampling resistor includes PT100 or PT 1000.
When the sampling resistor is multiple (R1 … … Rn) and the acquisition board is multiple, the same acquisition board acquires the shaft temperature signal of the same sampling resistor through at least two acquisition channels.
In this embodiment, each of the collection plates corresponds to a plurality of sampling resistors, and the number of the collection plates to be configured is determined according to the number of the sampling resistors. The sampling resistor converts temperature change into resistance change, and the collecting board collects the resistance value of the sampling resistor and sends the resistance value to the main control board for processing through a backboard bus (such as an SPI communication bus). The main control board converts the resistance value into a temperature value, and simultaneously performs logical operation processing to judge whether the temperature change trend and the temperature value reach an alarm condition, and when the alarm condition is reached, generates an alarm signal and informs a driver to process.
This embodiment is through making same collection board gather the axle temperature signal of same sampling resistor through two at least collection passageways to form redundant collection, and then can make the collection board reliably gather the axle temperature signal of sampling resistor.
Because the temperature signal is a slowly changing signal, this embodiment can make each acquisition board correspond to a plurality of sampling resistors, realizes that an acquisition board is to setting up in the signal acquisition of the sampling resistor of a plurality of differences position of waiting to detect.
EXAMPLE III
On the basis of the above embodiments, fig. 3 is a block diagram of a shaft temperature detection system provided in the embodiments of the present disclosure. As shown in fig. 3, an acquisition board comprising;
the analog switch chip is connected with the sampling resistor;
the acquisition module is connected between the analog switch chip and the main control board;
the main control board is also used for generating control signals and sending the control signals to the analog switch chip so that the analog switch chip forms at least two acquisition channels between the sampling resistor and the acquisition module.
In this embodiment, at least two redundant acquisition channels are formed between the sampling resistor and the acquisition module through the analog switch chip, so that the acquisition module acquires the shaft temperature signal through different input ends.
In some embodiments, the collecting board collects the shaft temperature signal detected by the sampling resistor through two collecting channels, and at this time, as shown in fig. 3, the analog switch chip includes:
one end of the first switch K1 is connected to the first end of the sampling resistor R1, and the other end is connected to the first input end a of the acquisition module;
one end of the third switch K3 is connected to the first end of the sampling resistor R1, and the other end is connected to the second input end b of the acquisition module;
one end of the second switch K2 is connected to a connecting line between the first switch K1 and the acquisition module, and the other end of the second switch K2 is connected to a connecting line between the third switch K3 and the acquisition module;
one end of the fourth switch K4 is connected to the second end of the sampling resistor R1, and the other end of the fourth switch K4 is connected to the third input end c of the acquisition module;
one end of the sixth switch K6 is connected to the second end of the sampling resistor R1, and the other end is connected to the fourth input end d of the acquisition module;
one end of the fifth switch K5 is connected to the connection line between the fourth switch K4 and the acquisition module, and the other end of the fifth switch K5 is connected to the connection line between the sixth switch K6 and the acquisition module;
a first path of acquisition channel is formed when the first switch K1, the second switch K2, the fourth switch K4 and the fifth switch K5 are closed and the third switch K3 and the sixth switch K6 are opened;
and when the second switch K2, the third switch K3, the fifth switch K5 and the sixth switch K6 are closed and the first switch K1 and the fourth switch K4 are opened, a second channel of acquisition channels is formed.
Fig. 4 is a schematic flow chart of a shaft temperature detection method according to an embodiment of the present disclosure. As shown in fig. 4, as for the two-wire measurement, the first switch K1 and the third switch K3, the fourth switch K4 and the sixth switch K6 are redundant to each other, and the temperature signal detected by the sampling resistor is obtained by selecting the switch combination of (K1, K2, K3), (K4, K5, K6) by the control signal of the main control board. The same sampling resistor is subjected to redundant sampling through two acquisition channels, a first switch K1, a second switch K2, a fourth switch K4 and a fifth switch K5 are firstly closed through a control signal of a main control panel, a third switch K3 and a sixth switch K6 are disconnected, and a temperature signal measured by the sampling resistor is obtained at the moment; and then the second switch K2, the third switch K3, the fifth switch K5 and the sixth switch K6 are closed, the first switch K1 and the fourth switch K4 are opened, and at the moment, the temperature signal measured by the sampling resistor is obtained.
In some embodiments, the acquisition module is a temperature conversion chip, and in practical applications, the temperature conversion chip with the model number MAX31865 may be used to acquire the temperature signal measured by the sampling resistor.
In the related art, the principle of the temperature conversion chip when the two-wire system measurement is adopted is shown in fig. 8, and the principle of the temperature conversion chip when the four-wire system measurement is adopted is shown in fig. 9. When the rail vehicle actually runs, if the temperature conversion chip adopts the four-wire system to measure the temperature signal, when one of the four cables is broken, the resistance value obtained by sampling is unreliable, so the embodiment adopts the redundancy measurement of the two-wire system measurement scheme. Meanwhile, each sampling resistor is subjected to redundant acquisition, and an abnormal resistance value is abandoned after signal processing is carried out on the main control board, so that false alarm can be effectively reduced, and the comfort level of user experience is improved.
Example four
On the basis of the foregoing embodiment, fig. 5 is a schematic flow chart of a shaft temperature detection method provided in the embodiment of the present disclosure. As shown in fig. 5, a shaft temperature detection method is applied to the shaft temperature detection system, and the method includes:
s100, detecting a shaft temperature signal of a position to be detected by a sampling resistor;
s200, collecting a shaft temperature signal detected by the sampling resistor through at least two collecting channels by a collecting board;
and S300, determining whether the shaft temperature is abnormal or not by the main control board according to the shaft temperature signal collected by the collecting board and a preset shaft temperature curve.
Wherein, the sampling resistance detects the axle temperature signal of waiting to detect the position, includes:
the sampling resistor detects temperature changes of the position to be detected and converts the temperature changes into resistance changes.
According to the shaft temperature detection method provided by the embodiment, a shaft temperature signal of a position to be detected is detected through a sampling resistor, and the temperature change of the position to be detected is converted into the resistance change; the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels; the main control board determines whether the shaft temperature is abnormal or not according to the shaft temperature signal acquired by the acquisition board and a preset shaft temperature curve; can form redundant collection through two at least collection passageways to make the board of gathering gather the axle temperature signal that sampling resistance detected, and then promote the reliability that the axle temperature detected.
EXAMPLE five
On the basis of the embodiment, the step of collecting the shaft temperature signal detected by the sampling resistor by the collecting plate through at least two collecting channels comprises the following steps:
and each path of acquisition channel is conducted one by one, so that the acquisition board acquires the shaft temperature signal detected by the sampling resistor through each path of acquisition channel.
This embodiment is through making same collection board gather the axle temperature signal of same sampling resistor through two at least collection passageways to form redundant collection, and then can make the collection board reliably gather the axle temperature signal of sampling resistor.
Because the temperature signal is the slowly changing signal, therefore this embodiment is through making each collection board correspond to a plurality of sampling resistance to make multichannel collection channel can the timesharing multiplex set up the collection module (temperature conversion chip) on same collection board, thereby reduced the cost that the axle temperature detected.
EXAMPLE six
On the basis of the above embodiment, before the step of detecting the shaft temperature signal of the position to be detected by the sampling resistor, obtaining a compensation value of the shaft temperature signal, includes:
the first switch K1, the third switch K3, the fourth switch K4 and the sixth switch K6 are closed, the second switch K2 and the fifth switch K5 are opened, and first axial temperature signals acquired by a first input end a, a second input end b, a third input end c and a fourth input end d of the acquisition module are acquired;
when the first switch K1, the second switch K2, the fourth switch K4 and the fifth switch K5 are closed and the third switch K3 and the sixth switch K6 are opened to form a first path of acquisition channel, acquiring second shaft temperature signals acquired by a second input end b and a fourth input end d of the acquisition module;
closing a second switch K2, a third switch K3, a fifth switch K5 and a sixth switch K6, and acquiring second shaft temperature signals acquired by a first input end a and a third input end c of an acquisition module when a first switch K1 and a fourth switch K4 are disconnected to form a second path of acquisition channel;
and calculating the difference value of the first shaft temperature signal and the second shaft temperature signal acquired by each input end of the acquisition module to be used as the shaft temperature signal compensation value of each input end of the acquisition module.
The acquisition board and the main control board are positioned in the case, and because the installation position of the case and the length of a connecting line from the sampling resistor to the case are different, the resistors on the electronic cross switch and the connecting cable can be brought into the measured resistance value by adopting a two-wire system measurement mode, so that a system error is caused, namely, the system error exists in a second shaft temperature signal obtained by the two-wire system measurement relative to a real shaft temperature signal. In order to eliminate the system error generated during the two-wire system measurement, when the case is delivered from a factory, the compensation value for the two-wire system measurement is obtained according to the measurement value of the four-wire system measurement and the measurement value of the two-wire system measurement, so that the two-wire system measurement result is initialized and calibrated. On the basis, the shaft temperature signal compensation value obtained during the initialization calibration compensates the two-wire system measurement result, and the system error caused by the electronic cross switch and the connecting cable can be eliminated. Namely, errors caused by cables are eliminated through comparison of resistance difference values of two-wire system acquisition modes and four-wire system acquisition modes.
When the calibration is initialized, the first switch K1, the third switch K3, the fourth switch K4 and the sixth switch K6 are closed, and the second switch K2 and the fifth switch K5 are opened, so that the real temperature resistance values of all sampling resistors are obtained by adopting four-wire system measurement and are used as first shaft temperature signals; two-wire system measurement is adopted to obtain shaft temperature signals of the sampling resistors in the two acquisition channels as second shaft temperature signals; and calculating the difference value between the first shaft temperature signal and the second shaft temperature signal acquired by each input end of the acquisition module to be used as the shaft temperature signal compensation value of each input end of the acquisition module, namely obtaining the shaft temperature signal compensation values of the first input end a to the fourth input end d of the acquisition module through the difference value between the first shaft temperature signal and the second shaft temperature signal.
When the rail vehicle actually runs, the acquisition module redundantly acquires the resistance value of the same sampling resistor from the two acquisition channels in a two-wire system measurement mode, and compensates the resistance value of the corresponding input end by using the shaft temperature signal compensation value to obtain a real resistance value.
The four-wire system measurement mode is, for example, a temperature sensor (e.g., a sampling resistor) is installed at a position (e.g., under a vehicle) where the shaft temperature needs to be measured, and the temperature sensor adopts a four-wire system output mode. Two cables are respectively led out from two ends of the temperature sensor and connected to four input points of an acquisition module of the acquisition board, namely a first input end a, a second input end b, a third input end c and a fourth input end d. Signals of two point positions a and b at one end of the temperature sensor are input to a first input end a and a second input end b of the acquisition module through cross switches K1 and K3, signals of two point positions c and d at the other end of the PT100 are output to a third input end c and a fourth input end d of the acquisition module through K4 and K6, and a first axial temperature signal can be obtained through four-wire system measurement.
The two-wire measurement is performed, for example, in such a manner that the first switch K1 and the third switch K3 are redundant to each other, and the fourth switch K4 and the sixth switch K6 are redundant to each other. And controlling and selecting a (K1, K2, K3) switch combination or a (K4, K5, K6) switch combination through a signal processing module of the main control board to measure the resistance value of the sampling resistor as a second shaft temperature signal. The acquisition module completes the resistance value conversion and then sends the resistance value conversion to the main control board through a backboard bus (such as an SPI communication bus). The PT100 sampling resistor R1 is connected to the temperature conversion chip MAX31865 in a two-wire mode, and the temperature conversion chip sends the resistance value to a signal processing module (such as an MCU chip) of an external main control board for processing through an SPI communication interface after completing collection, so that the cost is reduced and the occupied space is reduced compared with the conventional discrete circuit.
When the railway vehicle actually runs, if four-wire system measurement is adopted, when one of the four cables is broken, the resistance value obtained by sampling is unreliable; by adopting the two-wire redundant measurement scheme provided by the embodiment, as the same sampling resistor is subjected to redundant sampling, even if one of the four cables is broken, the resistance value can be obtained from the other sampling channel, so that the reliability of temperature detection is improved.
In addition, carry out the redundancy collection to each sampling resistance, discern and abandon unusual resistance value after signal processing, can effectively reduce the wrong report alert, promote user experience's comfort level.
It can be understood that the embodiment discloses a redundant wiring scheme based on two-wire system measurement of PT100 resistance, and the redundant wiring scheme based on three-wire system measurement of PT100 resistance is similar to the above scheme, and is not described herein again.
In addition, the temperature acquisition chip is connected with only one temperature sensor in the same time period through the cross switch, and different temperature sensors are circularly connected in different time periods, so that the resistance values of the plurality of temperature sensors can be acquired by one acquisition chip in different time periods. For example, 48 paths of temperature signals of the vehicle chassis need to be collected, the production cost of the whole chassis is higher, and the time division multiplexing is adopted, so that the production cost can be effectively reduced. In some technical solutions, 1 PT100 temperature acquisition chip is required for each 1 way of AD sampling, and in this embodiment, 1 PT100 temperature acquisition chip is used for 1 acquisition board (for example, including 8 ways), and the acquisition boards are time-division multiplexed, thereby effectively reducing the production cost.
EXAMPLE seven
On the basis of the foregoing embodiment, fig. 6 is a schematic flow chart of a shaft temperature detection method provided in the embodiment of the present disclosure. As shown in fig. 6, the method includes initializing an acquisition module, completing temperature acquisition of each sampling resistor, analyzing and processing two temperature values acquired by the same sampling resistor, selecting a temperature value with good reliability, removing system errors, judging whether to output an alarm according to an axle temperature curve alarm logic, and finally circulating to the step of completing temperature acquisition of each sampling resistor before completing temperature acquisition of each sampling resistor to continue executing the method.
As shown in fig. 7, the step S300 of determining whether the shaft temperature is abnormal by the main control board according to the shaft temperature signal collected by the collecting board and the preset shaft temperature curve includes:
s301, determining second shaft temperature signals acquired by input ends of the acquisition modules when a first acquisition channel and a second acquisition channel are formed;
step S302, in the second shaft temperature signals collected by the first input end and the second input end of the collection module, the second shaft temperature signal with the minimum deviation with a preset shaft temperature curve is used as a first target temperature;
step S303, in the second shaft temperature signals collected by the third input end and the fourth input end of the collection module, taking the second shaft temperature signal with the minimum deviation from a preset shaft temperature curve as a second target temperature;
step S304, obtaining a first axle temperature detection value by using the first target temperature and the axle temperature signal compensation value corresponding to the first target temperature;
step S305, obtaining a second shaft temperature detection value by using the second target temperature and the corresponding shaft temperature signal compensation value;
step S306, comparing the first shaft temperature detection value and the second shaft temperature detection value with a preset shaft temperature curve to determine whether the shaft temperature is abnormal.
The main control board receives the second shaft temperature signals, converts the second shaft temperature signals into temperature values, selects a temperature value with good reliability (the deviation from the preset shaft temperature curve is minimum) from the temperature values corresponding to the two second shaft temperature signals of the same acquisition channel according to a preset shaft temperature curve established according to the change characteristics of the shaft temperature curve of the motor train unit, and compensates the temperature value with good reliability based on a shaft temperature signal compensation value obtained by four-wire system measurement, so that the resistance deviation caused by cables and analog switches can be eliminated by utilizing the first shaft temperature signals. On the basis, whether the compensated temperature value is abnormal or not is judged according to the characteristics of the shaft temperature curve, and a corresponding alarm is sent out. Since the present embodiment removes a signal with poor reliability, a false alarm can be prevented.
In the embodiments provided in the present disclosure, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It should be noted that, in the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the recitation of an element by the phrase "comprising an … …" does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element.
Although the embodiments disclosed in the present disclosure are described above, the above description is only for the convenience of understanding the present disclosure, and is not intended to limit the present disclosure. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (10)
1. A shaft temperature detection system, comprising:
the sampling resistor is arranged at a position to be detected of the vehicle body and used for detecting a shaft temperature signal of the position to be detected;
the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels;
and the main control board is connected with the acquisition board and used for determining whether the shaft temperature is abnormal or not according to the shaft temperature signals acquired by the acquisition board and a preset shaft temperature curve.
2. The system of claim 1, wherein the collection plate comprises;
the analog switch chip is connected with the sampling resistor;
the acquisition module is connected between the analog switch chip and the main control board;
the main control board is further used for generating control signals and sending the control signals to the analog switch chip, so that the analog switch chip forms at least two collecting channels between the sampling resistor and the collecting module.
3. The system of claim 2, wherein when the collecting board collects the shaft temperature signal detected by the sampling resistor through two collecting channels, the analog switch chip comprises:
one end of the first switch is connected to the first end of the sampling resistor, and the other end of the first switch is connected to the first input end of the acquisition module;
one end of the third switch is connected to the first end of the sampling resistor, and the other end of the third switch is connected to the second input end of the acquisition module;
one end of the second switch is connected to a connecting line between the first switch and the acquisition module, and the other end of the second switch is connected to a connecting line between the third switch and the acquisition module;
one end of the fourth switch is connected to the second end of the sampling resistor, and the other end of the fourth switch is connected to the third input end of the acquisition module;
one end of the sixth switch is connected to the second end of the sampling resistor, and the other end of the sixth switch is connected to the fourth input end of the acquisition module;
one end of the fifth switch is connected to a connecting line between the fourth switch and the acquisition module, and the other end of the fifth switch is connected to a connecting line between the sixth switch and the acquisition module;
when the first switch, the second switch, the fourth switch and the fifth switch are closed and the third switch and the sixth switch are opened, a first path of collecting channel is formed;
and when the second switch, the third switch, the fifth switch and the sixth switch are closed and the first switch and the fourth switch are disconnected, a second path of acquisition channel is formed.
4. The system of claim 1, wherein the sampling resistor comprises PT100 or PT 1000.
5. The system of claim 1, wherein when the sampling resistor is multiple and the collecting plate is multiple, the same collecting plate collects the shaft temperature signal of the same sampling resistor through at least two collecting channels.
6. A shaft temperature detection method applied to the shaft temperature detection system according to any one of claims 1 to 5, the method comprising:
detecting a shaft temperature signal of a position to be detected by a sampling resistor;
the acquisition board acquires the shaft temperature signal detected by the sampling resistor through at least two acquisition channels;
and the main control board determines whether the shaft temperature is abnormal or not according to the shaft temperature signal acquired by the acquisition board and a preset shaft temperature curve.
7. The method as claimed in claim 6, wherein the step of collecting the shaft temperature signal detected by the sampling resistor by the collecting board through at least two collecting channels comprises:
and each path of acquisition channel is conducted one by one, so that the acquisition board acquires the shaft temperature signal detected by the sampling resistor through each path of acquisition channel.
8. The method of claim 6, wherein obtaining the shaft temperature signal compensation value prior to the step of detecting the shaft temperature signal of the location to be detected by the sampling resistor comprises:
the first switch, the third switch, the fourth switch and the sixth switch are closed, the second switch and the fifth switch are disconnected, and first axial temperature signals collected by the first input end, the second input end, the third input end and the fourth input end of the collection module are obtained;
when the first switch, the second switch, the fourth switch and the fifth switch are closed and the third switch and the sixth switch are disconnected to form a first path of acquisition channel, acquiring second shaft temperature signals acquired by a second input end and a fourth input end of the acquisition module;
closing the second switch, the third switch, the fifth switch and the sixth switch, and acquiring second shaft temperature signals acquired by a first input end and a third input end of the acquisition module when the first switch and the fourth switch are disconnected to form a second path of acquisition channel;
and calculating the difference value of the first shaft temperature signal and the second shaft temperature signal acquired by each input end of the acquisition module to be used as the shaft temperature signal compensation value of each input end of the acquisition module.
9. The method of claim 8, wherein the step of determining whether the shaft temperature is abnormal by the main control board according to the shaft temperature signal collected by the collecting board and a preset shaft temperature curve comprises:
determining second shaft temperature signals collected by the input ends of the collection modules when a first collection channel and a second collection channel are formed;
in the second shaft temperature signals collected by the first input end and the second input end of the collection module, the second shaft temperature signal with the minimum deviation with a preset shaft temperature curve is used as a first target temperature;
in the second shaft temperature signals collected by the third input end and the fourth input end of the collection module, the second shaft temperature signal with the minimum deviation with the preset shaft temperature curve is used as a second target temperature;
obtaining a first shaft temperature detection value by using the first target temperature and the corresponding shaft temperature signal compensation value;
obtaining a second shaft temperature detection value by using the second target temperature and the corresponding shaft temperature signal compensation value;
and comparing the first shaft temperature detection value and the second shaft temperature detection value with a preset shaft temperature curve to determine whether the shaft temperature is abnormal.
10. The method of claim 6, wherein the sampling resistor detects an axial temperature signal of the location to be detected, comprising:
the sampling resistor detects temperature changes of the position to be detected and converts the temperature changes into resistance changes.
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| CN204527212U (en) * | 2015-03-09 | 2015-08-05 | 北京纵横机电技术开发公司 | The axis temperature alarming equipment of EMU |
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