CN210198728U - Signal preprocessor circuit, signal acquisition processing device and fault diagnosis system - Google Patents
Signal preprocessor circuit, signal acquisition processing device and fault diagnosis system Download PDFInfo
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- CN210198728U CN210198728U CN201921403900.5U CN201921403900U CN210198728U CN 210198728 U CN210198728 U CN 210198728U CN 201921403900 U CN201921403900 U CN 201921403900U CN 210198728 U CN210198728 U CN 210198728U
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Abstract
The utility model discloses a signal preprocessor circuit, signal acquisition processing apparatus and failure diagnosis system, signal preprocessor circuit transmits the code signal to the microprocessing unit through multichannel analog switch, the microprocessing unit switches according to code signal control multichannel analog switch, the first sampling signal of first class sensor output transmits to the signal transmission channel of the diagnosis host computer through multichannel analog switch switching timesharing; and a second sampling signal output by the second type sensor is transmitted to a signal transmission channel of the diagnosis host computer through a serial interface of the microprocessor unit and the communication unit. Therefore, the utility model provides a signal preprocessor circuit, signal acquisition processing apparatus and failure diagnosis system can carry out the time-sharing transmission to the diagnosis host computer after the preliminary treatment to the signal that each way sensor gathered to reduce transmission cable quantity, improve signal transmission's reliability.
Description
Technical Field
The utility model relates to a signal acquisition handles technical field, in particular to signal preprocessor circuit, signal acquisition processing apparatus and fault diagnosis system.
Background
With the rapid development of the high-speed railway, higher requirements are also provided for the safety monitoring of the running gear of the motor train unit. In order to ensure the running safety of the high-speed motor train unit, sensors are additionally arranged on key parts of the running gear, such as an axle box, a gear box, a motor and the like, and signals of vibration, impact, temperature and the like are collected and transmitted to a host machine, so that the fault on-line diagnosis and analysis of the key parts of the running gear are realized.
At present, the types of the additionally arranged sensors are different, the total number of the sensors is large, the temperature sensors need to transmit temperature signals to a shaft temperature monitoring system, and the vibration impact sensors need to transmit vibration and impact signals to a walking part monitoring system, so that the field wiring process is complex. And because the cable from the temperature sensor to the shaft temperature monitoring system is too long, the cable resistance can influence the temperature measurement precision.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a signal preprocessor circuit, signal acquisition processing apparatus and failure diagnosis system can carry out the time-sharing transmission to the diagnosis host computer after the preliminary treatment to the signal that each way sensor gathered to reduce transmission cable quantity, improve signal transmission's reliability.
The utility model discloses a first aspect provides a signal preprocessor circuit, include: the system comprises a multi-path analog switch unit, a micro-processing unit and a communication unit;
the first input end of the multi-path analog switch unit is connected with the output end of the first sampling signal, the first output end of the multi-path analog switch unit is connected with the signal transmission channel, the second input end of the multi-path analog switch unit is connected with the output end of the coding signal, and the second output end and the control end of the multi-path analog switch unit are both connected with the micro-processing unit;
the serial interface input end of the micro-processing unit is connected with the output end of the second sampling signal, and the serial interface output end of the micro-processing unit is connected with one end of the communication unit;
the other end of the communication unit is connected with the signal transmission channel.
Preferably, the sampling circuit further comprises a first analog-to-digital conversion unit, and an input end of a serial interface of the micro-processing unit is connected with an output end of the second sampling signal through the first analog-to-digital conversion unit.
Preferably, the sampling circuit further comprises a first filtering unit and a first differential amplifying unit, an input end of the first filtering unit is connected to an output end of the second sampling signal, an output end of the first filtering unit is connected to an input end of the first differential amplifying unit, and an output end of the first differential amplifying unit is connected to an input end of the first analog-to-digital converting unit.
Preferably, the multi-channel analog switch further comprises a current-voltage conversion unit and a second analog-to-digital conversion unit, and the first output end of the multi-channel analog switch unit is connected with the signal transmission channel through the current-voltage conversion unit, the second analog-to-digital conversion unit, the micro-processing unit and the communication unit respectively.
Preferably, the current-voltage conversion circuit further comprises a second filtering unit and a second differential amplifying unit, an input end of the second filtering unit is connected to an output end of the current-voltage conversion unit, an output end of the second filtering unit is connected to an input end of the second differential amplifying unit, and an output end of the second differential amplifying unit is connected to an input end of the second analog-to-digital conversion unit.
Preferably, the microprocessor unit is a single chip microcomputer or an MCU.
Preferably, the communication unit is an RS485 communication unit.
Preferably, a power conversion unit is further included.
The utility model discloses the second aspect provides a signal acquisition processing apparatus, including sensor and above-mentioned signal preprocessor circuit.
The utility model discloses the third aspect provides a fault diagnosis system, including diagnosis host computer and above-mentioned signal acquisition processing apparatus.
The utility model provides a signal preprocessor circuit, signal acquisition processing apparatus and failure diagnosis system, signal preprocessor circuit pass through multichannel analog switch with code signal transmission to little processing unit, little processing unit switches according to code signal control multichannel analog switch, the first sampling signal of first class sensor output transmits to the signal transmission passageway of diagnosis host computer through multichannel analog switch switching timesharing; and a second sampling signal output by the second type sensor is transmitted to a signal transmission channel of the diagnosis host computer through a serial interface of the microprocessor unit and the communication unit. Therefore, the utility model provides a signal preprocessor circuit, signal acquisition processing apparatus and failure diagnosis system can carry out the time-sharing transmission to the diagnosis host computer after the preliminary treatment to the signal that each way sensor gathered to reduce transmission cable quantity, improve signal transmission's reliability.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a signal pre-processor circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another signal pre-processor circuit according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of a plurality of or a plurality of is two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for understanding and reading the contents disclosed in the specification, and are not used for limiting the conditions that the present application can implement, so the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the technical content disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
The embodiment of the utility model provides an adopt progressive mode to write.
Referring to fig. 1, an embodiment of the present invention provides a schematic structural diagram of a signal pre-processor circuit. The signal pre-processor circuit comprises: the system comprises a multi-path analog switch unit, a micro-processing unit and a communication unit; the first input end of the multi-path analog switch unit is connected with the output end of the first sampling signal, the first output end of the multi-path analog switch unit is connected with the signal transmission channel, the second input end of the multi-path analog switch unit is connected with the output end of the coding signal, and the second output end and the control end of the multi-path analog switch unit are both connected with the micro-processing unit; the serial interface input end of the micro-processing unit is connected with the output end of the second sampling signal, and the serial interface output end of the micro-processing unit is connected with one end of the communication unit; the other end of the communication unit is connected with the signal transmission channel.
It should be noted that the embodiment of the present invention provides a signal preprocessor circuit, which is mainly used for preprocessing signals collected by each sensor and then transmitting the preprocessed signals to a diagnosis host. The sensors are mainly divided into two types, the first type of sensor can be a composite sensor used for collecting vibration and impact signals of key parts of the walking part, and the second type of sensor can be a temperature sensor used for collecting shaft temperature signals.
In this embodiment, the first sampling signal output by the first type of sensor is output to the signal transmission channel of the diagnostic host through the multi-channel analog switch. Wherein the first sampling signal of first class sensor output is analog signal, and 8 or 9 way exports usually, selects arbitrary 4 way transmission to the signal transmission passageway of diagnosis host computer through the switching of multichannel analog switch, can the transmission cable quantity that significantly reduces. Meanwhile, the coding signal is switched by the multi-channel analog switch to select any 1 channel to be output to the micro-processing unit, and the micro-processing unit controls the switching of the multi-channel analog switch according to the coding signal to realize the time-sharing transmission of the first sampling signal output by the first type of sensor to the diagnosis host. And a second sampling signal output by the second type sensor is transmitted to a signal transmission channel of the diagnosis host computer through a serial interface of the microprocessor unit and the communication unit. The second sampling signal output by the second type of sensor is a digital signal which has been converted by the sensor analog-to-digital conversion module, for example, the thermocouple temperature sensor is usually integrated with the analog-to-digital conversion module itself, and the output is a digital signal which is transmitted to a signal transmission channel of the diagnostic host through the communication unit via the serial interface of the microprocessor unit. Output signals of all the sensors are preprocessed and then transmitted to the diagnosis host in a time-sharing mode, so that the number of transmission cables is reduced, and the reliability of signal transmission is improved.
Referring to fig. 2, a schematic diagram of another signal pre-processor circuit according to an embodiment of the present invention is shown. In order to adapt to the output of various sensors, in one embodiment, the signal pre-processor circuit further comprises a first analog-to-digital conversion unit, and the input end of the serial interface of the micro-processing unit is connected with the output end of the second sampling signal through the first analog-to-digital conversion unit. In this embodiment, the second sampling signal output by the second type of sensor may be an analog signal that is not analog-to-digital converted, such as an analog signal output by the platinum resistance temperature sensor, and after being converted into a digital signal by the first analog-to-digital conversion unit, the digital signal is transmitted to the signal transmission channel of the diagnostic host through the serial interface of the microprocessor unit via the communication unit.
Further, in an embodiment, the signal pre-processor circuit further includes a first filtering unit and a first differential amplifying unit, an input terminal of the first filtering unit is connected to an output terminal of the second sampling signal, an output terminal of the first filtering unit is connected to an input terminal of the first differential amplifying unit, and an output terminal of the first differential amplifying unit is connected to an input terminal of the first analog-to-digital converting unit. In this embodiment, the second sampling signal output by the second type of sensor is filtered and signal-amplified before being analog-to-digital converted into a digital signal, so as to reduce noise and eliminate interference, thereby reducing data processing pressure of the subsequent diagnostic host.
Optionally, in an embodiment, the signal pre-processor circuit further includes a current-voltage conversion unit and a second analog-to-digital conversion unit, and the first output terminal of the multi-path analog switch unit is connected to the signal transmission channel through the current-voltage conversion unit, the second analog-to-digital conversion unit, the micro-processing unit, and the communication unit, respectively. In this embodiment, the first sampling analog signal output by the first type of sensor is converted into a voltage signal by the current-voltage conversion unit after being switched by the multi-channel analog switch, then is converted into a digital signal by the second analog-to-digital conversion unit, and finally is transmitted to the signal transmission channel of the diagnostic host by the micro-processing unit and the communication unit.
Further, in an embodiment, the signal pre-processor circuit further includes a second filtering unit and a second differential amplifying unit, an input terminal of the second filtering unit is connected to the output terminal of the current-voltage converting unit, an output terminal of the second filtering unit is connected to the input terminal of the second differential amplifying unit, and an output terminal of the second differential amplifying unit is connected to the input terminal of the second analog-to-digital converting unit. In this embodiment, after the first sampling signal output by the first type of sensor is converted into the voltage signal by the current-voltage conversion unit, the first sampling signal is also subjected to filtering and signal amplification processing before being subjected to analog-to-digital conversion into the digital signal, so that noise is reduced, interference is eliminated, and data processing pressure of a subsequent diagnosis host can be further reduced.
Specifically, in the embodiment of the utility model provides an in, singlechip or MCU can be chooseed for use to the microprocessor unit, and RS485 communication unit can be chooseed for use to the communication unit. The single chip microcomputer or the MCU can conveniently integrate interfaces such as A/D conversion, SPI (Serial Peripheral Interface, English name: Serial Peripheral Interface), UART (Universal Asynchronous Receiver Transmitter/Transmitter, English name: Universal Asynchronous Receiver/Transmitter) and the like, and analog signals output by the sensor are converted into digital signals and then can be output to the single chip microcomputer or the MCU through an SPI bus. The RS485 communication unit converts the UART signal into an RS485 bus signal for communication with the diagnosis host.
Optionally, in an embodiment, the signal pre-processor circuit further includes a power conversion unit. The power conversion unit converts the 24V input voltage into corresponding voltage to supply power to each circuit unit. Such as 12V voltage required by a multi-path analog switch unit, 3.3V voltage required by a micro-processing unit, an analog-to-digital conversion unit and a communication unit, and the like.
The utility model discloses the second aspect provides a signal acquisition processing apparatus, including sensor and above-mentioned signal preprocessor circuit. The multi-channel sensor is used for collecting vibration and impact signals of the walking part and temperature signals of the bearing, and the signal pre-processor circuit is used for preprocessing the signals collected by the multi-channel sensor and transmitting the signals to the diagnosis host machine in a time-sharing manner. The signal preprocessor circuit is external, can reduce transmission cable quantity, improves signal transmission's reliability.
The utility model discloses the third aspect provides a fault diagnosis system, including diagnosis host computer and above-mentioned signal acquisition processing apparatus, the diagnosis host computer is used for carrying out the failure analysis diagnosis to the signal through the preliminary treatment of signal acquisition processing apparatus transmission. The whole fault diagnosis system is simple in cable arrangement, the reliability of signal transmission is enhanced, and real-time diagnosis and analysis of key parts of the running gear can be realized.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A signal pre-processor circuit, comprising: the system comprises a multi-path analog switch unit, a micro-processing unit and a communication unit;
the first input end of the multi-path analog switch unit is connected with the output end of the first sampling signal, the first output end of the multi-path analog switch unit is connected with the signal transmission channel, the second input end of the multi-path analog switch unit is connected with the output end of the coding signal, and the second output end and the control end of the multi-path analog switch unit are both connected with the micro-processing unit;
the serial interface input end of the micro-processing unit is connected with the output end of the second sampling signal, and the serial interface output end of the micro-processing unit is connected with one end of the communication unit;
the other end of the communication unit is connected with the signal transmission channel.
2. The signal pre-processor circuit of claim 1, further comprising a first analog-to-digital conversion unit, wherein an input of the serial interface of the micro-processing unit is connected to an output of the second sampling signal through the first analog-to-digital conversion unit.
3. The signal pre-processor circuit according to claim 2, further comprising a first filtering unit and a first differential amplifying unit, wherein an input terminal of the first filtering unit is connected to an output terminal of the second sampling signal, an output terminal of the first filtering unit is connected to an input terminal of the first differential amplifying unit, and an output terminal of the first differential amplifying unit is connected to an input terminal of the first analog-to-digital converting unit.
4. The signal pre-processor circuit according to claim 1, further comprising a current-to-voltage conversion unit and a second analog-to-digital conversion unit, wherein the first output terminal of the multi-channel analog switch unit is connected to the signal transmission channel through the current-to-voltage conversion unit, the second analog-to-digital conversion unit, the micro-processing unit and the communication unit, respectively.
5. The signal pre-processor circuit according to claim 4, further comprising a second filtering unit and a second differential amplifying unit, wherein an input terminal of the second filtering unit is connected to the output terminal of the current-voltage converting unit, an output terminal of the second filtering unit is connected to the input terminal of the second differential amplifying unit, and an output terminal of the second differential amplifying unit is connected to the input terminal of the second analog-to-digital converting unit.
6. The signal pre-processor circuit according to claim 1, wherein the microprocessor unit is a single chip or an MCU.
7. The signal pre-processor circuit of claim 1, wherein the communication unit is an RS485 communication unit.
8. The signal pre-processor circuit according to any of claims 1 to 7, further comprising a power conversion unit.
9. A signal acquisition processing apparatus comprising a sensor and the signal pre-processor circuit of claim 8.
10. A fault diagnosis system comprising a diagnosis host and the signal acquisition and processing device according to claim 9.
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| CN201921403900.5U CN210198728U (en) | 2019-08-27 | 2019-08-27 | Signal preprocessor circuit, signal acquisition processing device and fault diagnosis system |
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| CN201921403900.5U CN210198728U (en) | 2019-08-27 | 2019-08-27 | Signal preprocessor circuit, signal acquisition processing device and fault diagnosis system |
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