CN109840582B - Redundant fault-tolerant system of dust particle counter and signal processing method - Google Patents
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Abstract
The invention relates to a redundant fault-tolerant system of a dust particle counter and a signal processing method, belonging to the field of optical dust particle counters. The system comprises: the system comprises a sensor, a main processor, a first auxiliary processor, a second auxiliary processor and a display screen; the main processor is internally integrated with a main processor analog-to-digital conversion module and a main processing unit; the first slave processor is internally integrated with a first slave processor analog-to-digital conversion module and a first slave processing unit; the second slave processor is internally integrated with a second slave processor analog-to-digital conversion module and a second slave processing unit; the sensor is electrically connected with the main processor, the first auxiliary processor and the second auxiliary processor through wires respectively; the first slave processor and the second slave processor are electrically connected with the main processor through wires; the main processor is electrically connected with the display screen through a wire; the method can solve the problem that the single processor processes the analog signals output by the sensor and the signal interference is obvious under different severe working conditions; the failure rate of the system is reduced.
Description
Technical Field
The invention belongs to the field of optical dust particle counters (Optical Particle Counter, OPC), and particularly relates to a redundant fault-tolerant system of a dust particle counter and a signal processing method.
Background
Most Micro-pollution (Micro-pollution) industries rely on the use of optical dust particle counters, which are generally used for detecting atmospheric particle pollution in clean rooms and clean areas, counting and analyzing the number of Micro-particles in the atmosphere of the clean environment, judging the clean level of the clean environment according to international standards such as ISO14644-1 and the like, and are widely applied to industries such as pharmacy, chemical industry, microelectronics, semiconductors, inspection and quarantine and the like.
The core component of the optical particle counter is a sensor, adopts the light scattering principle, uses a photoelectric detector to convert the light signal scattered by particles into an electric signal, and the smaller the particle size is, the weaker the signal is. The analog signal output by the sensor is mostly a spike signal with relatively high frequency and no regularity. These characteristics lead to great difficulty in processing the analog signal output by the sensor, and thus to low accuracy of the dust particle counter.
The traditional particle counter adopts a single processor to process analog signals output by the sensor, so that the signal interference is obvious under different severe working conditions, and the accuracy of the dust particle counter and the reliability of the instrument are reduced.
Disclosure of Invention
The invention aims to provide a redundant fault-tolerant system of a dust particle counter and a signal processing method, which have the advantages of simple structure, high reliability and high accuracy.
In order to achieve the above purpose, the present invention provides the following technical solutions:
In a first aspect, there is provided a redundant fault tolerant system for a dust particle counter, the system comprising: the system comprises a sensor, a main processor, a first auxiliary processor, a second auxiliary processor and a display screen;
The main processor is internally integrated with a main processor analog-to-digital conversion module and a main processing unit; the first slave processor is internally integrated with a first slave processor analog-to-digital conversion module and a first slave processing unit; the second slave processor is internally integrated with a second slave processor analog-to-digital conversion module and a second slave processing unit;
The sensor is electrically connected with the main processor, the first auxiliary processor and the second auxiliary processor through wires respectively; the first slave processor and the second slave processor are electrically connected with the main processor through wires; the main processor is electrically connected with the display screen through a wire.
Optionally, the sensor sends the output analog signals to the first slave processor, the second slave processor and the master processor, respectively;
Accordingly, the first slave processor, the second slave processor and the master processor respectively convert the received analog signals into digital signals and process the digital signals.
Optionally, the master processing unit is electrically connected with the first slave processing unit and the second slave processing unit respectively;
The main processing unit comprises a logic operation circuit, and the logic operation circuit carries out logic operation on the processing result output by the first slave processing unit, the processing result output by the second slave processing unit and/or the processing result of the digital signal by the main processing unit to obtain a final processing result.
Optionally, the display screen is formed by a touch display module.
Optionally, the touch display module includes a touch driving chip and a screen driving chip, where the touch driving chip is a TSC2046 chip, and the screen driving chip is an SSD1963 chip.
Optionally, the master processing unit, the first slave processing unit and the second slave processing unit adopt Cortex M3 chips.
In a second aspect, there is provided a signal processing method in a redundant fault tolerant system of dust particle counters, the method being applied to the redundant fault tolerant system of dust particle counters provided in the first aspect, the method comprising:
The analog-to-digital conversion module of the main processor converts the analog signal output by the sensor into a digital signal, and performs signal processing in the main processing unit to obtain a first processing result;
The first slave processor analog-to-digital conversion module converts the analog signal output by the sensor into a digital signal, and performs signal processing in the first slave processing unit to obtain a second processing result; and sending the second processing result to the main processing unit;
The second slave processor analog-to-digital conversion module converts the analog signal output by the sensor into a digital signal, and performs signal processing in the second slave processing unit, and a third processing result is obtained; and sending the third processing result to the main processing unit;
The main processing unit performs a logical operation: whether or not ((a & b & c) = a) = & ((a & b & c) = b) = & ((a & b & c) = c) is true; if true, outputting a result of a & b & c; if not, executing logic operation: ((a & b) = a) & & ((a) whether or not & b) = b) holds; if so, outputting a result of a & b; if not, performing logic operation: ((b & c) = b) & & ((b) and c) = c) is true; if so, outputting a result of b & c; if not, performing logic operation: whether or not ((a & c) = a) = & ((a & c) = c) is true; if so, outputting a result of a & c; if not, marking as a fault and displaying, and generating a log file;
wherein a is the first processing result, b is the second processing result, and c is the third processing result.
Optionally, before the main processor analog-to-digital conversion module converts the analog signal output by the sensor into a digital signal, the method further includes:
the master processing unit sends a first state detection code to the first slave processing unit; and transmitting a second state detection code to the second slave processing unit;
the first slave processing unit returns the received first state detection code to the master processing unit;
The second slave processing unit returns the received second state detection code to the master processing unit;
the main processing unit compares whether a first state code sent by the first slave processing unit is consistent with a first state code sent by the main processing unit, and whether a second state code sent by the second slave processing unit is consistent with a second state code sent by the main processing unit;
if the two types of data are inconsistent, marking the two types of data as faults and displaying the faults, and generating a log file.
The invention has the beneficial effects that: by arranging three channels and three processors in the system, analog signals output by the sensor are collected and processed at the same time, and the three signal processing channels are mutually independent, so that the reliability of signal processing is greatly improved; the problems that the single processor processes the analog signals output by the sensor, the interference of the signals is obvious under different severe working conditions, and the accuracy of a dust particle counter and the reliability of an instrument are reduced can be solved; even if any channel is interfered by severe working condition environments or any slave processor fails, normal counting cannot be affected, and the failure rate of the system is greatly reduced.
The redundant fault-tolerant signal processing method of the dust particle counter is simple and effective, has lower requirements on a processor, and further saves the overall cost of the instrument.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the redundant fault tolerant system of dust particle counters of the present invention.
Fig. 2 is a flow chart of a signal processing method in the redundant fault tolerant system of the dust particle counter of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Referring to FIG. 1, in one embodiment of the invention, a redundant fault tolerant system for a dust particle counter includes: a sensor 110, a master processor 120, a first slave processor 130, a second slave processor 140, and a display screen 150.
The sensor 110 is electrically connected with the main processor 120, the first slave processor 130 and the second slave processor 140 through wires respectively; the first slave processor 130 and the second slave processor 140 are electrically connected with the master processor 120 through wires; the main processor 120 is electrically connected to the display 150 by wires.
The sensor 110 is configured to transmit the output analog signals to the first slave processor 130, the second slave processor 140, and the master processor 120, respectively; accordingly, the first slave processor 130, the second slave processor 140, and the master processor 120 respectively convert the received analog signals into digital signals and process the digital signals.
Specifically, the main processor 120 has integrated therein a main processor analog-to-digital conversion module and a main processing unit. The main processor analog-to-digital conversion module is configured to convert an analog signal received by the main processor 120 into a digital signal; the main processing unit is used for processing the digital signals to obtain processing results.
The first slave processor 130 has integrated therein a first slave processor analog-to-digital conversion module and a first slave processing unit. Wherein the first slave processor analog-to-digital conversion module is configured to convert the analog signal received by the first slave processor 130 into a digital signal; the first slave processing unit is used for processing the digital signal to obtain a processing result.
The second slave processor 140 has a second slave processor analog-to-digital conversion module and a second slave processing unit integrated therein. The second slave processor analog-to-digital conversion module is configured to convert the analog signal received by the second slave processor 140 into a digital signal; the second slave processing unit is used for processing the digital signal to obtain a processing result.
The system forms three processing channels through the three processors to collect and process the analog signals output by the sensor, and the three signal processing channels are mutually independent, so that the reliability of signal processing is greatly improved.
In this embodiment, the master processing unit is electrically connected to the first slave processing unit and the second slave processing unit respectively; the main processing unit comprises a logic operation circuit, and the logic operation circuit carries out logic operation on the processing result output by the first slave processing unit, the processing result output by the second slave processing unit and/or the processing result of the digital signal by the main processing unit to obtain a final processing result. In this way, the main processing unit can send instructions to the first slave processing unit and the second slave processing unit, and the first slave processing unit and the second slave processing unit can also transmit calculation results to the main processing unit so as to enable the main processing unit to perform logic operation.
The main processor is electrically connected with the display screen through a lead, so that man-machine interaction and display of processing results are facilitated.
Optionally, the display 150 is constituted by a touch display module. The touch display module comprises a touch driving chip and a screen driving chip, wherein the touch driving chip is a TSC2046 chip, and the screen driving chip is an SSD1963 chip.
Optionally, the master processing unit, the first slave processing unit and the second slave processing unit adopt Cortex M3 chips.
In summary, according to the redundant fault-tolerant system of the dust particle counter, three channels and three processors are arranged in the system to collect and process the analog signals output by the sensor, and the three signal processing channels are mutually independent, so that the reliability of signal processing is greatly improved; the problems that the single processor processes the analog signals output by the sensor, the interference of the signals is obvious under different severe working conditions, and the accuracy of a dust particle counter and the reliability of an instrument are reduced can be solved; even if any channel is interfered by severe working condition environments or any slave processor fails, normal counting cannot be affected, and the failure rate of the system is greatly reduced.
Optionally, based on the foregoing redundant fault tolerant system of dust particle counter, referring to fig. 2, an exemplary embodiment of the present application further provides a signal processing method in the redundant fault tolerant system of dust particle counter, where the method at least includes the following steps:
Step 201, the analog-to-digital conversion module of the main processor converts the analog signal output by the sensor into a digital signal, and performs signal processing in the main processing unit to obtain a first processing result.
Step 202, a first slave processor analog-to-digital conversion module converts an analog signal output by a sensor into a digital signal, and performs signal processing in a first slave processing unit to obtain a second processing result; and sends the second processing result to the main processing unit.
Step 203, the analog signal output by the sensor is converted into a digital signal by the second slave processor analog-to-digital conversion module, and the signal processing is performed in the second slave processing unit, and the third processing result is obtained; and transmitting the third processing result to the main processing unit.
In step 204, the main processing unit performs a logic operation: whether or not ((a & b & c) = a) = & ((a & b & c) = b) = & ((a & b & c) = c) is true; if true, outputting a result of a & b & c; if not, executing logic operation: ((a & b) = a) & & ((a) whether or not & b) = b) holds; if so, outputting a result of a & b; if not, performing logic operation: ((b & c) = b) & & ((b) and c) = c) is true; if so, outputting a result of b & c; if not, performing logic operation: whether or not ((a & c) = a) = & ((a & c) = c) is true; if so, outputting a result of a & c; if not, marking as a fault and displaying, generating a log file, wherein a is a first processing result, b is a second processing result, and c is a third processing result.
Optionally, prior to step 201, the master processor may also determine whether the first slave processing unit and the second slave processing unit are malfunctioning. At this time, the master processing unit transmits a first state detection code to the first slave processing unit; and transmitting a second state detection code to the second slave processing unit; the first slave processing unit returns the received first state detection code to the master processing unit; the second slave processing unit returns the received second state detection code to the master processing unit; the main processing unit compares whether the first state code sent by the first slave processing unit is consistent with the first state code sent by the main processing unit, and whether the second state code sent by the second slave processing unit is consistent with the second state code sent by the main processing unit; if the two types of data are inconsistent, marking the two types of data as faults and displaying the faults, and generating a log file.
In summary, in the signal processing method in the redundant fault-tolerant system of the dust particle counter provided by the embodiment, the analog signal output by the sensor is converted into the digital signal by the analog-to-digital conversion module of the main processor, and the signal processing is performed in the main processing unit, so as to obtain the first processing result; the analog signal output by the sensor is converted into a digital signal by the analog-to-digital conversion module of the first slave processor, and the digital signal is processed in the first slave processing unit to obtain a second processing result; and sending the second processing result to the main processing unit; the analog signal output by the sensor is converted into a digital signal by the analog-to-digital conversion module of the second slave processor, the signal processing is carried out in the second slave processing unit, and a third processing result is obtained; and sending the third processing result to the main processing unit; the main processing unit executes logic operation according to the first processing result, the second processing result and the third processing result; the problems that the single processor processes the analog signals output by the sensor, the interference of the signals is obvious under different severe working conditions, and the accuracy of a dust particle counter and the reliability of an instrument are reduced can be solved; even if any channel is interfered by severe working condition environments or any slave processor fails, normal counting cannot be affected, and the failure rate of the system is greatly reduced.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. A signal processing method in a redundant fault tolerant system of a dust particle counter, applied to a redundant fault tolerant system of a dust particle counter, the system comprising: the system comprises a sensor, a main processor, a first auxiliary processor, a second auxiliary processor and a display screen;
The main processor is internally integrated with a main processor analog-to-digital conversion module and a main processing unit; the first slave processor is internally integrated with a first slave processor analog-to-digital conversion module and a first slave processing unit; the second slave processor is internally integrated with a second slave processor analog-to-digital conversion module and a second slave processing unit;
the sensor is electrically connected with the main processor, the first auxiliary processor and the second auxiliary processor through wires respectively; the first slave processor and the second slave processor are electrically connected with the main processor through wires; the main processor is electrically connected with the display screen through a wire;
The method comprises the following steps:
The analog-to-digital conversion module of the main processor converts the analog signal output by the sensor into a digital signal, and performs signal processing in the main processing unit to obtain a first processing result;
The first slave processor analog-to-digital conversion module converts the analog signal output by the sensor into a digital signal, and performs signal processing in the first slave processing unit to obtain a second processing result; and sending the second processing result to the main processing unit;
The second slave processor analog-to-digital conversion module converts the analog signal output by the sensor into a digital signal, and performs signal processing in the second slave processing unit, and a third processing result is obtained; and sending the third processing result to the main processing unit;
The main processing unit performs a logical operation: whether or not ((a & b & c) = a) = & ((a & b & c) = b) = & ((a & b & c) = c) is true; if true, outputting a result of a & b & c; if not, executing logic operation: ((a & b) = a) & & ((a) whether or not & b) = b) holds; if so, outputting a result of a & b; if not, performing logic operation: ((b & c) = b) & & ((b) and c) = c) is true; if so, outputting a result of b & c; if not, performing logic operation: whether or not ((a & c) = a) = & ((a & c) = c) is true; if so, outputting a result of a & c; if not, marking as a fault and displaying, and generating a log file;
wherein a is the first processing result, b is the second processing result, and c is the third processing result.
2. The system of claim 1, wherein the sensor sends the output analog signals to the first slave processor, the second slave processor, and the master processor, respectively;
Accordingly, the first slave processor, the second slave processor and the master processor respectively convert the received analog signals into digital signals and process the digital signals.
3. The system of claim 2, wherein the master processing unit is electrically connected to the first slave processing unit and the second slave processing unit, respectively;
The main processing unit comprises a logic operation circuit, and the logic operation circuit carries out logic operation on the processing result output by the first slave processing unit, the processing result output by the second slave processing unit and/or the processing result of the digital signal by the main processing unit to obtain a final processing result.
4. A system according to any one of claims 1 to 3, wherein the display screen is constituted by a touch display module.
5. The system of claim 4, wherein the touch display module comprises a touch driver chip and a screen driver chip, the touch driver chip being a TSC2046 chip and the screen driver chip being an SSD1963 chip.
6. A system according to any one of claims 1 to 3, wherein the master processing unit, the first slave processing unit and the second slave processing unit employ Cortex M3 chips.
7. The method of claim 1, wherein before the main processor analog-to-digital conversion module converts the analog signal output by the sensor to a digital signal, further comprising:
the master processing unit sends a first state detection code to the first slave processing unit; and transmitting a second state detection code to the second slave processing unit;
the first slave processing unit returns the received first state detection code to the master processing unit;
The second slave processing unit returns the received second state detection code to the master processing unit;
the main processing unit compares whether a first state code sent by the first slave processing unit is consistent with a first state code sent by the main processing unit, and whether a second state code sent by the second slave processing unit is consistent with a second state code sent by the main processing unit;
if the two types of data are inconsistent, marking the two types of data as faults and displaying the faults, and generating a log file.
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| CN104991142A (en) * | 2015-07-09 | 2015-10-21 | 杭州亿恒科技有限公司 | Signal analyzer and device and processing method |
| CN209640917U (en) * | 2019-03-29 | 2019-11-15 | 苏州苏信环境科技有限公司 | Airborne particle counter redundancy fault-tolerant system |
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| CN101930052A (en) * | 2010-07-21 | 2010-12-29 | 电子科技大学 | Online detection fault-tolerance system of FPGA (Field programmable Gate Array) digital sequential circuit of SRAM (Static Random Access Memory) type and method |
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| CN209640917U (en) * | 2019-03-29 | 2019-11-15 | 苏州苏信环境科技有限公司 | Airborne particle counter redundancy fault-tolerant system |
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