CN116660781B - Outdoor high-power bidirectional quick-charging mobile power supply testing system - Google Patents
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Abstract
The invention discloses an outdoor high-power bidirectional quick-charging mobile power supply testing system, in particular to the technical field of mobile power supply testing, which is used for solving the problem that the condition of monitoring the temperature change of a mobile power supply in the testing process is not accurate enough when the state of the existing temperature sensor is poor; the system comprises a data processing module, an information acquisition module, a real-time test state module and a monitoring effect judging module, wherein the information acquisition module, the real-time test state module and the monitoring effect judging module are in communication connection with the data processing module; the method is characterized in that the accuracy and the reliability of the temperature sensor in the bidirectional quick-charge simulation test are guaranteed by judging a real-time test state module according to early warning signals, the validity and the reliability of a monitoring result of the temperature sensor are timely identified by analyzing and judging the number of the state early warning signals, the accuracy and the reliability of the testing result are guaranteed by adopting corresponding measures, the testing effect and the reliability of data are improved, and the normal operation of the temperature sensor and the successful performance of the test are guaranteed.
Description
Technical Field
The invention relates to the technical field of mobile power supply testing, in particular to an outdoor high-power bidirectional quick-charging mobile power supply testing system.
Background
The outdoor high-power bidirectional fast-charging mobile power supply is portable power supply equipment, and is designed to provide power supply and charging functions for various electronic equipment in an outdoor environment or a mobile scene. The outdoor high-power bidirectional quick-charging mobile power supply has higher power output capability, can meet the power requirements of high-power equipment or a plurality of equipment, can help to determine whether the quality level and performance of a product meet the design requirements and standards or not by testing the outdoor high-power bidirectional quick-charging mobile power supply, can find potential problems and defects through testing, and can solve the problems early so as to ensure the reliability and stability of the product.
When the simulation test is carried out on the bidirectional quick charge, a temperature sensor is needed, and the test is carried out by using the temperature sensor so as to evaluate the temperature change condition of the mobile power supply in the use process.
But in the use of the temperature sensor, the real-time state of the temperature sensor cannot be monitored, and when the real-time state of the temperature sensor is worse, the temperature sensor cannot be found in time, so that the temperature change condition of the temperature sensor monitoring mobile power supply in the test process is not accurate enough, and the accuracy of the test of the outdoor high-power bidirectional fast charging mobile power supply can be influenced.
In order to solve the above problems, a technical solution is now provided.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks of the prior art, an embodiment of the present invention provides an outdoor high-power bidirectional fast-charging mobile power supply testing system to solve the problems set forth in the above-mentioned background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the outdoor high-power bidirectional quick-charging mobile power supply testing system comprises a data processing module, an information acquisition module, a real-time testing state module and a monitoring effect judging module, wherein the information acquisition module, the real-time testing state module and the monitoring effect judging module are in communication connection with the data processing module;
The information acquisition module acquires self-state information and outdoor environment influence information, sends the self-state information and the outdoor environment influence information to the data processing module, and calculates to obtain a temperature sensing state evaluation coefficient;
The real-time test state module sends state early warning signals of different grades through comparison of the temperature sensing state evaluation coefficient and the temperature sensing state judgment first threshold value and the temperature sensing state judgment second threshold value;
The monitoring effect judging module judges the effectiveness of the monitoring result of the temperature sensor according to the number of the generated primary state early-warning signals, the number of the generated secondary state early-warning signals and the number of the generated tertiary state early-warning signals.
In a preferred embodiment, the self-state information includes contact pressure ratio and accuracy assessment index;
the acquisition logic of the contact pressure ratio is:
the contact pressure is as follows: ; wherein R is the actual resistance value of the piezoresistor; r0 is a reference resistance value of the piezoresistor in a non-pressure state; s is the sensitivity of the piezoresistor;
contact pressure ratio of ; WhereinFor contact pressure ratio,The contact pressure is preset;
The acquisition logic of the precision evaluation index is as follows:
calculating the variation of the output voltage and the variation of the temperature output by the temperature sensor in time t;
The precision evaluation index is as follows ; WhereinFor the variation of output voltage,The output temperature variation;
Calculating the precision evaluation index in each time T, acquiring the maximum precision evaluation index in the time T, and calculating the average value of the precision evaluation indexes in the time T; the comprehensive precision evaluation value is the product of the maximum precision evaluation index in the time T and the average value of the precision evaluation indexes in the time T.
In a preferred embodiment, the outdoor environmental impact information includes a humidity evaluation value and an illuminance value;
The humidity evaluation value acquisition logic is as follows:
acquiring a numerical value of humidity in the environment based on the humidity sensor;
calculating the humidity change rate: the value obtained by subtracting the previous humidity from the current humidity is divided by the previous humidity, and the humidity change rate is obtained;
The humidity evaluation value was ，Is humidity,Is the rate of change of humidity.
In a preferred embodiment, the data processing module calculates the temperature sensing state evaluation coefficient by normalizing the contact pressure ratio, the comprehensive accuracy evaluation value, the humidity evaluation value and the illuminance value acquired by the information acquisition module, wherein the expression is:
; wherein, For the temperature-sensitive state evaluation coefficient,Is the illuminance value,In order to integrate the accuracy evaluation value,Preset proportionality coefficients of contact pressure ratio, comprehensive precision evaluation value, humidity evaluation value and illuminance value respectively, andAre all greater than 0.
In a preferred embodiment, a first temperature-sensitive state determination threshold and a second temperature-sensitive state determination threshold are set, the first temperature-sensitive state determination threshold being smaller than the second temperature-sensitive state determination threshold;
When the temperature sensing state evaluation coefficient is larger than the temperature sensing state judgment second threshold value, the real-time test state module generates a primary state early warning signal; when the temperature sensing state evaluation coefficient is smaller than or equal to the temperature sensing state judgment second threshold value and is larger than or equal to the temperature sensing state judgment first threshold value, the real-time test state module generates a secondary state early warning signal; when the temperature sensing state evaluation coefficient is smaller than the temperature sensing state judgment first threshold value, the real-time test state module generates a three-level state early warning signal.
In a preferred embodiment, counting the total number of state early warning signals sent by the real-time test state module in the time Q, and marking the number of generated primary state early warning signals, the number of generated secondary state early warning signals and the number of generated tertiary state early warning signals as E1, E2 and E3 respectively;
when E3 is more than or equal to 1, the monitoring effect judging module generates a replacement signal;
When (when) The monitoring effect judging module generates a replacement signal;
When (when) Calculating the interval time of each two adjacent secondary state early warning signals; calculating the number of cases that the interval time of two adjacent secondary state early warning signals is larger than the safety preset time, and generating a replacement signal by the monitoring effect judging module when the number of cases that the interval time of two adjacent secondary state early warning signals is larger than the safety preset time is larger than the preset safety number;
EM is the signal duty cycle threshold.
The invention relates to a high-power bidirectional quick-charging mobile power supply testing system for outdoor use, which has the technical effects and advantages that:
1. Through the judgment of the real-time test state module, the system generates primary, secondary or tertiary state early warning signals which can help testers to timely identify the working state of the temperature sensor, and corresponding measures are taken according to the early warning signals, so that the accuracy and reliability of the temperature sensor in the bidirectional quick-charge simulation test are ensured, and the reliability of the test result is improved.
2. The validity and the reliability of the monitoring result of the temperature sensor are timely identified through the analysis and the judgment of the quantity of the state early warning signals, and corresponding measures are taken to ensure the accuracy and the reliability of the testing result, improve the testing effect and the reliability of data, and ensure the normal work of the temperature sensor and the successful implementation of the testing.
Drawings
Fig. 1 is a schematic structural diagram of an outdoor high-power bidirectional fast-charging mobile power supply testing system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Fig. 1 shows a schematic structural diagram of an outdoor high-power bidirectional fast-charging mobile power supply test system, which comprises a data processing module, an information acquisition module, a real-time test state module and a monitoring effect judging module, wherein the information acquisition module, the real-time test state module and the monitoring effect judging module are in communication connection with the data processing module.
The information acquisition module acquires self state information and outdoor environment influence information, sends the self state information and the outdoor environment influence information to the data processing module, and calculates to obtain a temperature sensing state evaluation coefficient.
The real-time test state module sends state early warning signals of different grades through comparison of the temperature sensing state evaluation coefficient and the temperature sensing state judgment first threshold value and the temperature sensing state judgment second threshold value.
The monitoring effect judging module judges the effectiveness of the monitoring result of the temperature sensor according to the number of the generated primary state early-warning signals, the number of the generated secondary state early-warning signals and the number of the generated tertiary state early-warning signals.
Example 2
The information acquisition module acquires self-state information and outdoor environment influence information.
Wherein the self-state information includes a contact pressure ratio and an accuracy assessment index.
When the simulation test is carried out on the bidirectional quick charge, the influence of vibration and the like included by outdoor factors is considered, the contact pressure of the temperature sensor and the outdoor high-power bidirectional quick charge mobile power supply can change, and the contact pressure of the temperature sensor and the outdoor high-power bidirectional quick charge mobile power supply has a certain influence on a test result: the higher contact pressure can improve the thermal contact quality, so that the temperature sensor can more accurately sense the temperature of the measured object; a smaller contact pressure may result in a reduced rate of thermal conduction between the sensor and the object being measured, reducing the real-time and response speed of the measurement.
The acquisition logic of the contact pressure ratio is:
And placing a piezoresistor at the contact position of the temperature sensor and the outdoor high-power bidirectional quick-charging mobile power supply, wherein the resistance value of the piezoresistor is changed along with the change of the contact pressure.
We assume that the resistance of the piezo-resistor is linear with pressure and that the reference resistance value is independent of pressure; the sensitivity of the varistor is usually provided by the manufacturer, and the sensitivity represents the resistance value change caused by the unit pressure change, and then the contact pressure is: ; wherein R is the actual resistance value (unit: ohm) of the piezoresistor; r0 is a reference resistance value (unit: ohm) of the piezoresistor in a non-pressure state; s is the sensitivity of the varistor (in Pa.s.s..
Contact pressure ratio of; WhereinFor contact pressure ratio,For preset contact pressure, the larger the contact pressure ratio is, the more closely the temperature sensor is contacted with the outdoor high-power bidirectional quick-charging mobile power supply, and the more accurate the test result of the temperature sensor is; the smaller the contact pressure ratio is, the lower the real-time performance and response speed of the temperature sensor for measuring the temperature are, and the less accurate the test result of the temperature sensor is.
The preset contact pressure is set according to practical situations such as the type of the piezoresistor and the specification type of the temperature sensor, and the like, and will not be repeated here.
The acquisition logic of the precision evaluation index is as follows:
Calculating the variation of the output voltage in the time t, and the variation of the temperature output by the temperature sensor along with the variation of the output voltage in the time t; it is noted that the value of time t should be as small as possible to better evaluate the accuracy of the temperature sensor.
The precision evaluation index is as follows; WhereinFor the variation of output voltage,The output temperature variation; the smaller the accuracy evaluation index is, the smaller the sensing capability of the sensor to temperature change is, the worse the monitoring capability of the temperature sensor to temperature is in the simulation test of bidirectional fast charging, and the inaccuracy of the test of the outdoor high-power bidirectional fast charging mobile power supply is more easily caused.
In order to judge the accuracy of the temperature sensor more comprehensively and comprehensively, calculating an accuracy evaluation index in each time T in the time T, acquiring the maximum accuracy evaluation index in the time T, and calculating the average value of the accuracy evaluation indexes in the time T; the comprehensive precision evaluation value is the product of the maximum precision evaluation index in the time T and the average value of the precision evaluation indexes in the time T.
T=n×t, n is a positive integer greater than 1, for example n is 10.
The smaller the integrated accuracy evaluation value, which means that the smaller the sensing capability of the integrated temperature change of the sensor during the time T, the worse the monitoring capability of the temperature sensor for a longer period of time at the time of the simulation test of the bidirectional quick charge.
Although in outdoor environment simulation, outdoor temperature monitoring is particularly important, when the temperature sensor monitors the temperature of the outdoor high-power bidirectional quick-charging mobile power supply, the influence of the outdoor temperature on the temperature of the outdoor high-power bidirectional quick-charging mobile power supply is reflected by the temperature sensor, the working property of the temperature sensor is measured temperature, the measured temperature range is large enough, and the influence of the outdoor temperature on the temperature sensor is usually not influenced or is smaller, so that in the outdoor environment simulation, the influence of the outdoor temperature on the temperature sensor is not directly considered.
In outdoor environment, the influence of humidity and light radiation on the outdoor high-power bidirectional fast charging mobile power supply is large, and in outdoor environment simulation, it is also very important to acquire the relevant information of the humidity and the light radiation for analyzing the influence of the outdoor environment on the use state of the temperature sensor.
The outdoor environmental impact information includes a humidity evaluation value and an illuminance value.
The humidity evaluation value acquisition logic is as follows:
based on the humidity sensor, a value of the humidity in the environment is obtained.
Calculating the humidity change rate: the value obtained by subtracting the previous humidity from the current humidity is divided by the previous humidity, and the humidity change rate is obtained; the greater the rate of change of humidity, the greater the adverse effect of the humidity of the environment on the temperature sensor.
The humidity evaluation value was，Is humidity,Is the humidity change rate; here we assume that the absolute value of the humidity change rate is less than 1; the larger the humidity evaluation value is, the larger the adverse effect of the comprehensive condition of the humidity of the environment on the monitoring effect of the temperature sensor is.
The acquisition logic of the illuminance value is as follows:
And selecting a proper illuminance sensor according to application requirements. Common illuminance sensors include photoresistors, photodiodes, and the like.
The illuminance sensor is installed in the same environment as the temperature sensor, ensuring that the sensor is exposed to the area where the optical radiation is to be measured.
Reading illuminance data: reading illuminance by an illuminance sensor, wherein the illuminance value is the average value of the illuminance of T in time; the illuminance value is expressed in Lux (Lux) units.
The greater the illuminance value, the temperature response of the temperature sensor may change under the effect of illumination radiation when the temperature sensor is in operation, so that the output signal of the sensor may drift, which may affect the stability and accuracy of the temperature sensor, and the detection and reaction speed of the sensor to the temperature change may be slow.
The data processing module calculates a temperature sensing state evaluation coefficient through normalization processing on the contact pressure ratio, the comprehensive precision evaluation value, the humidity evaluation value and the illuminance value acquired by the information acquisition module, and the expression is as follows:
; wherein, For the temperature-sensitive state evaluation coefficient,Is the illuminance value,In order to integrate the accuracy evaluation value,Preset proportionality coefficients of contact pressure ratio, comprehensive precision evaluation value, humidity evaluation value and illuminance value respectively, andAre all greater than 0.
The smaller the temperature sensing state evaluation coefficient is, the worse the state of the temperature sensor is when the two-way quick charge is monitored by the simulation test.
Setting a first temperature sensing state judgment threshold and a second temperature sensing state judgment threshold, wherein the first temperature sensing state judgment threshold is smaller than the second temperature sensing state judgment threshold; the setting of the first temperature sensing state judgment threshold and the second temperature sensing state judgment threshold is set according to the magnitude of the temperature sensing state evaluation coefficient and actual conditions such as the model, the running state and the test requirement of the temperature sensor in practice, and the like, and will not be repeated here.
The real-time test state module judges the state of the temperature sensor during monitoring when the two-way quick charge is subjected to the simulation test according to comparison of the temperature sensing state evaluation coefficient and the temperature sensing state judgment first threshold value and the temperature sensing state judgment second threshold value, so that the accuracy and the instantaneity of the temperature measurement of the temperature sensor during the two-way quick charge is ensured.
When the temperature sensing state evaluation coefficient is larger than the temperature sensing state judgment second threshold value, the real-time test state module generates a primary state early warning signal; at the moment, the temperature sensor is better in monitoring state when the two-way quick charge is subjected to the simulation test, the temperature sensor can accurately monitor the change condition of the temperature of the two-way quick charge simulation test, the accuracy and the instantaneity are higher, and no measures are needed at the moment.
When the temperature sensing state evaluation coefficient is smaller than or equal to the temperature sensing state judgment second threshold value and is larger than or equal to the temperature sensing state judgment first threshold value, the real-time test state module generates a secondary state early warning signal; at this time, the state of the temperature sensor when the two-way quick charge is monitored is general, and the condition that the temperature sensor is unstable in monitoring is more likely to exist in the whole two-way quick charge simulation test process.
When the temperature sensing state evaluation coefficient is smaller than the temperature sensing state judgment first threshold value, the real-time test state module generates a three-level state early warning signal; at this time, the temperature sensor monitors the state when the two-way quick charge is in analog test, the temperature sensor cannot accurately monitor the change condition of the temperature of the two-way quick charge analog test, and the accuracy and the instantaneity are poor.
The higher the level of the state early warning signal, the worse the state of the temperature sensor is monitored when the two-way quick charge is subjected to the simulation test.
Through the judgment of the real-time test state module, the system can generate primary, secondary or tertiary state early warning signals for indicating the state of the temperature sensor, the early warning signals can help testers to timely identify the working state of the temperature sensor, corresponding measures are taken according to the early warning signals, and the accuracy and the reliability of the temperature sensor in the bidirectional quick-charging simulation test are ensured, so that the reliability of the test result is improved, errors and uncertainties are reduced, and the follow-up data analysis, decision making, adjustment and other works are supported.
Counting the total number of state early warning signals sent by the real-time test state module in time Q, and marking the number of generated primary state early warning signals, the number of generated secondary state early warning signals and the number of generated tertiary state early warning signals as E1, E2 and E3 respectively.
The monitoring effect judging module judges the effectiveness of the monitoring result of the temperature sensor according to the number of the generated primary state early-warning signals, the number of the generated secondary state early-warning signals and the number of the generated tertiary state early-warning signals.
When E3 is more than or equal to 1, the monitoring effect judging module generates a replacement signal, directly replaces the temperature sensor, and carries out bidirectional quick-charging simulation test again after replacing the temperature sensor.
And judging the effectiveness of the quantity of the secondary state early warning signals on the monitoring result of the temperature sensor.
When (when)And at the moment, the monitoring effect judging module generates replacement signals and replaces the temperature sensor, and the temperature sensor is unstable in monitoring due to the fact that the number of the generated secondary state early warning signals is large, and the temperature monitoring result obtained by the bidirectional quick-charging simulation test is inaccurate and the monitoring result effectiveness is poor.
When (when)At this time, calculating the interval time of every two adjacent secondary state early warning signals; calculating the number of cases that the interval time of two adjacent secondary state early warning signals is longer than the safety preset time, and when the number of cases that the interval time of two adjacent secondary state early warning signals is longer than the safety preset time is longer than the preset safety number, the effectiveness of the monitoring result is poor, the monitoring effect judging module generates a replacement signal, and the temperature sensor is replaced at the moment; when the number of the conditions that the interval time of two adjacent secondary state early warning signals is larger than the safety preset time is smaller than or equal to the preset safety number, the effectiveness of the monitoring result is common, and no measures are needed.
The EM is a signal duty ratio threshold, which is set by a person skilled in the art according to the actual situation, and the safety preset time and the preset safety number are set according to the actual situation of the temperature sensor in the actual situation, which are not described herein.
The validity and the reliability of the monitoring result of the temperature sensor are timely identified through the analysis and the judgment of the quantity of the state early warning signals, and corresponding measures are taken to ensure the accuracy and the reliability of the testing result, improve the testing effect and the reliability of data, and ensure the normal work of the temperature sensor and the successful implementation of the testing.
The above formulas are all formulas with dimensionality removed and numerical calculation, the formulas are formulas with the latest real situation obtained by software simulation through collecting a large amount of data, and preset parameters and threshold selection in the formulas are set by those skilled in the art according to the actual situation.
The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more sets of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.
Those of ordinary skill in the art will appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system, apparatus and module may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The outdoor high-power bidirectional quick-charging mobile power supply testing system is characterized by comprising a data processing module, an information acquisition module, a real-time testing state module and a monitoring effect judging module, wherein the information acquisition module, the real-time testing state module and the monitoring effect judging module are in communication connection with the data processing module;
The information acquisition module acquires self-state information and outdoor environment influence information, sends the self-state information and the outdoor environment influence information to the data processing module, and calculates to obtain a temperature sensing state evaluation coefficient;
The real-time test state module sends state early warning signals of different grades through comparison of the temperature sensing state evaluation coefficient and the temperature sensing state judgment first threshold value and the temperature sensing state judgment second threshold value;
The monitoring effect judging module judges the accuracy of the temperature sensor in the bidirectional quick-charging simulation test according to the number of the generated primary state early-warning signals, the number of the generated secondary state early-warning signals and the number of the generated tertiary state early-warning signals;
the self state information includes contact pressure ratio and accuracy assessment index;
the acquisition logic of the contact pressure ratio is:
the contact pressure is as follows: ; wherein R is the actual resistance value of the piezoresistor; r0 is a reference resistance value of the piezoresistor in a non-pressure state; s is the sensitivity of the piezoresistor;
contact pressure ratio of ; WhereinFor contact pressure ratio,The contact pressure is preset;
The acquisition logic of the precision evaluation index is as follows:
calculating the variation of the output voltage and the variation of the temperature output by the temperature sensor in time t;
The precision evaluation index is as follows ; WhereinFor the variation of output voltage,The output temperature variation;
calculating the precision evaluation index in each time T, acquiring the maximum precision evaluation index in the time T, and calculating the average value of the precision evaluation indexes in the time T; the comprehensive precision evaluation value is the product of the maximum precision evaluation index in the time T and the average value of the precision evaluation indexes in the time T;
the outdoor environmental impact information includes a humidity evaluation value and an illuminance value;
The humidity evaluation value acquisition logic is as follows:
acquiring a numerical value of humidity in the environment based on the humidity sensor;
calculating the humidity change rate: the value obtained by subtracting the previous humidity from the current humidity is divided by the previous humidity, and the humidity change rate is obtained;
The humidity evaluation value was ，Is humidity,Is the humidity change rate;
The data processing module calculates a temperature sensing state evaluation coefficient through normalization processing on the contact pressure ratio, the comprehensive precision evaluation value, the humidity evaluation value and the illuminance value acquired by the information acquisition module, and the expression is as follows:
；
Wherein, For the temperature-sensitive state evaluation coefficient,Is the illuminance value,In order to integrate the accuracy evaluation value,Preset proportionality coefficients of contact pressure ratio, comprehensive precision evaluation value, humidity evaluation value and illuminance value respectively, andAre all greater than 0.
2. The outdoor high-power bidirectional fast-charging mobile power supply testing system according to claim 1, wherein: setting a first temperature sensing state judgment threshold value and a second temperature sensing state judgment threshold value, wherein the first temperature sensing state judgment threshold value is smaller than the second temperature sensing state judgment threshold value;
When the temperature sensing state evaluation coefficient is larger than the temperature sensing state judgment second threshold value, the real-time test state module generates a primary state early warning signal; when the temperature sensing state evaluation coefficient is smaller than or equal to the temperature sensing state judgment second threshold value and is larger than or equal to the temperature sensing state judgment first threshold value, the real-time test state module generates a secondary state early warning signal; when the temperature sensing state evaluation coefficient is smaller than the temperature sensing state judgment first threshold value, the real-time test state module generates a three-level state early warning signal.
3. The outdoor high-power bidirectional fast-charging mobile power supply testing system according to claim 2, wherein: counting the total number of state early warning signals sent by the real-time test state module in time Q, and marking the number of generated primary state early warning signals, the number of generated secondary state early warning signals and the number of generated tertiary state early warning signals as E1, E2 and E3 respectively;
when E3 is more than or equal to 1, the monitoring effect judging module generates a replacement signal;
When (when) The monitoring effect judging module generates a replacement signal;
When (when) Calculating the interval time of each two adjacent secondary state early warning signals; calculating the number of cases that the interval time of two adjacent secondary state early warning signals is larger than the safety preset time, and generating a replacement signal by the monitoring effect judging module when the number of cases that the interval time of two adjacent secondary state early warning signals is larger than the safety preset time is larger than the preset safety number;
EM is the signal duty cycle threshold.
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