CN113848498A - Method for verifying slow-falling and slow-rising test capability of power supply voltage of road vehicle electrical and electronic equipment - Google Patents
Method for verifying slow-falling and slow-rising test capability of power supply voltage of road vehicle electrical and electronic equipment Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a method for verifying the slow-falling and slow-rising test capability of the power supply voltage of electrical and electronic equipment of a road vehicle, which adopts a capability verification device which can send out indication signals when the voltage rises or falls to a specific value. The capability verification method does not depend on the acquisition of voltage waveform data, and can avoid various problems faced when the laboratory capability is evaluated by directly using the voltage waveform data.
Description
Technical Field
The invention relates to the technical field of capability verification, in particular to a method for verifying the capability of a slow-falling and slow-rising test of the power supply voltage of electric and electronic equipment of a road vehicle.
Background
Capability verification is an activity that utilizes inter-laboratory comparisons to determine the calibration, detection capabilities of participating laboratories. Capacity verification activities refer to any inter-laboratory alignment or measurement audit used to evaluate the capacity of participating laboratories. Such as a capacity verification plan or activity operated by a national or regional approval agency and its cooperative organization, government department, or industry organization.
The capability verification is used as an important measure for the external quality control of the laboratory and an important and effective means for judging and monitoring the quality control level of the laboratory, and is beneficial to promoting the capability construction of a qualified evaluation organization. Meanwhile, capability verification is one of the main ways of CNAS (national acceptance committee for qualification) to evaluate the capability of the qualification organization, and is also a common way for laboratories to maintain the qualification of CNAS. Through the verification of the participation capacity, whether laboratory testing personnel, equipment, environment, methods and the like meet the standard requirements of the test can be comprehensively inspected, and the participation laboratory can know the self detection capacity and the overall detection level of the whole industry. The participants with unsatisfactory results can find problems from the results and take effective measures to modify the results so as to ensure the accuracy of the daily detection results in the future.
Developing capability verification activities has positive effects on related aspects related to detection or calibration, is a method for improving the internal quality control effect of a laboratory through external measures, is an important supplement of the approved review technology of the laboratory, and is one of the bases for maintaining international mutual approval among approved institutions; for the accreditation institution, is an important technical approach to evaluate the accreditation laboratory testing or calibration capability; for the clients of the laboratory, the method is an important basis for proving that the laboratory has certain detection capability; for government authorities, the method is an effective measure for supervising laboratory capacity and level. Therefore, at present, the ability verification activities are increasingly widely applied both internationally and domestically.
The slow-decreasing and slow-increasing test of the power supply voltage of the road vehicle electrical and electronic equipment is carried out according to the clause 4.5 of the international standard ISO16750-2 and the clause 4.5 of the national standard GB/T28046.2, and aims to simulate the voltage change process of the equipment and judge whether the equipment meets the requirement of the function level in the charging and discharging process of a storage battery of the road vehicle electrical and electronic equipment. The system is used as a part of the environmental conditions and tests of the vehicle-mounted electric and electronic equipment, and provides a basic framework for different manufacturers, organizations and customers to compare the performance of the vehicle-mounted electric and electronic equipment; and is also the basis for product realization compatibility and replaceability. Particularly, in the era of rapid and diversified development of electric vehicles, it is important to accurately test the performance of electrical and electronic equipment according to a unified standard and a test method.
Standard GB/T28046.2 and ISO16750-2 clause 4.5 require the participating laboratory to select a specified minimum supply voltage U according to the nominal voltage of the on-board electrical and electronic devicesminThe device under test is powered down to 0 and then up from 0 to U at a linear rate of change of 0.5 + -0.1V/min or in steps of not more than 25mVsminAnd thus, whether the vehicle-mounted electric and electronic equipment can meet the requirement of the product function level, namely the 4.5.3 clause of the standard GB/T28046.2, when the terminal condition such as charging and discharging of a storage battery is carried out.
Unlike the slow-decreasing and slow-increasing tests of the power supply voltage of the road vehicle electrical and electronic equipment, the capability verification needs to compare the deviation of the results of the participating laboratories with the specified values or uncertainty so as to judge whether the participating laboratories have the capability of performing the slow-decreasing and slow-increasing tests of the power supply voltage of the road vehicle electrical and electronic equipment according to the requirements of the standard GB/T28046.2 and the clause 4.5 of ISO 16750-2.
The test result participating in the laboratory is a voltage waveform, belongs to sequence data, and if the voltage waveform is used for evaluating the capability of the voltage waveform to perform slow-down and slow-up tests, the voltage waveform needs to be as follows:
1) a feasible and uniformly specified sequence data analysis method;
2) all participating laboratories, which were capacity-verified, provided specific data points of the voltage waveform.
However, the two requirements are difficult to implement for the following reasons:
1) standards GB/T28046.2 and ISO16750-2 do not provide a specific method for evaluating the accuracy of test results;
2) statistical method standard for capability verification ISO 13528: 2015 and GB/T28043-2019 lack the provision of methods for statistical analysis of sequence data;
3) directly from the sequence voltage data, it is difficult to calculate the specified values, uncertainty, for the capability assessment of the participating laboratories.
It is inconvenient for the participating laboratories to require that they provide all the data points of the voltage waveform, and also affects the comparability of the results:
1) some oscilloscopes cannot derive a specific data point;
2) the resolution of the testing equipment is different, so the minimum interval (interval) of the derived data is also different, which causes the number of result data points of different laboratories to be different, thereby affecting the comparability of the laboratories;
3) in some oscilloscope devices, in order to improve the resolution, an interpolation method is often adopted to generate fitting data by using linear interpolation and spline interpolation according to sampling data, so that the resolution is improved. The waveform is also affected slightly by the different interpolation methods of the device.
In conclusion, if the output waveform is directly used as the capability of evaluating whether the laboratory has the power supply voltage slowly-decreasing and slowly-increasing tests according to the standard GB/T28046.2 or ISO16750-2, the capability is not inexhaustible. Further, the ability verification statistical evaluation using waveform data lacks a standard for the ability verification statistical evaluation.
Disclosure of Invention
The invention aims to provide a method for verifying the slow-falling and slow-rising test capability of the power supply voltage of the road vehicle electrical and electronic equipment independent of voltage waveform data, so that various problems required to be faced when the voltage waveform is directly used for evaluating the capability of a laboratory are avoided.
The purpose of considering the capability verification is to assess whether the participating laboratories have the capability of carrying out the test according to the standard GB/T28046.2 or ISO 16750-2. Therefore, the center of gravity should be examined to determine whether the participating laboratories can stably adjust the supply voltage at the specified transformation rate. However, if the entire supply voltage waveform is detected to determine the transformation rate, the above-described difficulty cannot be overcome.
In view of the above, the technical scheme adopted by the invention is as follows: a method for verifying the slow-falling and slow-rising test capability of the power supply voltage of electric and electronic equipment of a road vehicle comprises the following steps:
a participating laboratory applies a specified power supply voltage U to the capacity verification device, stably reduces the power supply voltage from U to 0 according to a specified transformation rate H, and stably increases the power supply voltage from 0 to U according to the same transformation rate, and records a time interval T of sending an indication signal twice by the capacity verification device in the boosting and reducing processes;
the capability verification apparatus has the following characteristics: when the power supply voltage of the power supply device drops to a voltage value V1 and rises to a voltage value V2, indication signals are respectively sent out.
The principle of capability verification of the scheme of the invention is as follows, because the capability verification device of the invention can send out an indication signal when the power supply voltage value is specific, if the power supply voltage drops and rises to a specific value, the display screen of the capability verification device can be extinguished and lightened, so that the deviation of the time T from the extinction to the lightening of the display screen of the acquisition device and the specified value can be judged, namely whether the participating laboratory can stably adjust the power supply voltage of the capability verification device at the specified transformation rate, and further whether the capability of carrying out the gradual voltage drop and gradual rise test of the power supply voltage of the road vehicle electrical and electronic equipment is provided.
The capacity verification device is provided with an undervoltage protection circuit and an overvoltage protection circuit, the function grade of the capacity verification device is C grade, namely in the test process, if one or more functions of the capacity verification device do not meet the design requirements, all the tested functions can be automatically recovered and normally operated.
The capability verification method also comprises the following steps which can help to improve the accuracy of the capability verification result of the participating laboratory:
the method of the invention also requires participation in a laboratory record stationThe capability verification device sends out indication signals such as power supply voltages U1 and U2 corresponding to the display screen which is turned off and turned on twice. According to the power supply voltages U1 and U2 provided by a laboratory and the time T from the turning-off to the turning-on of the display screen, if the deviation of the T and the specified value is large, according to the transformation rate estimation formula in the test process
If the provided U1, U2 and the capability verification device indication signal operating conditions V1 and V2 differ significantly, the deviation of the laboratory result T from the specified value may be caused by a failure of the capability verification device or an incorrect laboratory test procedure.
The capacity verification method also comprises a step of obtaining a result waveform of the participating laboratory, wherein the waveform is used for confirming whether the participating laboratory stably adjusts the slow reduction and slow rise of the power supply voltage according to the linear transformation rate.
The capability verification method further includes the step of obtaining an image of a participating laboratory test procedure. The test images are used for knowing details of the test process of the participating laboratory, summarizing the influence of different test equipment on the measurement result, and assisting in analyzing the reason why the difference between the result T of the participating laboratory and the specified value is large.
The capacity verification method further comprises the step of acquiring latest verification data of the measuring device when the supply voltage of the participating laboratories is gradually reduced to a gradual increase.
Has the advantages that:
1) the capacity verification method of the invention examines whether the participating laboratories have the capacity of carrying out the test in the standard GB/T28046.2 or ISO16750-2 by examining whether the participating laboratories can adjust the power supply voltage at the specified transformation rate, and specifically, by measuring the interval time T of the capacity verification device sending the indication signal twice in the process of slowly reducing and slowly increasing the power supply voltage, comparing the deviation of the time T and the specified value (time), and judging whether the participating laboratories can stably adjust the slowly reducing and slowly increasing of the power supply voltage at the specified transformation rate. The capability verification method does not depend on the acquisition of voltage waveform data, and can avoid various problems faced when the laboratory capability is evaluated by directly using the voltage waveform data.
2) Because the systematic error belongs to a regular error, the error is characterized in that the magnitude and the sign of the error value are kept unchanged in the repeated test process. Therefore, the time required by the display screen of the capacity verification device to be extinguished in the voltage reduction process to be lightened in the voltage boosting process, namely the difference between the two moments, is used as a result of participating in a laboratory, so that the system error brought by the voltage test of the participating laboratory can be effectively eliminated, and the time T can correctly reflect the transformation rate of the participating laboratory.
Drawings
FIG. 1 is a schematic structural diagram of a capability verification apparatus according to an embodiment of the present invention;
fig. 2 is a test flow chart of a capability verification plan for slow-down and slow-up tests of electrical and electronic equipment of a road vehicle.
Detailed Description
The capability verification device used in the method for verifying the power supply voltage slow-falling and slow-rising test capability of the road vehicle electrical and electronic equipment is shown in figure 1 and is an air conditioner controller test box which is composed of a shell 9 and a vehicle-mounted air conditioner controller module arranged in the shell 9, wherein a red input terminal 1 connected with the positive pole of a power supply circuit of the vehicle-mounted air conditioner controller module and a black input terminal 2 connected with the negative pole of the power supply circuit of the vehicle-mounted air conditioner controller module are arranged on the shell 9. 3/4 is a wind speed adjusting switch, 5 is a refrigeration mode switch, 6 is a face/foot blowing mode switch, 7/8 is a temperature adjusting switch, which is respectively a temperature increasing switch and a temperature decreasing switch, and the temperature increasing switch and the temperature decreasing switch are control keys on the vehicle-mounted air conditioner controller module, and 10 is a display screen of the vehicle-mounted air conditioner controller module. An under-voltage protection circuit and an over-voltage protection circuit are arranged in the vehicle-mounted air conditioner controller module, the function grade of the device is C grade, namely in the test process, if one or more functions of the capability verification device do not meet the design requirements, all tested functions can be automatically recovered and normally operated.
The air conditioner controller test box has the following characteristics: when the power supply voltage is reduced to be close to 9.0V, the current flowing through the capability verification device suddenly changes, and the display screen of the device suddenly extinguishes; when the supply voltage rises to approximately 9.5V, the current through the device again jumps, at which time the display screen of the device lights up again.
The device for verifying the slow reduction and slow rise capacity of the power supply voltage of the road vehicle in the embodiment is suitable for environmental conditions and test part 2 of road vehicle electrical and electronic equipment in standard GB/T28046.2-2019: electrical loads and ISO 16750-2:2012 Road vehicles-Environmental conditions and testing for electronic and electronic Equipment Part 2: electronic loads develop capability verification projects.
The device in this embodiment overall structure is simple, and is with low costs, and is small, conveniently accomodates and transports.
Of course, the capability verification device in the capability verification method of the present invention is not limited to the above, and it should be noted that the capability verification device also has the following characteristics:
when the power supply voltage of the capability verification device drops and rises to a specific value, an explicit indication signal can be given. The above indication signal is to turn off or on the display screen, or to turn off or on the indicator light, or to provide a sound prompt signal, or even to output a corresponding pulse signal. The characteristic value should be a relatively fixed value. In addition, the vehicle-mounted electrical and electronic equipment should be selected to better meet the requirements of the relevant standards.
The following are the detection steps of the capability verification device:
1. the air conditioner controller test box is placed for 1 hour at the temperature of 23 +/-2 ℃ and in the environment with the humidity of 45-75% (without power supply) to reach the thermal balance.
2. Applying a direct current voltage of 10.5V between red and black input terminals of a test box of the air conditioner controller, checking whether a display screen is lightened, starting the test if the display screen is normally lightened, and adjusting keys of the test box to a refrigeration mode, a face blowing mode, a maximum temperature gear and a maximum wind speed gear respectively.
3. The test was started with the following steps:
1) applying a power supply voltage of 10.5V to the capability verification device;
2) reducing the power supply voltage to 0 at a specified rate, typically 0.5 + -0.1V/min;
3) recording the moment t1 when the display screen 10 is turned off;
4) boosting the supply voltage to 10.5V at a specified rate;
5) recording the time t2 at which the display screen 10 is lit;
6) the output T-T2-T1.
In order to ensure the successful implementation of the capacity verification plan, a plurality of capacity verification samples need to be prepared and distributed to different laboratories. Therefore, alignment of sample identity is crucial for capacity validation. In implementing the capacity verification plan, it is ensured that unsatisfactory results occur that are not attributable to sample-to-sample variability. Therefore, the uniformity of the energy-verifying sample needs to be examined.
According to the design requirements of the device, 20 samples are ordered to carry out uniformity full-inspection, DC10.5V test voltage is selected, the test is repeated for 2 times for each sample, and 16 samples meeting the requirements are selected for the plan. The sample homogeneity test results data are shown in table 1:
TABLE 1
Results of one-way anova of the samples:
1.45<critical value F0.05(15,16)＝2.35
The calculated F statistic value is less than the F threshold value, indicating that at the 0.05 significance level, the ramp down of the supply voltage to the ramp up test time T of the sample is uniform.
After selecting the qualified competence verification device, the qualified competence verification device is distributed to the laboratories participating in the competence verification plan. The test procedure was as follows:
1) applying a power supply voltage of 10.5V to the capability verification device;
2) reducing the power supply voltage to 0 at a specified rate, typically 0.5 + -0.1V/min;
3) recording the moment t1 when the display screen 10 is extinguished and the corresponding power supply voltage U1;
4) boosting the supply voltage to 10.5V at a specified rate;
5) recording the moment t2 when the display screen 10 is lit and the corresponding supply voltage U2;
6) the outputs T-T2-T1, U1 and U2.
In fact, the invention mainly judges whether the actual voltage regulation rate of the participating laboratory deviates from the specified voltage regulation rate through the time from the turning-off to the turning-on of the display screen in the voltage reduction and boosting processes of the recording capacity verification device, and evaluates the capacity of the device for carrying out the slow reduction and slow rise tests of the power supply voltage of the road vehicle electrical and electronic equipment. The power supply voltages U1 and U2 corresponding to the display screen being turned off and on obtained in the step 3 are used for analyzing reasons of unsatisfactory results in laboratories. In the test process, a picture of connection between the test equipment and the capability verification device is required to be shot, and meanwhile, in the process of slowly rising and slowly falling of the power supply voltage, the oscilloscope tracks the power supply voltage and displays the pictures of time readings, so that the capability verification provider can know the test details of the participating laboratory, and the influence of different measurement equipment on the test result is summarized and summarized.
In addition, when the test power supply voltage is slowly reduced to the slowly rising test time, a calibration '0' reading of the power supply and names, measuring ranges, precision and calibration reports of all instruments and equipment obtained in a laboratory are also required to be provided, so that the basis for analyzing unsatisfactory results or results with large deviation in the participating laboratory is provided.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions and alterations can be made to the above-described structure of the present invention without departing from the basic technical concept of the present invention as described above, according to the common technical knowledge and conventional means in the field of the present invention.
Claims (6)
1. A method for verifying the slow-falling and slow-rising test capability of the power supply voltage of electric and electronic equipment of a road vehicle is characterized by comprising the following steps:
a participating laboratory applies a specified power supply voltage U to the capacity verification device, stably reduces the power supply voltage from U to 0 according to a specified transformation rate H, and stably increases the power supply voltage from 0 to U according to the same transformation rate, and records a time interval T of sending an indication signal twice by the capacity verification device in the boosting and reducing processes;
the capability verification apparatus has the following characteristics: when the power supply voltage of the power supply device drops to a voltage value V1 and rises to a voltage value V2, indication signals are respectively sent out.
2. The method of claim 1, wherein the capability verification device is provided with an undervoltage and overvoltage protection circuit with a function level of class C.
3. The method of claim 1, further comprising the steps of: the participating laboratory records the corresponding power supply voltages U1 and U2 when the capability verification device sends out the indication signals twice, and the capability verification mechanism compares the difference between the capability verification device and the action voltages V1 and V2 of the indication signals of the capability verification device.
4. The method of claim 3, further comprising the step of obtaining a participant laboratory results waveform.
5. The method of claim 4, further comprising the step of obtaining an image of a participating laboratory test procedure.
6. The method of claim 5, wherein the capability verification method further comprises the step of obtaining latest verification data of the measuring device when the supply voltage of the participating laboratories decreases gradually to a gradual time.
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2021
- 2021-08-11 CN CN202110918504.1A patent/CN113848498A/en active Pending
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| US6586921B1 (en) * | 2000-05-12 | 2003-07-01 | Logicvision, Inc. | Method and circuit for testing DC parameters of circuit input and output nodes |
| CN205861870U (en) * | 2016-07-25 | 2017-01-04 | 公安部天津消防研究所 | Emergency lighting centrally connected power source comprehensive automation detecting system |
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