CN107728047B - Relay test method, apparatus, relay, storage medium and equipment - Google Patents
Relay test method, apparatus, relay, storage medium and equipment Download PDFInfo
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- CN107728047B CN107728047B CN201710713494.1A CN201710713494A CN107728047B CN 107728047 B CN107728047 B CN 107728047B CN 201710713494 A CN201710713494 A CN 201710713494A CN 107728047 B CN107728047 B CN 107728047B
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides a kind of relay test method, apparatus, relay, storage medium and equipment.Wherein relay test method includes: to preset detection cycle, the operating current initial value of air-conditioning is detected at the beginning of the detection cycle and issues open command to relay, detects the operating current final value of air-conditioning again in the finish time of the detection cycle；Judge whether the relay is abnormal according to the operating current final value and the operating current initial value.Technical solution provided by the invention can automatically detect out whether the components such as relay damage by the relative variation of detection electric current, improve equipment reliability of operation；Without additionally increasing device cost, it need to only pass through program and algorithm optimization logic；It detects simultaneously more acurrate more intelligent, and can be carried out quick judgement.
Description
Technical field
The present invention relates to technical field of electric appliances more particularly to a kind of relay test method, apparatus, relay, storage Jie
Matter and equipment.
Background technique
Existing some electrical equipments do not have preferable control method for relay damaged, by taking air conditioner as an example, when after
The start-stop of air conditioner is unable to control after electric appliance damage, it is larger to the reliability effect of air-conditioning.And current detection method is usually
Inferred by detection electric current, temperature, since overcurrent protector induced current precision is insufficient (tolerance even ampere), is easy
It judges by accident.There are certain service life for relay in air-conditioning, and after being damaged, controller can not intelligent automatic identification and timely
It disconnects, leads to quality problems.
Summary of the invention
It is a primary object of the present invention to overcome the defect of the above-mentioned prior art, provide a kind of relay test method,
Device, relay, storage medium and equipment, to solve the problems, such as that relay failure can not be detected accurately.
One aspect of the present invention provides a kind of relay test method, comprising: detection cycle is preset, in the detection
The operating current initial value of air-conditioning is detected at the beginning of period and issues open command to relay, in the knot of the detection cycle
The beam moment detects the operating current final value of air-conditioning again；Institute is judged according to the operating current final value and the operating current initial value
Whether abnormal state relay.
Optionally, described to judge whether the relay is different according to the operating current final value and the operating current initial value
It often include: to judge that the relay is abnormal if the relative variation of electric current is less than or equal to preset outlier threshold, the electric current
Relative variation be the operating current final value and the operating current initial value absolute value of the difference and the operating current at the beginning of
The ratio between value.
Optionally, the value range for further including the outlier threshold is 0.4-0.5.
Optionally, the value range of the detection cycle is 10min-30min.
Optionally, described to judge whether the relay is different according to the operating current final value and the operating current initial value
Often further include: judge that the relay is normal if the relative variation of electric current is equal to 1.
Optionally, further includes: default detection times N；If n times judge that the relay is abnormal, it is determined that the relay
Damage.
Optionally, the value range of N is 1-8.
Optionally, further includes: setting protector, the protector are connected with the relay；Detecting the relay
When device exception or when n times detect the relay exception, the protector is disconnected and/or is provided prompt information,
In, N is preset detection number.
Another aspect of the present invention provides a kind of electric relay detection device again, comprising: detection unit, for presetting
Detection cycle detects the operating current initial value of air-conditioning at the beginning of the detection cycle and refers to relay sending disconnection
It enables, detects the operating current final value of air-conditioning again in the finish time of the detection cycle；Judging unit, for according to the work
Make electric current final value and the operating current initial value judges whether the relay is abnormal.
Optionally, the judging unit is also used to: if the relative variation of electric current is less than or equal to preset outlier threshold
Judge that the relay is abnormal, the relative variation of the electric current be the operating current final value and the operating current initial value it
The ratio between absolute value of the difference and the operating current initial value.
Optionally, the value range for further including the outlier threshold is 0.4-0.5.
Optionally, the value range of the detection cycle is 10min-30min.
Optionally, the judging unit is also used to: judging the relay just if the relative variation of electric current is equal to 1
Often.
Optionally, the judging unit is also used to: default detection times N；If continuous n times judge that the relay is abnormal,
Then determine the relay damaged.
Optionally, the value range of N is 1-8.
Optionally, further include fault processing unit, be used for: setting protector, the protector are connected with the relay；
When detecting the relay exception or when n times detect the relay exception, the protector is disconnected and/or
Provide prompt information, wherein N is preset detection number.
Another aspect of the present invention provides a kind of relay again, has device described in any of the above embodiments.
Another aspect of the present invention provides a kind of relay again, including processor, memory and is stored in memory
On the computer program that can run on a processor, the processor realizes any of the above-described the method when executing described program
Step.
Another aspect of the present invention provides a kind of equipment again, has relay described in any of the above embodiments.
Optionally, the equipment is air-conditioning.
Another aspect of the invention provides a kind of computer readable storage medium again, is stored thereon with computer program,
The step of any of the above-described the method is realized when described program is executed by processor.
Technical solution provided by the invention can automatically detect out the members such as relay by the relative variation of detection electric current
Whether device damages, and improves equipment reliability of operation；Without additionally increasing device cost, it need to only pass through program and algorithm optimization
Logic；It realizes that detection is more acurrate more intelligent simultaneously, and can be carried out quick judgement；Optimization is designed and controlled by circuit loop,
Warning is quickly protected and issued after identification relay damaged and reminds maintenance notice, improves the operational reliability of system.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the general frame figure of relay test method provided by the invention；
Fig. 2 is the mounting structure schematic diagram of the relay of relay test method provided by the invention；
Fig. 3 is a kind of flow chart of preferred embodiment of relay test method provided by the invention；
Fig. 4 is the structural schematic diagram of the error protection of relay test method provided by the invention；
Fig. 5 is the general frame figure of electric relay detection device provided by the invention；
Fig. 6 is a kind of structural schematic diagram of preferred embodiment of electric relay detection device provided by the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
One aspect of the present invention provides a kind of relay test method.Fig. 1 is relay test method provided by the invention
General frame figure.As shown in Figure 1, invention relay detection method includes: step S110, detection cycle is preset,
The operating current initial value of air-conditioning is detected at the beginning of the detection cycle and issues open command to relay, in the detection
The finish time in period detects the operating current final value of air-conditioning again；Step S120, according to the operating current final value and described
Operating current initial value judges whether the relay is abnormal.
The fault detection of conventional relays is only judged by judging whether electric current is 0, if relay occur it is slight
Adhesion, multiple spot intermittent contact can then judge by accident because this constantly has an electric current, when no current, when only according to judging in a flash
The method precision whether electric current is 0 is inadequate.The present invention according to the operating current final value and the operating current initial value detection after
The accuracy of apparatus failure, testing result is higher.By taking the application of air-conditioning as an example, technical solution provided by the invention is by setting
More accurate algorithm logic is set, to the compound action of air-conditioning current protector and mainboard programmed logic etc., fast accurate identification is sentenced
Whether disconnected relay damages.
Fig. 2 is the mounting structure schematic diagram of the relay of relay test method provided by the invention.It is shown in Fig. 2 to set
Standby label is as follows: 1 is the relay for controlling air-conditioning switch；2 be evaporator；3 be compressor；4 be condenser.Fig. 2 is still with air-conditioning
Application for, the relay in diagram is connected with evaporator, in time detect relay working condition, sky can be improved
Adjust reliability of operation.
A kind of embodiment of relay test method according to the present invention, it is described according to the operating current final value and described
If operating current initial value judges whether the relay includes: the relative variation of electric current less than or equal to preset abnormal threshold extremely
Value then judges that the relay is abnormal, at the beginning of the relative variation of the electric current is the operating current final value and the operating current
The ratio between the absolute value of the difference of value and the operating current initial value.The value range of the outlier threshold is 0.4-0.5.Preferably,
The value of the outlier threshold is 0.5.The value range of the detection cycle is 10min-30min.
A kind of embodiment of relay test method according to the present invention, it is described according to the operating current final value and described
Operating current initial value judges whether the relay abnormal further include: judge if the relative variation of electric current is equal to 1 it is described after
Electric appliance is normal.
Still by taking air-conditioning as an example, under cryogenic conditions, the setting detection cycle time is T, and the detection time started is T0, and detection terminates
Time is T1, T=T1-T0；
The operating current of air-conditioning, i.e. operating current initial value are detected at the T0 moment, use I0It indicates；Air-conditioning is detected at the T1 moment
Operating current, i.e. operating current final value, use I1It indicates；The relative variation of electric current is △ I=(I1-I0)/IO；
At the T0 moment, air-conditioning, which issues instruction, allows relay to disconnect.There will be two kinds of situations:
If 1) relay is normal, instantaneously disconnect, at this time air-conditioning work electric current I when T00For a numerical value, such as 6A
(or other values), and at the end of detection cycle, electric current I1Essentially 0, then the relative variation △ I=(I of electric current1-I0)/IOBecome
To in 1, △ I=(I can consider within the scope of the limitation of apparatus measures accuracy1-I0)/IOEqual to 1.
If 2) relay damaged not will disconnect, air-conditioning electric current I when T0 at this time0For a numerical value, such as 6A, and
At the end of detection cycle, electric current I1Since the damage of relay failure will not be 0, due to poor contact, electric current in the section 0~6A,
The then relative variation △ I=(I of electric current at this time under normal circumstances1-I0)/IOMaximum value, that is, outlier threshold do not exceed
0.5 (according to the actual situation, maximum value may be between 0.4-0.5), because the time that judgement is spent every time is less, such as
50ms-1s, at this moment electric current moment, it is smaller to fall less than half possibility.The relative variation of electric current can tend in many cases,
In 0.Therefore rationally setting outlier threshold can reduce rate of false alarm and rate of failing to report, improve the accuracy of detection.
A kind of embodiment of relay test method according to the present invention, further includes: default detection times N；If n times judge
The relay is abnormal, it is determined that the relay damaged.The value range of N is 1-8.Preferably, N=5.Specifically, it can set
It is 5 times that regular inspection, which surveys number, and 5 testing results are respectively △ I1~△ I5If all there is the opposite of electric current in the result of 5 detections
Variable quantity △ I is intended to 0, then may determine that relay damaged.
It has been observed that conventional detection is only judged by judging whether electric current is 0, if mild adhesion occurs for relay,
Multiple spot intermittent contact can then judge by accident because at this time I1 when have an electric current, when no current, when only according to judging whether in a flash
The method precision that electric current is 0 is inadequate.And for air-conditioning, efficient type electric current is natively small, load is small, under low frequency,
Running current only has 1A or so, and erroneous judgement is easy when current inductor error is too big.And use the relative variation of electric current multiple
The way of comparison can reject the accidentalia of above-mentioned erroneous judgement.In addition, above-mentioned 6A is an assumption value, it is practical according to difference
Air-conditioning cold flow, electric current is different, I0Input value can be unrelated for arbitrary value and air-conditioning cold flow and actual motion value.The result of concern
It is that relative variation tends to 0 or 1, reaches general purpose of design.
A kind of embodiment of relay test method according to the present invention, further includes: setting protector, the protector with
The relay series connection.Fig. 3 is a kind of flow chart of preferred embodiment of relay test method provided by the invention.Such as Fig. 3
It is shown, it after step S120, further include step S130, when detecting the relay exception or n times detect institute
When stating relay exception, the protector is disconnected and/or is provided prompt information, wherein N is preset detection number.It is described
Providing prompt information includes: to show fault cues information by the display equipment of air-conditioning, issue fault cues by audio frequency apparatus
Sound, and/or fault cues information is provided by warning lamp, or transmits a signal on user mobile phone and relevant information is prompted to remind
User is handled in time.In another embodiment, can also directly control shutdown power-off by remote monitoring system to protect is
System safety.
Fig. 4 is the structural schematic diagram of the error protection of relay test method provided by the invention.Equipment shown in Fig. 4
Label is as follows: 1 is the relay for controlling air-conditioning switch；3 be compressor；5 be adhesion protector；6 be current sensor, for examining
Survey the operating current of air-conditioning；7 be inner blower；8 be outer blower；9 be pressure switch.Specifically, relay event is detected when effective
After barrier, power-off protection immediately is carried out by adhesion protector, and issue caution sound, user is reminded to report for repairment or repair.Pass through adhesion
Protector protects system safe in time, improves the reliability of system.
Another aspect of the present invention provides a kind of electric relay detection device again.Fig. 5 is relay inspection provided by the invention
Survey the general frame figure of device.As shown in figure 5, invention relay detection device includes: detection unit 100, for setting in advance
Determine detection cycle, the operating current initial value of air-conditioning is detected at the beginning of the detection cycle and refers to relay sending disconnection
It enables, detects the operating current final value of air-conditioning again in the finish time of the detection cycle；Judging unit 200, for according to institute
It states operating current final value and the operating current initial value judges whether the relay is abnormal.
A kind of embodiment of electric relay detection device according to the present invention, the judging unit 200 are also used to: if electric current
Relative variation is less than or equal to preset outlier threshold and then judges that the relay is abnormal, and the relative variation of the electric current is institute
State the absolute value of the difference and the ratio between the operating current initial value of operating current final value and the operating current initial value.
A kind of embodiment of electric relay detection device according to the present invention further includes that the value range of the outlier threshold is
0.4-0.5。
A kind of embodiment of electric relay detection device according to the present invention, the value range of the detection cycle are 10min-
30min。
A kind of embodiment of electric relay detection device according to the present invention, the judging unit 200 are also used to: if electric current
Relative variation is equal to 1 and judges that the relay is normal.
A kind of embodiment of electric relay detection device according to the present invention, the judging unit 200 are also used to: default detection
Times N；If n times judge that the relay is abnormal, it is determined that the relay damaged.
A kind of embodiment of electric relay detection device according to the present invention, the value range of N are 1-8.
Fig. 6 is a kind of structural schematic diagram of preferred embodiment of electric relay detection device provided by the invention.Such as Fig. 6 institute
Show, according to the present invention a kind of embodiment of electric relay detection device, further include fault processing unit 300, be used for: setting protection
Device, the protector are connected with the relay；When detecting the relay exception or n times detect the relay
When device exception, the protector is disconnected and/or is provided prompt information, wherein N is preset detection number.
Another aspect of the present invention provides a kind of relay again, has device described in any of the above embodiments.
Another aspect of the present invention provides a kind of relay again, including processor, memory and is stored in memory
On the computer program that can run on a processor, the processor realizes any of the above-described the method when executing described program
Step.
Another aspect of the present invention provides a kind of equipment again, has relay described in any of the above embodiments.According to this hair
A kind of embodiment of bright equipment, the equipment are air-conditioning.
Another aspect of the invention provides a kind of computer readable storage medium again, is stored thereon with computer program,
The step of any of the above-described the method is realized when described program is executed by processor.
Technical solution provided by the invention can automatically detect out the members such as relay by the relative variation of detection electric current
Whether device damages, and improves equipment reliability of operation；Without additionally increasing device cost, it need to only pass through program and algorithm optimization
Logic；It realizes that detection is more acurrate more intelligent simultaneously, and can be carried out quick judgement；Optimization is designed and controlled by circuit loop,
Warning is quickly protected and issued after identification relay damaged and reminds maintenance notice, improves the operational reliability of system.
Function described herein can be implemented in hardware, the software executed by processor, firmware or any combination thereof.
If implemented in the software executed by processor, computer can be stored in using function as one or more instructions or codes
It is transmitted on readable media or via computer-readable media.Other examples and embodiment are wanted in the present invention and appended right
It asks in the scope and spirit of book.For example, due to the property of software, function described above can be used by processor,
Hardware, firmware, hardwired or the software implementation for appointing the combination of whichever to execute in these.In addition, each functional unit can integrate
In one processing unit, it is also possible to each unit to physically exist alone, can also be integrated in two or more units
In one unit.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of unit or module
It connects, can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, and fill as control
The component set may or may not be physical unit, both can be located in one place, or may be distributed over multiple
On unit.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can for personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes: that USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic or disk etc. be various to can store program code
Medium.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (19)
1. a kind of relay test method characterized by comprising
Detection cycle is preset, the operating current initial value of air-conditioning is detected at the beginning of the detection cycle and to relay
Open command is issued, the operating current final value of air-conditioning is detected again in the finish time of the detection cycle, according to the work
Electric current final value and the operating current initial value judge whether the relay is abnormal；It is described according to the operating current final value and institute
State operating current initial value judge the relay whether include: extremely
Judge that the relay is abnormal if the relative variation of electric current is less than or equal to preset outlier threshold, the phase of the electric current
To the absolute value of the difference and the operating current initial value that variable quantity is the operating current final value and the operating current initial value it
Than.
2. the method according to claim 1, wherein further include the outlier threshold value range be 0.4-
0.5。
3. the method according to claim 1, wherein the value range of the detection cycle is 10min-30
min。
4. the method according to claim 1, wherein described according to the operating current final value and work electricity
Stream initial value judges whether the relay is abnormal further include: is judging the relay just if the relative variation of electric current is equal to 1
Often.
5. the method according to claim 1, wherein further include:
Default detection times N；
If n times judge that the relay is abnormal, it is determined that the relay damaged.
6. according to the method described in claim 5, it is characterized in that, the value range of N is 1-8.
7. method according to claim 1 to 6, which is characterized in that further include:
Protector is set, and the protector is connected with the relay；
When detecting the relay exception or when n times detect the relay exception, the protector is disconnected
And/or provide prompt information, wherein N is preset detection number.
8. a kind of electric relay detection device characterized by comprising
Detection unit detects the operating current of air-conditioning for presetting detection cycle at the beginning of the detection cycle
Initial value simultaneously issues open command to relay, whole in the operating current that the finish time of the detection cycle detects air-conditioning again
Value,
Judging unit, for judging whether the relay is different according to the operating current final value and the operating current initial value
Often；
The judging unit is also used to: judging the relay if the relative variation of electric current is less than or equal to preset outlier threshold
Device is abnormal, the relative variation of the electric current be the operating current final value and the operating current initial value absolute value of the difference with
The ratio between described operating current initial value.
9. device according to claim 8, which is characterized in that the value range for further including the outlier threshold is 0.4-
0.5。
10. device according to claim 8, which is characterized in that the value range of the detection cycle is 10min-30
min。
11. device according to claim 8, which is characterized in that the judging unit is also used to: if the opposite variation of electric current
Amount is equal to 1 and judges that the relay is normal.
12. device according to claim 8, which is characterized in that the judging unit is also used to:
Default detection times N；
If n times judge that the relay is abnormal, it is determined that the relay damaged.
13. device according to claim 12, which is characterized in that the value range of N is 1-8.
14. device according to claim 8, which is characterized in that further include fault processing unit, be used for:
Protector is set, and the protector is connected with the relay；
When detecting the relay exception or when n times detect the relay exception, the protector is disconnected
And/or provide prompt information, wherein N is preset detection number.
15. a kind of relay, which is characterized in that have the device as described in any one of claim 8-14.
16. a kind of relay, which is characterized in that on a memory can be on a processor including processor, memory and storage
The step of computer program of operation, the processor realizes claim 1-7 any the method when executing described program.
17. a kind of equipment, which is characterized in that have such as the described in any item relays of claim 15 or 16.
18. equipment according to claim 17, which is characterized in that the equipment is air-conditioning.
19. a kind of computer readable storage medium, which is characterized in that be stored thereon with computer program, described program is processed
The step of claim 1-7 any the method is realized when device executes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710713494.1A CN107728047B (en) | 2017-08-18 | 2017-08-18 | Relay test method, apparatus, relay, storage medium and equipment |
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| CN201710713494.1A CN107728047B (en) | 2017-08-18 | 2017-08-18 | Relay test method, apparatus, relay, storage medium and equipment |
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| CN107728047B true CN107728047B (en) | 2019-09-03 |
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| CN112735078B (en) * | 2020-12-24 | 2021-10-26 | 中标慧安信息技术股份有限公司 | Intelligent home management method and system of Internet of things |
| CN112954575A (en) * | 2021-01-28 | 2021-06-11 | 歌尔科技有限公司 | Wireless earphone fault detection method, fault detection equipment and wireless earphone |
| CN113296555B (en) * | 2021-05-26 | 2023-05-05 | 广东电网有限责任公司 | Method and device for operating oil pressure quick-acting relay for digital transformer |
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| US7403368B2 (en) * | 2004-06-04 | 2008-07-22 | Eaton Corporation | Devices and methods for detecting operational failures of relays |
| CN103426682A (en) * | 2012-05-15 | 2013-12-04 | 赵旭阳 | Relay with safety device and relay safety device |
| CN103344913B (en) * | 2013-07-30 | 2015-12-02 | 中国人民解放军第二炮兵装备研究院第三研究所 | A kind of electromagnetic relay checkout equipment and method |
| CN104698373A (en) * | 2013-12-10 | 2015-06-10 | 北汽福田汽车股份有限公司 | Battery pack relay life monitoring method and apparatus |
| JP5660236B1 (en) * | 2014-02-27 | 2015-01-28 | オムロン株式会社 | Abnormality detection method for electromagnetic relay, abnormality detection circuit for electromagnetic relay, and abnormality detection system |
| CN104833911A (en) * | 2014-05-21 | 2015-08-12 | 北汽福田汽车股份有限公司 | Fault determining method of relay in power battery, and device |
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