CN115758785A - Relay life prediction method, electronic device, and computer-readable storage medium - Google Patents
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Abstract
The application discloses a relay life prediction method, electronic equipment and a computer readable storage medium, wherein the relay life prediction method comprises the following steps: acquiring the total available times and the used times of a relay to be predicted; determining a service life influence coefficient of the relay, wherein the service life influence coefficient is determined by the working condition of the relay; correcting the used times by utilizing the service life influence coefficient; and predicting the service life of the relay according to the total available times and the corrected used times. By the above method, the service life of the relay can be predicted.
Description
Technical Field
The present disclosure relates to the field of relay technologies, and in particular, to a method for predicting a life of a relay, an electronic device, and a computer-readable storage medium.
Background
A relay (relay) is an electric control device that generates a predetermined step change in a controlled amount in an electric output circuit when a change in an input amount (excitation amount) meets a predetermined requirement. It has an interactive relationship between control coefficients (also called input loops) and controlled coefficients (also called output loops). It is usually applied in the automatic control circuit, which is actually an "automatic switch" that uses small current to control the operation of large current. Therefore, the circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like.
The relay generates a magnetic field through current to attract the armature to drive the contact to move so as to complete the switching action, the service life of the relay is reduced along with the increase of the on-off times of the relay, and the relay with the degraded service life can possibly cause a series of accidents such as fire disasters and the like. Therefore, reliable estimation of relay life plays an important role in safe driving and functional safety of the entire vehicle.
Disclosure of Invention
In order to solve the problems, the application provides a method for predicting the service life of a relay, which can predict the service life of the relay.
The technical scheme adopted by the application is as follows: provided are a relay life prediction method, an electronic device, and a computer-readable storage medium, the method including: acquiring the total available times and the used times of a relay to be predicted; determining a life influence coefficient of the relay, wherein the life influence coefficient is determined by the working condition of the relay; correcting the used times by utilizing the life influence coefficient; and predicting the service life of the relay according to the total available times and the corrected used times.
In one embodiment, determining a life impact factor for a relay includes: determining a corresponding current influence coefficient according to the working current of the relay; and/or determining a corresponding resistance influence coefficient according to the working resistance of the relay; using the life influence coefficient to correct the used times, comprising: the number of used times is corrected by using the current influence coefficient and/or the resistance influence coefficient.
In one embodiment, determining the corresponding current influence coefficient according to the working current of the relay includes: when the working current of the relay is less than or equal to the set reference current, determining that the corresponding current influence coefficient is 1; or when the working current of the relay is larger than the reference current, determining the corresponding current influence coefficient according to the current ratio of the working current and the reference current.
In one embodiment, determining the corresponding current influence coefficient according to the current ratio of the operating current and the reference current includes: determining the current influence coefficient by adopting the following formula:
wherein m is the current influence systemNumber, I is the operating current, I 0 Is a reference current.
In one embodiment, the relay is used for a protection switch of a battery, and the reference current is determined based on twice the capacity of the battery.
In one embodiment, determining the corresponding resistance influence coefficient according to the working resistance of the relay includes: determining the working temperature of the relay; determining the working resistance of the relay according to the working temperature and the corresponding relation between the working temperature and the working resistance which is established in advance; and determining the corresponding resistance influence coefficient according to the resistance ratio of the working resistance and the initial resistance of the relay.
In one embodiment, determining the corresponding resistance influence coefficient according to the resistance ratio of the working resistance and the initial resistance of the relay includes: determining the resistance coefficient of influence using the following equation:
wherein n is the coefficient of influence of resistance, R is the working resistance, R 0 Is the initial resistance.
In one embodiment, predicting the life of the relay based on the total number of available times and the corrected number of used times comprises: determining the residual available times of the relay according to the total available times and the corrected used times; and determining a health state parameter of the relay according to the remaining available times and the total available times, wherein the health state parameter is used for representing the service life of the relay.
Another technical scheme adopted by the application is as follows: there is provided an electronic device comprising a processor and a memory, the memory having stored therein program data, the processor being configured to execute the program data to implement the method as described above.
Another technical scheme adopted by the application is as follows: there is provided a computer readable storage medium having stored therein program data for performing the method as described above when executed by a processor.
The method for predicting the service life of the relay comprises the following steps: acquiring the total available times and the used times of a relay to be predicted; determining a life influence coefficient of the relay, wherein the life influence coefficient is determined by the working condition of the relay; correcting the used times by utilizing the life influence coefficient; and predicting the service life of the relay according to the total available times and the corrected used times. By the method, the used times of the relay and the working condition of the relay in the using process are considered in the service life prediction, and the used times are corrected by using the using condition, so that the predicted service life of the relay is more accurate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. Wherein:
fig. 1 is a schematic flowchart of an embodiment of a method for predicting a life of a relay according to the present disclosure;
FIG. 2 is a schematic flow chart of one embodiment of step 12 of FIG. 1;
FIG. 3 is a schematic flow chart of another embodiment of step 12 in FIG. 1;
FIG. 4 is a schematic flow chart of one embodiment of step 14 of FIG. 1;
FIG. 5 is a schematic structural diagram of an embodiment of an electronic device provided in the present application;
FIG. 6 is a schematic structural diagram of an embodiment of a computer-readable storage medium provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not limited to those listed but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic flowchart of an embodiment of a method for predicting a life of a relay, the method including:
step 11: and acquiring the total available times and the used times of the relay to be predicted.
The total available times of the relays are generally determined based on the types and the qualities of the relays, the total available times are generally inherent parameters of the relays leaving factories, the total available times of most relays can reach 10 ten thousand times, some relays can even reach 100 ten thousand times, and for example, the service life of the relay with the model number of JRX-13F is 100 ten thousand times.
The used times of the relay refers to the switching times of the relay in the using process after leaving the factory, and generally 1 time is counted by one-time switching.
In an alternative embodiment, the number of used relays can be accumulated by recording the working state of the relays, the initial parameter can be set to 0, and the value is accumulated from 0 every time the relays are switched once when the relays are operated. Specifically, the switch of the relay can be detected through current detection, optical coupling detection, magnetic force detection and other modes.
It can be understood that, in the two parameters obtained in step 11, the total available times is an inherent parameter, the used times is a parameter obtained in the using process of the relay, and the obtaining timings of the two parameters do not affect the subsequent steps, so that step 11 may not be used as the first step of this embodiment, and the corresponding parameters need to be used in the subsequent steps.
Step 12: and determining a life influence coefficient of the relay, wherein the life influence coefficient is determined by the working condition of the relay.
The relay has a plurality of factors affecting the service life, and the working conditions of the relay may include working voltage, working current, working resistance, working temperature, overload times, failure (fault) times, and the like.
In this embodiment, the influence of the working temperature, the working current, and the working resistance on the service life of the relay may be considered. Wherein the working resistance is influenced by the working temperature.
Step 13: and correcting the used times by utilizing the life influence coefficient.
In one embodiment, step 12 may comprise: determining a corresponding current influence coefficient according to the working current of the relay; and/or determining a corresponding resistance influence coefficient according to the working resistance of the relay; step 13 may specifically be: and correcting the used times by using the current influence coefficient and the resistance influence coefficient.
The influence of the working current on the service life of the relay is introduced firstly:
wherein the operating current of the relay may be determined by sampling the current flowing through the relay. Alternatively, a sampling resistor may be provided at the input or output of the relay, and the operating current flowing through the relay may be determined by detecting the voltage difference across the sampling resistor.
Referring now to fig. 2, fig. 2 is a schematic flow chart of an embodiment of step 12 in fig. 1, where step 12 may include:
step 12a1: and judging whether the working current of the relay is less than or equal to the set reference current.
If the determination result of step 12a1 is yes, step 12a2 is executed, and if the determination result of step 12a1 is no, step 12a3 is executed.
The reference current may be set empirically, and may be generally set as a threshold current that affects the lifetime of the relay, in other words, the lifetime of the relay may be degraded normally when the working current is less than or equal to the reference current, and the lifetime of the relay may be degraded more when the working current is greater than the reference current.
For example, the number of times the relay can be used is taken as its life, when the working current is less than or equal to the reference current, the number of times the relay can be used can be considered to be reduced by 1 time per switch, and when the working current is greater than the reference current, the number of times the relay can be used can be considered to be reduced by more than 1 time, such as 2 times per switch, and the increase of the specific number of times can be determined according to the magnitude of the current.
Therefore, the current influence coefficient is adopted by the embodiment to correct the reduction of the available times, so that the life is estimated.
In an alternative embodiment, the reference current may be set to be larger than the current of the relay during normal operation, for example, may be set to be twice the normal current.
In another alternative embodiment, the relay is applied in a protection switch of a battery, the reference current can be set to be twice the value of the capacity of the corresponding battery, for example, the capacity of the battery is 5000mA · H, and then the reference current can be set to be 5000mA × 2=1a.
Step 12a2: the corresponding current influence coefficient was determined to be 1.
It is understood that when the operating current is less than or equal to the reference current, it is considered that the magnitude of the current has little influence on the life of the relay, and therefore, the corresponding current influence coefficient is determined to be 1.
Step 12a3: and determining a corresponding current influence coefficient according to the current ratio of the working current to the reference current.
It is understood that when the operating current is less than or equal to the reference current, it is considered that the current exceeds the normal level, which may increase the aging of the relay and shorten the life of the relay.
In step 12a3, since the working current is greater than the reference current, the current ratio of the working current to the reference current is greater than 1, and the number of used times is corrected by a coefficient greater than 1, which can increase the number of used times, thereby shortening the predicted life of the relay.
Specifically, the current influence coefficient m is determined using the following formula:
wherein m is the current influence coefficient, I is the working current, I 0 Is a reference current.
The influence of the working resistance on the service life of the relay is introduced:
it can be understood that the resistance of the relay is affected by temperature, and in a high-temperature environment, the corrosion rate of metal parts is accelerated, and the performance of the relay is reduced or even fails. In addition, with the use of the relay, the contact surface of the metal contact (such as the copper pillar and the copper sheet) of the relay is not smooth, and the resistance is increased, which also affects the service life of the relay.
Since the temperature of the relay may affect the resistance of the relay, in this embodiment, by considering the effect of the resistance on the life of the relay, the effect of the temperature and the resistance on the life of the relay may be reflected.
Referring now to fig. 3, fig. 3 is a schematic flow chart of another embodiment of step 12 in fig. 1, where step 12 may include:
step 12b1: the operating resistance of the relay is determined.
In one embodiment, the detection may be performed by a specific instrument, such as a voltmeter and an ammeter, and the resistance of the relay is calculated by detecting the voltage across the relay and the current flowing through the relay, or the measurement may be performed by other resistance measuring instruments.
In another embodiment, the operating resistance of the relay may be determined by temperature sensing of the relay.
Specifically, determining the working temperature of the relay; and determining the working resistance of the relay according to the working temperature and the pre-established corresponding relation between the working temperature and the working resistance.
In the testing stage, the relay is enabled to work at different temperatures, the resistance change conditions of the relay at the temperatures are respectively measured, for example, the corresponding resistances of the relay at the temperatures of 5 ℃, 10 ℃, 15 ℃, 8230, 60 ℃ and the like can be respectively measured, then in the predicting stage, the temperature of the relay is directly detected through a temperature sensor, and the working resistance of the relay is determined through the corresponding relation between the working temperature and the working resistance.
It will be appreciated that the range and granularity of the temperature may be determined based on the type of relay and the accuracy of the prediction.
The following table shows a corresponding table of temperature and resistance for a set of relays:
| temperature (. Degree. C.) | Resistance R |
| 0 | R 0 |
| 25 | R 0 |
| 35 | 1.2R 0 |
| 45 | 1.5R 0 |
| 55 | 2R 0 |
With reference to the above table, wherein R 0 For the initial resistance of the relay, in a specific implementation, the resistance of the relay can be determined by temperature detection and table lookup.
Step 12b2: and determining the corresponding resistance influence coefficient according to the resistance ratio of the working resistance and the initial resistance of the relay.
Unlike the above-described manner of influence of the current, the resistance of the relay cannot be reduced in general, so in the present embodiment, only the case where the resistance of the relay is increased is considered.
Since the working resistance is larger than the initial resistance, the resistance ratio of the working resistance to the initial resistance is larger than 1, and the number of used times is corrected by adopting a coefficient larger than 1, so that the number of used times can be increased, and the predicted service life of the relay is shortened.
Specifically, the resistance influence coefficient n is determined using the following formula:
wherein n is the coefficient of resistance influence, R is the working resistance, R 0 Is the initial resistance.
Step 14: and predicting the service life of the relay according to the total available times and the corrected used times.
Optionally, as shown in fig. 4, fig. 4 is a schematic flowchart of an embodiment of step 14 in fig. 1, and step 14 may include:
step 141: and determining the residual available times of the relay according to the total available times and the corrected used times.
Step 142: and determining the health state parameter of the relay according to the remaining available times and the total available times.
The above steps 141 and 142 may determine the health status parameter of the relay by using the following formula:
wherein SOH is a health state reference, m is a current influence coefficient, and n is a resistance influence coefficient.
Alternatively, in other embodiments, the influence coefficient on the number of used times may only select one of the current influence coefficient m or the resistance influence coefficient, i.e. the above formula may become:
It is understood that the SOH of the relay is 100% at the time of shipment.
The method for predicting the service life of the relay provided by the embodiment of the application comprises the following steps: acquiring the total available times and the used times of a relay to be predicted; determining a life influence coefficient of the relay, wherein the life influence coefficient is determined by the working condition of the relay; correcting the used times by utilizing the life influence coefficient; and predicting the service life of the relay according to the total available times and the corrected used times. By the method, the used times of the relay and the working condition of the relay in the using process are considered in the service life prediction, and the used times are corrected by using the using condition, so that the predicted service life of the relay is more accurate.
Furthermore, the working current and the working resistance of the relay can be considered in the working condition, and the influence of the current, the resistance and the temperature on the relay is considered when the service life of the relay is predicted because the working resistance is influenced by the temperature, so that the service life prediction precision is improved.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of an electronic device provided in the present application, where the electronic device 500 includes a processor 510 and a memory 520, where the memory 520 stores program data, and the processor 510 is configured to execute the program data to implement:
acquiring the total available times and the used times of a relay to be predicted; determining a life influence coefficient of the relay, wherein the life influence coefficient is determined by the working condition of the relay; correcting the used times by utilizing the life influence coefficient; and predicting the service life of the relay according to the total available times and the corrected used times.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a computer-readable storage medium 600 provided in the present application, in which program data 610 is stored, and when the program data is executed by a processor, the program data is used to implement:
acquiring the total available times and the used times of a relay to be predicted; determining a life influence coefficient of the relay, wherein the life influence coefficient is determined by the working condition of the relay; correcting the used times by utilizing the life influence coefficient; and predicting the service life of the relay according to the total available times and the corrected used times.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another coefficient, or some features may be omitted, or not executed.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made according to the content of the present specification and the accompanying drawings, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A method of predicting relay life, the method comprising:
acquiring the total available times and the used times of a relay to be predicted; and
determining a life influence coefficient of the relay, wherein the life influence coefficient is determined by the working condition of the relay;
correcting the used times by utilizing the service life influence coefficient;
and predicting the service life of the relay according to the total available times and the corrected used times.
2. The method of claim 1,
the determining the life influence coefficient of the relay comprises the following steps:
determining a corresponding current influence coefficient according to the working current of the relay; and/or
Determining a corresponding resistance influence coefficient according to the working resistance of the relay;
the utilizing the life influence coefficient to correct the used times comprises the following steps:
and correcting the used times by utilizing the current influence coefficient and/or the resistance influence coefficient.
3. The method of claim 2,
the determining the corresponding current influence coefficient according to the working current of the relay comprises the following steps:
when the working current of the relay is less than or equal to the set reference current, determining that the corresponding current influence coefficient is 1; or
And when the working current of the relay is greater than the reference current, determining a corresponding current influence coefficient according to the current ratio of the working current to the reference current.
4. The method of claim 3,
determining a corresponding current influence coefficient according to a current ratio of the working current to the reference current, including:
determining the current influence coefficient using the following equation:
wherein m is the current influence coefficient, I is the working current, I 0 Is the reference current.
5. The method of claim 3,
the relay is used for a protection switch of a battery, and the reference current is determined based on twice the capacity of the battery.
6. The method of claim 2,
the determining the corresponding resistance influence coefficient according to the working resistance of the relay comprises the following steps:
determining the working temperature of the relay;
determining the working resistance of the relay according to the working temperature and the corresponding relation between the working temperature and the working resistance which is established in advance;
and determining a corresponding resistance influence coefficient according to the resistance ratio of the working resistance and the initial resistance of the relay.
7. The method of claim 6,
the determining the corresponding resistance influence coefficient according to the resistance ratio of the working resistance and the initial resistance of the relay comprises the following steps:
determining the resistance coefficient of influence using the formula:
wherein n is the resistance influence coefficient, R is the working resistance, R 0 Is the initial resistance.
8. The method according to any one of claims 1 to 7,
the predicting the service life of the relay according to the total available times and the corrected used times comprises the following steps:
determining the residual available times of the relay according to the total available times and the corrected used times;
and determining a state of health parameter of the relay according to the remaining available times and the total available times, wherein the state of health parameter is used for representing the service life of the relay.
9. An electronic device, characterized in that the electronic device comprises a processor and a memory, the memory having stored therein program data, the processor being adapted to execute the program data to implement the method according to any of claims 1-8.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein program data for, when executed by a processor, performing the method of any one of claims 1-8.
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| CN116512914A (en) * | 2023-07-05 | 2023-08-01 | 岚图汽车科技有限公司 | Control method and control device for relay for power battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116512914A (en) * | 2023-07-05 | 2023-08-01 | 岚图汽车科技有限公司 | Control method and control device for relay for power battery |
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