CN115320443B - Charging pile control method for new energy automobile - Google Patents

Charging pile control method for new energy automobile Download PDF

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Publication number
CN115320443B
CN115320443B CN202211249778.7A CN202211249778A CN115320443B CN 115320443 B CN115320443 B CN 115320443B CN 202211249778 A CN202211249778 A CN 202211249778A CN 115320443 B CN115320443 B CN 115320443B
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charging
acquiring
pile
current
resistance
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CN115320443A (en
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苏建华
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Nantong Wiices New Energy Technology Co ltd
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Nantong Wiices New Energy Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/35—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to the technical field of new energy automobile charging, in particular to a charging pile control method for a new energy automobile, which comprises the following steps: acquiring resistance and offset pressure of a charging plug in a power receiving structure during each pile pair charging in real time, and acquiring a sound spectrum when the charging plug is occluded during each pile pair charging and the number of times of unstable current in each charging process; acquiring reference frequency spectrums of the sound frequency spectrums, acquiring the similarity degree between each sound frequency spectrum and the reference frequency spectrums, and acquiring a pile-pair stability index according to the resistance and the similarity degree when the pile is charged for each time; obtaining a correction index based on the offset pressure and the pile stability index; and acquiring the aging degree of the charging plug according to the unstable current times and the correction index when the pile is subjected to repeated charging. According to the invention, the aging detection of the charging plug can be carried out, the old charging plug can be checked in time, the charging early warning is carried out, the charging control is realized when the new energy automobile is charged, and the charging safety is ensured.

Description

Charging pile control method for new energy automobile
Technical Field
The invention relates to the technical field of new energy automobile charging, in particular to a charging pile control method for a new energy automobile.
Background
Along with the development of science and technology and awakening of people on the environmental protection concept, the quantity of new energy automobiles is increased at a very high speed, but chargeable parking spaces are limited and can be occupied by fuel vehicles, so that the new energy automobiles cannot enter the parking spaces to be charged, therefore, the charger robot starts to operate, the charger robot can automatically charge the automobiles similarly to a mobile charger, the charger robot can identify charging slots to charge according to technologies such as images and the like in the charging process, large-current contacts for charging and small-current contacts for information confirmation are arranged in the slots, and after the protocol confirmation of the small-current contacts is carried out, the charger robot can start to input current to the automobiles and start to charge.
Because image identification can not accomplish hundred per cent accurately necessarily, so the slot can take place minimum skew to a stake in-process, causes charging plug's wearing and tearing ageing, leads to charging connection not good, appears the potential safety hazard of charging to and the not good experience of charging.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a charging pile control method for a new energy automobile, which adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a charging pile control method for a new energy vehicle, including the following steps:
acquiring resistance and offset pressure of a charging plug in a power receiving structure during each charging pile pair in real time, and acquiring a sound spectrum when the charging plug is occluded during each charging pile pair and the number of times of unstable current in each charging process;
acquiring reference frequency spectrums of the sound frequency spectrums, acquiring the similarity degree between each sound frequency spectrum and the reference frequency spectrums, and acquiring a pile-pair stability index according to the resistance of each charging pile pair and the similarity degree; obtaining a correction index based on the offset pressure and the pair of pile stability indices;
and acquiring the aging degree of the charging plug according to the unstable current times when the pile is subjected to repeated charging and the correction index, and performing charging control according to the aging degree.
Preferably, the method for acquiring the number of times of current instability includes:
when the charging current is smaller than the current threshold, the current is unstable, and the times of unstable current in the charging process are recorded; the current threshold is obtained from a normal charging current.
Preferably, the method for acquiring the reference spectrum comprises:
and acquiring a sound spectrum corresponding to a preset charging frequency from the initial charging of the power receiving structure as an initial spectrum, and fitting all the initial spectrums into one reference spectrum.
Preferably, the method for obtaining the pile stability index includes:
and acquiring the average resistance and the resistance fluctuation exponent of all resistance acquired in real time in each charging process, calculating the product of the average resistance and the similarity degree, and taking the ratio of the product to the resistance fluctuation exponent as the pile stability exponent.
Preferably, the method for obtaining the correction index includes:
and acquiring the average offset pressure of all offset pressures acquired in real time in each charging process, and taking the ratio of the average offset pressure to the pile stability index as the correction index.
Preferably, the method for acquiring the aging degree comprises the following steps:
acquiring an average value of the number of times of current instability of each charging process and a plurality of previous charging processes, calculating the number difference between the number of times of current instability of the charging process and the average value, and acquiring the aging degree according to the number difference of the charging processes and corresponding correction indexes; the time difference and the correction index are in positive correlation with the aging degree.
The embodiment of the invention at least has the following beneficial effects:
acquiring resistance and offset pressure of a charging plug in a power receiving structure during each pile pair charging in real time, and acquiring a sound spectrum when the charging plug is occluded during each pile pair charging and the number of times of unstable current in each charging process; the aging degree of the charging plug is obtained based on data acquired during pile pairing through multiple charging, the stability degree of current in the charging process and the sound frequency spectrum of the charging plug during meshing can reflect whether the charging process is safe or not and whether charging is stable or not, and the aging degree of the charging plug is represented by combining the stability degree of the charging plug and the stability degree of the charging plug, so that the obtained result is more reliable; the charging plug with high aging degree is replaced and charging early warning is carried out, aging detection can be carried out on the charging plug, old charging plugs can be checked in time, charging early warning is carried out, charging control is achieved when the new energy automobile is charged, and charging safety is guaranteed.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart illustrating steps of a charging pile control method for a new energy vehicle according to an embodiment of the present invention.
Detailed Description
In order to further explain the technical means and effects of the present invention adopted to achieve the predetermined purpose, the following detailed description, the structure, the features and the effects of the charging pile for the new energy vehicle according to the present invention are provided with reference to the accompanying drawings and the preferred embodiments. In the following description, the different references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention is oriented to new energy taxies or other new energy operation motorcades with unified models, and in order to avoid occupying excessive parking resources, the charging control of the new energy automobile is carried out aiming at the process of the charging robot on the pile. The specific scheme of the charging pile control method for the new energy automobile is specifically described below with reference to the accompanying drawings.
Referring to fig. 1, a flowchart illustrating steps of a charging pile control method for a new energy vehicle according to an embodiment of the present invention is shown, where the method includes the following steps:
and S001, acquiring resistance and offset pressure of a charging plug in the power receiving structure during each charging pile pair in real time, and acquiring a sound frequency spectrum when the charging plug is occluded during each charging pile pair and the frequency of unstable current in each charging process.
In the embodiment of the invention, the power receiving structure is an automatic charging mechanical arm, and the charger robot inserts the charging plug into the charging slot of the new energy automobile through the mechanical arm so as to charge the new energy automobile.
The method comprises the following specific steps:
1. the resistance and the offset pressure of a charging plug in the power receiving structure during each charging on the pile are collected in real time.
Because the charging plug and the slot are in tight contact, the charging plug can be subjected to resistance in the process of being inserted into the slot, meanwhile, the side face of the plug can also be subjected to friction, and if the charging plug is not completely aligned, extremely small offset can be generated, so that offset pressure is caused on the charging plug. Resistance and offset pressure are acquired in real time by additionally arranging a pressure sensor on the charging plug. Specifically, a patch type pressure sensor is arranged at the front end of a charging plug to collect resistance in real time; and mounting patch type pressure sensors in three directions outside the charging plug respectively to acquire the offset pressure in the direction, and selecting the maximum value of the three values in real time as the offset pressure applied to the charging plug.
Each time of charging the pile, a resistance sequence consisting of real-time resistance and an offset pressure sequence consisting of real-time offset pressure are obtained, the acquisition frequency of the pressure sensor is 10Hz, and each time of charging, a resistance sequence with the length of N is obtained
Figure DEST_PATH_IMAGE001
And an offset pressure sequence
Figure 93771DEST_PATH_IMAGE002
。
2. And acquiring a sound spectrum when the charging plug is occluded during each charging pair of piles.
When the charging slot is occluded, sound with certain frequency can be emitted, and when the pile is aged, the sound frequency can be changed, so that the pile is originally crisp and becomes slightly stuffy after being aged.
The occlusion sound when charging the counter pile is measured by a microphone mounted at the top end of the plug, the sampling rate of the microphone is 24000HZ, and a frequency spectrum of the sound is obtained every time charging is carried out.
3. And acquiring the unstable current times in each charging process.
The charging robot can identify a charging slot according to technologies such as images in the charging process, a charging plug is inserted into the charging slot through a mechanical arm for charging, a large-current contact for charging and a small-current contact for information confirmation are arranged in the charging slot, and after the protocol confirmation of the small-current contact, the charging robot can start inputting current into an automobile and start charging.
When the charging plug ages to a certain degree, contact failure may occur due to loose occlusion in the charging process, when the contact failure occurs, the system is automatically powered off for safety, and when the induction lead for protocol confirmation detects information, the charging is continued.
When the charging current is smaller than the current threshold value, the current is unstable, and the unstable times of the current in the charging process are recorded; the current threshold is obtained from the normal charging current.
For a new energy automobile of the same automobile type, charging plugs in different aging degrees are charged, the charging current is different, the use intensity of the automobile before charging is different, temperature protection can be triggered, the charging current is different, accordingly, the current during corresponding normal charging is obtained, 90% of the normal current is used as a current threshold, when the charging current is smaller than the current threshold, the current is unstable, and the number Y of times of unstable current in each charging process is recorded.
Step S002, acquiring reference frequency spectrums of the sound frequency spectrums, acquiring the similarity degree between each sound frequency spectrum and each reference frequency spectrum, and acquiring a pile-pair stability index according to the resistance and the similarity degree when the pile is charged for each time; a correction index is obtained based on the offset pressure and the pile stability index.
The method comprises the following specific steps:
1. a reference spectrum of a sound spectrum is acquired.
The method comprises the steps of obtaining a sound spectrum corresponding to a preset charging frequency from the initial charging of a power receiving structure as an initial spectrum, and fitting all the initial spectrums into a reference spectrum.
Since the degree of deterioration at the time of initial charging is minimal, the initial sound spectrum is used as a reference. In the embodiment of the invention, the preset charging times are 10 times, the sound frequency spectrum corresponding to the 10 times of charging before the initial charging is collected as the initial frequency spectrum, and all the initial frequency spectrums are fitted into one reference frequency spectrum
Figure DEST_PATH_IMAGE003
。
In another embodiment, the sound spectrum at the time of initial charging is employed as the reference spectrum.
2. And acquiring a pile alignment stability index when the pile alignment is charged each time.
And acquiring the average resistance and the resistance fluctuation exponent of all resistance acquired in real time in each charging process, calculating the product of the average resistance and the similarity degree, and taking the ratio of the product to the resistance fluctuation exponent as the pile stability exponent.
Firstly, calculating cosine similarity between each sound frequency spectrum and a reference frequency spectrum
Figure 937968DEST_PATH_IMAGE004
As the degree of similarity, since the data is taken as the reference value in the last 10 charges, the data obtained in the last 10 charges does not participate in the subsequent calculation, i.e.
Figure DEST_PATH_IMAGE005
。
Obtaining the average resistance of all the resistances collected in real time in each charging process
Figure 12234DEST_PATH_IMAGE006
And resistance fluctuation exponent
Figure DEST_PATH_IMAGE007
And calculating the variance of the resistance to be used as a resistance fluctuation exponent.
In another embodiment, the standard deviation of the resistance is used as the resistance fluctuation index, and in other embodiments, other parameters representing the distribution difference can be used as the resistance fluctuation index.
Then calculating the pile stability index:
Figure DEST_PATH_IMAGE009
wherein the content of the first and second substances,
Figure 326453DEST_PATH_IMAGE010
represents the pile stability index of the ith charging process,
Figure DEST_PATH_IMAGE011
represents the average resistance of the ith charging process,
Figure 664024DEST_PATH_IMAGE004
indicating the degree of similarity between the ith sound spectrum and the reference spectrum,
Figure 356037DEST_PATH_IMAGE012
indicating the index of the resistive fluctuation of the ith charging process.
For the ith charging process, when the average value of the resistance is larger and the variance is smaller, the situation that the damping sense is strong and the damping is uniform when the charging plug is inserted into the slot is shown, the situation that the charging plug is stably inserted into the slot is shown, and the situation that the pile is charged at this time is more normal, and the pile stability index is larger; when the similarity degree between the infrasound frequency spectrum and the reference frequency spectrum is larger, the closer the occlusion process in the charging is to the occlusion sound in the initial insertion of the slot, and the more normal the pile aligning condition in the charging is, the larger the pile aligning stability index is.
3. And acquiring a correction index in each charging process.
And acquiring the average offset pressure of all offset pressures acquired in real time in each charging process, and taking the ratio of the average offset pressure to the pile stability index as a correction index.
The charging is confirmed to be unfavorable to the stake because the skew pressure condition that receives of plug deviation and to stake stability index are charged at every turn because the skew that leads to the stake is inaccurate or because the plug damping that leads to of plug wearing and tearing is ageing to be reduced, has reduced the even degree of atress among the insertion process, if inaccurate to the stake, can be because the skew pressure influences the atress evenly, need revise and make accurate to the stake.
Calculating a correction index in each charging process:
Figure 794846DEST_PATH_IMAGE014
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE015
indicates a correction index for the ith charging process,
Figure 521494DEST_PATH_IMAGE016
representing the average offset pressure for the ith charging process.
Mean offset pressure
Figure 889021DEST_PATH_IMAGE016
The larger the deviation is, the larger the deviation pressure of the contact between the section of the plug and the side surface of the slot caused by the deviation is, the more inaccurate the plug is in pile alignment, the larger the correction index is, the more correction is needed; pile stability index
Figure 333909DEST_PATH_IMAGE010
The smaller, the less accurate the pile, the larger the correction index.
And S003, acquiring the aging degree of the charging plug according to the unstable current times and the correction index during pile pair charging for multiple times, and performing charging control according to the aging degree.
The method comprises the following specific steps:
1. and acquiring the aging degree of the charging plug.
Acquiring an average value of the unstable current times of each charging process and a plurality of previous charging processes, calculating the difference between the unstable current times of the charging process and the average value, and acquiring the aging degree according to the difference of the times of the plurality of charging processes and corresponding correction indexes; the time difference and the correction index are in positive correlation with the aging degree.
And obtaining the average value of the unstable times of the current in each charging process and the previous 10 charging processes, wherein the difference between the unstable times of the current in the charging process and the average value in the previous 10 charging processes reflects whether the unstable times of the current in the charging process are normal or not, and if the unstable times are not normal, the unstable times of the current in the charging process are screened out in comparison with the previous 10 charging processes.
Calculating the difference of the number of ith charging processes
Figure DEST_PATH_IMAGE017
：
Figure DEST_PATH_IMAGE019
Wherein the content of the first and second substances,
Figure 389459DEST_PATH_IMAGE020
indicating the number of times the current is unstable during the ith charging,
Figure DEST_PATH_IMAGE021
it is shown that the average value is calculated,
Figure 236192DEST_PATH_IMAGE022
the average value of the number of current instability times of 10 charging processes before the ith charging process is shown.
Then, the degree of charge abnormality is calculated:
Figure 7577DEST_PATH_IMAGE024
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE025
indicating the degree of charge abnormality in the ith charging process.
When the current instability times are more than 10 times of charging in the past, the difference of times is obtained
Figure 877444DEST_PATH_IMAGE017
The larger the current is, the more abnormal the instability times of the current are, the larger the abnormal degree of charging is, and the more serious the aging of the charging plug is; if the correction index is
Figure 97203DEST_PATH_IMAGE015
The larger the charging is, the larger the plug is corrected, the larger the charging abnormality is, and the more the charging plug is deteriorated.
The use number of times of charging plug is more frequent, and the plug that charges at every turn all can have certain wearing and tearing to the plug of robot, and the plug of robot can't laminate with slot hundredth percent in a long time, has some not hard up, when not hard up degree too big leads to unable normal journey to charge, this charging plug need be changed.
Further, since plug instability is not only related to the plug but also related to the slot, and one charging robot needs to serve a plurality of new energy vehicles, the charging abnormal degree in 10 consecutive charging processes is obtained, and the average value of the charging abnormal degrees is obtained as the aging degree of the charging plug, that is, the aging degree of the charging plug is obtained
Figure 291119DEST_PATH_IMAGE026
。
If the plug charging abnormal degree is misjudged when the occlusion is not close and the contact is not good due to the fact that the slots on the vehicle are in a problem, the probability that all plugs of the vehicles served by the robot are in fault in the adjacent 10 times of charging is extremely low, therefore, the average value of the charging abnormal degrees in the adjacent 10 times of charging processes is calculated to represent the aging degree of the robot, errors can be eliminated, and the obtained result is more accurate.
2. And managing the charging plug according to the aging degree, and performing charging control.
Set up ageing threshold value, when ageing degree is greater than ageing threshold value, need change charging plug, send the early warning when discerning the action of charging simultaneously, realize charging control, avoid old plug to continue to charge, cause the accident.
As an example, the aging threshold value in the embodiment of the present invention is 0.9.
In summary, the embodiment of the present invention collects the resistance and offset pressure applied to the charging plug in the power receiving structure during each pile pair charging in real time, and obtains the sound spectrum when the charging plug is engaged during each pile pair charging, and the number of times of current instability during each charging process; acquiring reference frequency spectrums of the sound frequency spectrums, acquiring the similarity degree between each sound frequency spectrum and the reference frequency spectrums, and acquiring a pile-pair stability index according to the resistance and the similarity degree when the pile is charged for each time; obtaining a correction index based on the offset pressure and the pile stability index; and acquiring the aging degree of the charging plug according to the unstable current times and the correction index during pile charging for multiple times, and performing charging control according to the aging degree. According to the embodiment of the invention, old charging plugs can be checked in time, charging early warning is carried out, charging control is realized, and charging safety is ensured.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; modifications of the technical solutions described in the foregoing embodiments, or equivalents of some technical features thereof, are not essential to the spirit of the technical solutions of the embodiments of the present application, and are all included in the scope of the present application.

Claims (3)

1. A charging pile control method for a new energy automobile is characterized by comprising the following steps:
acquiring resistance and offset pressure of a charging plug in a power receiving structure during each charging pile pair in real time, and acquiring a sound spectrum when the charging plug is occluded during each charging pile pair and the number of times of unstable current in each charging process;
acquiring a reference frequency spectrum of the sound frequency spectrum, acquiring the similarity degree between each sound frequency spectrum and the reference frequency spectrum, and acquiring a pile stability index according to the resistance of each charging pile and the similarity degree; obtaining a correction index based on the offset pressure and the pair pile stability index;
acquiring the aging degree of the charging plug according to the unstable current times and the correction index during pile charging for multiple times, and performing charging control according to the aging degree;
the method for acquiring the pile stability index comprises the following steps:
acquiring the average resistance and resistance fluctuation exponent of all resistance acquired in real time in each charging process, calculating the product of the average resistance and the similarity degree, and taking the ratio of the product to the resistance fluctuation exponent as the pile stability exponent;
the method for acquiring the correction index comprises the following steps:
acquiring the average offset pressure of all offset pressures acquired in real time in each charging process, and taking the ratio of the average offset pressure to the pile stability index as the correction index;
the method for acquiring the aging degree comprises the following steps:
acquiring an average value of the number of times of current instability of each charging process and a plurality of previous charging processes, calculating the number difference between the number of times of current instability of the charging process and the average value, and acquiring the aging degree according to the number difference of the charging processes and corresponding correction indexes; the time difference and the correction index are in positive correlation with the aging degree.
2. The charging pile control method for the new energy automobile according to claim 1, wherein the method for acquiring the number of instable current is as follows:
when the charging current is smaller than the current threshold value, the current is unstable, and the unstable times of the current in the charging process are recorded; the current threshold is obtained from a normal charging current.
3. The charging pile control method for the new energy automobile according to claim 1, wherein the reference frequency spectrum is obtained by the method comprising the following steps:
and acquiring a sound spectrum corresponding to the preset charging times from the initial charging of the power receiving structure as an initial spectrum, and fitting all the initial spectrums into one reference spectrum.
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