CN106226670A - The insulation detecting circuit of electric automobile and method - Google Patents
The insulation detecting circuit of electric automobile and method Download PDFInfo
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- CN106226670A CN106226670A CN201610802603.2A CN201610802603A CN106226670A CN 106226670 A CN106226670 A CN 106226670A CN 201610802603 A CN201610802603 A CN 201610802603A CN 106226670 A CN106226670 A CN 106226670A
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- 238000009413 insulation Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 238000012546 transfer Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 39
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- 238000013507 mapping Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 6
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- 238000000465 moulding Methods 0.000 claims 1
- 230000003044 adaptive effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention discloses the insulation detecting circuit of a kind of electric automobile, including battery, and detection module, switch module, multidiameter option switch module, analog-to-digital conversion module and the main control module being connected with battery successively connects, main control module is connected with switch module and multidiameter option switch module the most respectively.When main control module control respectively switch module be in the first and second duties time, detection module will obtain the first total voltage and the first car body voltage respectively to battery detecting under the first duty, and second obtain the second total voltage and the second car body voltage under duty to battery detecting, transmit after carrying out analog digital conversion by multidiameter option switch module transfer to analog-to-digital conversion module respectively to main control module, determine the dielectric strength of electric automobile for main control module.The invention also discloses the insulation detecting method of a kind of electric automobile.Present invention reduces the complexity of hardware circuit, improve reliability and the convenience of the Insulation monitoring to electric automobile.
Description
Technical field
The present invention relates to technical field of automobile detection, particularly relate to insulation detecting circuit and the method for a kind of electric automobile.
Background technology
At present, the Insulation monitoring of electric automobile is broadly divided into electric-resistivity method and signal injection method etc..For signal injection method,
Due to needs Injection Signal, therefore comparatively laborious in terms of software processes, likely normal signal is impacted, reliably simultaneously
Property is relatively low.And for electric-resistivity method, frequently with mode be: whole system select car body for ground, so needing to join positive and negative on hardware
Power supply, the most also needs to do signal reverse process, can be more complicated on hardware, the most convenient.
Summary of the invention
Present invention is primarily targeted at a kind of insulation detecting circuit and the method that electric automobile is provided, it is intended to reduce hardware
The complexity of circuit, improves reliability and the convenience of the Insulation monitoring to electric automobile.
For achieving the above object, the invention provides the insulation detecting circuit of a kind of electric automobile, described electric automobile
Insulation detecting circuit includes battery, detection module, switch module, multidiameter option switch module, analog-to-digital conversion module and master control mould
Block；Described battery successively with described detection module, described switch module, described multidiameter option switch module, described analog digital conversion
Module and described main control module connect, described main control module the most respectively with described switch module and described multidiameter option switch module
Connect；
When switch module described in described master control module controls is in the first duty, described detection module is to described electricity
Pond is detected, and the first total voltage between described anode and the negative pole that will obtain and described battery cathode are to described electronic
First car body voltage of automobile, carries out analog digital conversion by described multidiameter option switch module transfer to described analog-to-digital conversion module
Rear transmission is to described main control module；
When switch module described in described master control module controls is in the second duty, described detection module is to described electricity
Pond is detected, and the second total voltage between described anode and the negative pole that will obtain and described battery cathode are to described electronic
Second car body voltage of automobile, carries out analog digital conversion by described multidiameter option switch module transfer to described analog-to-digital conversion module
After, transmission to described main control module；
Described main control module is according to described first total voltage received, described first car body voltage, described second total electricity
Pressure and described second car body voltage determine the dielectric strength of described electric automobile.
Preferably, the insulation detecting circuit of described electric automobile also includes the first filtration module and the second filtration module, institute
State the first filtration module and described second filtration module is respectively connecting to described switch module and described multidiameter option switch module
Between.
Preferably, described detection module includes the first electric capacity, the second electric capacity, the first resistance and the second resistance；
One end of described first electric capacity negative pole with described second electric capacity and described battery successively is connected, described first electric capacity
The other end be connected with the positive pole of described battery；
One end of described first resistance negative pole with described second resistance and described battery successively is connected, described first resistance
The other end connect be connected with the positive pole of described battery；
Described first electric capacity and described second electric capacity indirectly, described first resistance is with described second resistance indirectly
Ground.
Preferably, described switch module include the first switch, second switch, the 3rd switch, the 4th switch, the 3rd resistance,
4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance；
One end of described first switch successively with described 3rd resistance, described 4th resistance, described 5th resistance, described the
The negative pole of two switches, described 6th resistance and described battery connects, the other end of described first switch and the positive pole of described battery
Connect；Described 4th resistance and described 5th resistance indirectly, be connected between described second switch and described 6th resistance
Described second filtration module；
Described 3rd switch one end successively with described 7th resistance, described 8th resistance, described 4th switch and described
The negative pole of battery connects, and the other end of described 3rd switch is connected with the positive pole of described battery；Described 7th resistance and described the
Eight resistance indirectly；
One end of described 9th resistance negative pole with described tenth resistance and described battery successively is connected, described 9th resistance
The other end be connected with the positive pole of described battery；Described first filtering it is connected between described 9th resistance and described tenth resistance
Module.
Preferably, when described first switch, described second switch and described 3rd switch Guan Bi, and described 4th switch is disconnected
When opening, described switch module is in the first duty；When described first switch, described second switch and described 4th switch close
Closing, and the described 3rd when switching off, described switch module is in the second duty.
Preferably, described main control module is also associated with alarm module.
Additionally, for achieving the above object, present invention also offers the insulation detecting method of a kind of electric automobile, including:
When receiving the first control instruction, obtain the anode of described electric automobile according to described first control instruction
And the first total voltage between negative pole, and the first car body voltage that described battery cathode is to described electric automobile；
When receiving the second control instruction, obtain the anode of described electric automobile according to described second control instruction
And the second total voltage between negative pole, and the second car body voltage that described battery cathode is to described electric automobile；
According to described first total voltage, described first car body voltage, described second total voltage and described second car body voltage,
Obtain the dielectric strength of described electric automobile.
Preferably, described when receiving the first control instruction, obtain described electronic vapour according to described first control instruction
The first total voltage between anode and the negative pole of car, and the first car body electricity that described battery cathode is to described electric automobile
Pressure includes:
When receiving the first control instruction, obtain the negative pole of described battery to described electricity according to described first control instruction
Electrical automobile is at the first magnitude of voltage of current point in time, and obtains after the Preset Time of interval the negative pole of described battery to described electronic vapour
Second magnitude of voltage of car；
Judge that whether the difference between described first magnitude of voltage and described second magnitude of voltage is less than or equal to first set
Voltage threshold；
The most then obtain and specify in the time period average of the voltage between anode and the negative pole of described electric automobile to set
It is set to described first total voltage, and to obtain described battery cathode be described to the mean set of the voltage of described electric automobile
One car body voltage.
Preferably, described when receiving the second control instruction, obtain described electronic vapour according to described second control instruction
The second total voltage between anode and the negative pole of car, and the second car body electricity that described battery cathode is to described electric automobile
Pressure includes:
When receiving the second control instruction, obtain the negative pole of described battery to described electricity according to described second control instruction
Electrical automobile is in the third voltage value of current point in time, and obtains after the Preset Time of interval the negative pole of described battery to described electronic vapour
4th magnitude of voltage of car；
Judge that whether the difference between described third voltage value and described 4th magnitude of voltage is less than or equal to second set
Voltage threshold；
The most then obtain and specify in the time period average of the voltage between anode and the negative pole of described electric automobile to set
It is set to described second total voltage, and to obtain described battery cathode be described to the mean set of the voltage of described electric automobile
Two car body voltages.
Preferably, described according to described first total voltage, described first car body voltage, described second total voltage and described
Two car body voltages, include after obtaining the dielectric strength of described electric automobile:
When the dielectric strength of described electric automobile is less than the intensity threshold set, by the dielectric strength of described electric automobile
Mate with default dielectric strength interval, determine that the dielectric strength at described dielectric strength place is interval；
According to the mapping relations between described dielectric strength interval and dielectric strength grade, by right for described dielectric strength interval
The dielectric strength grade answered is defined as the dielectric strength grade that described electric automobile is current；
According to the mapping relations between described dielectric strength grade and type of alarm, the insulation current to described electric automobile
Strength grade is reported to the police by corresponding type of alarm.
In the insulation detecting circuit of embodiment of the present invention electric automobile, by obtaining first between anode and negative pole
Total voltage and institute's pond negative pole the first car body voltage to electric automobile, and obtain the total electricity of second between anode and negative pole
Pressure and the battery cathode the second car body voltage to electric automobile, determine the dielectric strength of electric automobile.Use whole Battery pack
Negative pole is as reference, it is only necessary to single supply can complete the process of all signals, uses adaptive algorithm on software simultaneously, permissible
Adapt to different car body capacitance requirements.Reducing the complexity of hardware circuit, adaptive ability is strong, improves electric automobile
The reliability of Insulation monitoring and convenience.
Accompanying drawing explanation
Fig. 1 is the integral module schematic diagram of insulation detecting circuit one embodiment of electric automobile of the present invention；
Fig. 2 is the integral module schematic diagram of another embodiment of insulation detecting circuit of electric automobile of the present invention；
Fig. 3 is the structural representation of the insulation detecting circuit of electric automobile of the present invention；
Fig. 4 is the high-level schematic functional block diagram of insulation detecting method one embodiment of electric automobile of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the present invention is carried out clear, complete retouching
State, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Bright embodiment, the every other enforcement that those of ordinary skill in the art are obtained on the premise of not making creative work
Example, broadly falls into protection scope of the present invention.
It is to be appreciated that the description relating to " first ", " second " etc. in the present invention be only used for describe purpose, and it is not intended that
Indicate or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Therefore, define " first ",
The feature of " second " can express or implicitly include at least one this feature.It addition, the technical side between each embodiment
Case can be combined with each other, but must be based on those of ordinary skill in the art are capable of, when the combination of technical scheme
Occur conflicting will be understood that the combination of this technical scheme does not exists, the most not the guarantor of application claims when maybe cannot realize
Within the scope of protecting.
As shown in Figure 1, it is shown that the integral module of insulation detecting circuit one embodiment of a kind of electric automobile of the present invention shows
It is intended to.In Fig. 1, the insulation detecting circuit of electric automobile includes battery 10, detection module 20, switch module 30, multidiameter option switch
Module 60, analog-to-digital conversion module 70 and main control module 80；Wherein, battery 10 successively with detection module 20, switch module 30, multichannel
Select switch module 60, analog-to-digital conversion module 70 and main control module 80 to connect, main control module 80 the most respectively with switch module 30 and
Multidiameter option switch module 60 connects；
When main control module 80 control switch module 30 be in the first duty time, battery 10 is examined by detection module 20
Survey, the first total voltage between battery 10 positive pole and the negative pole that will obtain and battery 10 negative pole the first car body electricity to electric automobile
Pressure, is transmitted by multidiameter option switch module 60 and transmits to main control module 80 after carrying out analog digital conversion to analog-to-digital conversion module 70；
When main control module 80 control switch module 30 be in the second duty time, battery 10 is examined by detection module 20
Survey, the second total voltage between battery 10 positive pole and the negative pole that will obtain and battery 10 negative pole the second car body electricity to electric automobile
Pressure, transmits after carrying out analog digital conversion to analog-to-digital conversion module 70 by multidiameter option switch module 60, and transmission is to main control module 80；
Main control module 80 is according to the first total voltage received, the first car body voltage, the second total voltage and the second car body electricity
Pressure determines the dielectric strength of electric automobile.
Further, as shown in Figure 2, it is shown that another embodiment of insulation detecting circuit of a kind of electric automobile of the present invention
Integral module schematic diagram.In this embodiment, the insulation detecting circuit of electric automobile also includes the first filtration module and the second filtering mould
Block, the first filtration module and the second filtration module are respectively connecting between switch module 30 and multidiameter option switch module 60.
Specifically, the insulation detecting circuit of the electric automobile in Fig. 2 include battery 10, detection module 20, switch module 30,
First filtration module the 40, second filtration module 50, multidiameter option switch module 60, analog-to-digital conversion module 70 and main control module 80；
Wherein, battery 10 is connected with detection module 20 and switch module 30 successively, switch module 30 and multidiameter option switch module 60 it
Between connect the first filtration module 40 and the second filtration module 50 respectively, multidiameter option switch module 60 is with analog-to-digital conversion module 70 even
Connecing, main control module 80 is connected with switch module 30, multidiameter option switch module 60 and analog-to-digital conversion module 70 respectively.
The Insulation monitoring principle of electric automobile will be illustrated below, be in when main control module 80 controls switch module 30
First duty, and control multidiameter option switch module 60 when connecting the first filtration module 40, detection module 20 is to battery 10
Detect, to obtain the first total voltage between battery 10 positive pole B+ and negative pole B-and battery 10 negative pole B-to electric automobile
First car body voltage, and transmit to the first filtration module 40 and be filtered；First filtration module 40 is by filtered first total electricity
Pressure and the first car body voltage are transmitted to analog-to-digital conversion module 70 by multidiameter option switch module 60, and analog-to-digital conversion module 70 is by the
After one total voltage and the first car body voltage are converted to digital signal, transmission is to main control module 80.
It is in the second duty when main control module 80 controls switch module 30, and controls multidiameter option switch module 60 and connect
During logical second filtration module 50, battery 10 is detected by detection module 20, to obtain between battery 10 positive pole B+ and negative pole B-
The second total voltage and the battery 10 negative pole B-the second car body voltage to electric automobile, and transmit to the second filtration module 50 and carry out
Filtering；Filtered second total voltage and the second car body voltage are passed by the second filtration module 50 by multidiameter option switch module 60
Transport to analog-to-digital conversion module 70, after the second total voltage and the second car body voltage are converted to digital signal by analog-to-digital conversion module 70,
Transmission is to main control module 80.
Main control module 80 is at the first total voltage received, the first car body voltage, the second total voltage and the second car body voltage
After, determine that the insulation of electric automobile is strong according to the first total voltage, the first car body voltage, the second total voltage and the second car body voltage
Degree.
The embodiment of the present invention is by obtaining the first total voltage between battery 10 positive pole B+ and negative pole B-and institute pond negative pole B-
The first car body voltage to electric automobile, and obtain the second total voltage between battery 10 positive pole B+ and negative pole B-and battery 10
The negative pole B-the second car body voltage to electric automobile, determines the dielectric strength of electric automobile.Use the negative pole of whole Battery pack 10
As reference, it is only necessary to single supply can complete the process of all signals, uses adaptive algorithm, be adapted on software simultaneously
Different car body capacitance requirements.Reducing the complexity of hardware circuit, adaptive ability is strong, improves the insulation to electric automobile
The reliability of detection and convenience.
Further, as shown in Figure 2, it is shown that the structural representation of the insulation detecting circuit of a kind of electric automobile of the present invention
Figure, in Fig. 2, above-mentioned detection module 20 includes the first electric capacity C1, the second electric capacity C2, the first resistance R1 and the second resistance R2；Wherein,
One end of first electric capacity C1 negative pole B-with the second electric capacity C2 and battery 10 successively is connected, the other end of the first electric capacity C1 and battery
The positive pole B+ of 10 connects；One end of first resistance R1 negative pole B-with the second resistance R2 and battery 10 successively is connected, the first resistance
The other end of R1 connects and is connected with the positive pole B+ of battery 10；First electric capacity C1 and the second electric capacity C2 indirectly, the first resistance R1
With the second resistance R2 indirectly.
Switch module 30 include the first switch K1, second switch K2, the 3rd switch K3, the 4th switch K4, the 3rd resistance R3,
4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the tenth resistance
R10。
Wherein, first switch K1 one end successively with the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, second switch
The negative pole B-of K2, the 6th resistance R6 and battery 10 connects, and the other end of the first switch K1 is connected with the positive pole B+ of battery 10；4th
Resistance R4 and the 5th resistance R5 indirectly, be connected to the second filtration module 50 between second switch K2 and the 6th resistance R6, make
Obtain the second filtration module 50 to be filtered the magnitude of voltage AN3 received processing, to export filtered magnitude of voltage AN4.
One end of 3rd switch K3 successively with the 7th resistance R7, the 8th resistance R8, the 4th switch K4 and the negative pole of battery 10
B-connects, and the other end of the 3rd switch K3 is connected with the positive pole B+ of battery 10；7th resistance R7 and the 8th resistance R8 indirectly；
One end of 9th resistance R9 negative pole B-with the tenth resistance R10 and battery 10 successively is connected, and the 9th resistance R9's is another
One end is connected with the positive pole B+ of battery 10；It is connected to the first filtration module 40 between 9th resistance R9 and the tenth resistance R10 so that
The magnitude of voltage AN1 received can be filtered processing, to export filtered magnitude of voltage AN2 by the first filtration module 40.
When the first switch K1, second switch K2 and the 3rd switch K3 Guan Bi, and when the 4th switch K4 disconnects, switch module 30
It is in the first duty；When the first switch K1, second switch K2 and the 4th switch K4 Guan Bi, and when the 3rd switch K3 disconnects,
Switch module 30 is in the second duty.
The insulation detecting circuit of whole electric automobile selects the negative pole B-of whole Battery pack 10 as reference, avoids negative voltage
Impact, wherein, the first electric capacity C1 and the second electric capacity C2 is car body direct-to-ground capacitance, and the first resistance R1 and the second resistance R2 respectively treats
The anode resistance asked and negative terminal resistance, can corresponding relation between resistance and the dielectric strength of combined standard, according to obtaining
Anode resistance and negative terminal resistance determine the dielectric strength of electric automobile.
Due to car body direct-to-ground capacitance, the i.e. second electric capacity C1 and the existence of the second electric capacity C2, cause the voltage detecting battery by
Change according to exponential law, therefore can judge whether the second electric capacity C1 and the second electric capacity C2 fills by detecting the rate of change of voltage
Full.From normal RC charging curve, electric capacity is during charging, and the rate of change of voltage from large to small, then levels off to 0.
When the rate of change of detection cell voltage is close to 0, it is believed that electric capacity is full of, and completes the self-adapting detecting to electric capacity charging.
Specifically, below the principle of the insulation detecting circuit to electric automobile is described in detail, first by master control mould
Block 80 controls the first switch K1, second switch K2 and the 3rd switch K3 Guan Bi, and controls the 4th switch K4 disconnection.Now, real
Time or interval Preset Time obtain second filtration module 50 output filtering after the battery cathode magnitude of voltage to car body, wherein, U
(N-1) being designated as the magnitude of voltage when previous time point, U (N) is designated as the magnitude of voltage of latter time point, and Uset represents the first electricity of setting
Pressure threshold value.When | U (N)-U (N-1) | is during≤Uset, represent the first electric capacity C1 and the second electric capacity C2 charging complete.Then start
Continuously acquire the first magnitude of voltage AN2 and the second magnitude of voltage AN4 in the appointment time respectively, the first magnitude of voltage AN2 obtained is asked for
The first total voltage UA being set as after meansigma methods between the anode of electric automobile and negative pole, and by the second magnitude of voltage AN4
The battery cathode the first car body voltage U1 to electric automobile it is set as after averaging.Wherein,
U1=[R2//(R5+R6)]/[R1//(R3+R4) //R7+R2//(R5+R6)] * UA formula (1)
Secondly, main control module 80 controls the first switch K1, second switch K2 and the 4th switch K4 Guan Bi, and controls the 3rd
Switch K3 disconnects.Now, in real time or interval Preset Time obtain the filtering of the second filtration module output after battery cathode to car body
Magnitude of voltage, wherein, U'(N-1) be designated as the magnitude of voltage when previous time point, U'(N) be designated as the magnitude of voltage of latter time point, U'
Set represents the second voltage threshold of setting.When | U'(N)-U'(N-1) | during≤U'set, represent the first electric capacity C1 and second electricity
Hold C2 charging complete.Then start to continuously acquire third voltage value and the 4th magnitude of voltage the most respectively, by obtain
The second total voltage UB being set as between the anode of electric automobile and negative pole after third voltage value averaged, and will
4th magnitude of voltage is set as the battery cathode the second car body voltage U2 to electric automobile after averaging.Wherein,
U2=[R2//(R5+R6) //R8]/[R2//(R5+R6) //R8+R1//(R3+R4)] * UB formula (2)
Preferably, calculating and improve the reliability of detection for convenience, the resistance of the 7th resistance R7 is with the 8th resistance R8's
Resistance is equal；The resistance of the 3rd resistance R3 and the resistance sum of the 4th resistance R4, the resistance equal to the 5th resistance R5 and the 6th electricity
The resistance sum of resistance R6.
I.e. set R7=R8, R3+R4=R5+R6 formula (3)
Simultaneous formula (1), formula (2) and formula (3), make UA/UB=K,
Zp'=R7* (U1-U2*K)/(U2*K)
Zn'=R7* (U1-U2*K)/(K*UB-U1)
Therefore, the resistance of available first resistance R1 and the second resistance R2 is:
R1=Zp'* (R3+R4)/(R3+R4-Zp')
R2=Zn'* (R3+R4)/(R3+R4-Zn')
Wherein, the first resistance R1 and the second resistance R2 is respectively anode resistance and the negative terminal resistance of calculated battery,
Resistance according to this anode resistance and negative terminal resistance determines the dielectric strength of electric automobile.
It should be noted that, obtain the first total voltage UA and the step of the first car body voltage U1, and obtain the second total voltage UB
And second the step of car body voltage U2 can mutually exchange, this Preset Time, specify time, the first voltage threshold, the second voltage threshold
The concrete value of value can be arranged as the case may be and flexibly.
The total voltage of battery is divided into the first total voltage UA and the second total voltage UB by the present embodiment, evades to a certain extent
The impact on testing result of the stagnation pressure ripple.It addition, use the negative pole of whole Battery pack 10 as reference, it is only necessary to single supply can complete
The process of all signals, uses adaptive algorithm simultaneously, is adapted to different car body capacitance requirements on software.Not only simplify
The design of the insulation detecting circuit of electric automobile so that circuit structure is simple, and improves the reliability of detection.
Further, above-mentioned main control module 80 is also associated with alarm module.
In the present embodiment, dielectric strength can be divided into different intensity interval, the insulation pre-setting electric automobile is strong
Mapping relations between degree and dielectric strength interval, each dielectric strength is interval for different dielectric strength grades, such as, can
Arrange dielectric strength grade to be incremented by along with weakening of dielectric strength, i.e. dielectric strength the highest grade, dielectric strength the most weak, right
The harm of human body is the biggest.Each dielectric strength grade is correspondingly arranged different type of alarms respectively, and such as, dielectric strength grade is
The type of alarm of one-level is the flicker of LED, dielectric strength grade be the type of alarm of two grades be two LED flickers, absolutely
Edge strength grade is that the type of alarm of three grades is buzzer rings 10 seconds, etc..
After the above-mentioned dielectric strength obtaining electric automobile, first determine whether that whether the dielectric strength of this electric automobile is less than setting
Fixed intensity threshold, if the dielectric strength of electric automobile is more than or equal to the intensity threshold set, then illustrates the electricity of electric automobile
Being pressed in the range of human-body safety, be now made without reporting to the police, the intensity threshold of this setting can set according to actual needs
Put.If the dielectric strength of electric automobile is less than the intensity threshold set, then the overtension of electric automobile is described, may endanger
To human body, now the dielectric strength of electric automobile is mated with the dielectric strength interval preset, determine dielectric strength place
Dielectric strength interval.Then according to the mapping relations between this dielectric strength interval and dielectric strength grade, by dielectric strength
Interval corresponding dielectric strength grade is defined as the dielectric strength grade that electric automobile is current.Further according to dielectric strength grade and report
Mapping relations between police's formula, are reported to the police by corresponding type of alarm to the dielectric strength grade that electric automobile is current,
User is facilitated to take appropriate measures, it is to avoid to cause unnecessary harm.
In the insulation detecting circuit of the present embodiment electric automobile, when the dielectric strength of electric automobile is the strongest less than set
Degree threshold value, can be reported to the police accordingly by master control module controls alarm module, improve safety and the Insulation monitoring of user
Motility.
Accordingly, as it is shown on figure 3, propose the insulation detecting method first embodiment of a kind of electric automobile of the present invention.This is real
The insulation detecting method of the electric automobile executing example includes:
Step S10, when receiving the first control instruction, obtain described electric automobile according to described first control instruction
The first total voltage between anode and negative pole, and the first car body voltage that described battery cathode is to described electric automobile；
In the present embodiment, the insulation detecting method of electric automobile is applied to the insulation detecting circuit of above-mentioned electric automobile,
In Fig. 2, this first control instruction is that main control module 80 controls switch module 30 and is in the first duty, i.e. main control module 80
Control the first switch K1, second switch K2 and the 3rd switch K3 Guan Bi, and control the 4th switch K4 disconnects, and now obtains electronic
The first total voltage between anode and the negative pole of automobile, and the first car body voltage that battery cathode is to electric automobile.
Further, above-mentioned steps S10 includes: when receiving the first control instruction, according to described first control instruction
Obtain the negative pole of described battery to described electric automobile at the first magnitude of voltage of current point in time, and after obtaining interval Preset Time
The negative pole of described battery the second magnitude of voltage to described electric automobile；
Judge that whether the difference between described first magnitude of voltage and described second magnitude of voltage is less than or equal to first set
Voltage threshold；
The most then obtain and specify in the time period average of the voltage between anode and the negative pole of described electric automobile to set
It is set to described first total voltage, and to obtain described battery cathode be described to the mean set of the voltage of described electric automobile
One car body voltage.
Due to the second electric capacity C1 and the existence of the second electric capacity C2, the voltage detecting battery is caused exponentially to change,
Therefore can judge whether the second electric capacity C1 and the second electric capacity C2 is full of by detecting the rate of change of voltage.Charged by normal RC
Curve understands, and electric capacity is during charging, and the rate of change of voltage from large to small, then levels off to 0.When detection cell voltage
When rate of change is close to 0, it is believed that electric capacity is full of, complete the self-adapting detecting to electric capacity charging.
Specifically, in real time or interval Preset Time obtain the filtering of the second filtration module 50 output after battery cathode to car body
Magnitude of voltage, wherein, U (N-1) is designated as the magnitude of voltage when previous time point, and U (N) is designated as the magnitude of voltage of latter time point, Uset
Represent the first voltage threshold set.I.e. obtain the negative pole of battery to electric automobile at the first magnitude of voltage U (N-of current point in time
, and obtain the negative pole of battery the second magnitude of voltage U (N) to electric automobile after the Preset Time of interval 1).When | U (N)-U (N-1) | <
During=Uset, represent the first electric capacity C1 and the second electric capacity C2 charging complete.Then start to continuously acquire the most respectively
First magnitude of voltage AN2 and the second magnitude of voltage AN4, is set as electric automobile after the first magnitude of voltage AN2 averaged that will obtain
Anode and negative pole between the first total voltage UA, and be set as that battery is born after being averaged by the second magnitude of voltage AN4
Extremely the first car body voltage U1 to electric automobile.
Step S20, when receiving the second control instruction, obtain described electric automobile according to described second control instruction
The second total voltage between anode and negative pole, and the second car body voltage that described battery cathode is to described electric automobile；
This second control instruction is that main control module 80 controls switch module 30 and is in the second duty, i.e. main control module 80
Control the first switch K1, second switch K2 and the 4th switch K4 Guan Bi, and control the 3rd switch K3 disconnects.Now obtain electronic
The second total voltage between anode and the negative pole of automobile, and the second car body voltage that battery cathode is to electric automobile.
Further, above-mentioned steps S20 includes: when receiving the second control instruction, according to described second control instruction
Obtain the negative pole of described battery to described electric automobile in the third voltage value of current point in time, and after obtaining interval Preset Time
The negative pole of described battery the 4th magnitude of voltage to described electric automobile；
Judge that whether the difference between described third voltage value and described 4th magnitude of voltage is less than or equal to second set
Voltage threshold；
The most then obtain and specify in the time period average of the voltage between anode and the negative pole of described electric automobile to set
It is set to described second total voltage, and to obtain described battery cathode be described to the mean set of the voltage of described electric automobile
Two car body voltages.
Specifically, in real time or interval Preset Time obtain the filtering of the second filtration module output after battery cathode to car body
Magnitude of voltage, wherein, U'(N-1) it is designated as the magnitude of voltage when previous time point, U'(N) it is designated as the magnitude of voltage of latter time point, U'set
Represent the second voltage threshold set.Even obtaining the negative pole of battery to electric automobile in third voltage value U' of current point in time
(N-1), and obtain the negative pole of battery the 4th magnitude of voltage U'(N to electric automobile after the Preset Time of interval).When | U'(N)-U'
(N-1) | during≤U'set, represent the first electric capacity C1 and the second electric capacity C2 charging complete.Then start within a specified time to distinguish
Continuously acquire third voltage value and the 4th magnitude of voltage, after the third voltage value averaged that will obtain, be set as electric automobile
The second total voltage UB between anode and negative pole, and it is set as that battery cathode is to electricity after being averaged by the 4th magnitude of voltage
Second car body voltage U2 of electrical automobile.
It should be noted that, the execution sequence of above-mentioned steps S10 and step S20 can mutually be exchanged, when this Preset Time, appointment
Between, the concrete value of the first voltage threshold, the second voltage threshold can arrange as the case may be and flexibly.
Step S30, according to described first total voltage, described first car body voltage, described second total voltage and described second
Car body voltage, obtains the dielectric strength of described electric automobile.
After obtaining the first total voltage, the first car body voltage, the second total voltage and the second car body voltage, can be total according to first
Voltage, the first car body voltage, the second total voltage and the second car body voltage are calculated the first resistance R1's and the second resistance R2
Resistance, the first resistance R1 and the second resistance R2 are respectively anode resistance and the negative terminal resistance of calculated battery, according to this just
The resistance of end resistance and negative terminal resistance determines the dielectric strength of electric automobile.
The present embodiment is by obtaining the first total voltage between battery 10 positive pole B+ and negative pole B-and institute pond negative pole B-to electricity
First car body voltage of electrical automobile, and obtain the second total voltage between battery 10 positive pole B+ and negative pole B-and battery 10 negative pole
The B-the second car body voltage to electric automobile, determines the dielectric strength of electric automobile.The total voltage of battery is divided into first total
Voltage UA and the second total voltage UB, evaded the impact on testing result of the stagnation pressure ripple to a certain extent.It addition, use whole Battery pack
The negative pole of 10, as reference, avoids the impact of negative voltage, it is only necessary to single supply can complete the process of all signals, the softest
Use adaptive algorithm on part, be adapted to different car body capacitance requirements.Not only reduce the complexity of hardware circuit, and
Improve reliability and the convenience of the Insulation monitoring to electric automobile.
Further, insulation detecting method first embodiment based on above-mentioned electric automobile, it is proposed that the electronic vapour of the present invention
Insulation detecting method second embodiment of car, includes after above-mentioned steps S30 in this embodiment:
When the dielectric strength of described electric automobile is less than the intensity threshold set, by the dielectric strength of described electric automobile
Mate with default dielectric strength interval, determine that the dielectric strength at described dielectric strength place is interval；
According to the mapping relations between described dielectric strength interval and dielectric strength grade, by right for described dielectric strength interval
The dielectric strength grade answered is defined as the dielectric strength grade that described electric automobile is current；
According to the mapping relations between described dielectric strength grade and type of alarm, the insulation current to described electric automobile
Strength grade is reported to the police by corresponding type of alarm.
In the present embodiment, dielectric strength can be divided into different intensity interval, the insulation pre-setting electric automobile is strong
Mapping relations between degree and dielectric strength interval, each dielectric strength is interval for different dielectric strength grades, such as, can
Arrange dielectric strength grade to be incremented by along with weakening of dielectric strength, i.e. dielectric strength the highest grade, dielectric strength the most weak, right
The harm of human body is the biggest.Each dielectric strength grade is correspondingly arranged different type of alarms respectively, and such as, dielectric strength grade is
The type of alarm of one-level is the flicker of LED, dielectric strength grade be the type of alarm of two grades be two LED flickers, absolutely
Edge strength grade is that the type of alarm of three grades is buzzer rings 10 seconds, etc..
After the above-mentioned dielectric strength obtaining electric automobile, first determine whether that whether the dielectric strength of this electric automobile is less than setting
Fixed intensity threshold, if the dielectric strength of electric automobile is more than or equal to the intensity threshold set, then illustrates the electricity of electric automobile
Being pressed in the range of human-body safety, be now made without reporting to the police, the intensity threshold of this setting can set according to actual needs
Put.If the dielectric strength of electric automobile is less than the intensity threshold set, then the overtension of electric automobile is described, may endanger
To human body, now the dielectric strength of electric automobile is mated with the dielectric strength interval preset, determine dielectric strength place
Dielectric strength interval.Then according to the mapping relations between this dielectric strength interval and dielectric strength grade, by dielectric strength
Interval corresponding dielectric strength grade is defined as the dielectric strength grade that electric automobile is current.Further according to dielectric strength grade and report
Mapping relations between police's formula, are reported to the police by corresponding type of alarm to the dielectric strength grade that electric automobile is current,
User is facilitated to take appropriate measures, it is to avoid to cause unnecessary harm.
In the insulation detecting circuit of the present embodiment electric automobile, when the dielectric strength of electric automobile is the strongest less than set
Degree threshold value, can be reported to the police accordingly by master control module controls alarm module, improve safety and the Insulation monitoring of user
Motility.
These are only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description and accompanying drawing content are made convert, or are directly or indirectly used in other relevant skills
Art field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. the insulation detecting circuit of an electric automobile, it is characterised in that the insulation detecting circuit of described electric automobile includes electricity
Pond, detection module, switch module, multidiameter option switch module, analog-to-digital conversion module and main control module；Described battery successively with institute
State detection module, described switch module, described multidiameter option switch module, described analog-to-digital conversion module and described main control module even
Connecing, described main control module is connected with described switch module and described multidiameter option switch module the most respectively；
When switch module described in described master control module controls is in the first duty, described battery is entered by described detection module
Row detection, the first total voltage between described anode and the negative pole that will obtain and described battery cathode are to described electric automobile
The first car body voltage, carry out passing after analog digital conversion by described multidiameter option switch module transfer to described analog-to-digital conversion module
Transport to described main control module；
When switch module described in described master control module controls is in the second duty, described battery is entered by described detection module
Row detection, the second total voltage between described anode and the negative pole that will obtain and described battery cathode are to described electric automobile
The second car body voltage, after carrying out analog digital conversion by described multidiameter option switch module transfer to described analog-to-digital conversion module,
Transmission is to described main control module；
Described main control module according to described first total voltage received, described first car body voltage, described second total voltage and
Described second car body voltage determines the dielectric strength of described electric automobile.
2. the insulation detecting circuit of electric automobile as claimed in claim 1, it is characterised in that the insulation inspection of described electric automobile
Slowdown monitoring circuit also includes the first filtration module and the second filtration module, described first filtration module and described second filtration module respectively
It is connected between described switch module and described multidiameter option switch module.
3. the insulation detecting circuit of electric automobile as claimed in claim 1, it is characterised in that described detection module includes first
Electric capacity, the second electric capacity, the first resistance and the second resistance；
One end of described first electric capacity negative pole with described second electric capacity and described battery successively is connected, described first electric capacity another
One end is connected with the positive pole of described battery；
One end of described first resistance negative pole with described second resistance and described battery successively is connected, described first resistance another
One end connects and is connected with the positive pole of described battery；
Described first electric capacity and described second electric capacity indirectly, described first resistance and described second resistance indirectly.
4. the insulation detecting circuit of electric automobile as claimed in claim 1, it is characterised in that described switch module includes first
Switch, second switch, the 3rd switch, the 4th switch, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
8th resistance, the 9th resistance and the tenth resistance；
One end of described first switch successively with described 3rd resistance, described 4th resistance, described 5th resistance, described second open
The negative pole of pass, described 6th resistance and described battery connects, and the other end of described first switch is connected with the positive pole of described battery；
Described 4th resistance and described 5th resistance indirectly, be connected to described the between described second switch and described 6th resistance
Two filtration modules；
Described 3rd switch one end successively with described 7th resistance, described 8th resistance, described 4th switch and described battery
Negative pole connect, described 3rd switch the other end be connected with the positive pole of described battery；Described 7th resistance and described 8th electricity
Resistance indirectly；
One end of described 9th resistance negative pole with described tenth resistance and described battery successively is connected, described 9th resistance another
One end is connected with the positive pole of described battery；Described first filtering mould it is connected between described 9th resistance and described tenth resistance
Block.
5. the insulation detecting circuit of electric automobile as claimed in claim 4, it is characterised in that when described first switching, described
Second switch and described 3rd switch Guan Bi, and the described 4th when switching off, described switch module is in the first duty；
When described first switching, described second switch and described 4th switch Guan Bi, and the described 3rd when switching off, described switching molding
Block is in the second duty.
6. the insulation detecting circuit of the electric automobile as according to any one of claim 1-5, it is characterised in that described master control mould
Block is also associated with alarm module.
7. the insulation detecting method of an electric automobile, it is characterised in that the insulation detecting method of described electric automobile includes:
When receiving the first control instruction, obtain the anode of described electric automobile with negative according to described first control instruction
The first total voltage between pole, and the first car body voltage that described battery cathode is to described electric automobile；
When receiving the second control instruction, obtain the anode of described electric automobile with negative according to described second control instruction
The second total voltage between pole, and the second car body voltage that described battery cathode is to described electric automobile；
According to described first total voltage, described first car body voltage, described second total voltage and described second car body voltage, obtain
The dielectric strength of described electric automobile.
8. the insulation detecting method of electric automobile as claimed in claim 7, it is characterised in that described receiving the first control
During instruction, obtain the first total voltage between anode and the negative pole of described electric automobile according to described first control instruction,
And the first car body voltage of described electric automobile is included by described battery cathode:
When receiving the first control instruction, obtain the negative pole of described battery to described electronic vapour according to described first control instruction
Car is at the first magnitude of voltage of current point in time, and obtains after the Preset Time of interval the negative pole of described battery to described electric automobile
Second magnitude of voltage；
Judge that whether the difference between described first magnitude of voltage and described second magnitude of voltage is less than or equal to the first voltage set
Threshold value；
The most then obtain and specify in the time period mean set of the voltage between anode and the negative pole of described electric automobile to be
Described first total voltage, and to obtain described battery cathode to the mean set of the voltage of described electric automobile be described first car
Bulk voltage.
9. the insulation detecting method of electric automobile as claimed in claim 7, it is characterised in that described receiving the second control
During instruction, obtain the second total voltage between anode and the negative pole of described electric automobile according to described second control instruction,
And the second car body voltage of described electric automobile is included by described battery cathode:
When receiving the second control instruction, obtain the negative pole of described battery to described electronic vapour according to described second control instruction
Car is in the third voltage value of current point in time, and obtains after the Preset Time of interval the negative pole of described battery to described electric automobile
4th magnitude of voltage；
Judge that whether the difference between described third voltage value and described 4th magnitude of voltage is less than or equal to the second voltage set
Threshold value；
The most then obtain and specify in the time period mean set of the voltage between anode and the negative pole of described electric automobile to be
Described second total voltage, and to obtain described battery cathode to the mean set of the voltage of described electric automobile be described second car
Bulk voltage.
10. the insulation detecting method of electric automobile as claimed in any one of claims 7-9, it is characterised in that described basis
Described first total voltage, described first car body voltage, described second total voltage and described second car body voltage, obtain described electronic
Include after the dielectric strength of automobile:
When the dielectric strength of described electric automobile is less than the intensity threshold set, by the dielectric strength of described electric automobile with pre-
If dielectric strength interval mate, determine that the dielectric strength at described dielectric strength place is interval；
According to the mapping relations between described dielectric strength interval and dielectric strength grade, by corresponding for described dielectric strength interval
Dielectric strength grade is defined as the dielectric strength grade that described electric automobile is current；
According to the mapping relations between described dielectric strength grade and type of alarm, the dielectric strength current to described electric automobile
Grade is reported to the police by corresponding type of alarm.
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| CN110703047A (en) * | 2018-07-09 | 2020-01-17 | 宝沃汽车（中国）有限公司 | Insulation testing method and device for electric automobile and electric automobile |
| CN110703048A (en) * | 2019-09-05 | 2020-01-17 | 安徽力高新能源技术有限公司 | Self-adaptive method for insulation monitoring time of electric automobile |
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| CN111929500A (en) * | 2019-05-13 | 2020-11-13 | 上海海拉电子有限公司 | Y-capacitor balance detection method, system and circuit |
| CN114184960A (en) * | 2020-09-07 | 2022-03-15 | 上海汽车集团股份有限公司 | Vehicle and insulation monitoring circuit for vehicle battery |
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| CN109212385A (en) * | 2017-06-29 | 2019-01-15 | 宝沃汽车（中国）有限公司 | The vehicle circuitry insulation detecting method and device of electric car |
| CN108037427A (en) * | 2017-12-22 | 2018-05-15 | 东软集团股份有限公司 | A kind of equipment, dynamical system and automobile for detecting power battery pack insulating properties |
| CN110389289A (en) * | 2018-04-18 | 2019-10-29 | 宁德时代新能源科技股份有限公司 | insulation fault detection method and control device |
| CN110389289B (en) * | 2018-04-18 | 2021-06-11 | 宁德时代新能源科技股份有限公司 | Insulation fault detection method and control device |
| CN110703047A (en) * | 2018-07-09 | 2020-01-17 | 宝沃汽车（中国）有限公司 | Insulation testing method and device for electric automobile and electric automobile |
| CN110703047B (en) * | 2018-07-09 | 2021-07-20 | 宝沃汽车（中国）有限公司 | Insulation testing method and device for electric automobile and electric automobile |
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| CN111929500B (en) * | 2019-05-13 | 2023-01-03 | 上海海拉电子有限公司 | Y-capacitor balance detection method, system and circuit |
| CN110703048A (en) * | 2019-09-05 | 2020-01-17 | 安徽力高新能源技术有限公司 | Self-adaptive method for insulation monitoring time of electric automobile |
| CN111505380A (en) * | 2020-04-24 | 2020-08-07 | 东软睿驰汽车技术（沈阳）有限公司 | Vehicle insulation resistance detection device, system and electric automobile |
| CN114184960A (en) * | 2020-09-07 | 2022-03-15 | 上海汽车集团股份有限公司 | Vehicle and insulation monitoring circuit for vehicle battery |
| CN115494338A (en) * | 2022-11-08 | 2022-12-20 | 荣耀终端有限公司 | Detection method and detection device |
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