CN108037366A - The insulation resistance detecting system and its detection method of a kind of electric automobile - Google Patents
The insulation resistance detecting system and its detection method of a kind of electric automobile Download PDFInfo
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- CN108037366A CN108037366A CN201810069963.5A CN201810069963A CN108037366A CN 108037366 A CN108037366 A CN 108037366A CN 201810069963 A CN201810069963 A CN 201810069963A CN 108037366 A CN108037366 A CN 108037366A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention is suitable for automobile technical field, there is provided the insulation resistance detecting system of electric automobile, including signal generation unit, for producing the AC signal of predetermined frequency and being transferred to electric automobile；Voltage acquisition unit, for gathering the operating voltage data and false voltage data of electric automobile, is sent to micro-control unit；Micro controller unit, whether the insulation resistance for judging electric automobile according to operating voltage data is normal, if failure judgement, control instruction is sent to signal generation unit and switch control unit；It is additionally operable to calculate the resistance value of the insulation resistance according to false voltage data；Signal generation unit, is additionally operable to after open command is received, and disconnects alternating message source；Switch control unit, for according to switch close command closure switch.The present invention can detect the insulation resistance of electric automobile in real time, and the resistance value of insulation resistance is calculated according to the voltage data detected, determine the source of trouble according to the resistance value being calculated, improve accuracy of detection.
Description
Technical field
The invention belongs to automobile technical field, more particularly to a kind of insulation resistance detecting system of electric automobile and its detection
Method.
Background technology
Power source of the battery pack as electric automobile, the quality of its operating index directly decide the property of electric automobile whole
Energy.In order to which output power, the voltage of pure electric automobile battery pack are generally higher than 300V higher, this is to high-voltage battery group and car
Insulation performance between chassis proposes very high requirement.Battery pack in electric automobile vehicle actual motion can by dust,
The influence of the factors such as vibrations, moist and dielectric aging, causes insulation performance between high-voltage battery group and vehicle chassis tight
Decline again, and then the security incident such as failure, on fire, serious threat personnel, the safety of electrical equipment may be caused.Therefore, study
The insulation resistance of high pressure electric car battery pack detects in real time, and for improving, insulation resistance fault detect is horizontal to have important meaning
Justice.
At present, following three kinds are included to the insulation resistance detection method of batteries of electric automobile group：First, cut using outer connecting resistance
Method is changed, this method is detected straight-flow system using regular offline mode, without real-time；2nd, using DC leakage
Electric current detecting method, compared to outer connecting resistance switching method, it is among two resistance with positive and negative electrode insulation against ground resistor coupled in parallel
A current sensor is added, to measure the DC leakage current value；3rd, using balanced bridge method, it passes through external
Resistance judges whether outer connecting resistance balances with insulation resistance electric bridge, and judges whether insulation resistance is abnormal, therefore cannot accurately examine
Insulation resistance, the insulation performance of non-essential resistance reduction system in parallel are surveyed, without real-time.
In conclusion Traditional DC system insulating resistance detection method does not have real-time, and there are accuracy in detection not
The problem of high, may cause fault detection system to fail or report by mistake, can trigger security incident when serious.
The content of the invention
The technical problems to be solved by the invention are insulation resistance detecting system and its inspection for providing a kind of electric automobile
Survey method, it is intended to solve Traditional DC system insulating resistance detection method without detection characteristic in real time, there are accuracy in detection
The problem of not high.
The present invention is achieved in that a kind of insulation resistance detecting system of electric automobile, including voltage acquisition unit, micro-
Controller unit, signal generating unit and switch control unit, the signal generation unit include alternating message source, the switch
Control unit includes some switches；
The signal generation unit, electricity is transferred to for producing the AC signal of predetermined frequency, and by the AC signal
Electrical automobile, so that the voltage acquisition unit detects the operating voltage number of the battery pack of the electric automobile in normal state
According to；
The voltage acquisition unit, for when the electric automobile is in normal condition, gathering the work of the electric automobile
Make voltage data, and the operating voltage data are transferred to the micro controller unit；It is additionally operable to when the electric automobile exists
During malfunction, the false voltage data of the electric automobile are gathered, and give the false voltage data sending to the micro-control
Unit processed；
The micro controller unit, for judging that the insulation resistance of the electric automobile is according to the operating voltage data
It is no normal, if judging the insulation resistance failure, open command is sent to the signal generation unit, and control to the switch
Unit processed sends switch close command；It is additionally operable to calculate the resistance value of the insulation resistance according to the false voltage data；
The signal generation unit, is additionally operable to after the open command is received, and disconnects the alternating message source；
The switch control unit, for closing the switch according to the switch close command.
Further, the insulation resistance detecting system further includes Alarm Unit；
The micro-control unit, if being additionally operable to judge the insulation resistance failure, it is single to the alarm to send alarm command
Member；
The Alarm Unit, for sending alarm signal according to the alarm command.
Further, the insulation resistance detecting system further includes indicating member；
The micro-control unit, is additionally operable to determine the source of trouble according to the resistance value for the insulation resistance being calculated, according to
The source of trouble sends indicator to the indicating member；
The indicating member, for sending indication signal according to the indicator, the indication signal is used to indicate institute
State the source of trouble.
Further, it is exhausted over the ground to include voltage source, cathode insulation against ground resistance and anode for the battery pack of the electric automobile
Edge resistance；
The signal generation unit includes low-frequency ac signal source, and the voltage acquisition unit includes measurement resistance, isolation
Capacitance, the first access resistance and the second access resistance, the switch control unit include first switch and second switch；
The cathode of the voltage source connects the first end of the cathode insulation against ground resistance, the anode connection of the voltage source
The first end of the anode insulation against ground resistance, the second end of the cathode insulation against ground resistance and anode insulation against ground electricity
The second end of resistance is connected；
The first end of the cathode connection measurement resistance in the low-frequency ac signal source, the low-frequency ac signal source
Anode connects the second end of the cathode insulation against ground resistance；The second end of the measurement resistance connects the of the isolation capacitance
One end；The second end of the isolation capacitance connects the cathode of the voltage source；One end of the first access resistance passes through described
First switch connects the cathode of the voltage source, and the other end of the first access resistance connects the cathode insulation against ground resistance
Second end；One end of the second access resistance connects the anode of the voltage source by the second switch, and described second
The other end for accessing resistance connects the second end of the anode insulation against ground resistance, and is grounded.
Further, the scope of the frequency w in the low-frequency ac signal source is：2Hz≤w≤100Hz.
Present invention also offers a kind of detection method of insulation resistance detecting system as described above, including：
Disconnect the first switch and the second switch, the exchange letter of the low-frequency ac signal source output predetermined frequency
Number；
The voltage at the measurement resistance both ends is obtained, the cathode is calculated over the ground according to the voltage at described measurement resistance both ends
The parallel resistance value of insulation resistance and the anode insulation against ground resistance；
The parallel resistance value is judged whether in the range of predetermined resistance value, if not existing, disconnects the low-frequency ac letter
Number source, closes the first switch and the second switch；
The first access resistance and the voltage at the second access resistance both ends are obtained respectively, according to the described first access
Resistance and the voltage at the second access resistance both ends calculate the cathode insulation against ground resistance and anode insulation against ground resistance
Resistance value；
The source of trouble is determined according to the resistance value of the cathode insulation against ground resistance and anode insulation against ground resistance.
Further, the voltage at the measurement resistance both ends is represented with Um, the low-frequency ac signal source is represented with Us
Voltage, the frequency in the low-frequency ac signal source is represented with w, and the capacitance of the partition capacitance is represented with C, represented with R described in
The resistance value of resistance is measured, the resistance value of cathode insulation against ground resistance is represented with Rp, the anode insulation against ground resistance is represented with Rn
Resistance value, represents the parallel resistance value of cathode insulation against ground resistance and anode the insulation against ground resistance with Rpn, described in the basis
The voltage for measuring resistance both ends calculates the parallel resistance value of the cathode insulation against ground resistance and the anode insulation against ground resistance
Including：
According to formulaAnd formulaThe parallel resistance value is calculated,
I.e.：
Further, the voltage at the first access resistance both ends is represented with Up, the second access resistance is represented with Un
The voltage at both ends, the resistance value of the first access resistance is represented with R1, and the resistance value of the second access resistance is represented with R2, described
The cathode insulation against ground resistance is calculated according to the voltage of the described first access resistance and the second access resistance both ends and is born
The resistance value of pole insulation against ground resistance includes：
Pass through formulaAnd formulaCathode pair is calculated
The resistance value Rp of the ground insulation resistance and resistance value Rn of anode insulation against ground resistance, i.e.,：
Compared with prior art, the present invention beneficial effect is：The embodiment of the present invention is adopted in real time by voltage acquisition unit
Collecting voltage data, micro controller unit are judged that, when judging that current insulation resistance is normal, circulation is held by the voltage data
Row failure detection steps, when judging that insulation resistance breaks down, cut-off signal generation unit, controlling switch control unit closure
Switch, the false voltage data failure judgement source gathered according to voltage acquisition unit, the present invention can detect electric automobile in real time
Insulation resistance, and the resistance value of insulation resistance is calculated according to the voltage data detected, it is true according to the resistance value being calculated
Determine the source of trouble, improve accuracy of detection.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of the insulation resistance detecting system of electric automobile provided in an embodiment of the present invention；
Fig. 2 is a kind of detailed construction signal of the insulation resistance detecting system of electric automobile provided in an embodiment of the present invention
Figure；
Fig. 3 is a kind of flow of the detection method of the insulation resistance detecting system of electric automobile provided in an embodiment of the present invention
Figure；
Fig. 4 be a kind of insulation resistance detecting system of electric automobile provided in an embodiment of the present invention in normal state etc.
Imitate circuit diagram；
Fig. 5 be under a kind of insulation resistance detecting system of electric automobile provided in an embodiment of the present invention is nonserviceabled etc.
Imitate circuit diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
To be adopted as shown in Figure 1, an embodiment of the present invention provides a kind of insulation resistance detecting system of electric automobile, including voltage
Collect unit 101, micro controller unit 102, signal generating unit 103 and switch control unit 104；
Signal generation unit 103, including alternating message source, for producing the AC signal of predetermined frequency, and by the friendship
Signal transmission is flowed to electric automobile, so that voltage acquisition unit 101 detects the battery pack of the electric automobile in normal state
Operating voltage data；
Voltage acquisition unit 101, for when the electric automobile is in normal condition, gathering the work of the electric automobile
Voltage data, and the operating voltage data are transferred to micro controller unit 102；It is additionally operable to when the electric automobile is in failure
During state, the false voltage data of the electric automobile are gathered, and by the false voltage data sending to micro-control unit
102；
Micro controller unit 102, for judging that the insulation resistance of the electric automobile is according to the operating voltage data
No normal, if judging, the insulation resistance is normal, keeps normal condition, if the insulation resistance failure is judged, to signal
Generation unit 103 sends open command, and sends switch close command to switch control unit 104；It is additionally operable to according to the event
Hinder the resistance value that voltage data calculates the insulation resistance；
Signal generation unit 103, is additionally operable to after the open command is received, and disconnects the alternating message source；
Switch control unit 104, including some switches, for closing the switch according to the switch close command.
In order to make the operator of electric automobile promptly know the working condition and fault message of electric automobile in time,
The embodiment of the present invention further includes the indicating member of the Alarm Unit and the instruction source of trouble for being alerted, micro controller unit
After 102 voltage datas gathered according to voltage acquisition unit 101 judge that insulation resistance breaks down, announcement will be sent to Alarm Unit
Alert instruction, the alarm command are used to control Alarm Unit to send warning information, which includes audible alarm, photoelectric alarm
Deng.When the resistance value of insulation resistance is calculated according to 101 collection voltages data of voltage acquisition unit in micro controller unit 102, and
After determining the source of trouble according to the resistance value of the insulation resistance, indicator is sent to indicating member, which is used to control this
Indicating member sends the indication signal for indicating the source of trouble.
Further, in order to enable the operator of electric automobile or owner quickly to know batteries of electric automobile group
Situation, the embodiment of the present invention further includes wireless transmission unit, micro controller unit 101 judging insulation resistance failure or therefore
Behind barrier source, by transmitting wirelessly unit, to preset client, either mobile terminal sends message push or short message is reminded, energy
It is enough rapidly to notify the operator or the owner in time.
Fig. 2 shows the detailed construction of insulation resistance detecting system provided in an embodiment of the present invention, wherein, electric automobile
Battery pack includes voltage source U, cathode insulation against ground resistance Rp and anode insulation against ground resistance Rn；
Signal generation unit 103 includes low-frequency ac signal source Us, and voltage acquisition unit 101 includes measurement resistance R, isolation
Capacitance C, the first access resistance R1 and the second access resistance R2, switch control unit 104 include first switch S1 and second switch
S2；
The first end of the cathode connection cathode insulation against ground resistance Rp of voltage source U, the anode connection anode of voltage source U is over the ground
The first end of insulation resistance Rn, the second end of cathode insulation against ground resistance Rp are connected with the second end of anode insulation against ground resistance Rn
Connect；
The first end of the cathode connection measurement resistance R of low-frequency ac signal source Us, the anode of low-frequency ac signal source Us connect
Connect the second end of cathode insulation against ground resistance Rp；Measure the first end of the second end connection isolation capacitance C of resistance R；Isolation capacitance C
Second end connection voltage source U cathode；One end of first access resistance R1 by first switch S1 connection voltage sources U just
Pole, the second end of the other end connection cathode insulation against ground resistance Rp of the first access resistance R1；One end of second access resistance R2
Pass through the anode of second switch S2 connection voltage sources U, the other end connection anode insulation against ground resistance Rn of the second access resistance R2
Second end, and be grounded.
It is the detection part that needs of the battery pack of electric automobile in dotted line frame in Fig. 2, outer frame is provided in an embodiment of the present invention
The interlock circuit of insulation resistance detecting system, U are the voltage source of the battery pack of electric automobile, and RL is inscribed equivalent for electric automobile
Load, Rp are the cathode insulation against ground resistance of battery pack, and Rn is the anode insulation against ground resistance of battery pack, and Us believes for low-frequency ac
Number source, R are measurement resistance, and C is isolation capacitance, and R1, R2 need to be used when being the positive and negative anodes insulation against ground resistance calculations to battery pack
Access resistance.The detection of the positive and negative anodes insulation against ground resistance of the battery pack of electric car is divided into two parts：Fault detect and absolutely
Edge resistance calculations.Fault detect is that the parallel resistance value of positive and negative anodes insulation against ground resistance is calculated by measuring the voltage at R both ends,
And the insulation fault state of system is judged by the parallel resistance value, after insulation resistance failure is detected, disconnect equivalent load
RL, closure switch S1 and S2, respectively measurement access resistance R1, R2 both end voltage, can calculate positive and negative anodes insulation against ground resistance Rp,
The size of Rn.
Insulation resistance detecting system pin provided in an embodiment of the present invention can be to the straight-flow system insulated electro under complex environment
Resistance failure is monitored in real time, and the load on whole electric car does not influence, while in positive and negative anodes insulation against ground resistance
After some insulation resistance breaks down, the embodiment of the present invention can realize offline inspection, and calculate cathode insulation against ground resistance
Rp, the size of anode insulation against ground resistance Rn values, foundation is provided so as to fulfill the fault diagnosis for whole electric vehicle system.
In fig. 2, the structure of microprocessor unit 102 and its connection relation with other units, voltage acquisition is not shown
Unit 101 can also include except the measurement resistance R, isolation capacitance C, the first access resistance R and the second access resistance R2 that show
The Acquisition Circuit of the voltage data at measurement resistance R both ends is such as obtained, which is connected with micro controller unit 101, etc.
Effect load RL is expressed as the load that the battery pack of electric automobile is inscribed, and in a particular application, equivalent load RL can be by microcontroller
The control of device unit 102 is switched on or switched off, and can also detect that event occurs in the battery pack of electric automobile in micro controller unit 102
Barrier, after sending alarm according to the failure, the load of electric automobile is disconnected by operating personnel manually.Switch control unit 104 except
Outside first switch S1 and second switch S2, the on-off circuit that can be connected with micro controller unit 102 can also be included,
The on-off circuit is used for the state of disconnection or close command the controlling switch S1 and S2 sent according to micro controller unit 102.
Fig. 3 shows the detection method of insulation resistance detecting system provided in an embodiment of the present invention, including：
S301, disconnects the first switch and the second switch, the low-frequency ac signal source output predetermined frequency
AC signal；
S302, obtains the voltage at the measurement resistance both ends, described just according to the voltage calculating at described measurement resistance both ends
The parallel resistance value of pole insulation against ground resistance and the anode insulation against ground resistance；
Whether S303, judge the parallel resistance value in the range of predetermined resistance value；
S304, if not existing, disconnects the low-frequency ac signal source, closes the first switch and the second switch；
S305, obtains the first access resistance and the voltage at the second access resistance both ends respectively, according to described the
One access resistance and the voltage at the second access resistance both ends calculate the cathode insulation against ground resistance and anode insulation against ground
The resistance value of resistance；
S306, the source of trouble is determined according to the resistance value of the cathode insulation against ground resistance and anode insulation against ground resistance.
Detection method shown in Fig. 3 is divided into two detection parts, i.e. fault detect and insulation resistance calculates, and wherein failure is examined
Survey includes：(1) system begins into the fault detect of insulation resistance；(2) switch S1 and S2 is disconnected, is not connect in this case, being equivalent to
Enter resistance R1 and R2；(3) by measuring the voltage at measurement resistance R both ends, then can calculate positive and negative electrode insulation against ground resistance and
Join resistance value；(4) by the parallel resistance value come judge the positive and negative electrode insulation against ground resistance of system whether failure, if insulation resistance
Normally, then circulation performs fault detect and performs step (3), otherwise, carries out insulation resistance calculating.Wherein, insulating resistance value calculates
Part includes：(5) equivalent load RL, alternating message source Us are disconnected first, and closes the border S1 and S2, and access resistance R1 and R2 connect
Enter in the circuit shown in Fig. 2, insulation resistance detecting system is in off-line state at this time；(6) measurement accesses resistance R and R2 two respectively
The magnitude of voltage at end, the size of positive and negative electrode insulation against ground resistance Rp, Rn value can be calculated according to the magnitude of voltage at R1 and R2 both ends；(7)
Diagnose positive and negative electrode insulation against ground Resistance Fault；(8) insulation resistance detection terminates.In practical applications, according to national standard GB/
T18384.3-2015 requires insulation resistance to be not less than 100 Ω/V, therefore 100 Ω/V is multiplied battery voltage value can obtain minimum electricity
Whether resistance value, the resistance value for the positive and negative electrode insulation against ground resistance for judging to measure are less than 100 Ω/V, if being less than, judge faulty.
Fault detect in the embodiment of the present invention is the fault detect based on formula of having chance with, it is by injecting low-frequency ac signal
Source Us realizes the real-time detection of insulation resistance failure, and insulation resistance detecting system carries out failure inspection in the battery pack to electric automobile
Switch S1 and S2 is first disconnected before surveying, its equivalent circuit diagram is as shown in Figure 4.
Following equalities can be obtained by Fig. 4：
In equation (1), Um represents the voltage at measurement resistance R both ends, and Us represents the voltage of low-frequency ac signal source Us, w tables
Show the frequency of low-frequency ac signal source Us, C represents the capacitance of partition capacitance, and R represents the resistance value of measurement resistance R, and Rp is represented just
The resistance value of pole insulation against ground resistance Rp, Rn represent the resistance value of anode insulation against ground resistance Rn, and Rpn represents cathode insulation against ground resistance
The parallel resistance value of Rp and anode insulation against ground resistance Rn, i.e.,：
According to above-mentioned equation (1) and equation (2), can obtain：
According to above-mentioned equation (3), can calculate cathode insulation against ground resistance Rp and anode insulation against ground resistance Rn's and
Join resistance value Rpn, and by Rpn compared with pre-set threshold value Rth, the shape of insulation resistance is judged according to comparative result
State.
After definite insulation resistance breaks down, Rpn is the parallel value of cathode insulation resistance and negative insulation resistance, if
Rpn is less than Rth, it is likely that is that one in negative or positive electrode insulation fault occurs, so also further to measure Rp and Rn
Value, then with regard to that can judge cathode insulation fault or negative insulation failure.To further determine that the source of trouble, it is necessary to accurate
Insulating resistance value is calculated, the insulating resistance value calculated can provide foundation for the fault diagnosis of whole system.Detecting insulation
After resistance breaks down, equivalent load RL is disconnected, closes low-frequency ac signal source Us, closure switch S1 and S2, closure switch
S1 and S2 is equivalent in the first access resistance R1 and the second access resistance R2 access circuits, its equivalent circuit is as shown in Figure 5.
Below equation can be obtained by Fig. 5：
Below equation can be obtained by equation (3) and equation (4)：
By equation (5), the resistance of the resistance value Rp and anode insulation against ground resistance of cathode insulation against ground resistance can be calculated
Value Rn.
Two processes that the embodiment of the present invention is calculated by insulation failure detection and insulation resistance, form a kind of real-time, accurate
True insulation resistance detection method.This method had both realized the real-time monitoring of insulation resistance failure, while after also meeting exception
Insulation resistance accurately calculate, and real-time state monitoring process on whole load circuit without influence.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (8)
1. the insulation resistance detecting system of a kind of electric automobile, it is characterised in that including voltage acquisition unit, microcontroller list
Member, signal generating unit and switch control unit, the signal generation unit include alternating message source, the switch control unit
Including some switches；
The signal generation unit, electronic vapour is transferred to for producing the AC signal of predetermined frequency, and by the AC signal
Car, so that the voltage acquisition unit detects the operating voltage data of the battery pack of the electric automobile in normal state；
The voltage acquisition unit, for when the electric automobile is in normal condition, gathering the work electricity of the electric automobile
Data are pressed, and the operating voltage data are transferred to the micro controller unit；The voltage acquisition unit is additionally operable to work as institute
When stating electric automobile and nonserviceabling, the false voltage data of the electric automobile are gathered, and the false voltage data are sent out
Give the micro-control unit；
The micro controller unit, for whether just to judge the insulation resistance of the electric automobile according to the operating voltage data
Often, if judging the insulation resistance failure, open command is sent to the signal generation unit, and it is single to the switch control
Member sends switch close command；The micro controller unit is additionally operable to calculate the insulation resistance according to the false voltage data
Resistance value；
The signal generation unit, is additionally operable to after the open command is received, and disconnects the alternating message source；
The switch control unit, for closing the switch according to the switch close command.
2. insulation resistance detecting system as claimed in claim 1, it is characterised in that the insulation resistance detecting system further includes
Alarm Unit；
The micro-control unit, if being additionally operable to judge the insulation resistance failure, sends alarm command to the Alarm Unit；
The Alarm Unit, for sending alarm signal according to the alarm command.
3. insulation resistance detecting system as claimed in claim 1, it is characterised in that the insulation resistance detecting system further includes
Indicating member；
The micro-control unit, is additionally operable to determine the source of trouble according to the resistance value for the insulation resistance being calculated, according to described
The source of trouble sends indicator to the indicating member；
The indicating member, for sending indication signal according to the indicator, the indication signal is used to indicate the event
Barrier source.
4. insulation resistance detecting system as claimed in claim 1, it is characterised in that the battery pack of the electric automobile includes electricity
Potential source, cathode insulation against ground resistance and anode insulation against ground resistance；
The signal generation unit includes low-frequency ac signal source, the voltage acquisition unit include measurement resistance, isolation capacitance,
First access resistance and the second access resistance, the switch control unit include first switch and second switch；
The cathode of the voltage source connects the first end of the cathode insulation against ground resistance, described in the anode connection of the voltage source
The first end of anode insulation against ground resistance, the second end of the cathode insulation against ground resistance and the anode insulation against ground resistance
Second end is connected；
The first end of the cathode connection measurement resistance in the low-frequency ac signal source, the anode in the low-frequency ac signal source
Connect the second end of the cathode insulation against ground resistance；The second end of the measurement resistance connects the first of the isolation capacitance
End；The second end of the isolation capacitance connects the cathode of the voltage source；One end of the first access resistance passes through described the
One switch connects the cathode of the voltage source, and the other end of the first access resistance connects the cathode insulation against ground resistance
Second end；One end of the second access resistance connects the anode of the voltage source by the second switch, and described second connects
The other end for entering resistance connects the second end of the anode insulation against ground resistance, and is grounded.
5. insulation resistance detecting system as claimed in claim 4, it is characterised in that the frequency w in the low-frequency ac signal source
Scope be：2Hz≤w≤100Hz.
A kind of 6. detection method of the detecting system of insulation resistance as described in claim 4 or 5, it is characterised in that including：
Disconnect the first switch and the second switch, the AC signal of the low-frequency ac signal source output predetermined frequency；
The voltage at the measurement resistance both ends is obtained, the cathode insulation against ground is calculated according to the voltage at described measurement resistance both ends
The parallel resistance value of resistance and the anode insulation against ground resistance；
The parallel resistance value is judged whether in the range of predetermined resistance value, if not existing, disconnects the low-frequency ac signal source,
Close the first switch and the second switch；
The first access resistance and the voltage at the second access resistance both ends are obtained respectively, according to the described first access resistance
The resistance value of the cathode insulation against ground resistance and anode insulation against ground resistance is calculated with the voltage at the described second access resistance both ends；
The source of trouble is determined according to the resistance value of the cathode insulation against ground resistance and anode insulation against ground resistance.
7. detection method as claimed in claim 6, it is characterised in that the voltage at the measurement resistance both ends is represented with Um, with
Us represents the voltage in the low-frequency ac signal source, and the frequency in the low-frequency ac signal source is represented with w, with C represent described in every
The capacitance held is powered off, the resistance value of the measurement resistance is represented with R, the resistance value of cathode insulation against ground resistance is represented with Rp, with Rn
Represent the resistance value of the anode insulation against ground resistance, the cathode insulation against ground resistance and anode insulation against ground electricity are represented with Rpn
The parallel resistance value of resistance, the voltage at the described measurement resistance both ends of the basis calculate the cathode insulation against ground resistance and described negative
The parallel resistance value of pole insulation against ground resistance includes：
According to formulaAnd formulaThe parallel resistance value is calculated, i.e.,：
8. detection method as claimed in claim 7, it is characterised in that the electricity at the first access resistance both ends is represented with Up
Pressure, the voltage at the second access resistance both ends is represented with Un, and the resistance value of the first access resistance is represented with R1, is represented with R2
The resistance value of the second access resistance, it is described according to the described first access resistance and the potentiometer at the second access resistance both ends
Calculating the resistance value of cathode insulation against ground resistance and anode the insulation against ground resistance includes：
Pass through formulaAnd formulaCathode insulation against ground electricity is calculated
The resistance value Rp of the resistance and resistance value Rn of anode insulation against ground resistance, i.e.,：
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810069963.5A CN108037366A (en) | 2018-01-24 | 2018-01-24 | The insulation resistance detecting system and its detection method of a kind of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810069963.5A CN108037366A (en) | 2018-01-24 | 2018-01-24 | The insulation resistance detecting system and its detection method of a kind of electric automobile |
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| CN110174625A (en) * | 2019-05-23 | 2019-08-27 | 海南大学 | A kind of power battery pack resistance insulation monitoring system and monitoring algorithm |
| CN110967560A (en) * | 2019-03-01 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit, insulation detection method and battery management system |
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| CN112798975A (en) * | 2020-12-29 | 2021-05-14 | 智新控制系统有限公司 | Insulation detection circuit and detection method of high-voltage battery pack |
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| CN112798975A (en) * | 2020-12-29 | 2021-05-14 | 智新控制系统有限公司 | Insulation detection circuit and detection method of high-voltage battery pack |
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| CN113093037A (en) * | 2021-02-26 | 2021-07-09 | 肇庆小鹏新能源投资有限公司 | Battery failure detection device, method, module and vehicle |
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