CN106707116A - Electric automobile body insulation detection system and method - Google Patents
Electric automobile body insulation detection system and method Download PDFInfo
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- CN106707116A CN106707116A CN201611073275.3A CN201611073275A CN106707116A CN 106707116 A CN106707116 A CN 106707116A CN 201611073275 A CN201611073275 A CN 201611073275A CN 106707116 A CN106707116 A CN 106707116A
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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
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to an electric automobile body insulation detection system and method. The electric automobile body insulation detection system comprises a power supply protection circuit, an MCU (Micro Control Unit), a power supply isolation circuit, a voltage injection circuit, an internal storage circuit, a detection voltage injection feedback circuit, a resistance measurement circuit, a CAN, an operating state indication circuit, a switching value or PWM insulation fault level indication circuit. The electric automobile body insulation detection system further retains high precision of insulation resistance measurement on the basis of reducing the injection voltage and current, and can also assess which side of positive and negative buses has lower insulation resistance for the automobile body.
Description
Technical field
The present invention relates to electric automobile electrical insulation detection technique field, and in particular to a kind of electric automobile car body insulation inspection
Examining system and detection method.
Background technology
With the fast development of the pure electronic new-energy automobile of China, the security performance of pure electronic new-energy automobile is increasingly received
To concern.The high-pressure system more than 300V voltages is there is in pure electronic new-energy automobile, if high-tension battery positive pole（Or it is negative
Pole）Segment controller normal work on vehicle may be then influenceed to jeopardize driver and conductor's safety the defective insulation of chassis of vehicle body.Institute
It is a for detecting Insulation Inspection System of the vehicle high-tension battery to car body insulating properties to need.
The common scheme of Insulation Inspection System has on the market now：Accessory power supply scheme, current sense scheme, bridge-type resistance
Scheme and voltage injecting scheme.Chinese invention patent such as Publication No. CN104635057A discloses a kind of electric automobile insulation
Detecting system and control method, detecting system are made up of battery pack, insulated monitoring circuit and controller, and insulated monitoring circuit includes
Low-frequency signal injection, adaptive voltage compensation, voltage sample and warning device；Electricity is compensated to adaptive voltage by controller
Low-frequency voltage signal is injected on road, and the terminal impedance of sample circuit two is influenceed using the size of insulaion resistance, makes sample circuit in circuit
Gained partial pressure is changed, and controller is calculated using partial pressure value and obtain battery pack pair by partial pressure value in A/D acquisition sample circuits
The insulaion resistance on vehicle ground.And immediate with the scheme that present invention applicant does now is voltage injecting scheme, voltage injection
Detection method is to a high direct voltage is added between car body, by high-precision AD converted measurement by isolating transformer to measured point
The voltage of divider resistance, then resistance value is calculated by software.
Voltage injecting scheme due to injecting high-tension electricity between measured point and car body, this scheme can exist interference automobile other
The risk of controller, while easily causing electric shock to maintainer when maintainer is overhauled.
The content of the invention
Insulation monitoring is carried out to electric automobile using voltage pouring-in detection method, the detection method passes through isolating transformer
To measured point to a high direct voltage is added between car body, by the voltage of high-precision AD converted measurement divider resistance, then by soft
Part is calculated resistance value.This method fundamentally solves accumulator of electric car positive and negative busbar symmetrical insulation fault over the ground
The shortcoming that cannot be measured, and the insulating properties between high-tension circuit and car body can be also detected in the case of battery open circuit.But
It is following to be that this scheme be present：
1st, the program is injection high pressure, and the high pressure of main drive electric machine controller, oil pump and air pump motor controller can be disturbed to adopt herein
Sample, upsets its normal work；
2nd, program injection is high pressure, and when high-tension battery group is opened a way, Insulation Inspection System works on can make to maintainer
Into the risk got an electric shock；
3rd, the program cannot measure that high-voltage positive electrode is small to car body insulation resistance value or high voltage negative to car body insulation resistance value more
It is small；
4th, it is high pressure due to what is injected, leakage current can be increased when electric automobile insulating performance declines, it is easier to cause heat accumulation
And then there is the risk of fire.
Be there are problems that based on original voltage injecting scheme it is as described above, so base of the present invention applicant in the program
Improved on plinth, the technical scheme after improvement not only remains positive and negative busbar also measurable and battery equal to car body resistance
Also the characteristics of insulation resistance value between high-tension circuit and car body can be detected in the case of open circuit, four for also solving above ask
Topic.
The present invention provides a kind of electric automobile car body Insulation Inspection System and detection method, to solve the electronic of prior art
The technical problem that car body Insulation monitoring is present.The present invention is mainly in the low note of identical measurement insulation resistance value precise decreasing
Enter voltage to 40V, reduce interference of the injecting voltage to electric machine controller on vehicle, while Insulation monitoring after high-tension battery open circuit
System injecting voltage does not result in maintenance personal's electric shock yet.The electric current of its injection is limited while magnitude of voltage 40V is reduced most
Big value is 40uA, and the heat accumulation risk that due to leakage current is caused can be reduced after current limliting.Gone out by software and hardware combining mode comprehensive assessment
To car body, which side insulation resistance value is lower to car body and negative busbar for vehicle positive bus-bar.
The power consumption of injecting voltage of the present invention is extremely low, so its power supply from the low pressure accessory power supply of vehicle with regard to directly obtaining, pin
For from low pressure accessory power supply isolated input detecting system when take anti-reverse protection, Anti-surging and overvoltage protection, power supply and open
Total system circuit maintenance work 200mS, the input of low pressure accessory power supply are carried out with rear class injecting voltage using insulating power supply behind road
Electrical isolation.The present invention is also equipped with indicator lamp instruction equipment running status, device fault information and vehicle Abnormal Insulation letter simultaneously
The common storage of breath, device power number of times statistics, device hardware self-inspection, PWM or switch amount instruction insulation fault grade, CAN communication
Mode is communicated with vehicle, refreshes underlying programs by CAN.
The present invention is specifically adopted the following technical scheme that.
A kind of electric automobile car body Insulation Inspection System, including power protecting circuit, MCU micro-control units, power protection
One end connecting electric automobile vehicle low pressure accessory power supply of circuit to obtain low-power injecting voltage, power protecting circuit it is another
End connection MCU micro-control units；Electric automobile car body Insulation Inspection System also include power isolation circuit, voltage injection circuit,
Storage inside circuit, detection voltage injection feedback circuit, resistance measuring circuit, CAN, indicate running status circuit, switching value or
PWM indicates insulation fault level circuitry.
Preferably, the power protecting circuit connecting electric automobile vehicle low pressure accessory power supply, from low pressure accessory power supply
Place powers to electric automobile car body Insulation Inspection System.
In any of the above-described technical scheme preferably, set between the power protecting circuit and MCU micro-control units
There is power isolation circuit, the power isolation circuit carries out directly being carried out in high and low pressure system when voltage injects for high-pressure system
Electrical isolation, prevents interference of the high pressure to low pressure.
In any of the above-described technical scheme preferably, the MCU micro-control units respectively with CAN, storage inside circuit,
Switching value or PWM indicate insulation fault level circuitry, indicate running status circuit, detection voltage injection feedback circuit to be connected；
The CAN is communicated for vehicle, and underlying programs are refreshed by CAN, and the interface of CAN communicates with host computer and realizes information observation sum
According to analysis；The storage inside circuit is used for device fault information and vehicle Abnormal Insulation information is stored jointly；The detection electricity
Pressure injection enters feedback circuit for detecting whether whether correctly feedback voltage normally inject and detect injecting voltage value, detection voltage note
Entering the feedback information of feedback circuit is used to carry out the product self-inspection and the judgement of product facility fault level of Insulation Inspection System；It is described
Switching value or PWM indicate that insulation fault level circuitry is used for switching value or PWM indicates insulation fault grade to indicate, switching value or
PWM indicates insulation fault level circuitry connection external equipment, external equipment to indicate insulation fault grade electricity by switching value or PWM
Road obtains the testing result of Insulation Inspection System；The instruction running status circuit is used for indicator lamp instruction equipment running status.
In any of the above-described technical scheme preferably, the power protecting circuit include power input reverse-connection preventing circuit,
Power input anti-surge circuit, overvoltage crowbar；The power input reverse-connection preventing circuit is used to prevent below 100V power supplys
Reversal connection, to the protection of whole Insulation Inspection System when not powered for subsequent conditioning circuit after reverse power connection；The power input wave resistance
Circuit is gushed for preventing the surge voltage of 123V/100ms, for protecting Insulation Inspection System during surge and later normal
Work；Whole Insulation Inspection System works on when the overvoltage crowbar is used for the instant power-down of power input, for electricity
Whole Insulation Inspection System maintenance work 200mS after the open circuit of source.
In any of the above-described technical scheme preferably, the electric automobile car body Insulation Inspection System connection body high pressure
End；Car body high-pressure side includes that high-tension battery group, resistance R1, resistance R2, resistance R3, resistance Rx, the resistance R1, resistance R2 are in parallel
It is connected to high-tension battery group two ends and is connected with resistance measuring circuit, the resistance Rx connects high-tension battery group and in parallel with resistance R3
It is in parallel with voltage injection circuit, detection voltage injection feedback circuit again, the resistance measuring circuit, voltage injection circuit, detection
Voltage injection feedback circuit connects MCU micro-control units respectively；The MCU microcontrollers of the electric automobile car body Insulation Inspection System
, by voltage injection circuit to injecting voltage U1 on the car body of vehicle, voltage U1 is by insulaion resistance Rx and resistance R1, electricity for unit
A voltage U1P is produced on resistance R3 after resistance R2, is produced at resistance R3 when insulaion resistance Rx opens a way in Insulation Inspection System
Pressure estranged, the voltage of voltage U1P is two results of voltage superposition, in MCU micro-control units control voltage injection circuit again
A voltage U2 is injected to the car body of vehicle, voltage U2 produces a partial pressure U2P on resistance R3, the voltage injected on hardware
U1 and voltage U2 is known fixed voltage, then dividing on resistance R3 when voltage U1 and voltage U2 is opened a way under a proportional relationship
Pressure is balanced out, and calculates high-tension battery group integrally to the insulaion resistance Rx of car body.
In any of the above-described technical scheme preferably, the high-tension battery group is connected in parallel resistance Rp and resistance Rn, electricity
The composite measurement value for hindering both Rp and resistance Rn is reported to host computer or vehicle.
In any of the above-described technical scheme preferably, the measurement result of the electric automobile car body Insulation Inspection System
Insulaion resistance Rx is further measured, resistance Rp, resistance Rn and resistance R1, resistance R2, resistance R3 composition Wheatstone bridge, resistance R1 with
The resistance of resistance R2 is equal, and no current flows through on resistance R3 when resistance Rp is equal with the resistance of resistance Rn, resistance Rp<During resistance Rn
Electric current on resistance R3 is flowed from right to left, and a positive voltage, resistance Rp are produced on resistance R3>Electricity during resistance Rn on resistance R3
Stream is flowed from left to right, and a negative voltage is produced on resistance R3, and with the positive and negative busbar of this comprehensive assessment vehicle, to car body, which side leaks
Electric current is bigger, positioning defective insulation position.
In any of the above-described technical scheme preferably, the electric automobile car body Insulation Inspection System also includes storage core
Piece, the storage chip connects MCU micro-control units, and the storage chip is used for device power number of times statistics, equipment fault letter
Breath and vehicle Abnormal Insulation information are stored jointly.
The invention also discloses a kind of electric automobile car body insulation detecting method, the method is included described in as above any one
Electric automobile car body Insulation Inspection System, Insulation Inspection System obtains power supply from the vehicle low pressure accessory power supply of electric automobile,
Power isolation circuit and Insulation Inspection System are protected through power protecting circuit, suitable supply voltage is entered into line transformer
Isolated from power after be powered to all modules of whole Insulation Inspection System；After electricity on total system, MCU micro-control units
Control injecting voltage circuit carries out voltage injection, detection voltage injection circuit feed back successfully Injection Signal to MCU microcontroller lists
After unit, now resistance measuring circuit starts to detect the integral insulation electricity of the high-tension battery group positive and negative busbar to car body of car body high-pressure side
Resistance Rx；Insulation resistance value and insulation fault grade are delivered to the CAN communication system of vehicle by CAN, while using switching value
Or PWM indicates insulation fault level circuitry and indicates running status circuit to indicate the running status of Insulation Inspection System.
Compared with prior art, above-mentioned technical proposal of the invention has the advantages that：
Electric automobile car body Insulation Inspection System of the invention also retains survey on the basis of injecting voltage and electric current is reduced
The high accuracy of insulaion resistance is measured, while it is smaller to assess place's which side insulating resistance value to car body of positive and negative busbar.Due to this
The power supply of the Insulation Inspection System of invention is at low pressure accessory power supply, so having carried out anti-reverse, wave resistance at power input
Gush, power down maintenance work for a period of time with the circuit of insulating power supply, this electric automobile car body Insulation Inspection System is reached with this steady
Determine the purpose of trouble free service；
Electric automobile car body Insulation Inspection System of the invention is by CAN interface and the necessary information of host computer communication realizing system
Observation, can not only observe whether product self-inspection completes, equipment whether there is failure, insulation fault grade, measurement gained herein
Insulating resistance value, can also read electric number of times on the history insulation fault of storage, Insulation Inspection System carry out some data point
Analysis.Strengthen man-machine interaction using indicator lamp, it is convenient directly can also to be referred to by reading LED status in no computer
Lead the running status and insulation fault grade of Insulation Inspection System.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
Other accompanying drawings are obtained with according to these accompanying drawings.
Fig. 1 is according to the exhausted of a preferred embodiment of electric automobile car body Insulation Inspection System of the invention and detection method
Edge detecting system structural representation；
Fig. 2 is the insulation inspection of the preferred embodiment according to electric automobile car body Insulation Inspection System of the invention and detection method
Examining system overall operation schematic flow sheet；
Fig. 3 is the insulation inspection of the preferred embodiment according to electric automobile car body Insulation Inspection System of the invention and detection method
Electrical block diagram of the examining system to vehicle insulation measurement；
Fig. 4 is the insulation inspection of the preferred embodiment according to electric automobile car body Insulation Inspection System of the invention and detection method
Examining system is to vehicle insulation measurement and judges that positive and negative busbar which side circuit structure smaller to car body insulating resistance value is illustrated
Figure；
Fig. 5 is that the power supply of the preferred embodiment according to electric automobile car body Insulation Inspection System of the invention and detection method is defeated
Enter relay protective scheme schematic diagram；
Fig. 6 is the insulation inspection of the preferred embodiment according to electric automobile car body Insulation Inspection System of the invention and detection method
Examining system whole detection program flow diagram；
Fig. 7 is the electronic vapour of the preferred embodiment according to electric automobile car body Insulation Inspection System of the invention and detection method
Car vehicle surveys schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Prior art carries out Insulation monitoring using the pouring-in detection method of voltage to electric automobile, the detection method by every
From transformer to measured point to a high direct voltage is added between car body, by the voltage of high-precision AD converted measurement divider resistance,
Resistance value is calculated by software again.It is symmetrical over the ground that this method fundamentally solves accumulator of electric car positive and negative busbar
The shortcoming that insulation fault cannot be measured, and the insulation between high-tension circuit and car body can be also detected in the case of battery open circuit
Performance, but：Injection high pressure, can disturb the high pressure of main drive electric machine controller, oil pump and air pump motor controller to sample herein, disturb
Random its normal work；Due to injection is high pressure, and when high-tension battery group is opened a way, Insulation Inspection System works on meeting to maintenance
Personnel cause the risk got an electric shock；Cannot measure that high-voltage positive electrode is small to car body insulation resistance value or high voltage negative insulate to car body
Resistance is smaller；Due to injection is high pressure, leakage current can be increased when electric automobile insulating performance declines, it is easier to cause hot product
Progression and there is the risk of fire.In order to overcome electric automobile car body Insulation monitoring the problems of in the prior art, this
Inventive embodiments propose a kind of new electric automobile car body Insulation Inspection System and detection method, not only solve prior art and deposit
Above-mentioned technical problem, also can in the case of also retains positive and negative busbar also measurable and battery open circuit equal to car body resistance
The characteristics of detecting the insulation resistance value between high-tension circuit and car body.
Embodiment 1
As shown in figure 1, the electric automobile car body Insulation Inspection System described in the embodiment of the present invention includes power protecting circuit, MCU
Micro-control unit, power isolation circuit, voltage injection circuit, storage inside circuit, detection voltage injection feedback circuit, resistance are surveyed
Amount circuit, CAN, LED indicate running status circuit, switching value or PWM to indicate insulation fault level circuitry；Power protecting circuit connects
Electric automobile whole low pressure accessory power supply is connect, is powered to electric automobile car body Insulation Inspection System from low pressure accessory power supply；Electricity
Power isolation circuit is provided between protection circuit and MCU micro-control units, power isolation circuit is carried out for high-pressure system
Voltage directly carries out electrical isolation when injecting in high and low pressure system, prevents interference of the high pressure to low pressure；MCU micro-control units are distinguished
Insulation fault level circuitry, LED is indicated to indicate running status circuit, detection electricity with CAN, storage inside circuit, switching value or PWM
Pressure injection enters feedback circuit and is connected；CAN is communicated for vehicle, and underlying programs are refreshed by CAN, and interface and the host computer of CAN lead to
Reliable existing information observation and data analysis；Storage inside circuit is used for device fault information and vehicle Abnormal Insulation information is deposited jointly
Storage；Whether normally whether injection and detection injecting voltage value are correct for detecting feedback voltage for detection voltage injection feedback circuit,
The feedback information of detection voltage injection feedback circuit is used to carry out product self-inspection and product facility failure of Insulation Inspection System etc.
Level judges；Switching value or PWM indicate insulation fault level circuitry to indicate insulation fault grade to indicate for switching value or PWM, open
Pass is measured or PWM indicates insulation fault level circuitry connection external equipment, external equipment to indicate insulation fault by switching value or PWM
Level circuitry obtains the testing result of Insulation Inspection System；LED indicates running status circuit to be transported for LED light instruction equipment
Row state.Electric automobile car body Insulation Inspection System connection body high-pressure side；Car body high-pressure side includes high-tension battery group, resistance
R1, resistance R2, resistance R3, resistance Rx, wherein, resistance Rx is the overall insulation synthesis resistance relative to car body of high-tension battery；Electricity
Resistance R1, resistance R2 are connected in parallel in high-tension battery group two ends and are connected with resistance measuring circuit, and resistance Rx connects high-tension battery group simultaneously
It is in parallel with resistance R3 in parallel with voltage injection circuit, detection voltage injection feedback circuit again, resistance measuring circuit, voltage injection electricity
Road, detection voltage injection feedback circuit connect MCU micro-control units respectively；The MCU of electric automobile car body Insulation Inspection System is micro-
, by voltage injection circuit to injecting voltage U1 on the car body of vehicle, voltage U1 is by insulaion resistance Rx and resistance for control unit
A voltage U1P is produced after R1, resistance R2 on resistance R3, when insulaion resistance Rx opens a way in resistance R3 in Insulation Inspection System
Place produces partial pressure, and the voltage of voltage U1P is two results of voltage superposition, in the control voltage injection again of MCU micro-control units
Circuit injects a voltage U2 to the car body of vehicle, and voltage U2 produces a partial pressure U2P on resistance R3, is injected on hardware
Voltage U1 and voltage U2 is known fixed voltage, then when voltage U1 and voltage U2 opening a way under a proportional relationship on resistance R3
Partial pressure balance out, calculate high-tension battery group integrally to the insulaion resistance Rx of car body.
The detection method of the electric automobile car body Insulation Inspection System described in the embodiment of the present invention is as shown in Figure 2：Insulation inspection
Examining system obtains power supply from the vehicle low pressure accessory power supply of electric automobile, through power protecting circuit to power isolation circuit and absolutely
Edge detecting system is protected, and suitable supply voltage is entered after the isolated from power of line transformer to whole Insulation Inspection System institute
There is module to be powered；After electricity on total system, MCU micro-control unit controls injecting voltage circuits carry out voltage injection,
After detection voltage injection circuit feeds back successfully Injection Signal to MCU micro-control units, now resistance measuring circuit starts to detect car
Integral insulation resistance Rx of the high-tension battery group positive and negative busbar of body high-pressure side to car body；Insulation resistance value and insulation fault grade are led to
The CAN communication system that CAN is delivered to vehicle is crossed, while indicating insulation fault level circuitry and LED to refer to switching value or PWM
Show that running status circuit indicates the running status of Insulation Inspection System.
As shown in figure 3, the electric automobile car body Insulation Inspection System described in the present embodiment, high-tension battery group is connected in parallel electricity
Resistance Rp and resistance Rn, the insulation composite measurement value of both resistance Rp and resistance Rn is reported to host computer or vehicle.
It is on earth positive and negative mother that the insulaion resistance Rx of the measurement result of electric automobile car body Insulation Inspection System not can indicate that
Which side is more severe to car body electric leakage for line, so also needing to further measurement.Fig. 4 is obtained after Fig. 3 is simplified, as shown in figure 4,
Resistance Rp, resistance Rn and resistance R1, resistance R2, resistance R3 composition Wheatstone bridges, resistance R1 are equal with the resistance of resistance R2, resistance
No current flows through on resistance R3 when Rp is equal with the resistance of resistance Rn, resistance Rp<Electric current during resistance Rn on resistance R3 is from dextrad
Left flowing, produces a positive voltage, resistance Rp on resistance R3>Electric current during resistance Rn on resistance R3 flows from left to right, resistance
A negative voltage is produced on R3, the positive and negative busbar of vehicle can be gone out to car body which side leakage current more with comprehensive assessment using this phenomenon
Greatly, the Position Approximate of defective insulation can be conveniently positioned herein.
Electric automobile car body Insulation Inspection System, its power protecting circuit includes that power input reverse-connection preventing circuit, power supply are defeated
Enter anti-surge circuit, overvoltage crowbar.As shown in Figure 1 and Figure 5, because the power supply of electric automobile car body Insulation Inspection System is
Powered from the low pressure accessory power supply of vehicle, so having done very many Redundancy Designs in terms of power protection：Power input counnter attack
Connecing circuit can prevent the reverse power connection of below 100V, and subsequent conditioning circuit does not power to reach the whole insulation inspection of protection after reverse power connection
Examining system；Power input anti-surge circuit can prevent the surge voltage of 123V/100ms, insulate during this surge and later
Detecting system all normal works；The instant power-down of power input continues whole system work, and this circuit is using energy storage component
Energy storage is carried out at power input, when the unexpected power down of low-tension supply to 0V for a period of time after low-tension supply normal power supply, this section falls
The electric time no more than 200mS this Insulation Inspection System just can during power down normal work always；Insulating power supply circuit, by
It is that direct power supply from low-tension supply be finally to high pressure system in the electric automobile car body Insulation Inspection System described in the present embodiment
System carries out voltage injection, so electrical isolation is carried out in high and low pressure system direct requirement, can be real by this insulating power supply circuit
The high-low pressure isolation of existing 1500V, prevents interference of the high pressure to low pressure.Design more than enhances the electricity described in the present embodiment
The ability of electrical automobile car body Insulation Inspection System stabilization continuous firing under some power supply harsh conditions, it is ensured that total system
Stability.
As shown in figure 1, the electric automobile car body Insulation Inspection System described in the present embodiment, its detection voltage injection feedback electricity
Whether road can normally be injected with feedback voltage injection, while can also detect whether the magnitude of voltage of injecting voltage U1 and U2 is correct.
The feedback information of software correlation computations this circuits can carry out product self-inspection and the product facility fault level of Insulation Inspection System
Judge.Ensure that Insulation Inspection System is in itself normal condition carrying out Insulation monitoring, and then ensure that measurement result is true and reliable
's.
As shown in figure 1, the electric automobile car body Insulation Inspection System described in the present embodiment possesses and various is externally indicated
Mode, it mainly has following several：
1st, selectable PWM or switch amount instruction insulation fault grade, external equipment can understand Insulation monitoring by this interface
The testing result of system；
2nd, system running state and testing result are indicated using the indicator lamp of human eye observable, directly observation refers to facilitate maintainer
Show the flashing times of lamp it is known that insulating detection equipment running status and insulation fault grade, in the feelings without computer host computer
Can also be overhauled under condition；
3rd, whole Insulation Inspection System is communicated with vehicle by CAN interface, must will can substantially be believed by CAN interface
Breath feeds back to vehicle or all bottom-up informations is uploaded into computer host computer.
All necessary information transmissions can substantially be set to other using these three flexible instructions and communication mode
Standby or maintenance person, the further reinforcement external world interacts with the system.
Storage chip is provided with electric automobile car body Insulation Inspection System described in the present embodiment, can be specific to some
Information stored, the information following points of main storage：
1st, electric number of times on Insulation Inspection System is stored, the number of times of convenient statistics Insulation Inspection System stable operation；
2nd, the equipment fault to Insulation Inspection System itself is stored, herein mainly in conjunction with upper electric number of run, for steady
Determine run time and number of times is counted, the fault message for final equipment carries out specific aim analysis, the equipment for facilitating the later stage
The tracking of fault rate and return the maintenance after factory；
3rd, stored for insulation fault information with reference to upper electric number of times, the insulation fault frequency for the vehicle section time is carried out
Statistics；This information can feed back to vehicle factory, and convenient positioning insulation fault is that external factor causes or due to vehicle operation
It is aging to cause.
The analysis of information Store and correlation more than can follow the trail of a part and anomaly statistics become very simple,
This not only human-saving, while the insulation situation characteristic that can also be directed to somewhere is tracked.
The conjugation of electric automobile car body Insulation Inspection System and detection method described in the present embodiment in software and hardware
On just done special optimization, not only the insulation measurement response time can be changed by host computer, while can also basis
The special function of customizing software and directly write with a brush dipped in Chinese ink new software with CAN without tearing shell open of client.
As shown in fig. 6, the vehicle low pressure of electric automobile car body Insulation Inspection System described in the present embodiment from electric automobile
Power supply is obtained at accessory power supply, power isolation circuit and Insulation Inspection System are protected through power protecting circuit, will be suitable
Supply voltage enter the isolated from power of line transformer after be powered to all modules of whole Insulation Inspection System；In total system
After upper electricity, MCU micro-control unit controls injecting voltage circuits carry out voltage injection, are fed back in detection voltage injection circuit and successfully noted
After entering signal to MCU micro-control units, now resistance measuring circuit starts to detect the positive and negative mother of high-tension battery group of car body high-pressure side
Integral insulation resistance Rx of the line to car body；Insulation resistance value and insulation fault grade are led to by the CAN that CAN is delivered to vehicle
News system, while indicating insulation fault level circuitry and LED to indicate running status circuit to indicate Insulation monitoring with switching value or PWM
The running status of system.Electric automobile car body Insulation Inspection System described in the present embodiment is reducing injecting voltage and electric current
On the basis of, the high accuracy of measurement insulaion resistance is also retains, while place's positive and negative busbar which side insulation to car body can also be assessed
Resistance value is smaller.Because the power supply of Insulation Inspection System of the invention is at low pressure accessory power supply, so at power input
Carried out anti-reverse, Anti-surging, power down maintenance work for a period of time with the circuit of insulating power supply, this electric automobile is reached with this
The purpose of body Insulation Inspection System stabilization trouble free service.Seen by the necessary information of CAN interface and host computer communication realizing system
Examine, can not only observe herein product self-inspection whether complete, equipment with the presence or absence of failure, insulation fault grade, measurement gained absolutely
Edge resistance value, can also read electric number of times on the history insulation fault of storage, Insulation Inspection System carries out the analysis of some data.
Strengthen man-machine interaction using indicator lamp, it is convenient directly can also to be instructed absolutely by reading LED status in no computer
The running status and insulation fault grade of edge detecting system.
Embodiment 2
In conjunction with the embodiments 1, as a example by once going up electro-detection insulaion resistance and find insulation fault, to electric automobile of the invention
Body Insulation Inspection System and detection method are further illustrated.
As shown in fig. 7, electric automobile car body Insulation Inspection System is loaded onto on an actual vehicle, while in high-tension battery
For the high pressure positive bus-bar of 600V connects a 20M Ω resistance to car body, a 330K Ω resistance is connect to car body in high pressure negative busbar.Then
By the low-tension supply master switch of vehicle, be commonly called as " big lock " to closure on, now low-tension supply vehicle to Insulation Inspection System just
Often power supply.Insulation Inspection System starts normal work, while upper electric number of times adds 1 and is stored in Insulation Inspection System storage inside.
Start to injecting voltage on car body after electricity on electric automobile car body Insulation Inspection System, if now detection injection electricity
If pressure feedback is normally and detection injecting voltage is normal, then product self-inspection passes through.After Insulation Inspection System itself is without equipment fault
Start to be normally carried out insulaion resistance detection.Because insulation resistance value is very high when vehicle insulation is good, but before in positive and negative mother
Line resistance in parallel to car body, so now positive and negative busbar has just been pulled to the scope of resistance in parallel to the insulaion resistance of car body,
I.e. positive bus-bar to car body insulaion resistance 20M Ω, negative busbar to car body insulaion resistance 330K Ω.Obtained by Insulation Inspection System measurement
Insulating resistance value is 330 K Ω ± 10% errors, and now Insulation monitoring result is " one-level insulation fault ".Now Insulation monitoring system
System meeting just " equipment fault-free " and " one-level insulation fault " are stored in internal system storage, indicator lamp and start according to the display for setting
Mode flashes instruction running status, PWM and exports specific pulsewidth instruction insulation fault.Measurement result is passed by CAN interface simultaneously
To vehicle, if computer is mounted with that more bottom hardware information to host computer can be uploaded if host computer.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that and the foregoing is only specific embodiment of the invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc. all should include
Within protection scope of the present invention.
Claims (7)
1. a kind of electric automobile car body Insulation Inspection System, including power protecting circuit, MCU micro-control units, the power supply are protected
One end connecting electric automobile vehicle low pressure accessory power supply of protection circuit is obtaining low-power injecting voltage, the power protecting circuit
The other end connection MCU micro-control units, it is characterised in that：The electric automobile car body Insulation Inspection System also include power supply every
From circuit, voltage injection circuit, storage inside circuit, detection voltage injection feedback circuit, resistance measuring circuit, CAN, instruction fortune
Row status circuit, switching value or PWM indicate insulation fault level circuitry；
The power protecting circuit connecting electric automobile vehicle low pressure accessory power supply, from low pressure accessory power supply to electric automobile
Body Insulation Inspection System is powered；
Power isolation circuit is provided between the power protecting circuit and MCU micro-control units, the power isolation circuit is used
Carry out directly carrying out electrical isolation in high and low pressure system when voltage injects in high-pressure system, prevent interference of the high pressure to low pressure；
The MCU micro-control units indicated with CAN, storage inside circuit, switching value or PWM respectively insulation fault level circuitry,
Running status circuit, detection voltage injection feedback circuit is indicated to be connected；The CAN is communicated for vehicle, and bottom is refreshed by CAN
Layer program, the interface of CAN communicates with host computer and realizes information observation and data analysis；The storage inside circuit is used for equipment event
Barrier information and vehicle Abnormal Insulation information are stored jointly；Whether the detection voltage injection feedback circuit is used for detecting feedback voltage
Whether normal injection and detection injecting voltage value are correct, and the feedback information of detection voltage injection feedback circuit is used to carry out insulation inspection
The product self-inspection of examining system and product facility fault level judge；The switching value or PWM indicate insulation fault level circuitry to use
Insulation fault grade is indicated to indicate in switching value or PWM, switching value or PWM indicate insulation fault level circuitry to connect external setting
Standby, external equipment indicates insulation fault level circuitry to obtain the testing result of Insulation Inspection System by switching value or PWM；It is described
Indicating running status circuit is used for indicator lamp instruction equipment running status.
2. electric automobile car body Insulation Inspection System as claimed in claim 1, it is characterised in that：The power protecting circuit bag
Include power input reverse-connection preventing circuit, power input anti-surge circuit, overvoltage crowbar；The power input reverse-connection preventing circuit is used
In the reversal connection for preventing below 100V power supplys, to the guarantor of whole Insulation Inspection System when not powered for subsequent conditioning circuit after reverse power connection
Shield；The power input anti-surge circuit is used to prevent the surge voltage of 123V/100ms, for protecting Insulation Inspection System to exist
During surge and later normal work；The overvoltage crowbar is used for whole Insulation monitoring during the instant power-down of power input
System works on, whole Insulation Inspection System maintenance work 200mS after being opened a way for power supply.
3. electric automobile car body Insulation Inspection System as claimed in claim 1 or 2, it is characterised in that：The electric automobile
Body Insulation Inspection System connection body high-pressure side；Car body high-pressure side includes high-tension battery group, resistance R1, resistance R2, resistance R3, electricity
Rx is hindered, the resistance R1, resistance R2 are connected in parallel in high-tension battery group two ends and are connected with resistance measuring circuit, the resistance Rx
Connect high-tension battery group and in parallel with resistance R3 in parallel with voltage injection circuit, detection voltage injection feedback circuit again, the resistance
Measuring circuit, voltage injection circuit, detection voltage injection feedback circuit connect MCU micro-control units respectively；The electric automobile
The MCU micro-control units of car body Insulation Inspection System are by voltage injection circuit to injecting voltage U1, voltage on the car body of vehicle
U1 by after insulaion resistance Rx and resistance R1, resistance R2 on resistance R3 produce a voltage U1P, exhausted in Insulation Inspection System
Edge resistance Rx produces partial pressure when opening a way at resistance R3, and the voltage of voltage U1P is two results of voltage superposition, in MCU micro-controls
Control voltage injection circuit injects a voltage U2 to unit processed to the car body of vehicle again, and voltage U2 produces one on resistance R3
Partial pressure U2P, the voltage U1 injected on hardware and voltage U2 are known fixed voltage, then under a proportional relationship by voltage U1 and
Partial pressure during voltage U2 open circuits on resistance R3 is balanced out, and calculates high-tension battery group integrally to the insulaion resistance Rx of car body.
4. electric automobile car body Insulation Inspection System as claimed in claim 3, it is characterised in that：The high-tension battery group is in parallel
Connection resistance Rp and resistance Rn, the composite measurement value of both resistance Rp and resistance Rn is reported to host computer or vehicle.
5. electric automobile car body Insulation Inspection System as claimed in claim 3, it is characterised in that：The electric automobile car body is exhausted
The insulaion resistance Rx of the measurement result of edge detecting system is further measured, resistance Rp, resistance Rn and resistance R1, resistance R2, resistance
R3 constitutes Wheatstone bridge, and resistance R1 is equal with the resistance of resistance R2, nothing on resistance R3 when resistance Rp is equal with the resistance of resistance Rn
Electric current flows through, resistance Rp<Electric current during resistance Rn on resistance R3 is flowed from right to left, and a positive voltage, electricity are produced on resistance R3
Resistance Rp>Electric current during resistance Rn on resistance R3 is flowed from left to right, and a negative voltage is produced on resistance R3, whole with this comprehensive assessment
Which side leakage current is bigger to car body for the positive and negative busbar of car, positioning defective insulation position.
6. electric automobile car body Insulation Inspection System as claimed in claim 1, it is characterised in that：The electric automobile car body is exhausted
Edge detecting system also includes storage chip, and the storage chip connects MCU micro-control units, and the storage chip is used for equipment
Electric number of times statistics, device fault information and vehicle Abnormal Insulation information are stored jointly.
7. a kind of electric automobile car body insulation detecting method, including the electric automobile as any one of claim 1 to 6
Body Insulation Inspection System, it is characterised in that：
The Insulation Inspection System obtains power supply from the vehicle low pressure accessory power supply of electric automobile, through power protecting circuit to electricity
Source isolation circuit and Insulation Inspection System are protected, and suitable supply voltage are entered after the isolated from power of line transformer to whole
The all modules of Insulation Inspection System are powered；
After electricity on total system, MCU micro-control unit controls injecting voltage circuits carry out voltage injection, in detection voltage injection
After electronic feedback success Injection Signal to MCU micro-control units, now resistance measuring circuit starts to detect the height of car body high-pressure side
Integral insulation resistance Rx of the piezoelectric battery group positive and negative busbar to car body；
Insulation resistance value and insulation fault grade are delivered to the CAN communication system of vehicle by CAN, at the same with switching value or
PWM indicates insulation fault level circuitry and indicates running status circuit to indicate the running status of Insulation Inspection System.
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