CN108957135A - A kind of electric automobile insulation resistance on-line measurement system and its method - Google Patents
A kind of electric automobile insulation resistance on-line measurement system and its method Download PDFInfo
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- CN108957135A CN108957135A CN201810667882.5A CN201810667882A CN108957135A CN 108957135 A CN108957135 A CN 108957135A CN 201810667882 A CN201810667882 A CN 201810667882A CN 108957135 A CN108957135 A CN 108957135A
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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
Abstract
The present invention provides a kind of electric automobile insulation resistance on-line measurement system and its method, its measuring system includes two-way measuring circuit, two-way voltage injection circuit and cpu controller, the two-way measuring circuit includes the positive test side connecting with automobile anode insulation resistance and the cathode test side that connect with automobile negative insulation resistance, the present invention detects insulation resistance by injecting double DC voltages, and there is no mechanically or electrically sub switchs so failure rate；Due to using signal injection method solve the problems, such as positive and negative anodes insulation resistance simultaneously reduce it is immeasurable, while use signal injection method also solve the problems, such as that no busbar voltage is not capable of measuring insulation resistance；Additionally, due to injection be DC low-voltage signal rather than AC signal will not influence direct current system ripple, also do not influenced by the distribution capacity of system, have many advantages, such as that applied widely, performance is stable, strong antijamming capability, measurement accuracy are high.
Description
Technical field
The present invention relates to the measuring systems of electric vehicle on-line measurement insulation resistance, more specifically refer to a kind of electric car
Insulation resistance on-line measurement system and its method.
Background technique
Electric car is grown rapidly under the support energetically of national policy.Electric car is a complicated electromechanics one
Body product, many of these components include power battery, motor, charger, energy recycle device, boosting battery charging unit
It is usually run under high-power and high voltage, huge challenge is proposed to insulation resistance detection.There are many sides for insulating monitoring technology
Formula, but all there are some disadvantages, if relay test mode sensitivity is low, balanced bridge method is when positive and negative anodes insulate while reducing
It cannot accurately and timely alarm, injection AC signal method can not only be such that direct current system ripple increases, and influence power supply quality, and system
Distribution capacity will have a direct impact on measurement result, resolution ratio is low.Unlike the monitoring of electric system D.C. isolation, electric car
Direct current system voltage class covers the wide scope of 90~500V, and voltage frequently changes in operational process, for precision, safety
Property, reliability and durability requirement all with higher.
Summary of the invention
The main purpose of the present invention is to provide a kind of electric automobile insulation resistance on-line measurement system and its method, this hairs
Bright combination bridge method and signal injection method propose the insulation resistance detection method that double DC voltages are injected in electric bridge, and machine is not present
The case where tool or electronic switch reduce failure rate, can also measure positive and negative anodes insulation while reduce, injection DC low-voltage will not
Direct current system ripple is influenced, is not also influenced by the distribution capacity of system, with applied widely, performance is stable, anti-interference ability
By force, the advantages that measurement accuracy is high.
Another object of the present invention is to the present invention to solve the problems, such as insulation resistance on-line real time monitoring, drop to insulation resistance
It is low to make alarm in advance, avoid dangerous situation；The advantages of present invention stablizes with performance, strong antijamming capability, meets vehicle
Vibration and protection requirement, adapt to the needs of harsh environments.
This patent scope of application are as follows: new-energy automobile and other industries for needing to monitor insulation resistance.
The shortcomings that for the above-mentioned prior art,
The technical solution adopted by the present invention are as follows: a kind of electric automobile insulation resistance on-line measurement system, including two-way measuring circuit
(10), two-way voltage injection circuit (20) and cpu controller (30), the two-way measuring circuit (10) include exhausted with automobile anode
The positive test side (Up) of edge resistance (Rp) connection and the cathode test side (Un) being connect with automobile negative insulation resistance (Rn),
The dual path injection circuit (20) includes first resistor (R1), second resistance (R2) and controlled voltage source (V), wherein first electricity
Resistance (R1) and second resistance (R1) be connected in series after access between the anode test side (Up) and the cathode test side (Un), this by
Control the one end voltage source (V) be connected between the automobile anode insulation resistance (Rp) and automobile negative insulation resistance (Rn) and with the vapour
Chassis (D) connection, controlled voltage source (V) other end be connected between the first resistor (R1) and second resistance (R1) and with
Ground terminal (GND) connection, the cpu controller for control controlled voltage source (V) be injected separately into two low-voltage dc voltages and
For detect injection low-voltage dc voltage after the anode test side (Up), cathode test side (Un) voltage value.
When injecting voltage value is U1, the voltage value which detects is Up1, the cathode test side
(Un) voltage value detected is Un1, and when injecting voltage value is U2, the voltage value which detects is
The voltage value that Up2, the cathode test side (Un) detect is Un2, by applying Kirchhoff's second law and electricity in circuit
Law is flowed, automobile anode insulation resistance resistance value Rp is calculated separately out by known U1, U2, Up1, Un1, Up2, Un2, R1, R2
With automobile negative insulation resistance Rn.
A kind of measurement method of electric automobile insulation resistance on-line measurement system, comprising the following steps:
It is injected Step 1: controlling controlled voltage source by cpu controller toward automobile anode insulation resistance, automobile negative insulation resistance
One low-voltage dc voltage, when the voltage value of injection is U1, measurement at this time obtains the voltage value Up1 of positive test side, measurement
The voltage value for obtaining cathode test side is Un1；
It is injected Step 2: controlling controlled voltage source by cpu controller toward automobile anode insulation resistance, automobile negative insulation resistance
Another low-voltage dc voltage, when the voltage value of injection is U2, measurement at this time obtains the voltage value Up2 of positive test side, surveys
The voltage value that amount obtains cathode test side is Un2；
Automobile anode insulation resistance resistance value Rp and automobile negative insulation electricity are obtained Step 3: calculating by Up1, Un1, Up2, Un2
Hinder resistance value Rn；
Step 4: whether the resistance value of Rp and Rn in judgment step three are greater than 500 Ω/V；
Step 5: after the resistance value of Rp and Rn in judgment step three are greater than 500 Ω/V, then passing through output CAN letter such as step 4
Number report state it is normal；
Step 6: such as step 4, after the resistance value of Rp and Rn in judgment step four are less than 500 Ω/V, then judge again Rp with
After whether the resistance value of Rn is greater than 300 Ω/V, as the resistance value of Rp and Rn be greater than 300 Ω/V and less than 500 Ω/V if there are three-level therefore
Barrier, then exports three-level fault alarm signal and there are the states of three-level fault by the report of output CAN signal；
Step 7: as step 6 then judges the resistance value of Rp and Rn after the resistance value for judging Rp and Rn is less than 300 Ω/V again
Whether be greater than 100 Ω/V after, as the resistance value of Rp and Rn be greater than 100 Ω/V and less than 300 Ω/V if there are secondary failures, it is then defeated
Out secondary failure alarm signal and by output CAN signal report there are the states of secondary failure；
Step 8: as then there is level fault, then exporting one in step 7 after judging the resistance value of Rp and Rn less than 100 Ω/V
Grade alarm signal and by export CAD signal reports there are the states of secondary failure.
The invention has the benefit that the present invention is by automobile anode insulation resistance Rp, negative insulation resistance Rn and the present invention
Internal standard resistance R1, R2 of system form electric bridge；Controlled voltage source is added in electric bridge, voltage source point is controlled by CPU
Not Zhu Ru low-voltage dc voltage U1, U2, while the CPU detection end Up and Un voltage to four voltage values Up1, Un1, Up2, Un2.
To the circuit application Kirchhoff's second law and current law, by U1, U2, Up1, Un1, Up2, Un2, R1, R2 these
Know that condition can find out positive insulation resistance Rp and negative insulation resistance Rn respectively.
The present invention detects insulation resistance by injecting double DC voltages, and there is no mechanically or electrically sub switchs so failure
Rate；Reduce due to solving the problems, such as positive and negative anodes insulation resistance simultaneously using signal injection method it is immeasurable, while using signal
Injection method also solves the problems, such as that no busbar voltage is not capable of measuring insulation resistance；What it is additionally, due to injection is DC low-voltage signal
Rather than AC signal will not influence direct current system ripple, also not influenced by the distribution capacity of system, have applied widely, performance
The advantages that stabilization, strong antijamming capability, high measurement accuracy.
Detailed description of the invention
Fig. 1 is measuring system circuit diagram of the invention.
Fig. 2 is the functional-block diagram of measuring system of the invention.
Fig. 3 is the flow diagram of measurement method of the invention.
Specific embodiment
It is as shown in Figure 1 to Figure 3 a kind of preferable specific embodiment of the invention, a kind of electric automobile insulation resistance exists
Line measuring system, it is described as shown in Figure 1, Figure 2, including two-way measuring circuit (10), two-way voltage injection circuit (20) and CPU control
Device (30), the two-way measuring circuit (10) include the positive test side (Up) being connect with automobile anode insulation resistance (Rp) and with
Automobile negative insulation resistance (Rn) connection cathode test side (Un), the dual path injection circuit (20) include first resistor (R1),
Second resistance (R2) and controlled voltage source (V), wherein the first resistor (R1) accesses after being connected in series with second resistance (R1)
Between the anode test side (Up) and the cathode test side (Un), which is connected to automobile anode absolutely
It is connect between edge resistance (Rp) and automobile negative insulation resistance (Rn) and with the automobile chassis (D), the controlled voltage source (V) is another
End is connected between the first resistor (R1) and second resistance (R1) and connect with ground terminal (GND), and the cpu controller is for controlling
Controlled voltage source (V) processed is injected separately into two low-voltage dc voltages and examines for the anode after detecting injection low-voltage dc voltage
Survey the voltage value of end (Up), cathode test side (Un).
When injecting voltage value is U1, the voltage value which detects is Up1, the cathode test side
(Un) voltage value detected is Un1, and when injecting voltage value is U2, the voltage value which detects is
The voltage value that Up2, the cathode test side (Un) detect is Un2, by applying Kirchhoff's second law and electricity in circuit
Law is flowed, asks (calculating) to go out the resistance of automobile anode insulation resistance respectively by known U1, U2, Up1, Un1, Up2, Un2, R1, R2
Value Rp and automobile negative insulation resistance Rn.
Warning circuit (40) that above-mentioned electric automobile insulation resistance on-line measurement system is also connect with the cpu controller and
The work (50) of voltage is provided for the work of entire circuit.
The measurement method of above-mentioned electric automobile insulation resistance on-line measurement system, includes the following steps as shown in Figure 3
It is injected Step 1: controlling controlled voltage source by cpu controller toward automobile anode insulation resistance, automobile negative insulation resistance
One low-voltage dc voltage, when the voltage value of injection is U1, measurement at this time obtains the voltage value Up1 of positive test side, measurement
The voltage value for obtaining cathode test side is Un1；
It is injected Step 2: controlling controlled voltage source by cpu controller toward automobile anode insulation resistance, automobile negative insulation resistance
Another low-voltage dc voltage, when the voltage value of injection is U2, measurement at this time obtains the voltage value Up2 of positive test side, surveys
The voltage value that amount obtains cathode test side is Un2；
Automobile anode insulation resistance resistance value Rp and automobile negative insulation electricity are obtained Step 3: calculating by Up1, Un1, Up2, Un2
Hinder resistance value Rn；
Step 4: whether the resistance value of Rp and Rn in judgment step three are greater than 500 Ω/V；
Step 5: after the resistance value of Rp and Rn in judgment step three are greater than 500 Ω/V, then passing through output CAN letter such as step 4
Number report state it is normal.
Step 6: as step 4 then judges again after the resistance value of Rp and Rn in judgment step four are less than 500 Ω/V
After whether the resistance value of Rp and Rn is greater than 300 Ω/V, as the resistance value of Rp and Rn be greater than 300 Ω/V and less than 500 Ω/V if there are three
Grade failure, then exports three-level fault alarm signal and there are the states of three-level fault by the report of output CAN signal；
Step 7: as step 6 then judges the resistance value of Rp and Rn after the resistance value for judging Rp and Rn is less than 300 Ω/V again
Whether be greater than 100 Ω/V after, as the resistance value of Rp and Rn be greater than 100 Ω/V and less than 300 Ω/V if there are secondary failures, it is then defeated
Out secondary failure alarm signal and by output CAN signal report there are the states of secondary failure；
Step 8: as then there is level fault, then exporting one in step 7 after judging the resistance value of Rp and Rn less than 100 Ω/V
Grade alarm signal and by export CAD signal reports there are the states of secondary failure.
This hair technical solution by automobile anode insulation resistance Rp, negative insulation resistance Rn and present system internal standard
Resistance R1, R2 form electric bridge；Controlled voltage source is added in electric bridge, voltage source is controlled by CPU and is injected separately into low-voltage direct
Voltage U1, U2, at the same the CPU detection end Up and Un voltage to four voltage values Up1, Un1, Up2, Un2.To the circuit application base
That Hough voltage law and current law, by U1, U2, Up1, Un1, Up2, Un2, R1, R2, these known conditions can divide
Positive insulation resistance Rp and negative insulation resistance Rn are not found out.
The present invention detects insulation resistance by injecting double DC voltages, and there is no mechanically or electrically sub switchs so failure
Rate；Reduce due to solving the problems, such as positive and negative anodes insulation resistance simultaneously using signal injection method it is immeasurable, while using signal
Injection method also solves the problems, such as that no busbar voltage is not capable of measuring insulation resistance；What it is additionally, due to injection is DC low-voltage signal
Rather than AC signal will not influence direct current system ripple, also not influenced by the distribution capacity of system, have applied widely, performance
The advantages that stabilization, strong antijamming capability, high measurement accuracy.
The embodiment of the present invention and attached drawing are intended merely to show design concept of the invention, and protection scope of the present invention is not
It should be confined to this embodiment.
It can be seen from the above description that purpose of design of the invention can effectively be implemented.The part exhibition of embodiment
The purpose of the present invention is shown and has implemented function and structure theme, and including other equivalent replacements.
Therefore, the claims of the present invention include other equivalent implementations, and the specific scope of claims are incorporated herein by reference.
Claims (3)
1. a kind of electric automobile insulation resistance on-line measurement system, it is characterised in that: including two-way measuring circuit (10), two-way electricity
Pressure injection circuit (20) and cpu controller (30), the two-way measuring circuit (10) include and automobile anode insulation resistance (Rp)
The positive test side (Up) of connection and the cathode test side (Un) being connect with automobile negative insulation resistance (Rn), the dual path injection
Circuit (20) includes first resistor (R1), second resistance (R2) and controlled voltage source (V), wherein the first resistor (R1) and the
Two resistance (R1) access between the anode test side (Up) and the cathode test side (Un) after being connected in series, the controlled voltage source
(V) one end be connected between the automobile anode insulation resistance (Rp) and automobile negative insulation resistance (Rn) and with the automobile chassis
(D) it connects, which is connected between the first resistor (R1) and second resistance (R1) and and ground terminal
(GND) it connects, which is injected separately into two low-voltage dc voltages and for examining for controlling controlled voltage source (V)
Survey the voltage value of the anode test side (Up) after injecting low-voltage dc voltage, cathode test side (Un).
2. a kind of electric automobile insulation resistance on-line measurement system as described in claim 1, which is characterized in that work as injecting voltage
When value is U1, voltage value which detects is Up1, the cathode test side (Un) detects voltage value
For Un1, when injecting voltage value is U2, the voltage value which detects is Up2, the cathode test side
(Un) voltage value detected is Un2, by applying Kirchhoff's second law and current law in circuit, by known
U1, U2, Up1, Un1, Up2, Un2, R1, R2 calculate separately out automobile anode insulation resistance resistance value Rp and automobile negative insulation resistance
Resistance value Rn.
3. a kind of measurement method of electric automobile insulation resistance on-line measurement system, it is characterised in that: the following steps are included:
It is injected Step 1: controlling controlled voltage source by cpu controller toward automobile anode insulation resistance, automobile negative insulation resistance
One low-voltage dc voltage, when the voltage value of injection is U1, measurement at this time obtains the voltage value Up1 of positive test side, measurement
The voltage value for obtaining cathode test side is Un1；
It is injected Step 2: controlling controlled voltage source by cpu controller toward automobile anode insulation resistance, automobile negative insulation resistance
Another low-voltage dc voltage, when the voltage value of injection is U2, measurement at this time obtains the voltage value Up2 of positive test side, surveys
The voltage value that amount obtains cathode test side is Un2；
Automobile anode insulation resistance resistance value Rp and automobile negative insulation electricity are obtained Step 3: calculating by Up1, Un1, Up2, Un2
Hinder resistance value Rn；
Step 4: whether the resistance value of Rp and Rn in judgment step three are greater than 500 Ω/V；
Step 5: after the resistance value of Rp and Rn in judgment step three are greater than 500 Ω/V, then passing through output CAN letter such as step 4
Number report state it is normal；
Step 6: such as step 4, after the resistance value of Rp and Rn in judgment step four are less than 500 Ω/V, then judge again Rp with
After whether the resistance value of Rn is greater than 300 Ω/V, as the resistance value of Rp and Rn be greater than 300 Ω/V and less than 500 Ω/V if there are three-level therefore
Barrier, then exports three-level fault alarm signal and there are the states of three-level fault by the report of output CAN signal；
Step 7: as step 6 then judges the resistance value of Rp and Rn after the resistance value for judging Rp and Rn is less than 300 Ω/V again
Whether be greater than 100 Ω/V after, as the resistance value of Rp and Rn be greater than 100 Ω/V and less than 300 Ω/V if there are secondary failures, it is then defeated
Out secondary failure alarm signal and by output CAN signal report there are the states of secondary failure；
Step 8: as then there is level fault, then exporting one in step 7 after judging the resistance value of Rp and Rn less than 100 Ω/V
Grade alarm signal and by export CAD signal reports there are the states of secondary failure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810667882.5A CN108957135B (en) | 2018-06-26 | 2018-06-26 | Online measuring system and method for insulation resistance of electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810667882.5A CN108957135B (en) | 2018-06-26 | 2018-06-26 | Online measuring system and method for insulation resistance of electric automobile |
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| CN108957135B CN108957135B (en) | 2022-01-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109596888A (en) * | 2018-12-17 | 2019-04-09 | 深圳市超思维电子股份有限公司 | Insulation resistance detection method, detection circuit and the battery management system of automobile batteries |
| CN109856459A (en) * | 2019-02-03 | 2019-06-07 | 北京长城华冠汽车科技股份有限公司 | A kind of electric automobile insulation electric resistance measuring apparatus and method and warning device |
| CN110426557A (en) * | 2019-08-14 | 2019-11-08 | 江苏云意电气股份有限公司 | A kind of IGBT drive circuit and detection method of integrated Insulation monitoring |
| CN113030575A (en) * | 2021-03-11 | 2021-06-25 | 福建星云电子股份有限公司 | Insulation detection method |
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Address after: 510000 workshop A1, A2 and A3, No. 9, Weisi Road, Zengjiang street, Zengcheng, Guangzhou, Guangdong Province Patentee after: Shunke Zhilian Technology Co.,Ltd. Address before: 510000 workshop A1, A2 and A3, No. 9, Weisi Road, Zengjiang street, Zengcheng, Guangzhou, Guangdong Province Patentee before: SANCO NEW ENERGY TECHNOLOGY Co.,Ltd. |
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