CN102426326A - Detection method of electric automobile insulating performance - Google Patents
Detection method of electric automobile insulating performance Download PDFInfo
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- CN102426326A CN102426326A CN2011102640507A CN201110264050A CN102426326A CN 102426326 A CN102426326 A CN 102426326A CN 2011102640507 A CN2011102640507 A CN 2011102640507A CN 201110264050 A CN201110264050 A CN 201110264050A CN 102426326 A CN102426326 A CN 102426326A
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Abstract
The invention relates to a detection method of electric automobile insulating performance. According to the method, a relay 1 and a relay 2 are employed to connect with an anode and a cathode of a direct current bus respectively, voltage division resistors R1 and R1' are in series connection between the relay 1 and a ground (i.e. automobile body), voltage division resistors R2 and R2' are in series connection between the relay 2 and the ground, direct current source 1 injects a direct current signal to a circuit through a diode d1 and a resistor R3, and a direct current source 2 injects a direct current signal to the circuit through a diode D2 and a resistor R4. Four voltage sampling circuits are provided on the R1', R2', R3 and R4 resistors respectively. Through combining the above circuit with specific sampling and calculating steps, insulating performance detection is realized. According to the invention, a method of injecting direct current by a power source is employed to carry out detection, detection precision is high, resistance of the voltage division resistors can be selected to be a large value, influence on vehicle insulating performance in measurement is small, and normal working of an original vehicle system is not interfered.
Description
Technical field
The present invention relates to the electric vehicle engineering field, specifically be meant a kind of detection method of electric automobile insulating property.
Background technology
From the consideration to the energy and environment, electric automobile obtains fast development because of its energy-conserving and environment-protective.In order to reach certain electric pressure, usually the multiple batteries series connection to be used in the electric automobile, voltage range is between 300-500V.In the middle of the actual motion of electric automobile, the working environment more complicated, reasons such as the variation of vibration abrasion, temperature and humidity, liquid corrosion all can cause the decline of insulating property, jeopardize occupant's personal safety.Therefore, the insulation detection technique is the important technology that electric automobile concerns personal safety.
Present stage insulation measurement method mainly is divided into AC method and DC-method.AC method is through being injected into high frequency ac signal in the electric loop, then according to feeding back the amplitude of signal and insulation resistance is calculated in the variation of phase place.This measuring method need be injected additional ac test signals to straight-flow system, can bring certain influence to straight-flow system itself, disturbs straight-flow system work, and its complicated circuit, stable bad.DC-method is generally accomplished through the mode of measurement insulation resistance.This method thinks that vehicle dc bus both positive and negative polarity to be measured respectively has a fixing insulation resistance over the ground, and these two resistance equate under the good situation that insulate, and these two resistance are just unequal during decreasing insulating.Detect the loop in addition and between positive and negative busbar and ground, also seal in two substitutional resistances and sample circuit, when insulation resistance changed, the voltage that sampling circuit is adopted back can change, and just can release insulation resistance according to certain formula then.The shortcoming of this method is that the detection system precision prescribed is very high, and the resistance that detection system seals in can not be too big, otherwise influence measuring accuracy.Because of resistance is little, so the resistance that seals in itself has just reduced the insulating property of electric automobile.This method was surveyed to be come out yet when the positive and negative busbar insulating performance reduced simultaneously in addition.
Summary of the invention
To the problems referred to above, the present invention provides a kind of electric automobile insulating property detection method of injecting direct supply.
For addressing the above problem, the present invention takes technical scheme to be: a kind of detection method of electric automobile insulating property the steps include:
(1) look car body and be ground, electric battery dc bus positive and negative electrode insulation resistance over the ground is respectively R+ and R-;
(2) the dc bus positive terminal is connected in series relay one, direct supply one, sampling resistor R3 successively, sampling resistor R3 other end ground connection; The dc bus negative pole is connected in series relay two, direct supply two, sampling resistor R4 successively, sampling resistor R4 other end ground connection; Simultaneously, be connected in series divider resistance R1 and R1 ' between relay one and the ground, be connected in series divider resistance R2 and R2 ' between relay two and the ground;
(3) pilot relay J1 and relay J 2 closures, and direct supply one do not export with direct supply two are established assembled battery total voltage in resistance R+be respectively U+, U-with R-institute component voltage; Can converse the voltage on R+ and the R-through the voltage signal on resistance R 1 ' and the R2 ' is sampled; According to the size of R+ and the last voltage of R-, can draw the proportionate relationship formula of R+ and R-, establishing this relational expression is formula one;
(4) closed, relay J 2 disconnections of pilot relay J1 again; Direct supply one output voltage signal; Direct supply two is not exported, then the voltage of assembled battery total voltage and direct supply one output be injected into simultaneously resistance R+, the circuit loop formed of R-, R1, R1 '; If flow through resistance R+electric current for
; Flow through resistance R-electric current for
; The electric current that flows through resistance R 3 is
, flow through resistance R 1 electric current is
; Resistance R 1 ', the last voltage of R3 are sampled; According to circuit theory
+
=
+
; If this formula is a formula two, then obtain R+ according to formula two and formula one;
(5) closed, relay J 1 disconnection of pilot relay J2 again; Direct supply one is not exported; Direct supply two output voltage signals, then the voltage of assembled battery total voltage and direct supply two outputs be injected into simultaneously resistance R+, in the circuit loop that constitutes of R-, R2, R2 '; If flow through resistance R+electric current for
; Flow through resistance R-electric current for
; The electric current that flows through resistance R 2 is
; The electric current that flows through resistance R 4 is
; Voltage signal on resistance R 2 ' and the resistance R 4 is sampled; According to circuit theory can be known
+
=
+
; If this formula is a formula three, then obtain R-according to formula three and formula one.
Between direct supply one and relay one, be connected to diode D1 in the step (2), it is anodal that direct supply one meets diode D1.
Between direct supply two and relay two, be connected to diode D2 in the step (2), direct supply two connects diode D2 negative pole.
Compared with prior art, beneficial effect of the present invention is:
(1) the present invention adopts the method for injecting direct supply to detect, and accuracy of detection is high, and the divider resistance resistance can be selected greatly, and is little to the influence of vehicle insulating property during measurement, and do not disturb the operate as normal of original Vehicular system;
(2) said method can detect the positive and negative busbar resistance to earth simultaneously, has overcome additive method can't detect insulation resistance when the positive and negative busbar insulating performance descends simultaneously defective;
(3) said method connects direct supply through relay, and when not carrying out insulation measurement, testing circuit and positive and negative busbar break off, and the vehicle insulating property are had no effect.
Description of drawings
Fig. 1 is the method for the invention hardware circuit principle synoptic diagram;
Fig. 2 is that circuit relay electrical equipment J1 shown in Figure 1, J2 are closed, the equivalent circuit diagram when direct supply one, two is not exported;
Fig. 3 is that circuit relay electrical equipment J1 shown in Figure 1 is closed, J2 breaks off, direct supply one output, the equivalent circuit diagram when direct supply two is not exported;
Fig. 4 is that circuit relay electrical equipment J1 shown in Figure 1 breaks off, J2 is closed, and direct supply one is not exported, the equivalent circuit diagram when direct supply two is exported.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the present invention is done further detailed description below in conjunction with embodiment and accompanying drawing.
Like Fig. 1, the detection method of disclosed electric automobile insulating property adopts relay, divider resistance, diode, direct supply and sample circuit to cooperate specific detection step and algorithm to realize.Wherein, relay J 1 links to each other with the dc bus positive terminal, and relay J 2 links to each other with the dc bus negative pole.Seal in divider resistance R1 and R1 ' between relay J 1 and the ground, seal in divider resistance R2 and R2 ' between relay J 2 and the ground, the anodal and negative pole neutral earthing of dc bus.Direct supply 1 injects direct current signal through diode D1 and resistance R 3 to circuit, and direct supply 2 injects direct current signal through diode D2 and resistance R 4 to circuit.At resistance R 1 ', R2 ', R3, the last voltage sampling circuit that is provided with respectively of R4.Among the figure, resistance R+represent the insulation resistance of vehicle to be tested with R-.
During detection, at first pilot relay J1 and relay J 2 closures, and direct supply one is not exported with direct supply two.At this moment, assembled battery total voltage resistance R+with R-on respectively tell certain voltage, this moment Fig. 1 equivalent electrical circuit as shown in Figure 2.If establish resistance R+with R-on voltage be respectively U+, U-; Through the voltage signal on resistance R 1 ' and the R2 ' is sampled; Resistance R 1 ', R2 ', R1, R2 are all known; Then can ask the voltage between of a1 and a2 and a2 and the a3 at per 2, i.e. U+, U-, and then can draw the proportionate relationship of R+ and R-.
When need detect insulation resistance R+, then closed, relay J 2 disconnections of pilot relay J1, direct supply one output voltage signal.The voltage of this moment assembled battery total voltage and direct supply one output is injected in the circuit loop of R+, R-, R1, R1 ' formation simultaneously, and then the equivalent electrical circuit of Fig. 1 is as shown in Figure 3.If flow through resistance R+electric current for
; Flow through resistance R-electric current for
; The electric current that flows through resistance R 3 is
, flow through resistance R 1 electric current is
.Resistance R 1 ', the last voltage of R3 are sampled; Simultaneously relational expression
+
=
+
arranged, can obtain dc bus positive pole insulation resistance R+ over the ground according to the proportionate relationship of this relational expression and R+ and R-according to equivalent electrical circuit shown in Figure 3.
When need detect insulation resistance R-, then closed, relay J 1 disconnection of pilot relay J2, direct supply two output voltage signals.The voltage of this moment assembled battery total voltage and direct supply two outputs is injected in the circuit loop of R+, R-, R2, R2 ' formation simultaneously, the equivalent electrical circuit of Fig. 1 such as Fig. 4.Establish equally flow through resistance R+electric current for
; Flow through resistance R-electric current for
; The electric current that flows through resistance R 2 is
, flow through R4 electric current is
.Voltage signal on resistance R 2 ' and the resistance R 4 is sampled; Simultaneously according to Fig. 4 circuit theory has
+
=
+
, can obtain dc bus negative pole insulation resistance R-over the ground according to the proportionate relationship of this relational expression and R+ and R-.
In the test circuit, the effect of diode D1 and D2 is that electric current flows into direct supply from battery side when preventing that direct supply from not exporting.
In fact; When obtaining over the ground insulation resistance R+ of dc bus positive pole; Proportionate relationship according to R+, R-is directly to draw dc bus negative pole insulation resistance R-over the ground; But control obtains obtaining R-again behind Fig. 4 equivalent electrical circuit through foregoing circuit, can avoid calculating R+ earlier and calculate the round-off error that R-brings again.In addition, the present invention calculates over the ground insulation resistance R+ of dc bus both positive and negative polarity, the method for R-respectively, also can improve the reliability that insulation detects.If direct supply 1 damages, R+ can't directly draw, but still can extrapolate R+ again through calculating the value of R-earlier.In like manner, if direct supply 2 damages, also can extrapolate R-again through calculating R+ earlier.
Reckoning process that the present invention does not specifically introduce is those skilled in the art and can directly confirms according to circuit general knowledge, repeats no more at this.
Need to prove, more than be merely the preferable embodiment of the present invention, conceive under the prerequisite not breaking away from the present invention, any impartial the variation with modifying all belongs to protection scope of the present invention to the present invention did in the prior art scope.
Claims (1)
1. the detection method of electric automobile insulating property the steps include:
(1) look car body and be ground, electric battery dc bus positive and negative electrode insulation resistance over the ground is respectively R+ and R-;
(2) the dc bus positive terminal is connected in series relay one, direct supply one, sampling resistor R3 successively, sampling resistor R3 other end ground connection; The dc bus negative pole is connected in series relay two, direct supply two, sampling resistor R4 successively, sampling resistor R4 other end ground connection;
Be connected in series divider resistance R1 and R1 ' between relay one and the ground, be connected in series divider resistance R2 and R2 ' between relay two and the ground;
Between direct supply one and relay one, be connected to diode D1, it is anodal that direct supply one meets diode D1; Between direct supply two and relay two, be connected to diode D2, direct supply two connects diode D2 negative pole;
(3) pilot relay J1 and relay J 2 closures, and direct supply one do not export with direct supply two are established assembled battery total voltage in resistance R+be respectively U+, U-with R-institute component voltage; Through being sampled, the voltage signal on resistance R 1 ' and the R2 ' converses the voltage on R+ and the R-; According to the size of R+ and the last voltage of R-, can draw the proportionate relationship of R+ and R-, establishing this relational expression is formula one;
(4) closed, relay J 2 disconnections of pilot relay J1 again; Direct supply one output voltage signal; Direct supply two is not exported, then the voltage of assembled battery total voltage and direct supply one output be injected into simultaneously resistance R+, the circuit loop formed of R-, R1, R1 '; If flow through resistance R+electric current for
; Flow through resistance R-electric current for
; The electric current that flows through resistance R 3 is
, flow through resistance R 1 electric current is
; Resistance R 1 ', the last voltage of R3 are sampled; According to circuit theory
+
=
+
; If this formula is a formula two, then obtain R+ according to formula two and formula one;
(5) closed, relay J 1 disconnection of pilot relay J2 again; Direct supply one is not exported; Direct supply two output voltage signals, then the voltage of assembled battery total voltage and direct supply two outputs be injected into simultaneously resistance R+, in the circuit loop that constitutes of R-, R2, R2 '; If flow through resistance R+electric current for
; Flow through resistance R-electric current for
; The electric current that flows through resistance R 2 is
; The electric current that flows through resistance R 4 is
; Voltage signal on resistance R 2 ' and the resistance R 4 is sampled; According to circuit theory can be known
+
=
+
; If this formula is a formula three, then obtain R-according to formula three and formula one.
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| CN102692586A (en) * | 2012-05-31 | 2012-09-26 | 江苏奥新新能源汽车有限公司 | Insulation monitoring device and method for electric vehicle |
| CN102692591A (en) * | 2012-06-19 | 2012-09-26 | 科博达技术有限公司 | Device and method for detecting insulation failures of high and low voltage ends |
| CN102749562A (en) * | 2012-07-13 | 2012-10-24 | 安徽安凯汽车股份有限公司 | Insulation monitoring device and monitoring method of power cell of electric vehicle |
| CN102854395A (en) * | 2012-09-04 | 2013-01-02 | 阳光电源（上海）有限公司 | Circuit and method for detecting direct-current power ground insulation resistor |
| CN102928750A (en) * | 2012-10-31 | 2013-02-13 | 科博达技术有限公司 | Alternating voltage insulation failure detection device |
| CN102967766A (en) * | 2012-11-23 | 2013-03-13 | 广东易事特电源股份有限公司 | Non-switch-tube detection system and method for ground insulation resistance of dual-path photovoltaic inverter |
| CN103033729A (en) * | 2012-11-26 | 2013-04-10 | 浙江高泰昊能科技有限公司 | Insulation detection circuit and detection method used for battery box |
| CN103163379A (en) * | 2013-03-07 | 2013-06-19 | 上海电气钠硫储能技术有限公司 | Insulation resistance testing loop for sodium-sulfur battery module |
| CN103439577A (en) * | 2013-08-13 | 2013-12-11 | 重庆长安汽车股份有限公司 | Isolation resistance detection system and detection method of power battery of electric vehicle |
| CN103576064A (en) * | 2013-10-28 | 2014-02-12 | 惠州市亿能电子有限公司 | Insulation detection circuit with calibration module and calibration method thereof |
| CN103770650A (en) * | 2012-10-22 | 2014-05-07 | 中国北车集团大同电力机车有限责任公司 | Locomotive traction and auxiliary system integrated grounding protection device |
| CN103837806A (en) * | 2012-11-21 | 2014-06-04 | 赵元雷 | Insulation degree monitoring alarm device of electric automobile high voltage power supply system |
| CN104076254A (en) * | 2014-06-11 | 2014-10-01 | 惠州市亿能电子有限公司 | Alternating current excitation insulation detection circuit |
| CN104101784A (en) * | 2013-04-03 | 2014-10-15 | 比亚迪股份有限公司 | Detection circuit for insulation resistor |
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| CN106053947A (en) * | 2016-07-11 | 2016-10-26 | 北京长城华冠汽车科技股份有限公司 | Insulation resistance detection circuit and method of electric automobile power battery, and electric automobile |
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Application publication date: 20120425 |