CN203786252U - Electric automobile electrical insulation detection system - Google Patents
Electric automobile electrical insulation detection system Download PDFInfo
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- CN203786252U CN203786252U CN201420153091.8U CN201420153091U CN203786252U CN 203786252 U CN203786252 U CN 203786252U CN 201420153091 U CN201420153091 U CN 201420153091U CN 203786252 U CN203786252 U CN 203786252U
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Abstract
The utility model discloses an electric automobile electrical insulation detection system which comprises a voltage acquisition unit, a current acquisition unit, a fault alarm unit and an insulation detection data processing unit. The voltage acquisition unit monitors the voltage values of both ends of a voltage dividing resistor of a controllable switch in different states, and sends the voltage values to the insulation detection data processing unit. The current acquisition unit monitors the magnitude of positive and negative bus leakage current, positive bus current and negative bus current, and sends detection data to the insulation detection data processing unit. The insulation detection data processing unit is connected with a motor controller, and judges the working state of a motor. The output end of the insulation detection data processing unit is connected with the fault alarm unit. According to the utility model, different monitoring system insulation performances can be selected according to the working state of an automobile; reasonable detection state distribution is realized; considering influence factors of the working state of the system, signal interference and other factors is not needed; and the electric automobile electrical insulation detection system has the advantages of being safe and reliable, high measurement precision, and on-line monitoring.
Description
Technical field
The utility model relates to electric vehicle engineering field, is specifically related to a kind of electric automobile electrical insulation detection system.
Background technology
Electric automobile is a complicated electromechanical integrated product, relates to the relevant devices of forceful electric power such as electrokinetic cell, motor, charging set.Thereby the Insulation Inspection System of electric automobile is particularly important to the personal safety of driver and crew on car.The method that present stage is applied to electric automobile insulation detection has balanced bridge method, current sense method, resistance adaptation network method etc.Wherein, balanced bridge method utilizes principle of balance bridge to detect bus equivalent insulation resistance over the ground, and this method accuracy of detection is better, but requires the degree of accuracy of structure circuit very high, can not accurately and timely report to the police when both positive and negative polarity insulating property reduce simultaneously simultaneously.Current sense method adopts Hall-type current sensor to detect bus Leakage Current judgement electrical system insulativity, but the prerequisite of applying this detection method is power supply to be measured must be in running order, have inflow and the outflow of working current, it cannot evaluate power supply insulating property over the ground in the situation that of power-supply system zero load.Resistance adaptation network method is utilized circuit voltage divider principle, and by measuring the voltage of divider resistance, the group that establishes an equation is tried to achieve insulating resistance value.Although this method is widely used in electric automobile insulation detecting circuit, in electric automobile operational process, disturb greatlyr, in insulation measurement process, there is certain disturbing signal, larger on result of calculation impact.Although current method can be by monitoring different parameters judgement system insulation performance, Shortcomings still, for the higher method circuit structure relative complex of accuracy of detection, detection method has certain requirement to the duty of system, disturbed by outer signals larger, impact is measured and is calculated precision etc.
Utility model content
Technical problem to be solved in the utility model be to provide a kind of safe and reliable, measuring accuracy is high, can realize the electric automobile electrical insulation detection system of on-line monitoring.
For addressing the above problem, the electric automobile electrical insulation detection system that the utility model is designed, comprises the Insulation Inspection System body being arranged on electric automobile.
The electrical system of above-mentioned electric automobile comprises electric battery, inverter, motor and electric machine controller.The DC bus of electric battery connects the input end of inverter, and the output terminal of inverter connects motor, and electric machine controller is connected with the control end of inverter.
Above-mentioned Insulation Inspection System body comprises that voltage acquisition unit, current acquisition unit, fault alarm unit and insulation detect data processing unit.Voltage acquisition unit comprises divider resistance R0, R1, gate-controlled switch K1, K2, and voltage measurement chip C1, C2; After electric battery DC bus anode serial connection gate-controlled switch K1 on electric automobile and divider resistance R0, connect electric automobile car body; After electric battery DC bus anode serial connection gate-controlled switch K1 on electric automobile and divider resistance R0, connect electric automobile car body; After electric battery DC bus negative terminal serial connection gate-controlled switch K2 on electric automobile and divider resistance R1, connect electric automobile car body; The input anode of voltage measurement chip C1 and negative terminal are connected on the electric battery DC bus anode and electric automobile car body on electric automobile; The input anode of voltage measurement chip C2 and negative terminal are connected on the electric battery DC bus negative terminal and electric automobile car body on electric automobile; The output terminal of voltage measurement chip C1 and voltage measurement chip C2 is connected to the input end that insulation detects data processing unit.Current acquisition unit comprises Hall element A, B, C; Hall element A is simultaneously through electric battery positive direct-current bus and negative DC bus on electric automobile; Hall element B is through the electric battery positive direct-current bus on electric automobile; Hall element C is through the negative DC bus of the electric battery on electric automobile; The output terminal of Hall element A, Hall element B and Hall element C is connected to the input end that insulation detects data processing unit.Electric machine controller on electric automobile connects the input end that insulation detects data processing unit; The output terminal that insulation detects data processing unit connects fault alarm unit.
In such scheme, the fault alarm unit of described fault alarm unit for carrying on the fault alarm unit separately established or electric automobile.
In such scheme, described electric battery is lithium-ions battery group.
Compared with prior art, the utility model can be realized according to the duty of vehicle and select different modes monitoring system insulating property, and reasonably distribute detected state, without factors such as the influence factor of taking into account system duty and signal interference, so it will address the problem: 1. realize real-time online insulation and detect; 2. by monitoring current signal and two kinds of mode monitoring system insulativity of voltage signal; 3. circuit structure is simple, easily realizes.4. can be applicable to other Insulation Inspection Systems, there is good versatility.In addition, the utility model is high for the Hall current sensor measuring accuracy of measuring, and electric automobile can judge rapidly electrical system insulation status when driving, and circuit is simple, and reliability is high; Insulation resistance measurement circuit is easily realized, and algorithm is simple, for other Circuits System, has good versatility.
Accompanying drawing explanation
Fig. 1 is the utility model Insulation Inspection System structure principle chart.
Fig. 2 is the utility model voltage acquisition unit schematic diagram.
Fig. 3 is the utility model current acquisition unit schematic diagram.
Fig. 4 is that the utility model insulation detects data processing unit block diagram.
Embodiment
A kind of electric automobile electrical insulation detection system as shown in Figure 1, comprises the Insulation Inspection System body being arranged on electric automobile.The electrical system of the electric automobile that the utility model is applicable need include electric battery, inverter, motor and electric machine controller.The DC bus of electric battery connects the input end of inverter, and the output terminal of inverter connects motor, and electric machine controller is connected with the control end of inverter.In the present embodiment, described electric battery is lithium-ions battery group.
Above-mentioned Insulation Inspection System body comprises that voltage acquisition unit, current acquisition unit, fault alarm unit and insulation detect data processing unit.
Voltage acquisition unit comprises divider resistance R0, R1, gate-controlled switch K1, K2, and voltage measurement chip C1, C2.The present embodiment is looked car body for ground, and electric battery DC bus positive and negative electrode equivalent insulation resistance is over the ground respectively R+ and R-.After electric battery DC bus anode serial connection gate-controlled switch K1 on electric automobile and divider resistance R0, connecing electric automobile car body is ground connection; After electric battery DC bus anode serial connection gate-controlled switch K1 on electric automobile and divider resistance R0, connecing electric automobile car body is ground connection; After electric battery DC bus negative terminal serial connection gate-controlled switch K2 on electric automobile and divider resistance R1, connect electric automobile car body; The input anode of voltage measurement chip C1 and negative terminal are connected on the electric battery DC bus anode and electric automobile car body on electric automobile; The input anode of voltage measurement chip C2 and negative terminal are connected on the electric battery DC bus negative terminal and electric automobile car body on electric automobile.Referring to Fig. 2.
Current acquisition unit comprises Hall element A, B, C.Hall element A is simultaneously through electric battery positive direct-current bus and negative DC bus on electric automobile, output detections electric current I s.Hall element B passes the electric battery positive direct-current bus on electric automobile, output detections electric current I+; Hall element C bears DC bus through the electric battery on electric automobile, output detections electric current I-.Referring to Fig. 3.
The output terminal of voltage measurement chip C1 and voltage measurement chip C2 is connected to the input end that insulation detects data processing unit.The output terminal of Hall element A, Hall element B and Hall element C is connected to the input end that insulation detects data processing unit.Electric machine controller on electric automobile connects the input end that insulation detects data processing unit.Divider resistance both end voltage value under voltage acquisition unit monitoring gate-controlled switch different conditions, and send to insulation to detect data processing unit.Current acquisition unit monitoring positive and negative busbar leakage current, positive bus-bar electric current and negative busbar size of current, and send detection data to insulation detection data processing unit.Insulation detects data processing unit and is connected with electric machine controller simultaneously, judgement motor duty.During electric motor normal working, according to current signal judgement loop insulating property, when motor is not worked, according to voltage signal, calculate equivalent insulation resistance judgement loop insulating property.What this insulation detected data processing unit internal operation is known voltage and current comparison and determining method.The output terminal that insulation detects data processing unit connects fault alarm unit.In the utility model, described fault alarm unit can be the fault alarm unit configuring in addition; Also can continue to use the fault alarm unit carrying on electric automobile, now only need alerting signal be sent into the fault alarm unit carrying on electric automobile by former car CAN bus.Referring to Fig. 4.
Claims (3)
1. electric automobile electrical insulation detection system, comprises the Insulation Inspection System body being arranged on electric automobile;
The electrical system of above-mentioned electric automobile comprises electric battery, inverter, motor and electric machine controller; The DC bus of electric battery connects the input end of inverter, and the output terminal of inverter connects motor, and electric machine controller is connected with the control end of inverter;
It is characterized in that:
Above-mentioned Insulation Inspection System body comprises that voltage acquisition unit, current acquisition unit, fault alarm unit and insulation detect data processing unit; Wherein
Voltage acquisition unit comprises divider resistance R0, R1, gate-controlled switch K1, K2, and voltage measurement chip C1, C2; After electric battery DC bus anode serial connection gate-controlled switch K1 on electric automobile and divider resistance R0, connect electric automobile car body; After electric battery DC bus anode serial connection gate-controlled switch K1 on electric automobile and divider resistance R0, connect electric automobile car body; After electric battery DC bus negative terminal serial connection gate-controlled switch K2 on electric automobile and divider resistance R1, connect electric automobile car body; The input anode of voltage measurement chip C1 and negative terminal are connected on the electric battery DC bus anode and electric automobile car body on electric automobile; The input anode of voltage measurement chip C2 and negative terminal are connected on the electric battery DC bus negative terminal and electric automobile car body on electric automobile; The output terminal of voltage measurement chip C1 and voltage measurement chip C2 is connected to the input end that insulation detects data processing unit;
Current acquisition unit comprises Hall element A, B, C; Hall element A is simultaneously through electric battery positive direct-current bus and negative DC bus on electric automobile; Hall element B is through the electric battery positive direct-current bus on electric automobile; Hall element C is through the negative DC bus of the electric battery on electric automobile; The output terminal of Hall element A, Hall element B and Hall element C is connected to the input end that insulation detects data processing unit;
Electric machine controller on electric automobile connects the input end that insulation detects data processing unit; The output terminal that insulation detects data processing unit connects fault alarm unit.
2. electric automobile electrical insulation detection system according to claim 1, is characterized in that: the fault alarm unit of described fault alarm unit for carrying on the fault alarm unit separately established or electric automobile.
3. electric automobile electrical insulation detection system according to claim 1, is characterized in that: described electric battery is lithium-ions battery group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153091.8U CN203786252U (en) | 2014-03-31 | 2014-03-31 | Electric automobile electrical insulation detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153091.8U CN203786252U (en) | 2014-03-31 | 2014-03-31 | Electric automobile electrical insulation detection system |
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| CN203786252U true CN203786252U (en) | 2014-08-20 |
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| CN201420153091.8U Expired - Fee Related CN203786252U (en) | 2014-03-31 | 2014-03-31 | Electric automobile electrical insulation detection system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154112A (en) * | 2016-06-23 | 2016-11-23 | 李斯特技术中心（上海）有限公司 | The insulation monitor of electrified power assembly system and insulated monitoring method |
| CN106786835A (en) * | 2016-11-22 | 2017-05-31 | 天津烨伟科技有限公司 | A kind of battery electric quantity management system of electric automobile power information acquisition terminal |
| CN109239562A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239537A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239538A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| WO2022156805A1 (en) * | 2021-01-25 | 2022-07-28 | 中国第一汽车股份有限公司 | High-voltage monitoring method and apparatus, storage medium and system |
-
2014
- 2014-03-31 CN CN201420153091.8U patent/CN203786252U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154112A (en) * | 2016-06-23 | 2016-11-23 | 李斯特技术中心（上海）有限公司 | The insulation monitor of electrified power assembly system and insulated monitoring method |
| CN106786835A (en) * | 2016-11-22 | 2017-05-31 | 天津烨伟科技有限公司 | A kind of battery electric quantity management system of electric automobile power information acquisition terminal |
| CN109239562A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239537A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239538A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239562B (en) * | 2017-07-10 | 2022-08-09 | 比亚迪股份有限公司 | Train and insulation detection system of train |
| CN109239538B (en) * | 2017-07-10 | 2022-08-09 | 比亚迪股份有限公司 | Train and insulation detection system of train |
| CN109239537B (en) * | 2017-07-10 | 2022-08-09 | 比亚迪股份有限公司 | Train and insulation detection system of train |
| WO2022156805A1 (en) * | 2021-01-25 | 2022-07-28 | 中国第一汽车股份有限公司 | High-voltage monitoring method and apparatus, storage medium and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20150331 |
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| EXPY | Termination of patent right or utility model |