CN210269993U - Electric vehicle insulation resistance monitor based on small signal injection method - Google Patents
Electric vehicle insulation resistance monitor based on small signal injection method Download PDFInfo
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- CN210269993U CN210269993U CN201921066211.XU CN201921066211U CN210269993U CN 210269993 U CN210269993 U CN 210269993U CN 201921066211 U CN201921066211 U CN 201921066211U CN 210269993 U CN210269993 U CN 210269993U
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Abstract
The utility model provides an electric motor car insulation resistance monitor based on small-signal injection method which characterized in that includes: the circuit board reaches the singlechip of being connected with the circuit board, be equipped with connector 1, connector 2, connector 3 on the circuit board, communication module is connected to the singlechip, communication module reads, sends data to terminal, the singlechip is connected and is injected signal pulse measurement voltage and produce the circuit, singlechip connection status output circuit, the singlechip passes through relay control and connects insulating detection circuit board, insulating detection circuit is supplied power by the battery, insulating detection circuit chassis ground connection, connector 1 connects L-, connector 2 connects L +, be equipped with terminal 1, 2, 3, 4, 5, 6, 7, 8 on the connector 3. The method has the advantages of monitoring asymmetric faults, symmetric faults, direct current faults and alternating current faults, along with simple circuit and high precision.
Description
Technical Field
The utility model relates to a monitoring facilities, in particular to electric motor car insulation resistance monitor based on small-signal injection method.
Background
Compared with a traditional vehicle, the electric vehicle has a whole set of high-voltage components (ESS, DCDC, motor and the like), and once the vehicle collides and the components are aged in a complex application environment, the insulation performance can be reduced to increase the potential of a chassis, so that the work of vehicle-mounted equipment and an ECU (electronic control unit) is influenced, and the heat accumulation effect of a leakage loop can cause the vehicle to ignite and burn. In order to ensure the personal safety of a driver, the BMS specified in the vehicle-mounted rechargeable energy storage system needs to perform insulation detection in a state that all components of the power battery system are integrated, and the insulation state is measured by adopting the resistance value of an insulation resistor. Insulation warning is further explained in a mandatory standard draft of GB electric vehicle safety requirement in 1 month 2018, the mandatory requirement is insulation resistance monitoring, and when the insulation resistance of the whole vehicle is lower than the specified requirement, an obvious signal (such as an acoustic or optical signal) is used for reminding a driver.
In the prior art, the sensitivity is low in a voltammetry monitoring mode, a balanced bridge method cannot accurately and timely give an alarm when the insulation of a positive electrode and a negative electrode is reduced, the ripple of a direct current system is increased by injecting an alternating current signal method, the power supply quality is influenced, the distributed capacitance of the system can directly influence the measurement result, the resolution ratio is low, the insulation resistance of a positive bus and a negative bus which are symmetrically grounded at two ends cannot be accurately calculated, and the phenomena of missed alarm or wrong alarm insulation fault easily occur due to low detection precision of the insulation resistance under the condition that an electric automobile is in a high electromagnetic interference environment.
SUMMERY OF THE UTILITY MODEL
Not enough to the above among the prior art, the utility model provides an electric motor car insulation resistance monitor based on small-signal injection method monitors asymmetric trouble, and monitoring symmetry trouble monitors direct current trouble, monitors alternating current trouble, and the circuit is simple, and the precision is high.
In order to achieve the above object, the utility model adopts the following technical scheme:
an electric vehicle insulation resistance monitor based on a small signal injection method comprises: the circuit board is provided with a connector 1, a connector 2 and a connector 3, the single chip is connected with a communication module, and the communication moduleReading and sending data to a terminal, wherein the singlechip is connected with an injection signal pulse measurement voltage generation circuit, the singlechip is connected with a state output circuit, the singlechip is connected with an insulation detection circuit board through relay control, the insulation detection circuit is powered by a battery, a chassis of the insulation detection circuit is grounded, the connector 1 is connected with L-, the connector 2 is connected with L +, the connector 3 is provided with terminals 1, 2, 3, 4, 5, 6, 7 and 8, the terminals are Us-, and the chassis is grounded; the terminal 2 is Us + and is connected with a power supply voltage; the terminal 3 is E1, and the chassis is grounded; the terminal 4 is E2, and the chassis is grounded; the terminal 5 is MLSData output PWM, low-end isoEV-101; the terminal 6 is MHSData output PWM, high-end isoEV-102; the terminal 7 is PRHSOutputting an early warning; the terminal 8 is OKHSAnd outputting the state.
Further, isoEV-101/102 generates a pulsed measurement voltage, which is superimposed by terminals L +/L-and E1/E2 without ground, and the measured insulation resistance value is passed through terminal MHSOr MLSThe connection between terminals E1/E2 and the chassis ground is continuously monitored and terminals E1 and E2 are connected to the chassis by two wires, respectively.
The utility model has the advantages that:
isoEV-101/102 generates a pulsed measurement voltage, which is superimposed by terminals L +/L-and E1/E2 without ground, and the measured insulation resistance value is passed through terminal MHSOr MLSThe connection between terminals E1/E2 and the chassis ground is continuously monitored and terminals E1 and E2 are connected to the chassis via two wires, respectively. The method has the advantages of monitoring asymmetric faults, symmetric faults, direct current faults and alternating current faults, along with simple circuit and high precision.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the insulation monitoring circuit of the present invention;
FIG. 3 is a flow chart of the active detection of insulation resistance according to the present invention;
FIG. 4 is a circuit diagram of the present invention;
fig. 5 is a schematic diagram of the access device structure of the present invention.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals.
It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
In order to make the content of the present invention more clearly understood, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the attached drawings in the embodiment of the present invention.
As shown in fig. 1 to 5, an insulation resistance monitor for an electric vehicle based on a small signal injection method includes: the circuit board is provided with a connector 1, a connector 2 and a connector 3, the single chip is connected with a communication module, the communication module reads and sends data to a terminal, the single chip is connected with an injection signal pulse measurement voltage generation circuit, the single chip is connected with a state output circuit, the single chip is connected with an insulation detection circuit board through relay control, the insulation detection circuit is powered by a battery, a chassis of the insulation detection circuit is grounded, the connector 1 is connected with L-, the connector 2 is connected with L +, the connector 3 is provided with terminals 1, 2, 3, 4, 5, 6, 7 and 8, and the terminals are Us-and the chassis is grounded; the terminal 2 is Us + and is connected with a power supply voltage; the terminal 3 is E1, and the chassis is grounded; the terminal 4 is E2, and the chassis is grounded; the terminal 5 is MLSData output PWM, low-end isoEV-101; the terminal 6 is MHSData output PWM, high-end isoEV-102; the terminal 7 is PRHSOutputting an early warning; the terminal 8 is OKHSAnd outputting the state.
isoEV-101/102 generates a pulse measurement voltage, and the absolute value of the measurement is superposed with no ground through terminals L +/L-and E1/E2Edge resistance value passing terminal MHSOr MLSThe connection between terminals E1/E2 and the chassis ground is continuously monitored and terminals E1 and E2 are connected to the chassis by two wires, respectively.
Insulation resistance monitor monitoring process: (1) starting; (2) initializing and setting self calibration; (3) judging whether the wiring of Us, E1 and E2 is good or not; (4) generating pulse measuring voltage to be superposed on an ungrounded system; (5) monitoring resistance and voltage values between terminals L +, L-and chassis ground; (6) judging a fault, and outputting a fault code and a digital code; (7) reach alarm value, with OKHSOutputting the port; (8) outputting an alarm signal; and (8) circulating to the step (3).
The fault information (insulation fault, connection fault of the detector, self error) is output through the photoelectric isolation interface (high end or low end), the photoelectric isolation interface is respectively a state Output (OK)HSOutput), an early warning output (PR)HSOutput) and a measured value output (M)HS、MLSOutput) interface, the measured value output interface outputs the measured insulation resistance and error type in a PWM manner.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. The utility model provides an electric motor car insulation resistance monitor based on small-signal injection method which characterized in that includes: the circuit board reaches the singlechip of being connected with the circuit board, be equipped with connector 1, connector 2, connector 3 on the circuit board, communication module is connected to the singlechip, communication module reads, sends data to terminal, the singlechip is connected and is injected signal pulse measurement voltage and produce the circuit, state output circuit is connected to the singlechip, the singlechip passes through relay control and connects insulating detection circuit board, insulating detection circuit is supplied power by the battery, insulating detection circuit is equipped with connector 1, connector 2, connector 3The chassis is grounded, the connector 1 is connected with L-, the connector 2 is connected with L +, and the connector 3 is provided with terminals 1, 2, 3, 4, 5, 6, 7 and 8, wherein the terminals are Us-, and the chassis is grounded; the terminal 2 is Us + and is connected with a power supply voltage; the terminal 3 is E1, and the chassis is grounded; the terminal 4 is E2, and the chassis is grounded; the terminal 5 is MLSData output PWM, low-end isoEV-101; the terminal 6 is MHSData output PWM, high-end isoEV-102; the terminal 7 is PRHSOutputting an early warning; the terminal 8 is OKHSAnd outputting the state.
2. The electric vehicle insulation resistance monitor based on the small signal injection method as claimed in claim 1, characterized in that: isoEV-101/102 generates a pulsed measurement voltage, which is superimposed by terminals L +/L-and E1/E2 without ground, and the measured insulation resistance value is passed through terminal MHSOr MLSThe connection between terminals E1/E2 and the chassis ground is continuously monitored and terminals E1 and E2 are connected to the chassis by two wires, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921066211.XU CN210269993U (en) | 2019-07-09 | 2019-07-09 | Electric vehicle insulation resistance monitor based on small signal injection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921066211.XU CN210269993U (en) | 2019-07-09 | 2019-07-09 | Electric vehicle insulation resistance monitor based on small signal injection method |
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| CN210269993U true CN210269993U (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111796204A (en) * | 2020-06-08 | 2020-10-20 | 力高(山东)新能源技术有限公司 | Method and system for judging voltage stability of new energy automobile by small signal insulation detection |
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2019
- 2019-07-09 CN CN201921066211.XU patent/CN210269993U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111796204A (en) * | 2020-06-08 | 2020-10-20 | 力高(山东)新能源技术有限公司 | Method and system for judging voltage stability of new energy automobile by small signal insulation detection |
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