CN211043506U - Electric vehicle insulation resistance monitor based on embedded circuit board - Google Patents

Abstract

The utility model provides an electric motor car insulation resistance monitor based on embedded circuit board, includes: the embedded IsoEV-emb daughter board is provided with a single chip microcomputer, the single chip microcomputer is connected with a communication module, the communication module reads and sends data to a terminal, the single chip microcomputer is connected with an injection signal pulse measurement voltage generation circuit, the single chip microcomputer is connected with a state output circuit, the single chip microcomputer is connected with an insulation detection circuit through relay control, the insulation detection circuit is powered by a battery, a chassis of the insulation detection circuit is grounded, one side face of the embedded IsoEV-emb daughter board is provided with 8 pins, the other side of the embedded IsoEV-emb daughter board is provided with 7 pins, and two points at the upper end of the single chip microcomputer are positioning points. The accuracy and the response time of monitoring insulation resistance are improved, the insulation monitoring function of high precision is still carried out under the influence of more external factors, the insulation resistance of a single end and double ends can be accurately monitored, and the safety of a driver and a driving vehicle is ensured.

Description

Electric vehicle insulation resistance monitor based on embedded circuit board

Technical Field

The utility model relates to a resistance monitor, in particular to electric motor car insulation resistance monitor based on embedded circuit board.

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 current market state of the insulation monitor in China, on the technical level, some problems are solved and the development speed is faster and faster after the basic functional application is further improved, but some aspects need to be improved. The existing charging equipment and insulation monitoring technology are relatively simple and cannot meet the multifunctional requirement. There are many insulation detection techniques for dc high voltage systems in China, and there are many monitoring methods, but all have some disadvantages. For the field of embedded insulation monitors, the product types are relatively few, the installation is inconvenient, the matching degree is not high, and the relative parameters are relatively fixed;

SUMMERY OF THE UTILITY MODEL

To the above-mentioned among the prior art not enough, the utility model provides an electric motor car insulation resistance monitor based on embedded circuit board improves monitoring insulation resistance's precision and response time, still carries out the insulation monitoring function of high accuracy under the influence in the face of more external factors, can all carry out accurate monitoring to the insulation resistance of single-ended and bi-polar, ensures the safety of driver and driving vehicle.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides an electric motor car insulation resistance monitor based on embedded circuit board, includes: the embedded IsoEV-emb daughter board is provided with a single chip microcomputer, the single chip microcomputer is connected with a communication module, the communication module reads and sends data to a terminal, the single chip microcomputer is connected with an injection signal pulse measurement voltage generation circuit, the single chip microcomputer is connected with a state output circuit, the single chip microcomputer is connected with an insulation detection circuit through relay control, the insulation detection circuit is powered by a battery, a chassis of the insulation detection circuit is grounded, one side face of the embedded IsoEV-emb daughter board is provided with 8 pins, the other side of the embedded IsoEV-emb daughter board is provided with 7 pins, and two points at the upper end of the single chip microcomputer are positioning points.

Further, 8 pins are respectively pin 1 of E1, the chassis is grounded, pin 2 of Us-, i.e., 12V power supply negative, pin 3 of Us +, i.e., 12V power supply positive, pin 4 of nop, i.e., empty, pin 5 of Tx, i.e., data transmission, pin 6 of Rx, i.e., data reception, pin 7 of Uo-, i.e., 3.3V power supply negative, pin 8 of Uo +, i.e., 3.3V power supply positive, 7 pins are respectively pin 9 of L-, i.e., power battery negative coupling resistor string, pin 10 of L-, i.e., power battery negative coupling resistor string, pin 11 of nop, i.e., empty, pin 12 of nop, i.e., empty, pin 13 of nop, i.e., empty, pin 14 of L +, i.e., power battery positive coupling resistor string, and pin 15 of L +, i.e., power battery positive coupling resistor string.

Furthermore, the insulation resistance monitor is powered by a 12VDC external direct current power supply, the external direct current power supply is an adjustable high-voltage DC power supply and a low-voltage adjustable DC power supply respectively, a pin L + and a pin L-are connected with 10 resistors of 240K omega respectively in series, the analog resistors of the pin L + and the pin L-are 100K omega, 500K omega and 1M omega, the analog capacitors are 0.1uF, 0.22uF and 0.47uF, the pins Tx and Rx of the embedded insulation monitor correspond to the pins Rx and Tx of the communication module, and finally the embedded insulation monitor is connected to a PC end to read data field codes by using a corresponding platform.

Further, the embedded IsoEV-emb daughter board generates pulse measurement voltage which is superposed on an ungrounded system through pins L +, L-and E1, a newly measured insulation resistance value is output through a Tx pin, the connection between the pin E1 and the chassis ground, i.e. a pin Us-, is continuously monitored, and the pin E1 is connected with the chassis.

The utility model has the advantages that:

the accuracy and the response time of monitoring insulation resistance are improved, the insulation monitoring function of high precision is still carried out under the influence of more external factors, the insulation resistance of a single end and double ends can be accurately monitored, and the safety of a driver and a driving vehicle is ensured. The flexible module is gradually improved in communication, and the flexible module is adjustable in all parameters, wider in applicability and more reliable in functionality. The data fed back by the communication module is more stable and accurate.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of the embedded IsoEV-emb daughter board pin of the present invention;

FIG. 3 is a circuit diagram of the present invention;

fig. 4 is a monitoring flow chart 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 4, an insulation resistance monitor for an electric vehicle based on an embedded circuit board includes: the embedded IsoEV-emb daughter board is provided with a single chip microcomputer, the single chip microcomputer is connected with a communication module, the communication module reads and sends data to a terminal, the single chip microcomputer is connected with an injection signal pulse measurement voltage generation circuit, the single chip microcomputer is connected with a state output circuit, the single chip microcomputer is connected with an insulation detection circuit through relay control, the insulation detection circuit is powered by a battery, a chassis of the insulation detection circuit is grounded, one side face of the embedded IsoEV-emb daughter board is provided with 8 pins, the other side of the embedded IsoEV-emb daughter board is provided with 7 pins, and two points at the upper end of the single chip microcomputer are positioning points.

The method comprises the steps of firstly, respectively, testing a fault detection system, namely a chassis grounding test system, a chassis fault detection system, a chassis monitoring system, a chassis fault detection system, a fault detection system and a fault detection system, wherein 8 pins are respectively, pin 1 is E1, chassis grounding, chassis monitoring terminals, 2, 12V power supply terminals, 12V power supply ground terminals, 12 and 7 pins, 2 pins, 7 pins, 2 pins, 7 pins, 2 pins, a power battery negative pins, 2 pins, a power supply terminals, 2 pins, a power source terminals, a power battery negative terminals, 2 pins.

The insulation monitor is used for monitoring the insulation resistance between a high-voltage component (0V-1000V) of a power supply system of an electric vehicle (pure electric or hybrid power) and a reference ground (a vehicle chassis is grounded). The method can monitor the insulation fault of the direct current side and the insulation fault of the alternating current machine side, fault information (insulation fault, wiring fault of a detector or self error)/early warning information/alarm information/insulation resistance value/voltage value, and outputs the fault information/early warning information/alarm information/insulation resistance value/voltage value through the photoelectric isolation interface Tx. The upper computer can send a setting command to the insulation monitor through the photoelectric isolation interface Rx.

The method is connected to an electric vehicle for supplying 12VDC, continuously measuring the insulation resistance of 0-10 MOmega, continuously monitoring the response time of the insulation resistance measurement of less than 10s, the self-adaptive system drain capacitance of 2 muF, and the ground wire connection state, and is used for the insulation fault monitoring of an electric vehicle ungrounded system (IT system), an alternating current system and a direct current system with the voltage of 0-1000V, the under-voltage detection with the voltage lower than 300V, and the communication function (photoelectric isolation).

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 (4)

1. The utility model provides an electric motor car insulation resistance monitor based on embedded circuit board which characterized in that includes: the embedded IsoEV-emb daughter board is provided with a single chip microcomputer, the single chip microcomputer is connected with a communication module, the communication module reads and sends data to a terminal, the single chip microcomputer is connected with an injection signal pulse measurement voltage generation circuit, the single chip microcomputer is connected with a state output circuit, the single chip microcomputer is connected with an insulation detection circuit through relay control, the insulation detection circuit is powered by a battery, a chassis of the insulation detection circuit is grounded, one side face of the embedded IsoEV-emb daughter board is provided with 8 pins, the other side of the embedded IsoEV-emb daughter board is provided with 7 pins, and two points at the upper end of the single chip microcomputer are positioning points.

2. The embedded circuit board-based insulation resistance monitor for the electric vehicle as claimed in claim 1, wherein 8 pins are pin 1E 1, the chassis is grounded, pin 2 is Us-, i.e. 12V power negative, pin 3 is Us +, i.e. 12V power positive, pin 4 is nop, i.e. empty, pin 5 is Tx, i.e. data transmission, pin 6 is Rx, i.e. data reception, pin 7 is Uo-, i.e. 3.3V power negative, pin 8 is Uo +, i.e. 3.3V power positive, 7 pins are pin 9L-, i.e. power battery negative coupling resistor string, pin 10 is L-, i.e. power battery negative coupling resistor string, pin 11 is nop, i.e. empty, pin 12 is nop, i.e. empty, pin 13 is nop, i.e. empty, pin 14 is L +, i.e. power battery positive coupling resistor string, and pin 15 is L +, i.e. power battery positive coupling resistor string.

3. The embedded circuit board-based insulation resistance monitor for the electric vehicle as claimed in claim 2, wherein the insulation resistance monitor is powered by a 12VDC external direct current power supply, the external direct current power supply is an adjustable high voltage DC power supply and a low voltage adjustable DC power supply, the pins L + and L-are respectively connected with 10 resistors of 240 KQ, the analog resistors of the pins L + and L-are 100 KQ, 500 KQ and 1 MQ, the analog capacitors are 0.1uF, 0.22uF and 0.47uF, the pins Tx and Rx of the embedded insulation monitor correspond to the pins Rx and Tx of the communication module, and finally the embedded insulation monitor is connected to the PC end to read data field codes by using a corresponding platform.

4. The monitor of claim 2, wherein the embedded IsoEV-emb daughter board generates a pulse measurement voltage, which is superimposed on the ungrounded system through pins L +, L-and E1, a newly measured insulation resistance value is outputted through Tx pin, the connection between pin E1 and chassis ground, i.e., pin Us-, is continuously monitored, and pin E1 is connected to the chassis.

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