CN213799288U - High-voltage interlocking detection circuit for electric automobile - Google Patents
High-voltage interlocking detection circuit for electric automobile Download PDFInfo
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- CN213799288U CN213799288U CN202022657926.1U CN202022657926U CN213799288U CN 213799288 U CN213799288 U CN 213799288U CN 202022657926 U CN202022657926 U CN 202022657926U CN 213799288 U CN213799288 U CN 213799288U
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Abstract
The utility model discloses an electric automobile high-voltage interlocking detection circuit, wherein high-voltage devices are provided with interlocking detection circuits which are connected with a main controller through CAN lines; an interlock relay is arranged in the interlock detection circuit, the interlock detection circuit is connected to 5V voltage, and the interlock detection circuit is connected through a high-voltage wiring harness plug-in short-circuit piece; the coil of the interlocking relay connects the high-voltage wiring harness plug-in with the grounding wire; the normally open contact of the interlock relay connects the microprocessor acquisition pin with the reference voltage terminal of the high-voltage device control circuit. By adopting the technical scheme, the high-voltage damage of hardware is avoided, the high-voltage interlocking fault open circuit point is accurately judged, the circuit structure is simple, and the cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of electric automobile driving system. More specifically, the utility model relates to an electric automobile high pressure interlocking detection circuitry.
Background
The High Voltage Interlock (HVIL) is an abbreviation of a High Voltage Interlock Loop (Hazardous Voltage Interlock Loop), also called a dangerous Voltage Interlock Loop (US7586722 High Voltage Interlock System and Control Strategy). The high-voltage interlocking system is used for checking all branches connected with a high-voltage bus on the electric automobile by using a low-voltage signal, and comprises the electrical connection integrity and continuity of a whole power battery system, a high-voltage lead, a connector, a DC/DC (direct current converter), a motor controller, a high-voltage distribution box, a protective cover, an OBC (on-board battery charger) and other system loops.
When the connection and disconnection of the high-voltage loop or the connection integrity are damaged, the vehicle starts safety protection measures, such as emergency power-off of the electric vehicle and disconnection of a high-voltage output loop.
At present, the principle of high-voltage interlocking of an electric vehicle is that a passage is connected with all high-voltage devices and connectors on a wire harness in series and finally connected to a Battery Management System (BMS), and the BMS detects the on-off of the line to judge whether the high-voltage interlocking is broken or not and judge whether the whole vehicle has an interlocking fault or not; for example:
chinese patent documents:
1. a high voltage interlocking insert structure (201820332770. X);
2. a high-pressure interlock system (201721655848.3);
3. a high voltage interlock detection circuit (201610896720. X);
4. a high voltage interlock fault detection device (201821351159.8.
The technical solutions provided by the above documents have the following problems:
when a new vehicle of a production enterprise is off-line, the problem that the whole vehicle cannot be normally powered on due to high-voltage interlocking is often encountered, whether an interlocking line is on or off can only be detected due to BMS (battery management system), but the position of the interlocking line is not judged, and when troubleshooting is caused, a relevant connector or an ECU (electronic control unit) at each position needs to be disassembled for troubleshooting, and the troubleshooting can be determined to be completed until the whole vehicle does not report the high-voltage interlocking fault, so that the production efficiency is influenced.
In addition, the range of the voltage platform of the electric automobile is 300-600V, the EMC (electromagnetic compatibility) performance of the electric automobile is worse than that of the traditional automobile, high-voltage pulses are easily transmitted into an interlocking acquisition circuit, and hardware damage of the controller is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electric automobile high pressure interlocking detection circuitry, its purpose is avoided the hardware high pressure to damage and accurate judgement high pressure interlocking fault break point.
In order to realize the purpose, the utility model discloses the technical scheme who takes does:
the utility model discloses an electric automobile high pressure interlocking detection circuitry, electric automobile include a plurality of high-voltage devices; the high-voltage devices are provided with interlocking detection circuits which are connected with the main controller through CAN lines; an interlock relay is arranged in the interlock detection circuit, the interlock detection circuit is connected to 5V voltage, and the interlock detection circuit is connected with the interlock detection circuit through a high-voltage wiring harness plug-in short-circuit piece; the coil of the interlocking relay connects the high-voltage wiring harness plug-in with the grounding wire; and a normally open contact of the interlocking relay connects a microprocessor acquisition pin with a reference voltage terminal of a high-voltage device control circuit.
The high-voltage device comprises a vehicle-mounted charger, a direct-current converter, a motor controller and an air-conditioning compressor.
The vehicle-mounted charger, the direct current converter and the motor controller are connected with the power battery through a high-voltage wire harness. The air conditioner compressor is connected with the high-voltage distribution box through a high-voltage wire harness.
The main controller is connected with the upper computer through a signal line.
By adopting the technical scheme, the interlocking detection circuit is arranged in all parts related to high-voltage interlocking, so that a high-voltage interlocking fault disconnection point can be accurately positioned, and the isolation control is carried out through the relay, so that the direct connection of an MCU pin with an interlocking circuit is avoided; the hardware damage condition of the MCU caused by sudden change of voltage pulses of the interlocking circuit is avoided; the problems that in the prior art, high-voltage interlocking faults of the electric automobile are difficult to check, and hardware of an interlocking detection controller is easy to damage are solved; when the interlocking fault occurs, the troubleshooting personnel can quickly and efficiently find the interlocking fault point to solve the problem of the interlocking fault; the structure of a high-voltage connector does not need to be changed, only a voltage acquisition circuit and a relay are added in parts, and interlocking information is added in a software communication protocol, so that the cost is reduced, and the circuit structure is simple.
Drawings
Fig. 1 is an OBC circuit diagram of the high-voltage interlock detection system of the present invention;
fig. 2 is a schematic structural diagram of each module in the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention by those skilled in the art.
Abbreviations herein: PDU-high Voltage distribution Box; MCU-microcontroller; OBC-vehicle charger; BMS — battery management system; DCDC-direct current converter.
The structure of the utility model, as shown in fig. 1 and fig. 2, is a high-voltage interlock detection circuit for an electric vehicle, the electric vehicle comprises a plurality of high-voltage devices. The high-voltage device comprises a vehicle-mounted charger, a direct-current converter, a motor controller and an air-conditioning compressor.
In order to solve the problem that prior art exists and overcome its defect, realize avoiding the high-pressure damage of hardware and the invention purpose of accurate judgement high pressure interlocking trouble trip point, the utility model discloses the technical scheme who takes is:
as shown in fig. 1 and 2, the high-voltage interlock detection circuit of the electric vehicle of the present invention, wherein the high-voltage devices are all provided with interlock detection circuits, and the interlock detection circuits are connected with the main controller through the CAN lines; an interlock relay is arranged in the interlock detection circuit, the interlock detection circuit is connected to 5V voltage, and the interlock detection circuit is connected with the interlock detection circuit through a high-voltage wiring harness plug-in short-circuit piece; the coil of the interlocking relay connects the high-voltage wiring harness plug-in with the grounding wire; and a normally open contact of the interlocking relay connects a microprocessor acquisition pin with a reference voltage terminal of a high-voltage device control circuit.
In the technical scheme, parts related to high-voltage interlocking are provided with interlocking detection circuits and are connected with a main controller through a CAN bus; the parts are directly connected with a power distribution unit or a power battery through a high-voltage wire harness; increase interlock relay (also called isolation relay) among the spare part interlock detection circuitry, keep apart MCU (microcontroller) and gather the pin, avoid interlock circuit and controller pin direct linking to each other, and then avoid leading to the controller hardware damage condition because of high-voltage pulse.
The vehicle-mounted charger, the direct current converter and the motor controller are connected with the power battery through a high-voltage wire harness. The air conditioner compressor is connected with the high-voltage distribution box through a high-voltage wire harness.
The interlocking circuit is connected to 5V voltage, and the high-voltage wiring harness connects plug-in components short circuit piece UNICOM interlocking circuit.
In fig. 1, the OBC module interlock circuit is connected to 5V voltage, the connector short tab is connected to the 5V voltage and the relay interlock circuit, and the MCU is connected to the CAN bus.
The interlocking detection circuit is in short circuit connection with the interlocking line through the connector short-circuit piece. When the interlocking circuit is switched on, the relay armature is attracted, the MCU collects reference voltage, judges whether the connector is well communicated or not, reports the collected signals to the BMS through CAN line communication, and the BMS processes all node signals and judges whether the interlocking fault exists in the whole vehicle or not.
In spare part interlocking detection circuitry, increase isolation relay, avoid interlocking circuit and MCU pin direct linking to each other, perfect solution MCU hardware damage risk, each spare part can report the interlocking line state of judgement to main control unit BMS in addition, and when taking place the interlocking trouble, the troubleshooting personnel can be fast, and the interlock fault point is found to the efficient, solves the interlocking trouble problem.
The utility model discloses the hardware need not to change high-pressure connector structure with the inside high-pressure interlocking short connector piece design of all present high-pressure connectors, only increases voltage acquisition circuit and relay in spare part, increases in the software communication agreement interlocking information can, cost reduction, circuit structure is simple.
The specific working principle is shown in fig. 1:
when the short connecting piece of the connector is well connected, the relay attracts the armature, the MCU collects the pins and is connected to the reference voltage, and at the moment, the interlocking circuit is judged to be in a conducting state and reports the interlocking state to the main controller through the CAN communication line.
On the contrary, when the connector short-circuit piece UNICOM appears and opens circuit, the unable actuation of relay 1 this moment, MCU pin is not connected to reference voltage 1 on, judges that interlocking circuit opens circuit this moment.
As shown in fig. 1, if high voltage pulse occurs on the interlock circuit due to the influence of high voltage, only the magnetic group or circuit of the relay 1 is damaged, and the MCU pin is not directly damaged, which is safer and more reliable.
The main controller is connected with the upper computer through a signal line.
Maintenance personnel can find and report the interlocking fault controller through the controller upper computer, and then quickly troubleshoot and solve the problem of high-voltage interlocking faults.
Like each high-voltage part in fig. 2, the internal structure is basically the same as that in fig. 1, and the difference is only between the high-voltage parts and the internal MCU.
The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, and various insubstantial improvements can be made without modification to the method and technical solution of the present invention, or the present invention can be directly applied to other occasions without modification, all within the scope of the present invention.
Claims (5)
1. The utility model provides an electric automobile high pressure interlocking detection circuitry, electric automobile include a plurality of high-voltage devices, its characterized in that: the high-voltage devices are provided with interlocking detection circuits which are connected with the main controller through CAN lines; an interlock relay is arranged in the interlock detection circuit, the interlock detection circuit is connected to 5V voltage, and the interlock detection circuit is connected with the interlock detection circuit through a high-voltage wiring harness plug-in short-circuit piece; the coil of the interlocking relay connects the high-voltage wiring harness plug-in with the grounding wire; and a normally open contact of the interlocking relay connects a microprocessor acquisition pin with a reference voltage terminal of a high-voltage device control circuit.
2. The electric vehicle high voltage interlock detection circuit according to claim 1, wherein: the high-voltage device comprises a vehicle-mounted charger, a direct-current converter, a motor controller and an air-conditioning compressor.
3. The electric vehicle high voltage interlock detection circuit according to claim 2, wherein: the vehicle-mounted charger, the direct current converter and the motor controller are connected with the power battery through a high-voltage wire harness.
4. The electric vehicle high voltage interlock detection circuit according to claim 2, wherein: the air conditioner compressor is connected with the high-voltage distribution box through a high-voltage wire harness.
5. The electric vehicle high voltage interlock detection circuit according to claim 1, wherein: the main controller is connected with the upper computer through a signal line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022657926.1U CN213799288U (en) | 2020-11-17 | 2020-11-17 | High-voltage interlocking detection circuit for electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022657926.1U CN213799288U (en) | 2020-11-17 | 2020-11-17 | High-voltage interlocking detection circuit for electric automobile |
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| CN213799288U true CN213799288U (en) | 2021-07-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884783A (en) * | 2021-08-27 | 2022-01-04 | 杭州伯坦科技工程有限公司 | Novel high-voltage interlocking detection system and method |
| CN116068382A (en) * | 2023-03-07 | 2023-05-05 | 深圳艾为电气技术有限公司 | Compressor port state detection system and detection method |
-
2020
- 2020-11-17 CN CN202022657926.1U patent/CN213799288U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884783A (en) * | 2021-08-27 | 2022-01-04 | 杭州伯坦科技工程有限公司 | Novel high-voltage interlocking detection system and method |
| CN113884783B (en) * | 2021-08-27 | 2023-09-19 | 杭州伯坦科技工程有限公司 | Novel high-voltage interlocking detection system and method |
| CN116068382A (en) * | 2023-03-07 | 2023-05-05 | 深圳艾为电气技术有限公司 | Compressor port state detection system and detection method |
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Effective date of registration: 20230404 Address after: Floor 18, Building 13, Science and Technology Industrial Park, No. 717 Zhongshan South Road, Wuhu High tech Industrial Development Zone, Yijiang District, Wuhu City, Anhui Province, 241000 Patentee after: Wuhu Tairui Automobile Co.,Ltd. Address before: 241000 Building 8, science and Technology Industrial Park, 717 Zhongshan South Road, Yijiang District, Wuhu City, Anhui Province Patentee before: Chery Commercial Vehicles (Anhui) Co., Ltd. |