A vehicle high voltage direct current system insulation monitoring device and monitoring method
An insulation monitoring device, a high-voltage DC technology, which is used in measuring devices, measuring electrical variables, and measuring resistance/reactance/impedance. , to achieve the effect of improving safety and vehicle driving experience, improving vehicle safety, and avoiding missed alarms and false alarms
Active Publication Date: 2021-04-06
江苏迈吉易威电动科技有限公司
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Problems solved by technology
[0008] In addition, the existing vehicle HVDC system insulation monitoring technology does not have the internal self-test (Built-in-test, BIT) function
When the insulation monitoring device itself fails, a false alarm will affect the operation of the vehicle
If the insulation monitoring device cannot detect an insulation fault and a leakage alarm occurs, there is a potential risk
Method used
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Embodiment Construction
[0027] The present invention will be further explained below in conjunction with the accompanying drawings.
[0028] Such as figure 1 with figure 2 As shown, for an electric vehicle using a high-voltage DC 500V system, the insulation monitoring device for the high-voltage DC system of the vehicle includes an insulation detection circuit, a positive bus detection switch S 0A , negative bus detection switch S 0B , a first voltage detection circuit, a second voltage detection circuit, and a microcontroller.
[0029] The insulation detection circuit includes a low-voltage excitation power supply V CC , the first standard resistance R 1 , the second standard resistance R 2 , The third standard resistance R 3 , the fourth standard resistance R 4 , the first standard resistance switching switch S 1 , the second standard resistance switching switch S 2 . The third standard resistance R 3 One end is connected to the low-voltage excitation power supply V CC Negative pole, t...
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The invention discloses an insulation monitoring device and a monitoring method for a high-voltage DC system of a vehicle, which can be compatible with and meet the insulation performance detection requirements of the system in a high-voltage state or not in a high-voltage state, and can be enabled when the system insulation detection function is enabled. Previously, the built-in standard resistor was used for internal self-testing to confirm the effectiveness of the insulation detection function, thereby avoiding leakage and false alarms of the insulation monitoring device. When the system is not connected to high-voltage electricity, the positive busbar and the negative busbar are independently connected to the insulation detection circuit through the switch, and the standard resistor with the closest resistance range is selected to accurately measure the resistance of the equivalent insulation resistance. When the system is connected to high voltage, two built-in standard resistors and their series switches are used to create two circuit states, and the equivalent insulation resistance of the positive busbar to the car body and the negative busbar to the carbody are calculated based on the two measurement results The overall parallel value of the equivalent insulation resistance. Based on the measurement results of the insulation resistance, the vehicle insulation performance is evaluated.
Description
technical field [0001] The invention relates to the field of insulation monitoring or leakage detection of a high-voltage direct-current system of a pure electric vehicle or a hybrid vehicle adopting a high-voltage direct-current system. Background technique [0002] Pure electric vehicles or hybrid vehicles contain high-voltage components, including high-voltage power battery packs, high-voltage power distribution boxes, motor controllers, and high-voltage loads such as electric compressors and DC / DC. These high-voltage components will involve insulation problems, and the working environment of electric vehicles is complex. Vibration, temperature, humidity, and component aging will gradually reduce the insulation performance of the vehicle. [0003] When there is only a single-point insulation performance decline in the system, it will not have a significant impact on the system for the time being, but because the metal parts of the vehicle shell are charged at this time, t...
Claims
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IPC IPC(8): G01R27/02
Inventor 阮立刚施刚凌涛
Owner 江苏迈吉易威电动科技有限公司