An electric vehicle insulation monitoring and alarm method
A technology for insulation monitoring and electric vehicles, applied in the direction of testing dielectric strength, etc., can solve the problems of increased conductance, insulation resistance reduction, insulation resistance value reduction, etc., to achieve the effect of eliminating excessive protection, ensuring safe operation, and delaying the normal operation of vehicles
Active Publication Date: 2019-03-15
HIGER
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Problems solved by technology
In terms of humidity, the insulating surface absorbs moisture, and a water film is formed on the surface of the porcelain sleeve, which often reduces the insulation resistance significantly. When the relative humidity in the air is high, it will absorb more water, increase the conductance, and reduce the insulation resistance value.
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[0021] The electric vehicle insulation monitoring and alarm method disclosed in the present invention sets three-level insulation early warning, the first level is an insulation degradation early warning referring to the design insulation ratio, the second level is an insulation failure warning referring to the lower limit value of insulation self-learning, and the third level is an insulation failure warning referring to the insulation self-learning lower limit value. Level is an insulation fault alarm referring to the minimum insulation standard of 100Ω / V.
[0022] The ratio of the insulation resistance obtained on the insulation monitor to the nominal voltage of the high-voltage battery pack is used as the recorded value of the insulation resistance, and the unit is Ω / V. Since the temperature range of the battery compartment on an electric vehicle is -20°C to 60°C, and the humidity is within the range of 10% to 90%, the temperature and humidity values detected by the batte...
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The invention discloses an electric vehicle insulation monitoring and alarm method. Three-level insulation warning is set. The first level is an insulation degradation warning referring to a design insulation ratio, and the second level is an insulation failure warning referring to a lower limit value of insulation self-learning. The third level is an insulation fault alarm referring to the minimum insulation standard of 100Ω / V. The electric vehicle insulation monitoring and alarm method provided by the present invention sets three-level insulation early warning, sets the lower limit value of insulation resistance under different temperature and different humidity conditions, realizes self-adaptive learning insulation monitoring, ensures high design standards, and ensures that the vehicle Safe operation, eliminating over-protection and delaying the normal operation of the vehicle.
Description
technical field [0001] The invention relates to the field of electric vehicles, in particular to an insulation monitoring and alarm method for electric vehicles. Background technique [0002] Current electric vehicles are generally equipped with insulation monitors in the battery high voltage box. line continuous monitoring. The function of the insulation monitor is to measure the insulation resistance of the high-voltage system through the grounded neutral point. [0003] At present, the voltage platform of electric vehicles is mostly in the range of 350V to 750V, and insulation monitoring often reports insulation faults when the insulation resistance is lower than several megohms. The national standard is divided into two levels in terms of insulation monitoring, 500Ω / V and 100Ω / V. The design is carried out according to national standards, and the insulation requirements are often not met when the weather changes, causing many insulation failures. According to the desi...
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IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 朱乐凯王世强李竞克杜卫彬
Owner HIGER