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A new energy vehicle and its insulation detection method and system

A technology for new energy vehicles and detection methods, applied in the field of new energy vehicles and their insulation detection, can solve the problems of reducing insulation detection accuracy and slow detection speed, and achieve the effect of improving insulation detection speed and ensuring real-time effectiveness.

Active Publication Date: 2019-06-28
深蓝汽车科技有限公司
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Problems solved by technology

[0004] However, since there are Y capacitors with different capacitances in the power system of the new energy vehicle, the pulse signal injected into the new energy vehicle will be affected by the RC charging characteristics of the Y capacitor, thereby reducing the accuracy of insulation detection
The existing pulse injection detection method will set a long enough fixed time to avoid the influence of the Y capacitor on the insulation detection, but this will make it take 10s or even longer to complete an insulation resistance detection, and the detection speed is quite slow

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  • A new energy vehicle and its insulation detection method and system
  • A new energy vehicle and its insulation detection method and system
  • A new energy vehicle and its insulation detection method and system

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Embodiment Construction

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0051] The embodiment of the invention discloses a new energy vehicle insulation detection method, see figure 1 As shown, the method includes:

[0052] Step S11: Under the condition that the internal hardware circuit of the new energy vehicle can work normally, input the original injection pulse to the pulse input terminal of the new energy vehicle, and collect the pulse signal output by the pulse output terminal of the current new energy ...

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Abstract

The application discloses a new energy vehicle and an insulation detection method and a system thereof. The method comprises the following steps: inputting an original injection pulse to a new energy vehicle, and collecting a pulse signal currently output by the new energy vehicle to get a real-time recovery pulse; judging whether the voltage amplitude of the real-time recovery pulse is beyond a measurable range, and if the voltage amplitude of the real-time recovery pulse is beyond the measurable range, adjusting the voltage correspondingly to enable the voltage amplitude of the real-time recovery pulse fall into the measurable range; and judging whether the influence of the current voltage of a Y capacitor on the real-time recovery pulse can be neglected, and if the influence of the current voltage of the Y capacitor on the real-time recovery pulse can be neglected, determining a shortest pulse signal time for completing insulation detection, taking the time as the pulse time period of the current injection pulse, inputting an injection pulse corresponding to the pulse time period to the pulse input end, collecting a recovery pulse corresponding to the injection pulse, and calculating the value of insulation resistance according to the injection pulse and the recovery pulse. The insulation detection speed of new energy vehicles can be improved.

Description

Technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a new energy vehicle and an insulation detection method and system thereof. Background technique [0002] At present, the power battery voltage in new energy vehicles far exceeds the personal safety voltage range. When the power battery or the high-voltage system of the vehicle has an insulation performance degradation problem, personal safety will be endangered, and the internal battery module insulation performance degradation of the power battery will cause the power battery Internal failures affect the performance of the entire vehicle. Therefore, it is very important to test the insulation performance of new energy vehicles. [0003] At present, the insulation detection unit in the power battery management system is mainly responsible for monitoring the insulation performance of the high-voltage system of the vehicle. By real-time detection of the insulation resistance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/00G01R27/02
CPCG01R27/025G01R31/006G01R31/12
Inventor 袁正王小玲袁昌荣李宗华周安健
Owner 深蓝汽车科技有限公司
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