Electric leakage detection method of electric vehicle load

Abstract

The invention relates to an electric leakage detection method of an electric vehicle load. The electric vehicle consists of a power battery, N load loops, an electric leakage detection unit, and a power management unit. A main loop control switch and a load that are connected in series are arranged in each load loop; and pre-charging units are connected in parallel at the two ends of the main loop control switch. The pre-charging units include pre-charging resistors and pre-charging switches that are connected in series. The N is an integer larger than 1. In addition, the electric leakage detection method comprises: the main loop control switches in the N load loops are turned off successively; and the power management unit determines whether electric leakage occurs at a current load loop by detecting whether an electric leakage signal sent by the electric leakage detection unit is received. According to the electric leakage detection method, because the pre-charging units are arranged in all load loops and the main loop control switches in the N load loops are turned off successively to detect whether electric leakage occurs at each load loop, the load with electric leakage in a certain load loop can be determined specifically, so that the manual checking and repairing time is reduced.

Description

technical field [0001] The invention relates to a leakage detection method for electric vehicle loads. Background technique [0002] Such as figure 1 As shown, multiple loads on the electric vehicle (such as load 1, load 2, load 3, and load 4) are connected in parallel at both ends of the power battery, and all load circuits are connected to the power battery through the main circuit control switch (such as switch S2). Generally, a negative switch S3 is also set at the negative pole of the power battery. In the load circuit, there is generally a pre-charging unit, such as figure 1 As shown, the pre-charging unit includes a pre-charging resistor R and a pre-charging switch S1 connected in series, and the pre-charging unit is connected in parallel with the main circuit control switch S2. The power management unit of the electric vehicle is connected to all switches (S1 to S3) and controls the closing or opening of all switches. In order to detect whether the load is leakin...

AI Technical Summary

Problems solved by technology

[0003] In the leakage detection method above, when the leakage sensor detects a leakage, the power management unit can disconnect the main circuit control switch and the negative switch according to the leakage signal detected by the leakage sensor, but it cannot determine which load is leaking and cannot be connected to high voltage, and manual maintenance is required , judging that the load is abnormal

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