1 observation method;

When communication interruption or control abnormality occurs in the system, observe whether each module of the system has alarms and whether there are alarm icons on the display screen, and then check the phenomena one by one.

2 Failure recurrence method;

The failures of BMS vehicles with lithium iron phosphate battery packs under different conditions are different. When conditions permit, the failures should be reproduced under the same conditions as much as possible to confirm the problem points.

3 elimination method;

When a similar interference phenomenon occurs in the system, each component in the system should be removed one by one to determine which part is affecting the system.

4 substitution method;

When a module has abnormalities in temperature, voltage, control, etc., change the position of the module with the same number of strings to diagnose the module or wiring harness problem.

5 Environmental inspection method;

When the system fails, such as the system cannot be displayed, we should not rush to carry out in-depth consideration, because often we will ignore some details. First of all, we should look at the obvious things: if it is plugged in? Is the switch turned on? Are all the wires connected? Perhaps the root of the problem lies in it.

6 Procedure upgrade method;

When an unknown fault occurs after the new program is burned, which leads to abnormal system control, the previous version of the program can be burned for comparison to analyze and deal with the fault.

7 data analysis method;

When a control or related failure occurs in the BMS of the lithium iron phosphate battery pack, the BMS stored data can be analyzed.