Method for controlling a power-down detection circuit, controller and computer readable storage media

1. A method for controlling a power-down detection circuit of a vehicle, comprising:

receiving, by a controller of the power-down detection circuit, a power-down signal, wherein the power-down signal is sent from a power-down detection sub-circuit of the power-down detection circuit when it is determined by the power-down detection sub-circuit that an output voltage of a low-voltage side power supply of the power-down detection circuit is smaller than a threshold, and wherein the power-down detection sub-circuit and the controller are powered by the low-voltage side power supply;

controlling, by the controller, a memory of the power-down detection circuit to record fault information, wherein the fault information comprises current information of a high voltage bus sensed by a high-voltage side current sensor of the power-down detection circuit, wherein the high-voltage side current sensor is located in a high-voltage side circuit of the vehicle having the high voltage bus, and wherein the high-voltage side circuit comprises the high-voltage side current sensor, a high-voltage side battery pack and a contact or, wherein the contactor comprises a positive contactor connected to a positive electrode of the high-voltage side battery pack and a negative contactor connected to a negative electrode of the high voltage side battery pack; and

performing, by the controller, a fault diagnosis based on the fault information.

2. The method according to claim 1 , further comprising:

estimating, by the controller, current life of the contactor based on the current information, historical current information and historical power-down times stored by the memory.

3. The method according to claim 1 , further comprising:

sending, by the controller and upon receipt of the power-down signal, a locking instruction to the power-down detection sub-circuit to instruct the power-down detection sub-circuit to lock an output signal of the power-down detection sub-circuit.

4. The method according to claim 3 , wherein after the fault information is recorded, the method further comprises:

sending, by the controller, a first unlocking instruction to the power-down detection sub-circuit to instruct the power-down detection sub-circuit to unlock the output signal.

5. The method according to claim 3 , wherein after the fault information is recorded, the method further comprises:

sending, by the controller, a second unlocking instruction to the power-down detection sub-circuit to instruct the power-down detection sub-circuit to initialize the output signal.

6. The method according to claim 1 , wherein the low-voltage side power supply is obtained by stepping down a voltage of the high-voltage side battery pack through a power supply circuit.

7. A controller of a power-down detection circuit in a vehicle, comprising:

a memory for storing instructions; and

a processor configured to execute the instructions to:

receive a power-down signal, wherein the power-down signal is sent from a power-down detection sub-circuit of the power-down detection circuit when it is determined by the power-down detection sub-circuit that an output voltage of a low-voltage side power supply of the power-down detection circuit is smaller than a threshold, and wherein the power-down detection sub-circuit and the controller are powered by the low-voltage side power supply;

control a memory of the power-down detection circuit to record fault information, wherein the fault information comprises current information of a high voltage bus sensed by a high-voltage side current sensor of the power-down detection circuit, wherein the high-voltage side current sensor is located in a high-voltage side circuit of the vehicle having the high voltage bus, and wherein the high-voltage side circuit comprises the high-voltage side current sensor, a high-voltage side battery pack and a contactor, wherein the contactor comprises a positive contactor connected to a positive electrode of the high-voltage side battery pack and a negative contactor connected to a negative electrode of the high voltage side battery pack; and

perform a fault diagnosis based on the fault information.

8. The controller according to claim 7 , wherein the processor is further configured to execute the instructions to:

estimate current life of the contactor based on the current information, historical current information and historical power-down times stored by the memory.

9. The controller according to claim 7 , wherein the processor is further configured to execute the instructions to:

send, upon receipt of the power-down signal, a locking instruction to the power-down detection sub-circuit to instruct the power-down detection sub-circuit to lock an output signal of the power-down detection sub-circuit.

10. The controller according to claim 9 , wherein the processor is further configured to execute the instructions to:

after the fault information is recorded, send a first unlocking instruction to the power-down detection sub-circuit to instruct the power-down detection sub-circuit to unlock the output signal.

11. The controller according to claim 9 , wherein the processor is further configured to execute the instructions to:

after the fault information is recorded, send a second unlocking instruction to the power-down detection sub-circuit to instruct the power-down detection sub-circuit to initialize the output signal.

12. The controller according to claim 7 , wherein the low-voltage side power supply is obtained by stepping down a voltage of the high-voltage side battery pack through a power supply circuit.

13. A computer-readable storage medium having computer programs stored thereon, the computer programs being executed by a computer to cause the computer to perform the method according to claim 1 .