Supplementary battery recharging system for vehicle and method of controlling the same

Patent metadata

Field	Value
Publication number	US-10328815-B2
Application number	US-201615219406-A
Country	US
Kind code	B2
Filing date	Jul 26, 2016
Priority date	Dec 15, 2015
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A method of efficiently recharging a supplementary battery of a vehicle can recharge the supplementary battery with power from a main battery. A method of controlling a supplementary battery recharging system includes: acquiring charged current of a supplementary battery; starting a timer when the charged current exceeds a limit range; updating a current limit on the basis of a timer value and temperature information of the supplementary battery; and controlling a target voltage using the updated current limit.

First claim

What is claimed is:

1. A method of controlling a supplementary battery recharging system for a vehicle, comprising the steps of:
acquiring charged current of the supplementary battery;
starting a timer when the charged current exceeds a limit range;
updating a current limit on the basis of a timer value and temperature information of the supplementary battery; and
controlling a target voltage using the updated current limit.

2. The method according to claim 1 , wherein the limit range is acquired by subtracting a predetermined band value from the current limit.

3. The method according to claim 1 , further comprising the step of:
resetting the timer when the charged current is lower than the limit range.

4. The method according to claim 1 , wherein the step of updating the current limit is performed with reference to a predetermined table.

5. The method according to claim 4 , wherein a plurality of tables is provided according to state of charge (SOC) of the supplementary battery.

6. The method according to claim 1 , wherein the step of starting the timer comprises maintaining operation of the timer when the timer has been started.

7. The method according to claim 1 , wherein the step of controlling the target voltage comprises stepping down the target voltage when the charged current exceeds the updated current limit.

8. The method according to claim 1 , wherein the step of controlling the target voltage comprises adjusting the target voltage to a default target voltage when the charged current is lower than the updated current limit.

9. The method according to claim 1 , wherein each of the steps is repeated at a predetermined interval.

10. A non-transitory computer readable medium containing program instructions executed by a processor, the computer readable medium comprising:
program instructions that acquire charged current of a supplementary battery;
program instructions that start a timer when the charged current exceeds a limit range;
program instructions that update a current limit on the basis of a timer value and temperature information of the supplementary battery; and
program instructions that control a target voltage using the updated current limit.

11. A supplementary battery recharging system for a vehicle, comprising:
a supplementary battery;
a low voltage DC-DC converter (LDC) for charging the supplementary battery with power of a main battery;
a supplementary battery sensor for acquiring state information of the supplementary battery; and
an LDC controller for acquiring charged current from the supplementary battery, starting a timer when the charged current exceeds a limit range, updating a current limit on the basis of a timer value and temperature information of the supplementary battery acquired from the supplementary battery sensor, and controlling a target voltage of the LDC using the updated current limit.

12. The supplementary battery recharging system according to claim 11 , wherein the limit range is acquired by subtracting a predetermined band value from the current limit.

13. The supplementary battery recharging system according to claim 11 , wherein the LDC controller resets the timer when the charged current is lower than the limit range.

14. The supplementary battery recharging system according to claim 11 , wherein the LDC controller updates the current limit with reference to a predetermined table.

15. The supplementary battery recharging system according to claim 14 , wherein a plurality of tables is provided according to SOC of the supplementary battery.

16. The supplementary battery recharging system according to claim 11 , wherein the LDC controller maintains operation of the timer when the timer has been started and the charged current exceeds the limit range.

17. The supplementary battery recharging system according to claim 11 , wherein the LDC controller steps down the target voltage when the charged current exceeds the updated current limit.

18. The supplementary battery recharging system according to claim 11 , wherein the LDC controller adjusts the target voltage to a default target voltage when the charged current is lower than the updated current limit.

19. The supplementary battery recharging system according to claim 11 , wherein acquisition of the charged current, comparison of the charged current with the limit range, update of the current limit, and control of the target voltage of the LDC are repeated at a predetermined interval.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Hwang Hwan
• Shin Dong Jun
• Lee Ho Joong
• Park Jun Yeon
• Yoo Chang Ryeol

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/90

  Regulation of charging or discharging current or voltage · CPC title

• H02J7/342 Primary

  The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging (with circuits for polarity protection H02J7/68) · CPC title

• B60L2240/545

  Temperature · CPC title

• B60L58/25

  by controlling the electric load · CPC title