CHARGING CONTROL METHOD AND SYSTEM FOR ENVIRONMENTALLY FRIENDLY VEHICLE

• US 20150054469A1
• Filed: 12/06/2013
• Published: 02/26/2015
• Est. Priority Date: 08/26/2013
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Jang, Hui Sung, Chun, Shin Hye, Kwak, Mu Shin, Seong, Hyun Wook
• Granted Patent: US 9,352,664 B2
• Time in Patent Office: Days
• US Class Current: 320/162
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A charging control method and system for an environmentally friendly vehicle are provided and promote the enhancement of charging efficiency by improving a power control method of a power factor correction (PFC) converter while a battery is being charged through an on board charger (OBC) in vehicle. The method sensing, by a voltage detector, a battery voltage during charging and calculating, by a controller, a target value to maintain an output voltage of the PFC converter. The target value is calculated from the sensed battery voltage and the maximum available duty value of the DC-DC converter. The output voltage of the PFC converter is maintained, based on the calculated target value.

Claims

1. A charging control method for a vehicle with a built-in on board charger (OBC) including a power factor correction (PFC) converter connected to an AC power source to convert an AC input voltage into a DC voltage and compensate for the power factor of the voltage, and a DC-DC converter for converting the DC voltage output from the PFC converter, the charging control method comprising:

sensing, by a voltage detector, a battery voltage during charging;

calculating, by a controller, a target value to maintain an output voltage of the PFC converter from the sensed battery voltage and the maximum available duty value of the DC-DC converter; and

maintaining, by the controller, the output voltage of the PFC converter, based on the calculated target value.

2. The charging control method of claim 1, further comprising:

sensing, by the voltage detector, an AC input voltage during the charging to compare the calculated target value with the sensed AC input voltage,

maintaining, by the controller, the output voltage of the PFC converter based on the target value, when the calculated target value is a value greater than the sensed AC input voltage.

3. The charging control method of claim 2, further comprising:

maintaining, by the controller, the output voltage of the PFC converter as a value greater than the AC voltage, when the calculated target value is equal to or less than the sensed AC input voltage.

4. The charging control method of claim 3, further comprising:

maintaining, by the controller, the output voltage (Vdc) of the PFC converter to become the value obtained by adding a predetermined margin value (α

) to the maximum value (Vac_max) of the sensed AC input voltage, when the calculated target value is equal to or less than the sensed AC input voltage.

5. The charging control method of any one of claim 4, further comprising:

calculating, by the controller, the target value from the following equation, using the battery voltage and the maximum available duty value of the DC-DC converter;

Vdc_target=K×

Vbat,

wherein Vdc_target represents the target value, K=n/Deff_max, Deff_max represents the maximum available duty value of the DC-DC converter, and n represents the number of coil turns of a transformer in the DC-DC converter.

6. The charging control method of claim 1, further comprising:

maintaining, by the controller, the output voltage of the DC-DC converter as the maximum available duty while the output voltage of the PFC converter is maintained, based on the calculated target value.

7. A charging control system for a vehicle with a built-in on board charger (OBC) including a power factor correction (PFC) converter connected to an AC power source to convert an AC input voltage into a DC voltage and compensate for the power factor of the voltage, and a DC-DC converter for converting the DC voltage output from the PFC converter, the charging control system comprising:

a memory configured to store program instructions; and

a processor configured to execute the program instructions, the program instructions when executed configured to;

calculating, by a controller, a target value to maintain an output voltage of the PFC converter from a sensed battery voltage and the maximum available duty value of the DC-DC converter; and

maintaining, by the controller, the output voltage of the PFC converter, based on the calculated target value.

8. The charging control system of claim 7, wherein the program instructions when executed are further configured to:

maintain the output voltage of the PFC converter based on the target value, when the calculated target value is a value greater than a sensed AC input voltage.

9. The charging control system of claim 8, wherein the program instructions when executed are further configured to:

maintain the output voltage of the PFC converter as a value greater than the AC voltage, when the calculated target value is equal to or less than the sensed AC input voltage.

10. The charging control system of claim 9, wherein the program instructions when executed are further configured to:

maintain the output voltage (Vdc) of the PFC converter to become the value obtained by adding a predetermined margin value (α

) to the maximum value (Vac_max) of the sensed AC input voltage, when the calculated target value is equal to or less than the sensed AC input voltage.

11. The charging control system of claim 10, wherein the program instructions when executed are further configured to:

calculate the target value from the following equation, using the battery voltage and the maximum available duty value of the DC-DC converter;

Vdc_target=K×

Vbat,

wherein Vdc_target represents the target value, K=n/Deff_max, Deff_max represents the maximum available duty value of the DC-DC converter, and n represents the number of coil turns of a transformer in the DC-DC converter.

12. The charging control system of claim 7, wherein the program instructions when executed are further configured to:

maintain the output voltage of the DC-DC converter as the maximum available duty while the output voltage of the PFC converter is maintained, based on the calculated target value.

13. A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:

program instructions that control a voltage detector to sense a battery voltage during charging;

program instructions that calculate a target value to maintain an output voltage of the PFC converter from the sensed battery voltage and the maximum available duty value of the DC-DC converter; and

program instructions that maintain the output voltage of the PFC converter, based on the calculated target value.

14. The non-transitory computer readable medium of claim 13, further comprising:

program instructions that maintain the output voltage of the PFC converter based on the target value, when the calculated target value is a value greater than a sensed AC input voltage.

15. The non-transitory computer readable medium of claim 14, further comprising:

program instructions that maintain the output voltage of the PFC converter as a value greater than the AC voltage, when the calculated target value is equal to or less than the sensed AC input voltage.

16. The non-transitory computer readable medium of claim 15, further comprising:

program instructions that maintain the output voltage (Vdc) of the PFC converter to become the value obtained by adding a predetermined margin value (α

) to the maximum value (Vac_max) of the sensed AC input voltage, when the calculated target value is equal to or less than the sensed AC input voltage.

17. The non-transitory computer readable medium of claim 16, further comprising:

program instructions that calculate the target value from the following equation, using the battery voltage and the maximum available duty value of the DC-DC converter;

Vdc_target=K×

Vbat,

wherein Vdc_target represents the target value, K=n/Deff_max, Deff_max represents the maximum available duty value of the DC-DC converter, and n represents the number of coil turns of a transformer in the DC-DC converter.

18. The non-transitory computer readable medium of claim 13, further comprising:

program instructions that maintain the output voltage of the DC-DC converter as the maximum available duty while the output voltage of the PFC converter is maintained, based on the calculated target value.