Hyundai Motor Company

Kia Motors Corporation

Hwan Hwang

Dong Jun Shin

Jun Yeon Park

Soung Han Noh

Chang Ryeol Yoo

Ho Joong Lee

Yong Kak Choi

Chang Ryeol Ryu

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.

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

A low power DC-DC converter (LDC) control circuit is provided and includes a detector, a storage, and an LDC. The detector detects an output voltage of the LDC and characteristic factors in a vehicle. The storage receives the characteristic factors and cumulatively stores the characteristic factors. The LDC controller initializes the characteristic factors cumulatively stored in the storage when a state of charge (SOC) of a battery of the vehicle is maintained to a preset value for a preset time while the LDC output voltage is maintained to be the same as in a refresh operation.

Circuit for controlling low power DC-DC converter of hybrid vehicle and method for controlling low power DC-DC converter

A system and method for controlling a low-voltage DC-DC converter (LDC) voltage of a hybrid vehicle are provided. The LDC voltage is optimally adjusted based on which driving mode the vehicle enters, thereby improving fuel efficiency. The method includes determining whether the hybrid vehicle is driven in a regenerative braking mode and whether a value of a state of charge (SOC) of an auxiliary battery is equal to or greater than a first critical value set as a value when charging of the auxiliary battery is unnecessary during the driving in the regenerative braking mode. When the value of the SOC of the auxiliary battery is equal to or greater than the predetermined first critical value, the driving mode is switched from the regenerative braking mode to an electric vehicle (EV) mode, and to variably adjust an LDC target voltage in the EV mode.

System and method for controlling LDC voltage of hybrid vehicle

A method and system are provided for variably adjusted voltage of the LDC applied with an IBS (Intelligent Battery Sensor). The LDC output voltage control mode is determined in each of three driving modes, and the high electric loads are separated into two or more groups. The LDC output voltage value and the order priority are differentiated based on the durability of the auxiliary battery. Additionally, an LDC output voltage order table is generated according to the driving mode and the SOC state based on the auxiliary battery SOC information obtained from an IBS. Thus, consumed energy of the LDC and an energy consumption amount of the auxiliary battery are minimized, thus improving fuel efficiency.

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Gyeonggi-do, South Korea

Hwan Hwang