Back to results
US 9,871,401 B2Granted
Method and apparatus for controlling low-voltage battery charging
AssigneeHyundai Motor Company
InventorsKyu Il Lee, Boung Ho Min, Sung Gone Yoon
Life of this patent
Estimating the term…
Abstract
A method for controlling low-voltage battery charging may include determining a state-of-charge (SOC) of a low-voltage battery based on a voltage of the low-voltage battery. A base charging voltage is set according to the SOC of the low-voltage battery. A charging voltage of the low-voltage battery is set based on the base charging voltage, a vehicle operation mode, and a SOC of a high-voltage battery.
Claims11
A method for controlling low-voltage battery charging, comprising steps of:
- determining a state-of-charge (SOC) of a low-voltage battery based on a voltage of the low-voltage battery;
- setting a base charging voltage according to the SOC of the low-voltage battery;
- and
- setting a charging voltage of the low-voltage battery based on the base charging voltage, a vehicle operation mode, and a SOC of a high-voltage battery,
- wherein the step of determining the SOC comprises:
- a first step for measuring the voltage of the low-voltage battery after a vehicle starts;
- a second step for measuring the voltage of the low-voltage battery after the first step;
- calculating a voltage slope based on the voltage measured in the first step and second step;
- and
- determining the SOC of the low-voltage battery according to the voltage slope.
7 more elements
A apparatus for controlling low-voltage battery charging, comprising:
- a fuel cell stack for supplying a power to a vehicle driving system;
- a high-voltage direct current converter receiving the power from the fuel cell stack;
- a high-voltage battery receiving the voltage which is stepped down by the high-voltage direct current converter;
- a low-voltage direct current converter, which is connected to a high-voltage bus terminal in between the fuel cell stack and the high-voltage direct current converter, for converting the voltage;
- a low-voltage battery charged with the low voltage converted by the low-voltage direct current converter;
- and
- a controller configured to determine a SOC of a low-voltage battery based on the voltage of the low-voltage battery, to set a base charging voltage according to the SOC of the low-voltage battery, and to set a charging voltage of the low-voltage battery based on the base charging voltage, a vehicle operation mode, and a SOC of the high-voltage battery,
- wherein the controller is configured to determine the SOC by performing:
- a first step for measuring the voltage of the low-voltage battery after a vehicle starts;
- a second step for measuring the voltage of the low-voltage battery after the first step;
- a step of calculating a voltage slope based on the voltage measured in the first step and second step;
- and
- a step of determining the SOC of the low-voltage battery according to the voltage slope.
10 more elements
Dependencies are inferred from the claim text.