System and method for periodically charging sub-battery for an electric vehicle based on the SOC discharge rate
First Claim
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1. A method for periodically charging a sub-battery for an electric vehicle, consisting of:
- a first step of calculating, by a controller, a State of Charge (SOC) discharge rate of the sub-battery after charging the sub-battery by compulsory driving a Low Voltage DC-DC Converter (LDC) and discharging the sub-battery, which has been charged by the compulsory driving of the LDC, into a reference electronic load value;
thereafter, a second step of setting, by the controller, the LDC output voltage and a charging time of the sub-battery using the SOC discharge rate of the sub-battery and information received from an Intelligent Battery Sensor (IBS);
a third step of determining, by the controller, whether or not an SOC of a main battery is equal to or greater than a set value; and
thena fourth step of performing, by the controller, periodic charging of the sub-battery through an operation of an LDC when the SOC of the main battery is equal to or greater than the set value.
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Abstract
Provided is a system method for periodically charging a sub-battery for an electric vehicle. In this method, an SOC self-discharge rate of the sub-battery is calculated. An LDC output voltage and a charging time of the sub-battery are set using the SOC self-discharge rate of the sub-battery and information received from an IBS. It is determined whether or not an SOC of a main battery is equal to or greater than a set value. Periodic charging is performed on the sub-battery through an operation of an LDC when the SOC of the main battery is equal to or greater than the set value.
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11 Claims
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1. A method for periodically charging a sub-battery for an electric vehicle, consisting of:
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a first step of calculating, by a controller, a State of Charge (SOC) discharge rate of the sub-battery after charging the sub-battery by compulsory driving a Low Voltage DC-DC Converter (LDC) and discharging the sub-battery, which has been charged by the compulsory driving of the LDC, into a reference electronic load value; thereafter, a second step of setting, by the controller, the LDC output voltage and a charging time of the sub-battery using the SOC discharge rate of the sub-battery and information received from an Intelligent Battery Sensor (IBS); a third step of determining, by the controller, whether or not an SOC of a main battery is equal to or greater than a set value; and
thena fourth step of performing, by the controller, periodic charging of the sub-battery through an operation of an LDC when the SOC of the main battery is equal to or greater than the set value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification