CHARGING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Hybrid Vehicle Control ECU Assembly

    • Detects the electrical load caused by certain electrical components.

    • Calculates the request voltage based on the electrical load caused by certain electrical components and the condition of the auxiliary battery, and sends the request voltage signal to the hybrid vehicle converter assembly (DC-DC converter).

    • Restricts the output voltage of the hybrid vehicle converter assembly (DC-DC converter).
    Hybrid Vehicle Converter Assembly (DC-DC Converter) Receives the request voltage signal sent from the hybrid vehicle control ECU assembly and restricts the output voltage.
    Battery State Sensor Assembly Detects the charge/discharge current, voltage, temperature, SOC (State Of Charge) and self-diagnosis result of the auxiliary battery and sends signals to the hybrid vehicle control ECU assembly.
    Auxiliary Battery Supplies power to the electrical components such as the battery cooling blower assembly, inverter water pump with motor assembly, cooling fan motor , etc. and each ECU.
    Sub-battery ECU Detects the voltage and SOC (state of charge) of the sub-battery. Sends the request voltage signals to the hybrid vehicle control ECU assembly when charge of the sub-battery is necessary for low voltage or low capacity.

  2. SYSTEM CONTROL


    1. Basic Control


      1. Controls the output voltage of the hybrid vehicle converter assembly (DC-DC converter) in accordance with changes in the target SOC to change the SOC of the auxiliary battery to reduce the power consumption.

    2. Constant Voltage Control


      1. In the following situations, basic control is temporarily suspended and constant voltage control is performed.


        1. A certain period of time has elapsed since the power switch is turned on (READY)


          1. In order to compensate for electricity consumed due to parasitic current when the power switch is off, constant voltage control is performed for a certain period of time after the power switch is turned on (READY).

        2. Stable operation of certain electrical components is required


          1. The state of certain electrical components is monitored, basic control is temporarily canceled and constant voltage control is performed when the system determines that operation of the electrical components may become unstable.

        3. Stable use the auxiliary battery


          1. Constant voltage control is performed and the auxiliary battery is fully charged every 20 driving hours to minimize deterioration of the electrode plates due to sulfation.

          2. Constant voltage control is performed when the SOC of the auxiliary battery is low or the temperature of the auxiliary battery is high/low to minimize deterioration of the auxiliary battery.