CHARGING SYSTEM


  1. SYSTEM CONTROL


    1. This system is controlled by the hybrid vehicle control ECU.

    2. This system controls the voltage in order to maintain the capacity of the auxiliary battery optimal condition, then reduces the power consumption of the vehicle by controlling generated voltage of DC-DC converter.


      1. The hybrid vehicle control ECU detects the electric load (inverter water pump assembly, oil pump with motor assembly, battery cooling blower assembly, engine state, etc.).

      2. The battery sensor (battery state sensor assembly) detects the voltage, current, temperature and capacity of the auxiliary battery and sends a signal to the hybrid vehicle control ECU. Based on the signal, the hybrid vehicle control ECU judges the condition of the auxiliary battery.

      3. Based on the electric load and condition of the auxiliary battery, the hybrid vehicle control ECU calculates the request voltage and sends the request voltage signal to the DC-DC converter.

  2. FUNCTION


    1. The hybrid vehicle control ECU receives signals such as the charging/discharging current detected by the battery sensor (battery state sensor assembly) via LIN communication. Based on the signal, the hybrid vehicle control ECU calculates conditions such as the auxiliary battery capacity.

    2. The battery sensor (battery state sensor assembly) detects the auxiliary battery temperature and sends a signal to the hybrid vehicle control ECU, and the hybrid vehicle control ECU judges the condition to enter constant voltage control mode.

  3. FAIL-SAFE


    1. The hybrid vehicle control ECU stops charging control and the DC-DC converter switches to the constant voltage control mode under the following conditions:

      Conditions Intention
      When auxiliary battery capacity has decreased When the condition of the auxiliary battery is bad, charging control is suspended to prevent a decrease in auxiliary battery charge. If the auxiliary battery temperature is too low or too high, the auxiliary battery capacity and lifespan may decrease.
      When auxiliary battery temperature is low or high

      • When the vehicle cooling system load is high

      • When the engine load is high

      		 To avoid discomfort caused by voltage fluctuations in the power supply (maintain saleability and provide stable power)

      • When a battery sensor (battery state sensor assembly) is malfunctioning

      • When voltage sensing is abnormal

      		 When there is a sensor malfunction, charging control is suspended to prevent a decrease in auxiliary battery charge.
      When there is a LIN communication error between the hybrid vehicle control ECU and battery sensor (battery state sensor assembly) When there is a LIN communication error between the hybrid vehicle control ECU and battery sensor (battery state sensor assembly), charging control is suspended to prevent a decrease in auxiliary battery charge.