HIGH VOLTAGE BATTERY CHARGING CONTROL

id304000200700


Outline

•  When charging the high voltage battery, it is necessary to pay attention to the safety of the high voltage circuit, the prevention of high voltage battery deterioration, and the charging efficiency. For this reason, the PCM controls the charging according to the vehicle conditions and the high voltage battery.
•  For details on the high voltage battery charging, refer to [CHARGING SYSTEM]. (See CHARGING SYSTEM [(E)].)

Block Diagram

Normal charging

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Quick charging

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Operation

Note
•  The time required to charge the high voltage battery differs depending on the ambient temperature, high voltage battery temperature, state of charge, and years of use. In particular, charging takes longer under conditions in which the high voltage battery temperature and the ambient temperature are low.

Charging start

•  When the charge cable is connected to the charging port, the charging control unit sends a start request signal via CAN communication to start the PCM and related modules. The PCM turns on the high voltage contactor after verifying that the charging circuit and the high voltage circuit is normal. (See CHARGING SYSTEM [(E)].)


During charging

•  When the high voltage contactors are turned on, the PCM sends charging power (during normal charging) signal or a transmission request signal (during fast charging) to the charging system. When the charging system receives this signal, it starts transmitting power for charging.
•  If the charging time is set using the charging timer, the PCM puts the request to the charging system on hold. The body control module (BCM) sends a charging start request to the PCM when the start condition set on the charging timer is met. The PCM sends the request signal to the charging control unit after receiving the charging start request from the body control module (BCM).
•  The PCM sends the requested charging current to the charging control unit based on the amount of current that can be output by the charging system, the high voltage battery temperature, and the power usage by auxiliary devices during charging.
•  During normal charging, the onboard charger converts the AC voltage to DC voltage and regulates the voltage to be the same as the high voltage battery voltage.
•  During charging, the PCM keeps the high voltage battery and the onboard charger at the right temperature by performing the following controls.
―  Battery heater control (See BATTERY HEATER CONTROL.)
―  High voltage battery cooling control (See HIGH VOLTAGE BATTERY COOLING CONTROL.)
―  Cooling fan control (See COOLING FAN CONTROL.)
―  Electric water pump control (See ELECTRIC WATER PUMP CONTROL.)
•  The PCM displays the charging or charging completed status on the charging indicator. (See CHARGE INDICATOR CONTROL.)


Charging end

•  The PCM determines that the charging has ended when any of the following conditions is detected.
―  The charge on the high voltage battery exceeds the target charge (when fully charged or reaches the set charge level).
―  The charging system malfunctions, the charging system outlet is disconnected, or the charging system emergency stop button is pressed.
―  EV system malfunction is detected.
―  User performs a charging stop operation remotely (when Connected Service is enabled).
•  If the PCM determines that the charging has ended, it gradually reduces the charging current requested to the charging system and sends a charging stop to the charging system.
•  After sending the charging stop to the charging device, the PCM turns off the high voltage contactor, cuts off the high voltage circuit, and stops the operation of the modules operated for charging. (See CHARGING SYSTEM [(E)].)
•  To ensure safety while charging, if the PCM detects that the user has performed the following operations, charging is stopped.
―  EV system start operation
―  Selector lever shifted to a position other than P
―  Charging cable disconnected