AN OPEN CIRCUIT VOLTAGE DETERMINATION DEVICE OF VEHICLE USING 42 VOLTAGE POWER SYSTEM AND METHOD THEREOF

摘要

In vehicles with a 42V power system, detection of open circuit voltage (OCV) for a 36V battery is required to provide precision in the management and control of a state of charge (SOC) for a 36V battery when an engine is started. In that,;A first battery that stores power of 36V and is responsible for a 42V load power supply and supplies a starting current at engine start-up; a second battery that is responsible for a 14V load power supply and is charged by the power of the first battery; The inverter converts the DC voltage of the first battery into a three-phase voltage to start the ISG, converts the voltage generated by the ISG into DC, and supplies the charged voltage to the first battery as a charging voltage, and the amount of the first battery. Directly connected to the terminal, operated by the power source of the first battery, and includes a BMS that manages the overall SOC for the first battery, is configured in the BMS, for the detection of no-load voltage at the start-up of the engine After the control and the detection of the no-load voltage, control is performed to prevent the initial inrush current flowing into the capacitor in the inverter, and to control charging when the engine is normally started. A processor that executes control, and is connected in parallel to one terminal of the first battery and connected to the inverter, and switched according to a control signal applied from the processor to control the power supply line between the first battery and the inverter; And a resistor disposed between the second relay and the first relay and the inverter to limit the current of the first battery supplied to the inverter through the first relay.;42V power system, BMS, SOC, no-load voltage