Power control system and method for hybrid vehicle

A power control system for a hybrid vehicle, comprising:

• a battery;
• a converter configured to convert a voltage level of the battery;
• first and second inverters connected in parallel to the converter to receive power of the converter;
• a diode having both ends connected to a connection node of the battery and the converter and a connection node of the converter and the first inverter to form a bypass path of the converter;
• a first motor connected to the first inverter and connected to a first gear set of a planetary gear set provided in a transmission system of the hybrid vehicle;
• a second motor connected to the second inverter and a second gear element of the planetary gear set;
• and
• an engine connected to a third gear set of the planetary gear set,
• wherein the second gear element is connected to a driving shaft of the hybrid vehicle, and
• wherein, when the hybrid vehicle is in an electric vehicle (EV) mode, the third gear element is driven intermittently, a switch of the converter is controlled to cause electric power of the high-voltage battery bypassed via the diode to be directly supplied to the second inverter to drive the second motor, torque and speed of the first motor connected to the first gear element are shifted in a direction opposite to that of torque and speed of the second motor as the third gear element is driven intermittently, and power of a first motor is added to power of a second motor.

A power control method of a hybrid vehicle, comprising:

• obtaining, by a controller, a required power of the hybrid vehicle when the hybrid vehicle is in an electric vehicle (EV) mode without driving an engine;
• comparing, by the controller, the required power with a predetermined power limit of a converter configured to convert a voltage level of a battery as a power source for supplying motor driving power;
• and
• stopping, by the controller, conversion of the voltage level through the converter when the required power exceeds the predetermined power limit and directly supplying power of the battery to a first inverter or a second inverter to drive a first motor connected to the first inverter and a second motor connected to the second inverter,
• wherein a switch of the converter is controlled to cause electric power of the battery bypassed to be directly supplied to the first inverter and the second inverter when the conversion of the voltage level through the converter is stopped.