METHOD AND SYSTEM FOR VARIABLY ADJUSTING VOLTAGE OF LDC FOR HYBRID VEHICLE

摘要

A method and system are provided for variably adjusted voltage of the LDC applied with an IBS (Intelligent Battery Sensor). The LDC output voltage control mode is determined in each of three driving modes, and the high electric loads are separated into two or more groups. The LDC output voltage value and the order priority are differentiated based on the durability of the auxiliary battery. Additionally, an LDC output voltage order table is generated according to the driving mode and the SOC state based on the auxiliary battery SOC information obtained from an IBS. Thus, consumed energy of the LDC and an energy consumption amount of the auxiliary battery are minimized, thus improving fuel efficiency.

主权项

1. A method for variably adjusting voltage of a low voltage direct current-direct current converter (LDC) for a hybrid vehicle, the method comprising:
determining, by a controller, an LDC output voltage control mode for each three driving modes including an electric vehicle (EV) mode, an engine charge mode, and a regenerative braking mode; separating, by the controller, high electric loads into two or more groups and determining LDC output voltage based on a voltage consumption amount of each of the groups; and variably adjusting, by the controller, the LDC output voltage by generating a LDC output voltage order table based on temperature information of the auxiliary battery and state of charge (SOC) information sensed by an intelligent battery sensor (IBS) mounted on a terminal of the auxiliary battery.