System and method of controlling low-voltage DC/DC converter for electric vehicle

摘要

A system and method of controlling a low-voltage DC/DC converter for an electric vehicle that include a battery sensor that senses information regarding a low-voltage battery during a stop of the electric vehicle for each first period when the electric vehicle stops and a controller that operates a low-voltage DC/DC converter to charge the low-voltage battery for a predefined time when an error occurs in the battery sensor. In addition, the controller determines a charge time of the low-voltage battery based on first SOC values of the information regarding the low-voltage battery sensed for each first period when no error in the battery sensor is detected and operates the low-voltage DC/DC converter for the determined charge time to charge the low-voltage battery.

主权项

1. A method of controlling a low-voltage DC/DC converter for a vehicle, comprising:
sensing information, by a battery sensor, regarding a low-voltage battery during a stop of the vehicle for each first period when the vehicle stops; sensing information, by the battery sensor, of the low-voltage battery during driving of the vehicle; operating, by a controller, a low-voltage DC/DC converter to charge the low-voltage battery for a predefined time when an error occurs in the battery sensor to sense the information of the low-voltage battery during the stop of the vehicle; determining, by the controller, a charge time of the low-voltage battery based on first SOC values of the information regarding the low-voltage battery sensed for each first period when error in the battery sensor is not detected; operating, by the controller, the low-voltage DC/DC converter for the determined charge time to charge the low-voltage battery; determining, by the controller, target voltage values of the low-voltage DC/DC converter based on second state of charge (SOC) values and battery liquid temperature values of the information regarding the low-voltage battery during the driving of the vehicle; and operating, by the controller, the low-voltage DC/DC converter based on the determined target voltage values, wherein in the operating of the low-voltage DC/DC converter, the determination of the target voltage values is performed using a first target voltage table that includes voltage values of the low-voltage DC/DC converter which are respectively defined in advance with respect to the low-voltage battery SOC values and the battery liquid temperature values to increase a mileage of the vehicle by one charge, wherein in the first target voltage table, when the low-voltage battery SOC values are in a range of about 80 to 90% and the battery liquid temperature values are in a range of about 0 to 40° C., the predefined voltage values of the low-voltage DC/DC converter are within a range of about 12.2 to 13.2V, and wherein the controller includes a memory configured to store program instructions and a processor configured to execute the program instructions.