Abstract: A system includes a plurality of sensors configured to sense an opening/closing of a door, fastening/unfastening of a seat safety belt, and change in a vehicle height; a first processor configured to determine the number of all occupants in the vehicle by the opening/closing of the door, the fastening/unfastening of the seat safety belt, and the change in the vehicle height sensed by the plurality of sensors and preliminarily determine an internal circulation ratio of the air conditioning system according to the determined number of all occupants in the vehicle; a second processor configured to adjust the internal circulation ratio which is preliminarily determined by the first processor according to at least one of a sound intensity and a sound duration time in the vehicle; and a controller configured to control the air conditioning system according to the adjusted internal circulation ratio.

Abstract: A refrigerant amount monitoring and charging control system for an electric vehicle and a method thereof include: a controller; a battery management module electrically connected to the controller; a high-speed charging gun connected to the vehicle when the vehicle is charged and configured to generate a high-speed charging signal during performing high-speed charging and to send the high-speed charging signal to the controller; an ambient temperature sensor electrically connected to the controller and configured to obtain an ambient temperature and to send the obtained ambient temperature to the controller; and a chiller including an electronic expansion valve and an evaporator. A situation where a vehicle battery is unable to be cooled by a refrigerant due to an insufficient refrigerant amount may be prevented by controlling charging power based on a monitoring result of a current refrigerant amount.