AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES

摘要

The present invention relates to an air conditioning system for a vehicle. An objective of the present invention is to quickly compensate for an heating amount of a positive temperature coefficient (PTC) heater when the heating amount of the PTC heater changes according to a change in blowing amount of a blower to improve a heating temperature control speed of the PTC heater and thus improve temperature control speed efficiency in a vehicle. To achieve the objective, the air conditioning system for a vehicle according to the present invention comprises: a blower to suck in internal and external air to blow the air into a vehicle; a PTC heater to heat the air blown into the vehicle and control a PWM duty ratio to control a heating amount; a blower blowing amount change measurement unit to measure a blowing amount change per unit time for a prescribed period of time from a time point when the blowing amount of the air blown from the blower is changed when the blowing amount of the air is changed; and a control unit to correct a PWM duty ratio of the PTC heater by considering the blower blowing amount change per unit time measured by the blower blowing amount change measurement unit when the air blowing amount of the blower is changed.