AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES

摘要

PURPOSE: A cooling device for a vehicle is provided to minimize a rush current generated while controlling the heat value of a PTC heater and to prevent the damage to and trouble of various electric and electronic components caused by an injection current. CONSTITUTION: A cooling device for a vehicle includes a PTC heater (5) heating air blown inside the vehicle and a heater control unit (7) which controls the heat value of the PTC heater by controlling a duty ratio applied to the PTC heater. The cooling device for a vehicle includes a slew rate control unit (10) which controls a slew rate in order to differentiate the amount of the slew rate when the duty ratio increases with the amount of the slew rate when the duty ratio decreases when increasing or decreasing the duty ratio in order to set the duty ratio applied to the PTC heater as a target value. [Reference numerals] (8) Micom; (9) IGBT element; (AA) Slew rate control unit; (BB) Battery