Abstract:
An air conditioning system for motor vehicles includes a temperature door configured to adjust an opening degree of a hot air path, a PTC heater configured to heat an air introduced into the hot air path, and a control unit configured to control an opening position of the temperature door with respect to the hot air path and to secure a minimum opening degree of the hot air path, so that a minimum amount of air is blown toward the PTC heater regardless of the opening position of the temperature door. The control unit is configured to actively adjust the minimum opening degree of the hot air path depending on an on/off condition of the PTC heater.
Abstract:
An air conditioning system for motor vehicles includes a blower configured to blow an air into a vehicle room, a PTC heater configured to heat the air blown into the vehicle room, the PTC heater having a heat generation amount adjusted by PWM duty ratio control, a blower air volume change amount measurement unit configured to, when an air volume of the blower is changed, measure a blower air volume change amount per unit time during a predetermined time period from a time point at which the air volume of the blower is changed, and a control unit configured to, when the air volume of the blower is changed, correct a PWM duty ratio of the PTC heater in view of the blower air volume change amount per unit time measured by the blower air volume change amount measurement unit.
Abstract:
An air conditioning system for motor vehicles includes a temperature door configured to adjust an opening degree of a hot air path, a PTC heater configured to heat an air introduced into the hot air path, and a control unit configured to control an opening position of the temperature door with respect to the hot air path and to secure a minimum opening degree of the hot air path, so that a minimum amount of air is blown toward the PTC heater regardless of the opening position of the temperature door. The control unit is configured to actively adjust the minimum opening degree of the hot air path depending on an on/off condition of the PTC heater.
Abstract:
An air conditioning system for motor vehicles includes a blower configured to blow an air into a vehicle room, a PTC heater configured to heat the air blown into the vehicle room, the PTC heater having a heat generation amount adjusted by PWM duty ratio control, a blower air volume change amount measurement unit configured to, when an air volume of the blower is changed, measure a blower air volume change amount per unit time during a predetermined time period from a time point at which the air volume of the blower is changed, and a control unit configured to, when the air volume of the blower is changed, correct a PWM duty ratio of the PTC heater in view of the blower air volume change amount per unit time measured by the blower air volume change amount measurement unit.