System and method for controlling air conditioner for vehicles

A system for controlling an air conditioner for vehicles comprising:

• a sensor configured to sense surface temperature of a passenger sitting part of a rear seat of a vehicle;
• a reference temperature estimation processor configured to estimate surface temperature of a passenger non-sitting part of the rear seat as a reference temperature using temperature change due to heat transfer through convection of indoor air and temperature change due to a quantity of solar radiation;
• a passenger boarding recognition processor configured to compare the surface temperature of the passenger sitting part sensed by the sensor, with the reference temperature estimated by the reference temperature estimation processor and to judge that a passenger is seated on the rear seat when a difference between the surface temperature of the passenger sitting part and the reference temperature exceeds a critical value;
• an air conditioner operation controller configured to differently control volume and temperature of air discharged from the air conditioner according to a result of judgment as to whether or not a passenger is seated on the rear seat by the passenger boarding recognition processor;
• and
• a reference temperature error removal processor configured to receive feedback of the temperature of the passenger sitting part, sensed by the sensor, and to correct an error between the reference temperature, estimated by the reference temperature estimation device, and an actual measurement temperature,
• wherein the reference temperature is estimated by an equation of:
• T
• s
• ⁡
• (
• n
• )
• =
• (
• 1
• -
• UA
• seat
• MC
• seat
• ⁢
• dt
• )
• ⁢
• T
• s
• ⁡
• (
• n
• -
• 1
• )
• +
• UA
• seat
• MC
• seat
• ⁢
• dtT
• r
• +
• q
• .
• s
• ″
• ⁢
• A
• seat
• ,
• wherein Ts represents an estimated reference temperature of the passenger non-sitting part, UAseat represents a heat transfer coefficient or turning coefficient of rear seat, dt represents a measurement interval, qs represents measured quantity of solar radiation, MCseat represents a heat capacity of the rear seat, Tr represents a measured indoor temperature by an in-car sensor, Aseat represents an area of the passenger non-sitting part, and n represents the number of operations.