PURPOSE: To reduce the fluctuation of temperature through a controller for an automatically controlled air conditioner for an automobile, by performing proportional calculation when the temperature of the rider room of the automobile is stable and not approaching an aimed level, and by adding a temperature deviation integration term when the room temperature is stably approaching the aimed level, to control the air conditioner.
CONSTITUTION: A microcomputer 24 receives a set temperature 25, the temperature 26 of outside air, the temperature 27 of inside air, the quantity 28 of insolation, the outlet temperature 29 of an evaporator, the temperature 30 of water and the degree 31 of opening of an air mix damper. The microcomputer 24 compares the absolute value of the difference between an actual temperature and an aimed level, with a positive constant K6. If the absolute value is not higher than the constant K6, an integration term I is compared with a positive constant K7. If the integration term I is not higher than the constant K7, a new integration term is determined on the basis of the room temperature 27 and the set temperature 25. The blowoff temperature Ta0 of an air duct 1 is calculated from the input data 25W28 and the new integration term. If the absolute value is higher than the constant K6, the integration term I is made zero in calculating the blowoff temperature Ta0. As a result, the deviation of the temperature is not let remain, and the fluctuation of the temperature is reduced.
KAWAI TAKAMASA
AOKI TAKASHI
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