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In an electric control method for an automobile air conditioner, a digital computer is utilized to calculate a function required to direct the actual in-car temperature toward a desired value in consideration with various changes of ambient temperature and the calculation is compensated to effective

In an electric control method for an automobile air conditioner, a digital computer is utilized to calculate a function required to direct the actual in-car temperature toward a desired value in consideration with various changes of ambient temperature and the calculation is compensated to effectively reduce a difference between the actual in-car temperature and the desired value when the rate of change of the actual in-car temperature becomes below a predetermined value.

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An electric control method for an automobile air conditioner including an air duct for allowing the flow of air into a passenger compartment of the automobile, an evaporator arranged within said air duct and connected with a refigerant compressor for cooling the air flowing therethrough, a heater ar

An electric control method for an automobile air conditioner including an air duct for allowing the flow of air into a passenger compartment of the automobile, an evaporator arranged within said air duct and connected with a refigerant compressor for cooling the air flowing therethrough, a heater arranged within said air duct for warming a portion of the cooled air flowing through said evaporator into said compartment, an air-blend door arranged between said evaporator and said heater for controlling an amount of the cooled air flowing through said heater and controlling an amount of the cooled air directly flowing into said compartment, and control means for controlling the opening degree of said air-blend door to direct the actual in-car temperature toward a desired temperature, said method comprising the steps of: producing a first electric binary signal indicative of the actual in-car temperature; producing a second electric binary signal indicative of the actual temperature outside the automobile; calculating a value indicative of an estimated temperature required to direct the actual in-car temperature toward the desired temperature by a digital computer programmed to calculate said value from a function describing a desired relationship between the estimated temperature and an in-car temperature in consideration with a temperature outside the automobile, the calculation being performed by using the first and second binary signals; calculating a deviation between the desired temperature and the estimated temperature by said digital computer programmed to calculate the deviation on the basis of the previous calculated value; producing an output signal from said digital computer when the deviation is out of a first predetermined range and ceasing the output signal when the deviation is in the first predetermined range, the output signal being applied to said control means to direct the actual in-car temperature toward the desired temperature; discriminating by said digital computer whether or not a difference between the desired temperature and the actual in-car temperature is in a second predetermined range when the rate of change of the actual in-car temperature is below a predetermined value, said digital computer being programmed to perform the discrimination by using the first binary signal; compensating the estimated temperature to direct the temperature difference into said second predetermined range; and continuously repeating the above sequence of steps for controlling the actual in-car temperature in response to any changes in said electric binary signals.