Air conditioning system for vehicles

Claim 1

An air conditioning system for a vehicle, said vehicle having a compartment and a windowpane, comprising: cooling means for cooling air, said cooling means including a compressor of a variable capacity type; heating means for heating air having passed through said cooling means; damper means for controlling an amount of air flowing from said cooling means toward said heating means and an amount of air flowing from said cooling means and bypassing said heating means; temperature detecting means for detecting a temperature of air within the compartment of the vehicle; means for setting a desired temperature within the compartment of the vehicle; first control means for controlling the capacity of said compressor in relation to a deviation between said detected temperature and said set temperature; second control means for controlling an opening degree of said damper means in relation to said deviation; mist detecting means for detecting a mist on the windowpane of the vehicle; judging means, receiving an output from said mist detecting means, for judging whether or not the windowpane is misted; and first correction means, responsive to an output from said judging means, for increasing the capacity of said compressor by a predetermined amount when it is judged by said judging means that the windowpane is misted; the improvement comprising: second correction means, responsive to an output from said judging means, for correcting the opening degree of said damper means to a position where the amount of air flowing toward said heating means is increased by a predetermined amount when it is judged by said judging means that the windowpane is misted; said predetermined amount by which the opening degree of said damper means is increased by the second correction means being set to such a value as to compensate for an increase in cooling degree due to the increase in the capacity of said compressor, to thereby avoid a sudden change in temperature within the compartment.