| 摘要 |
PURPOSE:To make it possible to stably perform the control of an air-conditioning system operated under proportional-plus-integral control even if the ventilated air volume of the air- conditioning system varies, by providing the air-conditioning system with a constant changing means for changing both the proportional constant and integral constant in accordance with the detected value of the ventilated air volume. CONSTITUTION:A subtracting unit 14' delivers the deviation of a room temperature thetar from a set value thetars to a scale-factor element 15 and a multiplier 19. The scale-factor element 15 multiplies the deviation by a proportional constant alpha, while the multiplier 19 delivers the deviation as an integrated value to an integrator 20 so that the deviation, thetars-thetar is integrated therein. The integrated value is then added to the output value from the scale-factor element 15 in an adder 21 to form a control signal X for P1 operation in accordance with the deviation, thereby an air mixing door is controlled. Further, a scale-factor element 16 multiplies the output value GV of a ventilated air volume sensor 13 by alphaCp/C, (where Cp is the specific heat of air and C is the heat capacity of a vehicle compartment) and an adder 18 adds the thus multiplied value to the output value of a scale-factor element 17 which is obtained by multiplying a constant voltage Vcc by a constant. The output value of the adder 18 is multiplied by the deviation in the multiplier 19, thereby the integrated value including the variation of the ventilated air volume is obtained. Accordingly, the proportional constant and integral constant can be optimized in accordance with the ventilated air volume. |
