Patent ID: 7971442
Filing Date: 2011-07-05
Classification: B60H

Abstract:
1. A method for controlling an air conditioner for a vehicle, in which a compressor is controlled by calculating a discharge capacity control value of a pressure control valve of a variable capacity swash type compressor by means of a proportional-integral control, characterized by comprising the steps of: determining if an A/C switch is turned on or not; determining if the temperature of an evaporator directly before turning off the A/C switch reaches a target temperature of the evaporator when the A/C switch is turned on, as a result of determining if the A/C switch is turned on or not; performing a control by outputting the discharge capacity control value of the compressor to a maximum and then performing the proportional-integral control, when the temperature of the evaporator directly before turning off the A/C switch does not reach the target temperature of the evaporator, and determining if a lapse time from the turning off of the A/C switch to the turning on thereof is below a control time when the temperature of the evaporator directly before turning off the A/C switch reaches the target temperature of the evaporator, as a result of determining if the temperature of the evaporator directly before turning off the A/C switch reaches a target temperature of the evaporator when the A/C switch is turned on; performing the control by outputting the discharge capacity control value of the compressor to the maximum and then performing the proportional-integral control, when the lapse time from the turning off the A/C switch to the turning on thereof exceeds the control time, and concurrently performing the proportional-integral control after controlling the pressure control valve by outputting the discharge capacity control value of the compressor directly before turning off the A/C switch, when the lapse time from the turning off of the A/C switch to the turning on thereof is below the control time, as a result of determining if a lapse time from the turning off of the A/C switch to the turning on thereof is below a control time when the temperature of the evaporator directly before turning off the A/C switch reaches the target temperature of the evaporator; determining if the AIC switch is turned off, after performing the proportional-integral control; and storing the discharge capacity control value of the compressor directly before turning off the A/C switch, when the A/C switch is turned off, and concurrently counting and storing the lapse time from the turning off of the A/C switch to the turning on thereof.