Patent ID: 6931873

Claim:
An air conditioner for a vehicle comprising: an electric compressor; a target rotation speed calculating means that calculates a target rotation speed of the electric compressor; a noise level detecting means that detects a noise level of the vehicle; an upper limit setting means that sets an upper limit of a rotation speed of the compressor to a predetermined value when the detected noise level is lower than a predetermined noise level; and a compressor rotation speed control means for controlling a rotation speed of the compressor based on one of the calculated target rotation speed and the upper limit of the rotation speed, whichever is lower, wherein when the target rotation speed is higher than the upper limit and the detected noise level is reduced from a level that is equal to or higher than the predetermined level to a level that is lower than the predetermined level, the compressor rotation speed control means controls the electric compressor to stop for a predetermined period of time and subsequently increase rotation speed to the upper limit.