Patent ID: 6537037
Filing Date: 2003-03-25
Classification: F04B,Y10T

Abstract:
A variable displacement compressor, the displacement of which varied in a range including a minimum displacement and a maximum displacement, comprising:an acquiring device for acquiring a target value used for controlling the compressor displacement; a switching device that compares the target value with a predetermined reference value and switches an operational mode in accordance with the result of the comparison such that the displacement that corresponds to the target value results in a coefficient of performance that is equal to or greater than a predetermined level of a coefficient of performance; an actuator for varying the displacement in accordance with at least an instruction from the switching device; and the switching device permits the actuator to perform a displacement control procedure for achieving the target value if the displacement corresponding to the target value is equal to or greater than a threshold displacement value corresponding to the reference value, and the switching device forces the actuator to perform the minimum displacement operation, regardless of the target value, if the displacement corresponding to the target value is smaller than the threshold displacement value.