Control apparatus for variable displacement compressor

A displacable compressor including a swash plate tiltably mounted on a rotary shaft in a crank chamber to reciprocally drive a piston in a cylinder bore, said piston compressing fluid supplied to the cylinder bore from a fluid passage through a suction passage and discharging the compressed fluid to the fluid passage through a discharge passage, wherein the difference between the pressures in the crank chamber and the cylinder bore is selectively increased and decreased in accordance with pressure in the crank chamber to tilt the swash plate between minimum and maximum angles, said compressor comprising:

• means for determining an amount of the fluid passing through one of the suction passage and the discharge passage to be minimum based on the compression load of said compressor;
• means for forcibly tilting the swash plate toward the minimum angle in response to an instruction from the determining means;
• means for regulating the tilting movement of the swash plate as it tilts to the minimum angle, said swash plate at the minimum angle being inclined toward the maximum angle with respect to a plane perpendicular to said rotary shaft to allow the passage of the minimum amount of the fluid in one of the passages;
• and
• means disposed in one of said suction passage and said discharge passage to close said one of the passages upon the passage of the minimum amount of the fluid therein.