Patent ID: 8485789

Claim:
A method comprising: determining a target capacity for a scroll compressor having intermeshing scroll members, a motor, a scroll separation system for separating the intermeshing scroll members, and a delayed suction system for releasing pressure from at least one intermediate chamber created by the intermeshing scroll members; comparing the target capacity with a first predetermined capacity range and a second predetermined capacity range, each of the first and second predetermined capacity ranges having an upper capacity range and a lower capacity range; operating the motor at a high speed when the target capacity is within the first predetermined capacity range and at a low speed when the target capacity is within the second predetermined capacity range; operating the scroll separation system according to a first pulse width modulation cyclic ratio, with the delayed suction system deactivated, when the target capacity is within the upper capacity range of the first predetermined capacity range or the upper capacity range of the second predetermined capacity range, the first pulse width modulation cyclic ratio being calculated based on the target capacity, and the high or low speed; and operating the scroll separation system according to a second pulse width modulation cyclic ratio, with the delayed suction system activated, when the target capacity is within the lower capacity range of the first predetermined capacity range or the lower capacity range of the second predetermined capacity range, the second pulse width modulation cyclic ratio being calculated based on the target capacity, and the high or low speed.