Patent ID: 8585382

Claim:
A compressor comprising: a shell assembly defining a suction pressure region and a discharge pressure region; a first scroll member supported within said shell assembly and including a first end plate having a discharge passage, a first spiral wrap extending from said first end plate and a first modulation port extending through said first end plate; a second scroll member supported within said shell assembly and including a second end plate having a second spiral wrap extending therefrom, said first and second spiral wraps meshingly engaged and forming a series of pockets during orbital displacement of said second scroll member relative to said first scroll member, said first modulation port being in communication with a first of said pockets; and a capacity modulation assembly located within said shell assembly, in communication with said first modulation port and operable in: a full capacity mode with said first modulation port isolated from a suction pressure region of the compressor to operate the compressor at a full capacity; a partial capacity mode with said first modulation port in communication with said suction pressure region to operate the compressor at partial capacity between the full capacity and zero capacity; a first pulse width modulation capacity mode to operate the compressor at a first intermediate capacity between the full capacity and the partial capacity by providing pulse width modulated control of said capacity modulation assembly by switching between the full capacity mode and the partial capacity mode; and a second pulse width modulation capacity mode to operate the compressor at a second intermediate capacity between the full capacity and zero capacity by providing pulse width modulated control of said capacity modulation assembly.