Patent ID: 8070416

Claim:
A turbocharger for an internal combustion engine, comprising: a compressor having a compressor chamber for receiving fluid flow; a flow regulation mechanism disposed in the compressor, comprising: a diffuser cover moveably disposed in a diffuser passage to selectively permit and at least partially impede the fluid flow through the diffuser passage; a recirculation gate moveably disposed in the compressor chamber to selectively close and open a recirculation groove from fluid communication with the compressor chamber; wherein when there is a high fluid velocity in the compressor chamber, the fluid flow is substantially permitted through the diffuser passage by the diffuser cover and the recirculation gate is closed, and wherein when there is a low fluid velocity in the compressor chamber, the diffuser cover is moved to at least partially impede fluid flow and the recirculation gate is opened to allow fluid flow through the recirculation groove.