Patent ID: 8117841

Claim:
A wastegate valve actuator for controlling the position of a wastegate valve for a turbocharger of an internal combustion engine, the waste gate valve actuator comprising: a first housing defining a first closed chamber sealed at one end with a first diaphragm, the first housing having a boost pressure inlet in fluid communication with the first closed chamber, the first diaphragm adapted to be coupled to the wastegate valve to control the position of the wastegate valve in reaction to movement of the first diaphragm; a second housing defining a second closed chamber sealed at one end with a second diaphragm, the second housing having an intake manifold pressure inlet in communication with the second closed chamber; and an intake manifold pressure communicator located between the first and second housing, the intake manifold pressure communicator coupled to the second diaphragm and communicating a force to the first diaphragm in reaction to movement of the second diaphragm.