Abstract: A axial to rotational motion actuator employs two sets of engaged helical splines on rotational collars provides a large degree of rotary actuation from a relatively short axial stroke to provides efficient non-binding and reduced effort actuator operation. This improved actuation movement makes the actuator assembly both more responsive to a hydraulic activating means, i.e., oil pressure, and enables packaging the actuator assembly in a compact size to optimize available space around a turbocharger and inside of an engine compartment.

Abstract: Turbocharger fatigue life monitors comprise at least one sensor that measures an actual operating condition of the turbocharger, e.g., turbine rotational speed or turbine inlet temperature. The device comprises a central processing unit for receiving information from each sensor and processing the information, using programs and predetermined turbocharger information, e.g., turbocharger material and stress data stored in one or more storage device in communication with the central processing unit, to provide an actual probability of turbocharger failure. The central processing unit compares the calculated probability of turbocharger failure to a predetermined specified probability of turbocharger failure stored in a storage device to determine whether turbocharger service is needed.

Abstract: A turbocharger for internal combustion engines having a valve mount cast or machined integral with the compressor housing and disposed along a compressor housing outside surface, the valve including a first air port in communication, through a restriction orifice, with the compressor volute and at least one of a second air port in communication with the first port, and a third port in communication with the compressor air intake. The mount includes attachments for a solenoid valve to the valve mount and a means for forming a leak-tight seal between the solenoid valve and the second and third air ports. A control system for actuating the solenoid allows venting of pressure from the second air port to the third air port for application in controlling a wastegate actuator or disengaging the wategate actuator by venting pressure from the first port to the second port.

Abstract: A variable geometry system for a turbocharger includes a sliding piston disposed within a turbine housing between a primary exhaust gas volute and turbine blades. The sliding piston is axially displaceable within the turbine housing to increase or decrease the volumetric flowrate of exhaust gas to the turbine. The sliding piston is positioned by an actuator having reciprocating movement translated through a rotating sleeve with a first pin engaging a helical slot for axial motion of the piston and a second pin engaging an alignment slot for maintaining axial alignment of the piston.

Abstract: A turbocharger with integrated Exhaust Gas Recirculation (EGR) employs an EGR pump impeller mounted on a common shaft with the turbocharger compressor and turbine. The EGR pump is housed within an EGR extension in the bearing housing adjacent the compressor housing backplate. The recirculation extension includes an exhaust gas outlet for the pumped EGR and an exhaust gas inlet is incorporated in the backplate adjacent the EGR pump impeller.