Abstract: A variable geometry turbocharger for an internal combustion engine in which the position of the nozzle ring is adjusted to control the width of an exhaust gas inlet passage. A chamber is defined behind the nozzle ring which communicates with the inlet passage and the pressure within that chamber is monitored. The monitored pressure is used as a control parameter for a mechanism which displaces the nozzle ring. Positioning a sensor in the recess behind the nozzle ring protects the sensor from the relatively more extreme environment within the engine exhaust gas manifold.

Abstract: A turbocompound engine having a power turbine bypass valve and a control module for controlling opening and closing of the bypass valve. The control module opens the bypass valve for various operating conditions, such as at high altitudes, low speed/high load, and transient load conditions for improved engine operation.

Abstract: A turbocharger for a diesel engine 34, wherein combustion air is supplied under pressure to the engine's intake manifold 32 from a centrifugal compressor 20 rotated by a turbine wheel 18 driven by exhaust gas from the engine supplied to inlet volute 44. Exhaust gas from the volute impinges on the turbine wheel after passing between stationary vanes 60 in an annular inlet passage between thin wall 52 and wall 46 of turbine housing 40. In this passage is a thin wall annular flange 64 slotted to fit over the vanes. The flange is part of a thin wall ring 62 stamped from stainless steel movable across the passage to control the inlet area thereof. The ring 62 is movable by actuators 80 (only one shown) having rods 74 connected to the ring. Springs 116 act on the rods 74 to urge the flange 64 towards the wall 46 thus reducing the area of the inlet passage so exhaust gas rushes through the reduced inlet and speeds the turbine and compressor providing at manifold 32 an increased air pressure.

Abstract: The disclosure illustrates a turbocharger wastegate valve comprising a cylindrical chamber connected through a radial inlet to the gas stream upstream of the turbine. High pressure air is selectively directed across the inlet through a nozzle to prevent or permit flow into the chamber which is connected to a point downstream of the turbine. The pressure of the air delivered to the nozzle may be varied to proportion the gases bypassed around the turbine.