Turbocharger incorporating an integral pump for exhaust gas recirculation
AssigneeAllied-Signal Inc.
InventorSteven Don Arnold
Life of this patent
Estimating the term…
Abstract
A turbocharger with an integral Exhaust Gas Recirculation system for an internal combustion engine having a compressor rotor with two sets of vanes on opposite sides of the rotor disk for compression of charge air and recirculated exhaust gas. The charge air and recirculated exhaust gas streams are segregated in the turbocharger and an inlet and an outlet volute for the recirculated exhaust gas is integral with the turbocharger center housing. A variable geometry turbine inlet is provided for exhaust backpressure and fuel air mixture control and an integral exhaust gas bypass for recirculating EGR is controlled by an integral valve mounted with the turbine housing.
Claims10
A turbocharger incorporating an integral Exhaust Gas Recirculation (EGR) pump comprising:
- a turbine housing including an exhaust gas inlet and an exhaust gas outlet;
- a turbine driven by exhaust gas received through the exhaust gas inlet and connected to a rotatable shaft;
- a center housing supporting a bearing assembly which receives the rotatable shaft, the center housing including means for connection to the turbine housing;
- a compressor housing having an air inlet and a charge air outlet;
- a compressor rotor attached to the rotatable shaft, the rotor having a first vane set receiving air through the compressor housing inlet and discharging compressed air to the charge air outlet, the rotor having a second vane set integrally mounted on the rotor opposite the first vane set and receiving exhaust gas from an EGR inlet and discharging compressed exhaust gas through a diffuser to an EGR outlet, the EGR outlet and charge air outlet comprising separate flow paths;
- a baffle for segregating the flow paths at the rotor circumference to separate the flow paths of the exhaust gas and charge air, said baffle having at least one step seal adapted for cooperative interaction with the compressor rotor;
- means for attaching the EGR outlet to a mixer;
- and
- means for attaching the charge air outlet to the mixer.
A turbocharger incorporating a integral Exhaust Gas Recirculation (EGR) pump comprising:
- a turbine housing including an exhaust gas inlet and a turbine outlet;
- a variable geometry nozzle integral to the turbine housing receiving exhaust gas from the exhaust gas inlet, said variable nozzle adjustable to control exhaust gas backpressure;
- a turbine driven by exhaust gas received through the variable geometry nozzle and connected to a rotatable shaft;
- a center housing, supporting a bearing assembly which receives the rotatable shaft, the center housing including means for connection to the turbine housing;
- a compressor housing having an air inlet and a charge air outlet;
- a compressor rotor attached to the rotatable shaft, the rotor having a first vane set receiving air through the compressor housing inlet and discharging compressed air to the charge air outlet, the rotor having a second vane set integrally mounted on the rotor opposite the first vane set and receiving exhaust gas from an EGR inlet and discharging compressed exhaust gas through a diffuser to a recirculated exhaust gas outlet, the recirculated exhaust gas outlet and charge air outlet comprising separate flow paths;
- means for segregating the flow paths at the rotor circumference to separate the flow paths of the recirculated exhaust gas and charge air;
- means for attaching the recirculated exhaust gas outlet to a mixer;
- and
- means for attaching the charge air outlet to the mixer.
Dependencies are inferred from the claim text.