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US 9,303,650 B2Granted
Introduction of exhaust gas recirculation at a compressor blade trailing edge
AssigneeFord Global Technologies, LLC
InventorsJoseph Norman Ulrey, Keith Michael Plagens, Gregory Patrick McConville, Daniel Joseph Styles
Life of this patent
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Abstract
Methods and systems are provided for injecting exhaust gases from an exhaust gas recirculation system proximate to a trailing edge of a compressor wheel of a compressor. In one example, a compressor of a turbocharger may include an exhaust gas recirculation inlet volute within a casting of the compressor. The exhaust gas recirculation inlet volute may include an injection port positioned downstream of the trailing edge of the compressor wheel for injecting exhaust gases into intake air flow.
Claims17
A compressor of a turbocharger, comprising:
- a compressor wheel rotatable about a central rotational axis of the compressor;
- a volute positioned within a casting of the compressor and including a diffuser;
- and
- an exhaust gas recirculation inlet volute positioned within a backplate of the compressor, the exhaust gas recirculation inlet volute having an injection port coupled to the diffuser downstream of a trailing edge of the compressor wheel, where both the volute and the exhaust gas recirculation inlet volute are circular passages with a circular cross-section area and a passage diameter that change along a length of each volute as each volute wraps around the central rotational axis of the compressor, where the exhaust gas recirculation inlet volute is positioned on an opposite side of the diffuser from the volute, where the injection port is a curved slot between the exhaust gas recirculation inlet volute and the diffuser, and downstream of the trailing edge, where the curved slot curves from the exhaust gas recirculation inlet volute to the diffuser in an airflow direction, the curved slot extending around a circumference of the compressor wheel, and where the curved slot curves outward from a main passageway of the exhaust gas recirculation inlet volute, in a direction relative to the central rotational axis.
1 more element
A compressor of a turbocharger, comprising:
- a compressor casting including a volute, the volute coupled to a diffuser;
- a compressor wheel rotatable about a central axis of the compressor, the compressor wheel including a compressor blade;
- and
- an exhaust gas recirculation inlet volute positioned within the compressor casting on a same side of the diffuser as the volute, the exhaust gas recirculation inlet volute having an injection port coupled to the diffuser downstream of a trailing edge of the compressor blade but upstream of an end of the diffuser proximate to the volute, where an outer edge of the exhaust gas recirculation inlet volute that faces opposite the injection port is positioned further inboard than an outer edge of the volute that faces opposite the diffuser, relative to a center of the turbocharger, where the center is positioned between the compressor and a turbine of the turbocharger;
- wherein the exhaust gas recirculation inlet volute is a circular passage with a circular cross-section area, a passage diameter, and a central axis, the central axis of the exhaust gas recirculation inlet volute curving around an inlet conduit of the compressor at an inside edge of the volute.
2 more elements
A method, comprising:
- delivering exhaust gas recirculation (EGR) to an EGR inlet volute arranged in a backplate of a compressor in an engine intake, the EGR inlet volute separated from an intake volute positioned in a casting of the compressor, the intake volute having a diffuser, the EGR inlet volute having an injection port coupled to the diffuser opposite the intake volute and downstream of a trailing edge of a compressor blade of the compressor, where the EGR inlet volute is a circular passage with a circular cross-section area and a diameter that both decrease as the circular passage wraps around a central axis of the compressor from an inlet of the circular passage positioned outside of the backplate to a second end of the circular passage positioned at the backplate, and where the injection port is a curved slot extending around a circumference of the compressor blade, the curved slot curving in an air flow direction, and where the curved slot curves outward from a main passageway of the EGR inlet volute, in a direction relative to the central axis of the compressor.
Dependencies are inferred from the claim text.