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Waste Exhaust Energy Recovery from an Engine

IP.com Disclosure Number: IPCOM000201327D
Publication Date: 2010-Nov-10
Document File: 7 page(s) / 52K

Publishing Venue

The IP.com Prior Art Database

Related People

Shamim Imani: INVENTOR

Abstract

An aspect encompasses an engine system wherein a turbocharger is coupled to an internal combustion engine to receive exhaust from the engine and to provide compressed air for combustion to the engine. The turbocharger is driven to generate the compressed air by the exhaust from the engine. An expander/generator is coupled to the turbocharger to receive at least a portion of the compressed air and generate electricity by expanding the compressed air.

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This is the abbreviated version, containing approximately 23% of the total text.

Waste Exhaust Energy Recovery from an Engine


BACKGROUND

[0001]  A turbocharger is a device, driven off the combustion exhaust of an internal combustion engine, that boosts the pressure and throughput of combustion air into the engine.  The turbocharger has a compressor, typically a centrifugal compressor, for compressing the combustion air.  The compressor resides on a common shaft with a turbine, typically a radial or axial turbine, for receiving the combustion exhaust and driving the compressor via the common shaft.  FIG. 1 shows a typical turbocharged engine arrangement having a reciprocating internal combustion engine 12 with an exhaust manifold 14 and a turbocharger 16 coupled to receive exhaust from the manifold 14.  The exhaust passes through the turbine stage of the turbocharger 16 and out an exhaust conduit 18.  A wastegate valve 20 upstream of the turbocharger 16 can be selectively operated to partially bypass the turbocharger 16, directing some of the exhaust directly into the exhaust conduit 18.  The exhaust that passes through the turbine stage of the turbocharger 16 drives the compressor stage to compress ambient air received at the turbocharger 16 and output the compressed air through an intake conduit 22 into the intake of the engine 12.   The compressed air and fuel are combusted in the engine 12 to produce kinetic energy, typically in the form of rotating movement of an output shaft.

SUMMARY

[0002]  The concepts described herein are directed to generating electricity from waste exhaust energy.  In certain instances, an expander/generator recovers exhaust energy that would otherwise be wasted, i.e. exhaust energy bypassed via wastegate valve or exhaust energy used to generate compressed air ultimately vented via the blow-off valve, in the form of excess compressed air and expands the excess compressed air to generate electricity.

[0003]  An aspect encompasses an engine system wherein a turbocharger is coupled to an internal combustion engine to receive exhaust from the engine and to provide compressed air for combustion to the engine. The turbocharger is driven to generate the compressed air by the exhaust from the engine.  An expander/generator is coupled to the turbocharger to receive at least a portion of the compressed air and generate electricity by expanding the compressed air.

[0004]  An aspect encompasses a method where, with a turbocharger, excess compressed air beyond the operating requirements of an internal combustion engine is generated.  This excess compressed air is expanded to generate electricity.

[0005]  The details of one or more implementations are set forth in the accompanying drawings and the description below.  Features, objects, and advantages will be apparent from the description and drawings, and from the claims.

DESCRIPTION OF DRAWINGS

[0006]  FIG. 1 is a schematic flow diagram of an internal combustion engine system having a turbocharger.

[0007]  FIG. 2 is a schematic flow diagra...