Integrated exhaust gas recirculation and charge cooling system
AssigneeGM Global Technology Operations LLC
InventorKo-Jen Wu
Life of this patent
Estimating the term…
Abstract
An exhaust gas recirculation system comprises an exhaust driven turbocharger to deliver a compressed intake charge through an intake charge conduit and to an engine. A compressed intake charge cooler receives, cools and transits the compressed intake charge. A cooling system, independent of the engine cooling system delivers coolant to the compressed intake charge cooler to transfer heat from the compressed intake charge thereto and to a cooler. Exhaust gas conduits extend between the exhaust system of the internal combustion engine, from locations upstream and downstream of the exhaust driven turbocharger, to the intake charge conduit. Exhaust gas coolers receive, cool and transit the exhaust gas.
Claims13
An exhaust gas recirculation system for an internal combustion engine, the internal combustion engine including a primary cooling system, the exhaust gas recirculation system comprising:
- an exhaust driven turbocharger configured to deliver a compressed intake charge, comprising exhaust gas from an exhaust system and ambient air, through an intake charge conduit and to the internal combustion engine;
- a compressed intake charge cooler in fluid communication with the intake charge conduit and configured to receive, cool and transit the compressed intake charge therethrough;
- a secondary cooling system, independent of the primary cooling system, in fluid communication with the compressed intake charge cooler through a cooling system conduit and having a cooling medium therein;
- a cooler configured to receive the cooling medium through the secondary cooling system conduit;
- an exhaust gas conduit extending between the exhaust system of the internal combustion engine, from a location upstream of the exhaust driven turbocharger, to the intake charge conduit, at a location upstream of the intake charge cooler;
- and
- an exhaust gas cooler in fluid communication with the exhaust gas conduit and configured to receive, cool and transit the recirculated exhaust gas therethrough, wherein the secondary cooling system is in fluid communication with the exhaust gas cooler through the secondary cooling system conduit for delivery of the cooling medium from the secondary cooling system to, and through, the exhaust gas cooler to the cooler following the cooling mediums exit from the exhaust gas cooler.
An exhaust gas recirculation system for an internal combustion engine, the internal combustion engine including a primary cooling system, the exhaust gas recirculation system comprising:
- an exhaust driven turbocharger configured to deliver a compressed intake charge, comprising exhaust gas from an exhaust system and ambient air, through an intake charge conduit and to cylinders of the internal combustion engine;
- a compressed intake charge cooler in fluid communication with the intake charge conduit and configured to receive, cool and transit the compressed intake charge therethrough;
- a secondary cooling system, independent of the primary cooling system in fluid communication with the compressed intake charge cooler through a cooling system conduit having a cooling medium therein;
- a cooler configured to receive the cooling medium through the secondary cooling system conduit;
- a first exhaust gas conduit extending between the exhaust system of the internal combustion engine, from a location upstream of the exhaust driven turbocharger, to the intake charge conduit, at a location upstream of the intake charge cooler;
- a first exhaust gas cooler in fluid communication with the first exhaust gas conduit and configured to receive, cool and transit the recirculated exhaust gas therethrough, the secondary cooling system in fluid communication with the first exhaust gas cooler through the cooling system conduit for delivery of the cooling medium from the secondary cooling system to, and through, the first exhaust gas cooler and to the cooler following the cooling mediums exit from the first exhaust gas cooler;
- a second exhaust gas conduit extending between the exhaust system of the internal combustion engine, from a location downstream of the exhaust driven turbocharger, and configured to divert a portion of the exhaust gas from the exhaust system and to return it to the internal combustion engine through a compressor housing inlet of the exhaust driven turbocharger;
- and
- a second exhaust gas cooler disposed inline of the second exhaust gas conduit, upstream of the compressor housing inlet.
Dependencies are inferred from the claim text.