Boost wastegate device for EGR assist

An apparatus for assisting exhaust gas recirculation in a diesel engine, the apparatus comprising:

• an air intake conduit having an inlet and an outlet;
• an internal combustion engine including an intake manifold and an exhaust manifold, the intake manifold operatively coupled to the outlet of the air intake conduit, wherein the internal combustion engine produces exhaust gas exiting the exhaust manifold;
• an exhaust conduit having an inlet and an outlet, wherein the exhaust conduit inlet is operatively coupled to the exhaust manifold;
• an exhaust gas recirculation conduit having an inlet and an outlet, the inlet of the exhaust gas recirculation conduit is operatively coupled to the exhaust manifold and the outlet is operatively coupled to the intake manifold;
• a turbocharger having a compressor and a turbine, the compressor being operatively coupled to the air intake conduit and the turbine being operatively coupled to the exhaust conduit;
• and
• wastegate means operatively coupled to the air intake conduit for increasing the surge margin of the compressor by selectively altering the flow rate of exhaust through the exhaust gas recirculation conduit.

An apparatus comprising:

• an air intake conduit having an inlet and an outlet;
• an internal combustion engine including an intake manifold and an exhaust manifold, the intake manifold operatively coupled to the outlet of the air intake conduit, wherein the internal combustion engine produces exhaust gas exiting the exhaust manifold;
• an exhaust conduit having an inlet and an outlet, wherein the exhaust conduit inlet is operatively coupled to the exhaust manifold;
• a turbocharger having a compressor and a turbine, the turbocharger being operatively coupled to the air intake conduit and the exhaust conduit;
• a first air cooler operatively coupled to the air intake conduit, wherein the first air cooler cools air compressed by the turbocharger;
• second wastegate means operatively coupled to the exhaust conduit for selectively enabling exhaust gas to bypass the turbocharger;
• an exhaust gas recirculation conduit having an inlet and an outlet, the inlet of the exhaust gas recirculation conduit being operatively coupled to the exhaust manifold and the outlet being operatively coupled to the intake manifold
• a second air cooler operatively coupled to the exhaust gas recirculation conduit;
• and
• first wastegate means operatively coupled to the air intake for increasing the surge margin of the compressor by selectively altering the flow rate of exhaust through the exhaust gas recirculation conduit.

An internal combustion engine exhaust gas recirculation system comprising:

• an internal combustion engine including an intake manifold and an exhaust manifold, the engine operable to produce exhaust gas;
• an air intake conduit operatively coupled to the intake manifold for delivering air to the intake manifold;
• an exhaust conduit operatively coupled to the exhaust manifold for passing at least a portion of the exhaust gas;
• a turbocharger having a compressor and a turbine, the compressor being operatively coupled to the air intake conduit and the turbine being operatively coupled to the exhaust conduit;
• an exhaust gas recirculation conduit operatively coupled to the intake manifold and the exhaust manifold, the exhaust gas recirculation conduit operable to flow at least a portion of the exhaust gas at a flow rate to the intake manifold;
• and
• a wastegate valve means for increasing the surge margin of the compressor, the wastegate valve means being operatively coupled to the air intake conduit for selectively venting at least a portion of the intake air to alter the flow rate of exhaust gas through the exhaust gas recirculartion conduit, the wastegate valve means including a gate having an area greater than zero to about 0.14 in2.