Engine Inlet For EGR-Air Flow Distribution

An air intake system for an internal combustion engine comprising:

• an intake manifold having an air inlet for admitting combustion gases, including at least air, into a plenum and four runners extending from the plenum, wherein each runner terminates at an outlet through which said combustion gases flow from the manifold;
• an EGR inlet for admitting exhaust gases recirculated by an EGR circuit from an exhaust side of the engine;
• an EGR tube disposed in the EGR inlet and partially extending into the plenum adjacent the air inlet, wherein the EGR tube has a slot formed therein which faces away from the air inlet and into the plenum;
• a first guide vane arranged in the plenum and having an upstream end positioned near the EGR tube, wherein the first guide vane diverges from the EGR tube to form first and second flow channels in the plenum;
• and
• a second guide vane arranged in the plenum and having an upstream end positioned near the upstream end of the first guide vane, wherein the second guide vane divides the second flow channel and diverges from the first guide vane to form a third flow channel in the plenum.

An internal combustion engine comprising:

• an engine including an engine block having a plurality of cylinders and a cylinder head secured to the engine block to cover the cylinders, the cylinder head having an intake port and an exhaust port associated with each of the plurality of cylinders;
• an intake manifold secured to an intake side of the engine and in fluid communication with each of the intake ports, the intake manifold having an air inlet for admitting combustion gases, including at least air, into a plenum, and a plurality of runners extending from the plenum, wherein each runner terminates at the intake port associated with each of the cylinders;
• an exhaust manifold secured to an exhaust side of the engine, in fluid communication with each of the exhaust ports and having an exhaust outlet for discharging exhaust gas from the exhaust manifold;
• an exhaust gas recirculation (EGR) circuit including a return line from the exhaust side of the engine to an EGR inlet formed in the intake manifold, an EGR valve disposed in the return line for selectively controlling the timing and amount of exhaust gases being recirculated to the intake manifold, an EGR tube disposed in the EGR inlet and partially extending into the plenum adjacent the air inlet, wherein the EGR tube has a slot formed therein which faces away from the air inlet and into the plenum, a first guide vane arranged in the plenum and having an upstream end positioned near the EGR tube, wherein the first guide vane diverges from the EGR tube between the plurality of runners to form first and second flow channels in the plenum.