Electronic flow control for a stratified EGR system

An engine control system for a multi-port direct injection engine, comprising:

• a first camshaft having cam mechanisms that control first and second intake valves and a first exhaust valve for each of a plurality of cylinders;
• and
• a second camshaft having cam mechanisms that control a second exhaust valve for each of the plurality of cylinders;
• wherein the second camshaft is capable of phasing the second exhaust valve between an exhaust stroke and an intake stroke;
• wherein exhaust gases from the plurality of cylinders enter an exhaust manifold via the second exhaust valves when the second exhaust valves are phased with the exhaust stroke and exhaust gases from the exhaust manifold enters the plurality of cylinders via the second exhaust valves when the second exhaust valves are phased with the intake stroke;
• and
• wherein the second exhaust valves control exhaust gas glow to and from the plurality of cylinders via helical swirl exhaust gas ports.

A direct injection spark initiated internal combustion engine having a plurality of cylinders, where each cylinder comprises a first and second intake port and first and second exhaust ports, the engine comprising:

• a first intake manifold that comprises a first flow valve that controls the air flow into the first intake ports;
• a second intake manifold that comprises a second flow valve that controls the air flow into the second intake ports;
• a first exhaust gas manifold that receives exhaust gas from the cylinders via the first exhaust ports;
• a camshaft that can phase an exhaust valve for each of the second exhaust ports from an intake stoke to an exhaust stroke;
• and
• a second exhaust gas manifold that receives exhaust gas from the cylinders via the second exhaust ports when the exhaust valves are phased with the exhaust stroke, wherein the second exhaust gas manifold comprises a third flow valve that controls the exhaust gas flow into the cylinders via the second exhaust ports when the exhaust valves are phased with the intake stroke.

A spark initiated internal combustion engine, comprising:

• a plurality of cylinders that each comprise first and second intake ports and first and second exhaust ports;
• a camshaft that controls an exhaust gas re-circulation valve for each of the second exhaust ports, wherein the camshaft can phase the exhaust gas re-circulation valves from an intake stroke to an exhaust stroke;
• and
• an intake flow valve for each cylinder that controls air flow into the cylinders via the second intake ports and an exhaust gas re-circulation valve that controls exhaust gas flow into the cylinders via the second exhaust ports;
• wherein the exhaust gas re-circulation valves allow exhaust gas to enter the cylinders via the second exhaust port when the camshaft is phased with the intake stroke and allow exhaust gas to escape from the cylinders when the camshaft is phased with the intake stroke;
• and
• wherein the intake flow valves and exhaust gas re-circulation valves are adjusted to fill each cylinder with a combination of air and exhaust gas.