Passive re-induction apparatus, system, and method for recirculating exhaust gas in gasoline and diesel engines

An exhaust gas passive re-induction system, comprising:

• an exhaust gas re-induction apparatus coupled to an exhaust system of an engine and structured to receive exhaust gas, sense an oxygen content within the exhaust gas, and recirculate at least a portion of the exhaust gas to an air inlet of the engine;
• and
• a recirculation conduit connecting the exhaust gas re-induction apparatus to the air inlet of the engine;
• wherein the quantity of exhaust gas recirculated to the air inlet of the engine from the re-induction apparatus is dependent on the operating speed of the engine and the size dimensions of the re-induction apparatus.

A method for passively recirculating exhaust gas in a gasoline or diesel engine, the method comprising:

• receiving exhaust gas from an engine at an input of an exhaust gas re-induction apparatus;
• sensing an amount of oxygen in the exhaust gas received at the input of the exhaust gas re-induction apparatus;
• recirculating a first quantity of exhaust gas to an air inlet of the engine when the operating speed of the engine corresponds to an idling speed;
• recirculating a second quantity of exhaust gas to the air inlet of the engine when the operating speed of the engine corresponds to a second operating speed greater than the idling speed;
• and
• recirculating a third quantity of exhaust gas to the air inlet of the engine when the operating speed of the engine corresponds to a third operating speed greater than each of the idling speed and the second operating speed;
• wherein the second quantity of exhaust gas is greater than the first quantity of exhaust gas, and the third quantity of exhaust gas is greater than each of the first and second quantities of exhaust gas;
• and
• wherein the quantities of exhaust gas recirculated to the air inlet of the engine from the re-induction apparatus are essentially dependent only on the operating speed of the engine and the size dimensions of the re-induction apparatus.