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A method and apparatus for reducing oxides of nitrogen in the exhaust of an internal combustion engine. The apparatus includes a pressurizing unit for providing compressed air to a pressure swing adsorption unit. The pressure swing adsorption removes nitrogen from the air to produce nitrogen-reduced

A method and apparatus for reducing oxides of nitrogen in the exhaust of an internal combustion engine. The apparatus includes a pressurizing unit for providing compressed air to a pressure swing adsorption unit. The pressure swing adsorption removes nitrogen from the air to produce nitrogen-reduced air, which is then supplied to the engine. The pressurizing unit may be a compressor, a turbocharger, or a supercharger. The engine may utilize exhaust gas recirculation and fuel injection with air assist.

대표청구항 ▼

1. An engine system comprising:an internal combustion engine having a plurality of cylinders, each of which has an intake port and an exhaust port; an air intake system through which air is directed to the cylinders of the engine; an exhaust system for directing exhaust gas generated by combustion i

1. An engine system comprising:an internal combustion engine having a plurality of cylinders, each of which has an intake port and an exhaust port; an air intake system through which air is directed to the cylinders of the engine; an exhaust system for directing exhaust gas generated by combustion in the cylinders to the outside atmosphere; a pressurizing unit operable to compress air; and a pressure swing adsorption unit having an inlet connected to the pressurizing unit to receive compressed air therefrom, and an outlet connected to the air intake system of the engine, said pressure swing adsorption unit including an adsorbent bed cyclable between a production mode, wherein nitrogen in the air is adsorbed by the adsorbent bed at an elevated pressure to produce nitrogen-reduced air, and a regeneration mode, wherein nitrogen is desorbed from the adsorbent bed at a reduced pressure to produce nitrogen gas, said nitrogen-reduced air from the production mode of the adsorbent bed being supplied to the air intake system of the engine.