Method and system for late cycle oxygen injection in an internal

Details Method and system for late cycle oxygen injection in an internal Method and system for late cycle oxygen injection in an internal

1999-01-22

2000-05-30

Kwon, John

Internal-combustion engines

Charge forming device

Auxiliary air or oxygen added to combustible mixture

123586, F02B 2300

Patent

active

060679735

ABSTRACT:
A method and system for late cycle injection of oxygen enriched air into the combustion chamber of an internal combustion engine is disclosed. The late cycle oxygen injection system is part of an airflow management system that effectively controls the use of oxygen and nitrogen available in the intake air. The preferred system comprises an intake air separation device adapted for separating a prescribed portion of intake air into a flow of oxygen enriched air and a flow of nitrogen enriched air. The system includes an oxygen enriched air flow circuit extending from the intake air separating device to one or more combustion chambers and a control device adapted for controlling the introduction of the oxygen enriched air into the combustion chambers late in a combustion cycle in response to selected engine operating conditions such as engine speed or engine load or both. Preferably, the introduction of the oxygen enriched air into the combustion chamber occurs late in a combustion cycle at a crank angle between about 20 degrees and 120 degrees after top dead center and lasts for a prescribed time interval between about 5 degrees and 20 degrees of crank angle movement.

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