Method and system for controlling storage and release of exhaust gas constituents in an emission control device
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United States of America Patent
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-
Jan 7, 2003
Grant Date -
Dec 26, 2002
app pub date -
Jun 19, 2001
filing date -
Jun 19, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system are provided for adaptive control of a purge time and a fill time for an emission control device used to reduce emission of a selected constituent gas, such NO.sub.x, of an engine's generated exhaust gas, with optimization and adapting of stored values to reflect changes in device operating conditions. The invention determines a present value representative of the quantity of oxygen stored in the device, as well as a present value for the maximum device NO.sub.x -storage capacity to provide real-time adjustment of purge and fill time to achieve optimum overall operation of the device. The invention also periodically determines actual fill times which corresponding to optimal fill times to generate adaptive values for use during normal open-loop control.
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