OPEN-LOOP METHOD AND SYSTEM FOR CONTROLLING THE STORAGE AND RELEASE CYCLES OF AN EMISSION CONTROL DEVICE
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United States of America Patent
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-
Dec 10, 2002
Grant Date -
Dec 19, 2002
app pub date -
Jun 19, 2001
filing date -
Jun 19, 2001
priority date (Note) -
Granted
status (Latency Note)
Importance
Abstract
A method and system for controlling the operation of an internal combustion engine, wherein exhaust gas generated by the engine is directed through an emission control device, includes determining instantaneous rates of storage for a constituent of the exhaust gas, such as NO.sub.x, as well as the capacity reduction of the device to store the exhaust gas constituent as a function of a calculated value representing an amount of SO.sub.x which has accumulated in the device since a prior device-regeneration (desulfation) event. The calculated accumulated SO.sub.x value is also preferably used to schedule a device-regeneration event, as when the calculated accumulated SO.sub.x value exceeds a predetermined threshold value.
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