Loading patent…
AssigneeFord Global Technologies, LLC
InventorsGarth Michael Meyer, Joseph Richard Asik
Estimating the term…
A system and method for optimizing the regeneration cycle of an emission control device, such as a lean NOx trap, is disclosed wherein the device is filled to a predetermined fraction of its existing capacity and is then completely emptied during a device purge. As device capacity is substantially reduced, as indicated by the actual fill time becoming equal to or less than a predetermined minimum fill time, a device desulfation event is performed to attempt to restore device capacity. A programmed computer controls the fill and purge times based on the amplitude of the voltage of a switching-type oxygen sensor and the time response of the sensor. The frequency of the purge, which ideally is directly related to the device capacity depletion rate, is controlled so that the device is not filled beyond the storage capacity limit.
A method of controlling the purging of a quantity of a constituent gas previously stored in an emission control device of an engine exhaust treatment system, wherein the engine exhaust treatment system includes a sensor operative to generate a signal representative of an oxygen concentration of engine exhaust gas passing through the device, the method comprising:
A method of filling and purging an emission control device located in the exhaust passage of an engine upstream from an oxygen sensor, so that the device is substantially filled to capacity with one or more constituent gases of the engine-generated exhaust during a fill time and substantially emptied during a subsequent purge time, the method comprising:
A system for controlling purging of an emission control device located in the exhaust passage of an engine, the device operating to store a constituent gas of engine-generated exhaust gas flowing through the device during a first engine operating condition and releasing stored constituent gas during a second engine operating condition, the system comprising:
Dependencies are inferred from the claim text.