System for particulate matter sensor signal processing
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United States of America Patent
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Apr 24, 2012
Grant Date -
Jan 13, 2011
app pub date -
Jul 23, 2010
filing date -
Oct 21, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A system having a particulate matter sensor in an exhaust stream of an engine upstream from a particulate filter and another such sensor downstream from the filter. There may also be an exhaust gas recirculation (EGR) control on the engine. The amount of particulate matter in or loading of the filter may be determined by the upstream filter. The working condition of the filter may be determined by the downstream sensor. The filter may have a heater and control for providing operational and particulate matter burn-off temperatures to the filter. A processor may be connected to the sensors, the EGR control and the filter heater control.
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