SYSTEM FOR PARTICULATE MATTER SENSOR SIGNAL PROCESSING
First Claim
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1. A sensor system comprising:
- a first particulate matter (PM) sensor situated in an exhaust conveyance device connected to an engine;
a particulate matter filter situated downstream from the first PM sensor in the exhaust conveyance device; and
a second PM sensor situated in the exhaust conveyance device downstream from the particulate matter filter; and
wherein;
the first PM sensor is for detecting particulate matter approaching the filter;
the second PM sensor is for detecting particulate matter leaving the filter;
the first PM sensor is for indicating an amount of loading of particulate matter in the filter; and
the second PM sensor is for indicating failure of the filter.
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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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Citations
34 Claims
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1. A sensor system comprising:
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a first particulate matter (PM) sensor situated in an exhaust conveyance device connected to an engine;
a particulate matter filter situated downstream from the first PM sensor in the exhaust conveyance device; and
a second PM sensor situated in the exhaust conveyance device downstream from the particulate matter filter; and
wherein;
the first PM sensor is for detecting particulate matter approaching the filter;
the second PM sensor is for detecting particulate matter leaving the filter;
the first PM sensor is for indicating an amount of loading of particulate matter in the filter; and
the second PM sensor is for indicating failure of the filter. - View Dependent Claims (2, 3, 4)
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5. A sensor system comprising:
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a first particulate (PM) sensor situated in an exhaust gas conveyance device of an engine;
a particulate matter filter situated in the exhaust gas conveyance device downstream from the first PM sensor; and
a processor connected to the first PM sensor for determining the loading of particulate matter in the filter and for operating the particulate matter filter for cleaning. - View Dependent Claims (6, 7, 8)
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9. A sensor system comprising:
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a particulate matter filter situated in an exhaust gas system of an engine; and
a particulate matter (PM) sensor situated in the exhaust gas system downstream from the filter. - View Dependent Claims (10, 11)
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12. A processing system for particulate matter sensing comprising:
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a particulate matter (PM) sensor for being positioned in an exhaust stream;
a processor connected to the PM sensor; and
an engine crank angle input connected to the processor; and
wherein the processor comprises a program for providing analyzed profiles of individual engine cylinder behavior. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A processing system for determining engine parameters comprising:
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a particulate matter transducer profile;
a charge amplifier having an input connected to the transducer profile;
a data extractor connected to the charge amplifier; and
a signal conditioner and a processor connected to the data extractor. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method for analyzing particulate matter (PM) of an exhaust gas of an engine, comprising:
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detecting particulate matter of an exhaust gas;
converting the detection of particulate matter of the exhaust gas into PM signals; and
processing the PM signals into information about each cylinder. - View Dependent Claims (27, 28, 29, 30, 31)
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32. A sensor system comprising:
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a first particulate matter (PM) sensor situated in an exhaust conveyance device connected to an engine;
a second PM sensor situated in the exhaust conveyance device downstream from a diesel particulate filter (DPF);
a third PM device situated in the exhaust conveyance device downstream from the first PM sensor and upstream from the DPF filter; and
a processor connected to the first PM sensor, the second PM sensor, the third PM sensor and the DPF filter. - View Dependent Claims (33, 34)
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Specification