Diesel particulate filter control
AssigneeFord Global Technologies, LLC
InventorChristopher Parnin
Life of this patent
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Abstract
Methods and systems are provided for managing particulate emissions in an engine including a particulate filter and a CO2 sensor downstream of the filter. A CO2 sensor may be used to infer the presence of particulate matter in the exhaust, downstream of the filter. By sensing particulate matter in the post-filter exhaust, filter degradation may be identified.
Claims16
A method for monitoring particulate matter (PM) emissions from an engine exhaust including a particulate filter, comprising,
- exhausting PMs from the particulate filter to a downstream substrate;
- controlling temperature of the substrate via a heater, where exhausted PMs are oxidized on the substrate upstream of a CO2sensor;
- and
- indicating filter degradation based on a CO2 signature of the oxidized, post-filter exhaust PMs indicated by the CO2sensor.
A method of operating an engine exhaust system including a particulate filter and a downstream electrically heated substrate, comprising,
- during substrate non-heating, adjusting engine operation based on an exhaust CO2 level estimated by a sensor;
- and
- during substrate heating, oxidizing post-filter particulate matters (PMs) on the substrate and adjusting engine operation based on a CO2 signature from the sensor indicative of PM levels downstream of the particulate filter.
An engine exhaust system, comprising:
- a particulate filter;
- a CO2 sensor coupled downstream of the filter;
- a substrate positioned upstream of the CO2 sensor and downstream of the particulate filter;
- and
- a controller having instructions thereon to,
- during filter storing,
- heat the substrate;
- estimate a CO2 level corresponding to exhaust PMs oxidized on the heated substrate;
- initiate filter regeneration based on the estimated CO2 level;
- and
- determine filter degradation based on the estimated CO2 level.
Dependencies are inferred from the claim text.