Back to results
US 8,572,952 B2Granted
Diesel particulate filter control
AssigneeFord Global Technologies, LLC
InventorChristopher Parnin
Life of this patent
Estimating the term…
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 controlling an engine with a particulate filter, comprising,
- exhausting particulate matter from the particulate filter to a downstream substrate;
- controlling temperature of the substrate via a heater, exhausted particulate matter being oxidized on the substrate upstream of a CO2 sensor;
- indicating filter degradation based on a CO2 signature of the oxidized, post-filter exhaust particulate matter indicated by the CO2 sensor;
- and
- controlling filter regeneration in response to the CO2 signature.
2 more elements
A method of operating a turbocharged engine exhaust system including a particulate filter and a downstream electrically heated substrate, comprising,
- during substrate non-heating, adjusting an engine boost amount based on an exhaust CO2 level estimated by a sensor;
- and
- during substrate heating, oxidizing post-filter particulate matters (PMs) on the substrate, and initiating particulate filter regeneration 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 turbocharger;
- 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;
- determine filter degradation based on the estimated CO2 level;
- and
- adjust engine boost amount based on the CO2 sensor.
10 more elements
Dependencies are inferred from the claim text.