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.
Claims17
A method of operating an engine exhaust system including a particulate filter comprising,
- controlling filter regeneration based on a CO2 signature of oxidized, post-filter exhaust particulate matters (PMs), the CO2 signature based on a CO2 level estimated by a CO2 sensor positioned downstream of the filter and the exhaust PMs being oxidized on a heated substrate, positioned upstream of the CO2 sensor using oxygen from exhaust gas, the controlling including:
- during a filter storing condition, initiating filter regeneration based on the CO2 signature;
- and
- during a filter regenerating condition, determining regeneration degradation based on the CO2 signature.
A method for managing particulate matter emissions of an engine system including a particulate filter, a CO2 sensor downstream of the filter, a substrate upstream of the CO2 sensor, and a substrate heater coupled to the substrate, comprising:
- during filter storing,
- electrically heating the substrate with the heater;
- estimating an exhaust CO2 level of the oxidized exhaust PMs with the CO2 sensor;
- and
- controlling filter regeneration and adjusting engine operation based on the estimated exhaust CO2 level;
- and
- during filter regeneration,
- disabling the heater while non-electrically heating the substrate with hot exhaust gas;
- estimating an exhaust CO2 level of the oxidized exhaust PMs with the CO2 sensor;
- and
- controlling filter regeneration and adjusting engine operation based on the estimated exhaust CO2 level.
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
- a controller configured to,
- heat the substrate;
- oxidize exhaust PMs on the heated substrate;
- estimate a CO2 level corresponding to the oxidized exhaust PMs;
- control 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.