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US 7,031,827 B2Granted
Computer algorithm to estimate particulate filter regeneration rates
AssigneeFord Global Technologies, LLC
InventorsDominic Trudell, Michiel J. van Nieuwstadt
Life of this patent
Estimating the term…
Abstract
A system and method is described for determining degradation of a diesel particulate filter in an engine exhaust system. The method uses information indicative of a regeneration rate, such as regeneration duration. From this, it is possible to determine when particulate filter operation has degraded.
Claims19
A system comprising:
- an emission control system in a diesel engine's exhaust, the emission control system having at least a catalyst and a particulate filter;
- and
- a computer storage medium having a computer program encoded therein for monitoring said particulate filter in the diesel engine exhaust, said computer storage medium comprising:
- code for determining a first parameter indicative of a regeneration rate of said particulate filter;
- code for determining an expected reference band that is a function of an operating parameter;
- and
- code for determining degradation of said particulate filter based on whether said first parameter falls outside the expected reference band.
4 more elements
A system comprising:
- a computer storage medium having a computer program encoded therein for monitoring a particulate filter in a diesel engine exhaust, said computer storage medium comprising:
- code for determining a parameter indicative of a regeneration rate of said particulate filter;
- and
- code for determining degradation of said particulate filter based on said parameter, wherein said parameter is calculated based on a weighted sum of a plurality of exhaust gas temperatures, and a plurality of rates of change of exhaust gas temperatures.
1 more element
A system comprising:
- a computer storage medium having a computer program encoded therein for monitoring a particulate filter in a diesel engine exhaust, said computer storage medium comprising:
- code for determining a start point of a regeneration of said particulate filter;
- code for determining an end point of said regeneration of said particulate filter;
- code for determining an exhaust temperature during said regeneration and an amount of particulate stored at said start point;
- and
- code for determining degradation of said particulate filter based on said determined start and end point, taking into account said temperature, and said amount of stored particulate.
3 more elements
A method for monitoring a particulate filter in a diesel engine exhaust, the exhaust also having at least a catalyst, the method comprising:
- monitoring a regeneration rate of said particulate filter;
- and
- determining degradation of said particulate filter when said regeneration rate falls outside a reference band, where said determination takes into account exhaust temperature during said regeneration to thereby account for variation in regeneration rate as a result of said temperature, where said variation accounts for a relatively slower expected regeneration rate during at least a lower temperature, and a relatively faster expected regeneration rate during at least a higher temperature.
Dependencies are inferred from the claim text.