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US 7,017,338 B2Granted
Diesel particulate filter pressure monitor
AssigneeFord Global Technologies, LLC
InventorMichiel van Nieuwstadt
Life of this patent
Estimating the term…
Abstract
A low cost particulate filter pressure monitoring system and method are presented. The differential pressure across the filter is estimated based on an atmospheric pressure, a measured absolute exhaust gas pressure upstream of the first emission control device coupled to the engine and an estimated pressure drop across all other emission control devices.
Claims5
An emission control system for a diesel engine, comprising:
- an oxidation catalyst coupled downstream of the engine;
- a particulate filter coupled downstream of said oxidation catalyst;
- a lean NOx trap coupled downstream of said particulate filter;
- and a computer providing an indication that particulate filter regeneration is required based at least on a signal from an exhaust gas sensor coupled only upstream of said oxidation catalyst, said computer further regenerating said particulate filter in response to said indication.
1 more element
Dependencies are inferred from the claim text.