Filter clogging determination apparatus for diesel engine

Details Filter clogging determination apparatus for diesel engine Filter clogging determination apparatus for diesel engine

2011-07-19

2011-07-19

Denion, Thomas E (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S297000

Reexamination Certificate

active

07980060

ABSTRACT:
A clogging determination apparatus determines clogging of a DPF (Diesel Particulate Filter) such that exhaust pressure is estimated using a sensor deigned for regular control of an engine, without using exhaust pressure sensor. The apparatus includes: the DPF disposed in an exhaust system; an exhaust sensor that measures an air-fuel ratio λ in exhaust gas; and an injector that changes the air-fuel ratio in an cylinder through post-injection. A response time T taken for the exhaust sensor to detect a change in the air-fuel ratio is measured from the time when the post-injection is output from the injector. If this response time T is longer than a clogging determination response time To, the apparatus determines that the DPF is clogged.

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