Engine exhaust purifier

Details Engine exhaust purifier Engine exhaust purifier

1997-01-16

1998-06-30

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60277, 422171, F01N 328

Patent

active

057716900

ABSTRACT:
Two catalytic converters are disposed in series midway in an engine exhaust passage, and a by-pass valve selectively introduces exhaust into the upstream converter and a by-pass passage which by-passes the converter. When the catalyst temperature of the upstream catalytic converter exceeds a threshold value A, exhaust is routed to the by-pass passage. The catalyst temperature in the state when exhaust is routed to the upstream catalytic converter under steady state engine running conditions is stored as a convergence temperature depending on the engine running conditions.
When exhaust is routed to the by-pass passage, exhaust is re-introduced into the upstream converter only when both the catalyst temperature and the convergence temperature corresponding to the running conditions at that time are less than a threshold value B which is less than the threshold value A.
In this way, hunting of the by-pass valve operation is prevented.

REFERENCES:
patent: 5233830 (1993-08-01), Takeshima
patent: 5349816 (1994-09-01), Sanbayashi
patent: 5365734 (1994-11-01), Takeshima

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