CONTROL DEVICE FOR ENGINE

Provided is a control device for an engine which is capable of purifying NOx with high efficiency at a restart after an idle stop without deteriorating purification efficiency of HC and CO. At the restart after the idle stop, an air-fuel ratio is controlled to be rich, and an atmosphere inside of a...

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Bibliographic Details
Main Authors OHSUGA, Minoru, ICHIHARA, Takanobu, KANETOSHI, Kazuhiko, KATOUGI, Kouzo, NAKAGAWA, Shinji, TAKAMURA, Hiroyuki
Format Patent
LanguageEnglish
French
German
Published 28.02.2018
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:Provided is a control device for an engine which is capable of purifying NOx with high efficiency at a restart after an idle stop without deteriorating purification efficiency of HC and CO. At the restart after the idle stop, an air-fuel ratio is controlled to be rich, and an atmosphere inside of a catalyst is estimated on the basis of a required time ”T from a time point at which an output value (VO2_2) of first oxygen concentration detection means upstream of the catalyst exceeds a predetermined value A1 to a time point at which an output value (VO2_2) of second oxygen concentration detection means downstream of the catalyst exceeds a predetermined value A2, whereby an air-fuel ratio at next and subsequent restarts is corrected so that the atmosphere inside of the catalyst is optimized at the next and subsequent restarts.
Bibliography:Application Number: EP20100753337