Emission control device for cylinder fuel injection engine
AssigneeHitachi, Ltd.
InventorsYoichi Iihoshi, Minoru Ohsuga, Toshiharu Nogi, Takuya Shiraishi, Noboru Tokuyasu
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Abstract
An exhaust control system for a cylinder fuel injection engine having a cylinder injection injectors directly injecting a fuel into combustion chambers and a catalytic converter provided in an exhaust passage from said combustion chambers for purifying an exhaust gas, such that the air/fuel ratio in the combustion chambers is periodically made richer for quickening activation of catalytic converter.
Claims2
An exhaust control system for a cylinder fuel injection engine having injectors directly injecting a fuel into combustion chambers and a catalytic converter provided in an exhaust passage from said combustion chambers for purifying an exhaust gas, wherein an air/fuel ratio in said combustion chambers is periodically enriched at a relatively low temperature before catalytic converter activation, which includes a catalytic converter temperature measuring means for measuring a temperature of said catalytic converter for increasing a period to which an interval between periods of the enriched air/fuel ratio in the combustion chambers when a temperature of the catalytic converter is lower than a predetermined value before the catalytic converter activation.
Dependencies are inferred from the claim text.