EVAPORATED FUEL TRANSPIRATION PREVENTING DEVICE OF INTERNAL COMBUSTION ENGINE

PURPOSE:To provide an evaporated fuel transpiration preventing device of an internal combustion engine, which is not worsening the air-fuel ratio of exhaust even if a purge mixture is taken into the exhaust system of an engine. CONSTITUTION:With an air pump driven, evaporated fuel stuck to a caniste...

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Bibliographische Detailangaben
1. Verfasser:	KANETOSHI KAZUHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBUSTION ENGINES ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE:To provide an evaporated fuel transpiration preventing device of an internal combustion engine, which is not worsening the air-fuel ratio of exhaust even if a purge mixture is taken into the exhaust system of an engine. CONSTITUTION:With an air pump driven, evaporated fuel stuck to a canister 10 is separated and drawn in by suction and simultaneously a secondary air is drawn in via a fresh air inlet passage 24, and they are mixed together and then discharged to an exhaust passage 3. At this time, an exhaust system purge flow control valve 23 and a fresh air flow control valve 25 are controlled for their opening so as to make the air-fuel ratio of exhaust existing in upstream of a three-way catalytic converter 4 to be detected on the basis of the output of an oxygen sensor 5 become the target air-fuel ratio. With this constitution, at the time of engine cold, an ameliorative effect of exhaust characteristics owing to the secondary air suction can be brought into full play as doing a job for purging.