Evaporated fuel processing apparatus
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United States of America Patent
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Mar 27, 2018
Issued Date -
N/A
app pub date -
Jun 17, 2016
filing date -
Jun 26, 2015
priority date (Note) -
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Abstract
An evaporated fuel processing apparatus includes: a fuel tank that stores fuel supplied to an engine; a purge pipe that communicates an upper space in the fuel tank with an inlet system of the engine; an electromagnetic valve that is mounted on the purge pipe and that opens and closes the purge pipe; an air-fuel ratio detecting module for detecting an air-fuel ratio of an air-fuel mixture burned in the engine in accordance with an oxygen concentration in exhaust gas emitted from the engine; and a controlling module for controlling open and close of the electromagnetic valve based on an operating state of the engine. The controller controls at least one of a valve-open cycle, a valve-open period, and a valve-open amount of the electromagnetic valve based on a variation value of the air-fuel ratio detected by the air-fuel ratio detecting module when opening the electromagnetic valve.
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