FUEL VAPOR PROCESSING APPARATUS

摘要

A fuel vapor processing apparatus may include a canister, a closing valve provided in a vapor passage connecting the canister and the fuel tank, an actuator coupled to the movable valve member, and a control device coupled to the actuator. The control device may perform a learning control, in which a valve opening start position is learned based on a stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value while the moving distance of the movable valve member is changed such that (a) the movable valve member moves from the reference position to a learning start position at a first speed in a valve opening direction and (b) the movable valve member moves further from the learning start position at a second speed in the valve opening direction.

主权项

1. A fuel vapor processing apparatus comprising:
a canister configured to be capable of adsorbing fuel vapor produced in a fuel tank; a closing valve provided in a vapor passage connecting the canister and the fuel tank, the closing valve comprising a movable valve member and an actuator coupled to the movable valve member; wherein the closing valve is closed when a stroke distance of the movable valve member with respect to a reference position is between zero and a valve open start position, and the closing valve is opened when the stroke distance of the movable member exceeds the valve open start position; and a control device coupled to the actuator and configured to perform a learning control, in which the valve opening start position is learned based on the stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value from a reference pressure value while the moving distance of the movable valve member is changed such that:
(a) the movable valve member moves from the reference position to a learning start position at a first speed in a valve opening direction; and(b) the movable valve member moves further from the learning start position in the valve opening direction at a second speed;wherein the second speed is lower than the first speed.