FAILURE DETERMINATION DEVICES FOR FUEL VAPOR PROCESSING SYSTEMS

摘要

A failure detecting device for a fuel vapor processing system may include a leakage determination device configured to determine leakage of fuel vapor from a target region of the fuel vapor processing system. The leakage determination device may include a canister closed valve provided in an atmospheric passage connected between a canister and an atmosphere. The canister closed valve may switch between an open position and a closed upon receiving a supply of electric power, and may maintain the open position or the closed position when no electric power is received.

主权项

1. A failure detecting device for a fuel vapor processing system including a fuel tank and a canister, the failure detecting device comprising:
a pressure detecting device configured to detect a pressure within a target region of the fuel vapor processing system; a closing device configured to close the target region; and a leakage determination device configured to determine leakage of fuel vapor from the target region based on a change of pressure within the target region in a closed state of the target region; wherein:
the closing device comprises a canister closed valve provided in an atmospheric passage that connects the canister to an atmosphere; andthe canister closed valve is configured to switch between an open position and a closed position upon receiving a supply of electric power, and to maintain the open position or the closed position when no electric power is supplied to the canister closed valve.