ABNORMALITY SENSING DEVICE FOR EVAPORATION FUEL PURGE SYSTEM

摘要

An abnormality sensing device for an evaporation fuel purge system is equipped with a purge passage that connects a canister to an intake passage of an internal combustion engine, a purge pump, a purge control valve, and a valve component that closes and opens the purge passage at a target passage including at least a first purge passage defined between the purge control valve and the intake passage. An abnormality determining portion detects a physical quantity relevant to a pressure change in the target passage in a determination possible state where the purge control valve allows the evaporation fuel to flow through the first purge passage and where the valve component prohibits the evaporation fuel from being supplied to the intake passage.

主权项

1. An abnormality sensing device for an evaporation fuel purge system comprising:
a fuel tank storing fuel; a canister that adsorbs evaporation fuel generated in the fuel tank and that desorbs the evaporation fuel; an intake passage of an internal combustion engine in which the evaporation fuel desorbed from the canister is mixed with fuel for combustion to be combusted; a purge passage that connects the canister to the intake passage of the internal combustion engine; a purge pump that pumps the evaporation fuel from the canister to the intake passage of the internal combustion engine; a purge control valve disposed in the purge passage to control a flow of the evaporation fuel pumped by the purge pump to flow through the purge passage; a valve component that closes and opens the purge passage to control the evaporation fuel to flow into the intake passage of the internal combustion engine at a target passage of the purge passage, the target passage including at least a first purge passage defined between the purge control valve and the intake passage of the internal combustion engine; and an abnormality determining portion that determines whether there is an abnormality in the evaporation fuel purge system in a state where the evaporation fuel is pumped by the purge pump toward the intake passage of the internal combustion engine, wherein the abnormality determining portion is in a determination possible state when the evaporation fuel is pumped toward the intake passage of the internal combustion engine by the purge pump, when the purge control valve allows the evaporation fuel to flow through the first purge passage, and when the valve component prohibits the evaporation fuel from being supplied to the intake passage of the internal combustion engine, and the abnormality determining portion detects a predetermined physical quantity relevant to a pressure change in the target passage in the determination possible state, and determines whether there is an abnormality in the evaporation fuel purge system according to the predetermined physical quantity.