EVAPORATED FUEL TREATMENT DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an evaporated fuel treatment device for correctly diagnosing an opening malfunction of a closing valve provided in a passage to communicate a canister with a fuel tank by a simple control. SOLUTION: A closing valve 28 is provided between a fuel tank 10 and a canister 26. A pump module pressure sensor 86 to detect the canister side pressure and a tank internal pressure sensor 12 to detect the tank internal pressure are provided. It is determined that no opening malfunction occurs in the closing valve 28 if a significant differential pressure is detected between the canister side pressure and the tank internal pressure. COPYRIGHT: (C)2004,JPO