Patent ID: 9695782
Date: 2017-07-04
CPC Classifications: F02M

Claim:
1. An abnormality diagnosis device for an evaporated-gas purge system, the evaporated-gas purge system including a purge valve opening and closing a purge passage purging an evaporated gas generated according to an evaporation of a fuel in a fuel tank to an intake system of an internal combustion engine, the abnormality diagnosis device comprising: a pressure introducing portion introducing a pressure into an evaporation system from the fuel tank to the purge valve; a pressure detecting portion detecting a pressure in the evaporation system; a reference-pressure detecting portion including a reference orifice having a predetermined diameter; and an abnormality diagnosis portion executing the abnormality diagnosis portion determining whether a leakage abnormality of the evaporation system and a fixed open abnormality of the purge valve in which the purge valve is fixed to be open are generated, based on a magnitude relation between the reference pressure, the purge-valve closed pressure, and the purge-valve open pressure.