Patent ID: 6830040
Filing Date: 2004-12-14
Classification: F02D,F02M

Abstract:
An evaporative fuel control system for an internal combustion engine comprising:(a) an intake passage; (b) a canister for absorbing evaporative fuel disposed in an evaporative fuel control passage in communication with a fuel tank; (c) an open passage to the atmosphere to communicate said canister with the ambient atmosphere; (d) an atmosphere open/close valve disposed in said atmosphere open passage; (e) a purge valve disposed between said intake passage and said canister; (f) a detector of the concentration of purge which purge is taken into said engine; and (g) a controller for performing a diagnosis of failure of the evaporative fuel control system after a predetermined purge time has elapsed, said purge time being set according to the concentration of the purge detected by said detector.