Patent ID: 6089080
Filing Date: 2000-07-18
Classification: F02M

Abstract:
A diagnosis apparatus for an evaporation system of an engine, comprising a fuel tank, an evaporation pipe, a canister operatively arranged to introduce evaporation gas generated in said fuel tank through said evaporation pipe and having an adsorbent for temporarily adsorbing said evaporation gas, an evaporation system comprising a purge pipe having a purge valve for purging the adsorbed evaporation gas to an intake pipe of the engine, a pressure sensor for detecting pressure in said evaporation system, a gauge pipe branched between said fuel tank and said purge valve, and opened to said intake pipe or to atmosphere, and a gauge valve arranged on said gauge pipe and a control device configured to diagnose an abnormality of the evaporation system on the basis of a pressure detection signal of said pressure sensor with said gauge valve opened or closed,said control device further comprising a state detector for detecting the state of a gauge system comprising said gauge valve and said gauge pipe, and correction means for correcting a diagnosis of an abnormality by the control device, based on a state of said gauge system detected by said state detector.