| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a device for detecting an evaporating fuel gas leak capable of performing the leak detection of a evaporation purge system including a fuel tank and a canister during the idle operation of an internal combustion engine. <P>SOLUTION: This device is provided with a jet pump 8 pressurizing the evaporation purge system by introducing open air to the evaporation purge system including the fuel tank 1 by a gasoline flow of a fuel pump 2, an inner pressure sensor 11 measuring the inner pressure of the evaporation purge system, a reference orifice 21 capable of being controlled to open and close and leaking through a reference leak hole, and a memory means storing a pressure variation at the time of opening the reference orifice 21 beforehand and pressurizing for a predetermined time by the jet pump 8 as an initial curve. The existence of leak is determined by comparing a time series of an initial curve and a time series of a pressure curve provided by pressurizing by the jet pump 8 for the predetermined time under a condition of fully closing the evaporation purge system during idle operation. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
