| 摘要 |
<p>The invention relates to a method for diagnosing a leakage in a vessel, which vessel is provided with an electric pump for pressurising the vessel, a sensor for measuring a drive current used for driving the pump and generating a current signal, an electronic control unit for sampling, storing and analysing said drive current signal. The method involves the following steps: measuring a reference drive current (Iref) for a known operating condition; pressurising the vessel and sampling the drive current (I(n)) until at least one predetermined condition is fulfilled; calculating an area ratio (AK=A1/A2), as a ratio of the difference between an integrated value of a relative drive current for a predetermined number of samples (Aint) and an integrated value of an ideal drive current using an initial and a current drive current sample (A2), over said integrated value of an ideal drive current (A2); comparing at least the area ratio (Ak) as a function of a further parameter with a reference level, when at least one predetermined condition is fulfilled, to determine if a leakage is present. The invention further relates to an apparatus for performing the method. <IMAGE></p> |
