| 摘要 |
The invention relates to a method and device for conducting a leak test of a reservoir (10), especially of a tank ventilation system of a motor vehicle. According to the invention, the reservoir (10) is subjected to the action of a pressure generated by means of a motor-driven pressure source (30), whereby the motor current is determined at the same time. A reference leak (36), which can be operated as desired by means of a change-over valve (32), is subjected to the action of a corresponding pressure, whereby the motor current is additionally determined at the same time. The determined electric characteristic quantity and the determined reference characteristic quantity are compared and the existence of a leak is established from this comparison. The aim of the invention is to prevent moisture from entering the pressure source (30). To this end, at least the pressure source (30) is heated at least occasionally. The heating is preferably effected by controlling the change-over valve (32) with a suitable pulse duty factor. In order to prevent moisture from entering the pressure source (30), a check valve (44) is provided that is integrated in the connection part of the pressure source (30).
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