Method and arrangement for checking the tightness of a vessel
US6550315B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Apr 13, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0818
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An active charcoal filter (20) of a tank-venting system stores fuel vaporizing in a tank (10). In order to check the operability of the tank-venting system, a leakage diagnostic unit (60) having a pump (50) is provided wherein the pump (50) is connected downstream of a switchover valve (70). A reference leak (81) is arranged parallel to the switchover valve (70). The switchover valve (70) includes two switching positions I and II. In the position I, the pump (50) is pressure-conductively connected to the line (80) and then pumps ambient air into the line (80) through the reference leak (81). The pumped flow, which is present at the output (51) of the pump (50), is, in the position I of the switchover valve (70) pure ambient air and, in the position II of the switchover valve (70), is air cleaned by the active charcoal filter (20). The pumped flow can therefore be outputted to the ambient of the vehicle via a line (52) without problems for the environment. Alternatively, the pumped flow at the output (51) of the pump (50) can be supplied to the intake manifold (40) via a return line. The tightness check takes place by detecting the current, which is to be supplied to the pump motor,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.