Method for testing the function of a pressure switch of a tank ventilation system, control device, and internal combustion engine
US8161948B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 27, 2007 |
| Grant date | Apr 24, 2012 |
| Priority date | — |
| Expiry date | Oct 5, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0818
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The switched state of a pressure switch in a tank ventilation system of a motor vehicle is used for testing the function of the tank ventilation system, the pressure switch being in a low-pressure position if the pressure in the tank ventilation system is lower than a predefined pressure limit while being in a high-pressure position if that is not the case. A defective pressure switch can result in wrong assessments. Disclosed is a method for testing the function of the pressure switch, the method encompassing the following steps: a switched state of the pressure switch is detected; a measure is carried out that increases the pressure in the tank ventilation system above the pressure limit if the pressure switch is in the low-pressure position; a defect of the pressure switch is identified if the pressure switch remains in the low-pressure position after carrying out the measure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.