Method for checking the gastightness of a motor vehicle tank ventilation system
US7418856B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2006 |
| Grant date | Sep 2, 2008 |
| Priority date | — |
| Expiry date | Sep 14, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method for checking the gastightness of a motor vehicle tank ventilation system consisting essentially of a fuel tank, an adsorption filter, a ventilation line with a pressure sensor, a fresh air line with an adsorption filter check valve (AAV), and a regeneration line with a tank ventilation valve (TEV) to the internal combustion engine. To compensate for the outgassing of fuel, the total diagnosis time tD is formed from the negative pressure buildup time t1 and the negative pressure decay time t2 as a measure of the tightness of the tank ventilation system and is compared to a corresponding diagnosis time threshold tDS.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.