Method for small leak testing of an evaporative emissions system
US10481043B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 2017 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | Apr 6, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/3272
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for small leak testing of an evaporative emissions system includes monitoring a vacuum pressure level of the evaporation emissions system with the engine on and actuating a canister vent valve to regulate the vacuum pressure level to a predetermined minimum vacuum pressure level. Upon turning the engine off, the canister vent valve and a canister purge valve are closed to seal the evaporative emissions system. Next, the vacuum pressure level is recorded over a predetermined time period after turning off the engine and a fault code is set when the vacuum pressure level becomes less than the predetermined minimum vacuum pressure level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.