System and method for performing evaporative leak diagnostics in a vehicle
US8725347B2 · kind B2 · utility
10Cited by
48References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2013 |
| Grant date | May 13, 2014 |
| Priority date | — |
| Expiry date | Sep 12, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is provided for performing an evaporative leak diagnostic for a vehicle. A valve in a diagnostic module is commanded to a vent position. The valve connects a fuel system to atmosphere. A pump in the diagnostic module is operated to measure a reference pressure across an orifice in the diagnostic module to provide a threshold. The valve is commanded to a test position. The pump is operated to place the fuel system in a low pressure state. A series of pressures in the fuel system is measured. A diagnostic code is provided after comparing the series of pressures to the threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.