System and method for performing evaporative leak diagnostics in a vehicle
US8560167B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2012 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Feb 7, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vehicle is provided with a fuel system, a controller, and a diagnostic module with an orifice, a pressure sensor, and a pump, the module connecting the fuel system to atmosphere. The controller measures a reference pressure across the orifice to provide a threshold, isolates the fuel system, and provides a code in response to comparing a series or measured pressures to the threshold. A method for performing an evaporative leak diagnostic is provided. A valve in a diagnostic module is commanded to a vent position. A pump is operated to measure a reference pressure across an orifice to provide a threshold. A valve is commanded to a test position. The pump is operated to place the fuel system in a low pressure state, and 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.