Water-in-fuel detection

摘要

A method for operating a vehicle having a fuel system 100 that may be contaminated with water is described. The method includes, adjusting an operating parameter such as a diagnostic code or illumination state of a dashboard light in response to a relative amount of high and low readings from a water-in-fuel sensor 14 coupled in the fuel system 100. Using a relative amount/number of high and low readings, rather than a single high/low reading, avoids warnings being indicated to a driver/user during transient conditions while fuel may be sloshing. A duty cycle of high and low readings may be considered during transient fuel system conditions. The arrangement may have a first relative amount during transient conditions (when the vehicle is moving or moving at a speed above a threshold) and a second relative amount for static/idle conditions. The system may further comprise a fuel-water separator.