Method and device for diagnosing the operational state of a fuel supply system of an automobile internal combustion engine
AssigneeRENAULT s.a.s.
InventorsNicolas Protin, Michel Leporcq
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for diagnosing the operational state of a fuel supply system of an automobile internal combustion engine, said fuel being stored in a tank of the vehicle and having a variable alcohol content, wherein said method includes a step of diagnosing (S6) the operational state of the fuel supply system, a step of detecting the addition of alcohol into the tank (S2), a step of determining the alcohol content (S2bis) in the fuel, and a checking step (S4) in which the diagnosis step (S6) is triggered if the step of determining the alcohol content (S2bis) in the fuel is completed.
Claims8
A method for diagnosing the operational state of a motor vehicle internal combustion engine fuel supply system, said fuel being stored in a tank of the vehicle and containing a variable alcohol content, the method comprising a step (S6) of diagnosing the operational state of the fuel supply system, a step (S2) of detecting an addition of fuel to the tank, a step (S2a) of determining the alcohol content of the fuel, and a checking step (S4) in which the diagnostics step (S6) is initiated if the step (S2a) of determining the alcohol content of the fuel is finished, characterized in that it comprises a step (S3) of detecting an evaporation of the fuel diluted in the engine oil and, during the checking step (S4), the diagnostics step (S6) is initiated if evaporation of the fuel diluted in the engine oil is not detected.
A device for diagnosing the operational state of a motor vehicle internal combustion engine (3) fuel supply system (2), said fuel being stored in a tank of the vehicle and containing a variable alcohol content, the device comprising a diagnostics means for diagnosing the operational state of the fuel supply system, a detection means for detecting an addition of fuel to the tank, a determining means for determining the alcohol content of the fuel and a checking means for activating the diagnostics means if the determining means has determined the alcohol content of the fuel, characterized in that it comprises a second detection means for detecting evaporation of the fuel diluted in the engine oil, the checking means being capable of activating the diagnostics means if the second detection means does not detect evaporation of the fuel diluted in the engine oil.
Dependencies are inferred from the claim text.