Method for diagnosing a tank venting valve

Details Method for diagnosing a tank venting valve Method for diagnosing a tank venting valve

2006-10-17

2006-10-17

Dolinar, Andrew M. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C073S118040

Reexamination Certificate

active

07124018

ABSTRACT:
A method for testing the operability of a tank venting valve between an internal combustion engine and a fuel vapor storage device of a motor vehicle. The stored fuel vapor from the fuel vapor storage device is fed to the internal combustion engine when the tank venting valve is open and a reaction from a fuel/air control loop is analyzed to diagnose the operability of the tank venting valve. In order to refine the method so that a diagnosis that is as far as possible not subject to error may be performed when not idling, the stored fuel vapor from the fuel vapor storage device is fed to the internal combustion engine at least twice in one driving cycle while the tank venting valve is open, a reaction of the fuel/air ratio control loop being detected each time and the operability of the tank venting valve being inferred by comparing the detected reactions.

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