Method for monitoring a tank venting system that traps fuel vapo

Details Method for monitoring a tank venting system that traps fuel vapo Method for monitoring a tank venting system that traps fuel vapo

1994-07-21

1996-03-19

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

F02M 3302

Patent

active

054996139

ABSTRACT:
A tank venting system for trapping fuel vapors and feeding the fuel vapors to an internal combustion engine having a fuel tank and an intake tube, includes a container adsorbing fuel vapors. A venting line is connected between the fuel tank and the container. A regeneration line is connected between the container and the intake tube of the internal combustion engine. A ventilation line communicates with the atmosphere and the container. A ventilation valve closes the ventilation line. A tank venting valve is disposed in the regeneration line and is triggered in an opening direction for feeding fuel vapors stored in the container. A pressure sensor detects a system pressure of the tank venting system. A method for monitoring the tank venting system includes monitoring the system pressure with the pressure sensor during the feeding of the fuel vapors, categorizing the ventilation valve as functioning improperly if a predetermined pressure threshold value is exceeded, and closing the tank venting valve.

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