Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1994-04-20
1995-12-19
Moulis, Thomas M.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
F02M 3302, F02B 7708
Patent
active
054760836
ABSTRACT:
The invention is directed to a method for checking the operability of a tank-venting valve which is connected in a venting line of a tank-venting apparatus between the intake pipe of the internal combustion engine and an adsorption filter equipped with a venting line. The tank-venting valve can be driven into two switching states, namely, an open state and a closed state. The method includes the steps of: driving the tank-venting valve to reach one of the two selectable switching states; checking the pressure on the end of the tank-venting valve facing away from the intake pipe and checking whether this pressure exhibits a time-dependent trace as it cannot occur in the desired switching state; and, concluding that a defect in the tank-venting valve is present when the condition checked in the previous step is satisfied. With this method, the operability of a simple tank-venting valve can be reliably checked. The method requires no special mechanical, capacitive or inductive checking arrangement.
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Moulis Thomas M.
Ottesen Walter
Robert & Bosch GmbH
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