Method of checking the operability of a regeneration valve in a

Details Method of checking the operability of a regeneration valve in a Method of checking the operability of a regeneration valve in a

1994-03-02

1995-08-01

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123520, F02M 3302

Patent

active

054372569

ABSTRACT:
The invention relates to a method for checking the operability of a cyclically controlled regeneration valve in a tank venting system of a motor vehicle which utilizes the realization that during operation of the system significant pressure variations are generated in a discharge line arranged between an adsorption filter and the regenerating valve whenever the duty ratio of the regeneration valve is within a certain range. If the regeneration valve is operated at such a duty ratio, the pressure variations in the discharge line are recorded and the extreme pressure valves are determined in an evaluation device for a specified time period after which the difference between the maximum and the minimum pressures is determined and if this difference is below a predetermined threshold, the regeneration valve is indicated as being defective.

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patent: 5158054 (1992-10-01), Otsuka
patent: 5193512 (1993-03-01), Steinbrenner et al.
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patent: 5267470 (1993-12-01), Cook
patent: 5275144 (1994-01-01), Gross
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patent: 5333590 (1994-08-01), Thomson
patent: 5339788 (1994-08-01), Blumenstock et al.
patent: 5349935 (1994-09-01), Mezger et al.
patent: 5386812 (1995-02-01), Curran et al.

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