Ventilation device for the fuel tank of a motor vehicle

Details Ventilation device for the fuel tank of a motor vehicle Ventilation device for the fuel tank of a motor vehicle

1984-12-20

1987-04-21

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123458, 123516, F02M 3900

Patent

active

046587977

ABSTRACT:
A ventilation device for the fuel tank of a motor vehicle is provided with ventilation line (3) which connects the tank with the atmosphere by means of a fuel vapor filter. For regenerating purposes, the filter 4 is connected to the intake system 6 of the vehicle combustion engine 1 by means of a filter exhaust line (5), so that air is taken in through filter 4 when the combustion engine 1 is in operation and thereby the fuel accummulated in the filter is removed. In order to prevent the collection of fuel vapors in the intake system 6 when the combustion engine is not in operation and in particular to prevent the enrichment of the fuel-air mixture through the exhaust line while the combustion engine is off, a valve 7 is provided in the exhaust line 5 which is closed when the combustion engine 1 is off and which opens the exhaust line 5 increasingly in accordance with the increased rotational speed, so that only a low amount is suctioned at a low rotational speed, but at a certain rotational speed sufficient air is taken in through the filter 4 thereby effectively regenerating the same.

REFERENCES:
patent: 3680318 (1972-08-01), Nakajima
patent: 3690307 (1972-09-01), O'Neill
patent: 4013054 (1977-03-01), Balsley
patent: 4343281 (1982-08-01), Vozumi
patent: 4377142 (1983-03-01), Otsuka
patent: 4467769 (1984-08-01), Matsumura
patent: 4475507 (1984-10-01), Miyaki
patent: 4527532 (1985-07-01), Kasai
Research Disclosure No. 17419, Disclosed Anonymously, "Vapor Purge Control", Oct. 1978.

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