Ventilation arrangement for a fuel tank
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United States of America Patent
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May 12, 2015
Grant Date -
May 9, 2013
app pub date -
Sep 14, 2012
filing date -
Sep 24, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A ventilation arrangement for the head space of the fuel tank of a vehicle comprises a switchable main valve intended for adjusting an arbitrary pressure in the head space of the tank. By way of the opening position of the main valve, a connection between a connection (5) intended for connection to the head space and a connection (6) intended for connection to the surrounding atmosphere is established, wherein the main valve is assigned a pilot valve, which opens during a first path element of a switching movement, wherein the main valve only opens following this first path element. Because of the small cross section of the pilot valve and the pressure relief that materialized through its opening, the switching power can be reduced and a smaller size drive can be employed.
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