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US 8,607,765 B2Granted
Method for adjusting pressure in a fuel tank and a fuel tank system
AssigneeAudi AG
InventorHarald Hagen
Life of this patent
Estimating the term…
Abstract
A method and a fuel tank system for adjusting a pressure in a fuel tank are described. Evaporated fuel tank escapes from the fuel tank under overpressure with respect to the ambient and is transferred to a temporary storage for at least one substance of the evaporated fuel. A venting means, through which the evaporated fuel escapes, is controlled by at least one parameter different from a pressure or at least one information provided in form of data. The pressure in the fuel tank can thereby be more variably adjusted.
Claims5
A method for setting a pressure in a fuel tank, comprising the steps of:
- providing a proportional valve for transferring evaporated fuel from the fuel tank under overpressure with respect to ambient pressure to a temporary storage for at least one substance of the evaporated fuel;
- and
- controlling the proportional valve depending on an air-fuel ratio measured by a probe located downstream of the temporary storage, in relation to a flow direction of the fuel vapor from the fuel tank through the proportional valve to the temporary storage.
A fuel tank system, comprising
- at least one fuel tank for a combustible fuel;
- a temporary storage for temporary storage of at least one evaporated substance of the fuel;
- a proportional valve connected between the fuel tank and the temporary storage;
- a transfer line for transferring to the temporary storage fuel vapor which passed through the proportional valve from the fuel tank at an overpressure with respect to ambient pressure;
- and
- a control device controlling the proportional valve depending on an air-fuel ratio measured by a probe located downstream of the temporary storage, in relation to a flow direction of the fuel vapor from the fuel tank through the proportional valve to the temporary storage.
3 more elements
Dependencies are inferred from the claim text.