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US 9,447,755 B2Granted
Method for operating a fuel system, and fuel system
AssigneeAudi AG
InventorHarald Hagen
Life of this patent
Estimating the term…
Abstract
In a method for operating a fuel system of an internal combustion engine, the fuel system has a fuel tank and a ventilation device, which has at least one vent valve, for ventilating the fuel tank. The magnitude of deformation caused by an internal pressure of the fuel tank of a deformation zone of the fuel tank is ascertained and the vent valve is opened when the magnitude of deformation exceeds a limit value.
Claims10
A method of operating a fuel system of an internal combustion engine, comprising:
- fluidly connecting a ventilation device of the fuel system via a vent line with a fuel tank of the fuel system for ventilation of the fuel tank;
- providing an actuator for actuating a first vent valve of the ventilation device;
- connecting in parallel to the first vent valve two overflow valves configured to enable opposite throughflow directions and to open or close a throughflow in dependence on a pressure differential between a first section of the vent line on one side of the first vent line and a second section on an opposite side of the first vent valve;
- ascertaining a magnitude of deformation of a deformation zone of the fuel tank as caused by an internal pressure of the fuel tank;
- opening a second vent valve of the ventilation device when the magnitude of deformation exceeds a limit value;
- and
- mechanically transmitting the deformation of the deformation zone to the second vent valve so that the deformation causes a force to open the second vent valve.
4 more elements
A fuel system of an internal combustion engine, comprising:
- a fuel tank;
- a ventilation device for ventilating the fuel tank, said ventilation device including first and second vent valves, and a vent line in fluid communication with the fuel tank;
- an actuator configured to actuate the first vent valve;
- and
- two overflow valves connected in parallel to the first vent valve and configured to enable opposite throughflow directions and to open or close a throughflow in dependence on a pressure differential between a first section of the first vent line on one side of the vent line and a second section on an opposite side of the first vent valve;
- wherein a magnitude of deformation of a deformation zone of the fuel tank as caused by an internal pressure of the fuel tank is ascertained and the second vent valve of the ventilation device is opened when the magnitude of deformation exceeds a limit value, wherein the deformation of the deformation zone is mechanically transmitted to the second vent valve so that the deformation causes a force to open the second vent valve.
3 more elements
Dependencies are inferred from the claim text.