Patent ID: 9447755
Filing Date: 2016-09-20
CPC Classification: B60K,F02M,Y10T

Claim Text:
1. 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.