Patent ID: 11898507
Assignee: VITESCO TECHNOLOGIES GMBH
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A method for determining a loading of a fuel vapor retention filter in a fuel evaporation retention system of an internal combustion engine, the method comprises:
providing a fuel storage tank for storing fuel;
providing a connecting line, the connecting line coupling the fuel storage tank to the fuel vapor retention filter;
providing a regeneration line, the regeneration line coupling the fuel vapor retention filter to an intake tract of the internal combustion engine and having an electrically controllable flow control valve;
providing a venting line, the venting line coupling the fuel vapor retention filter to the atmosphere;
providing an electrically activatable purge air pump arranged in the regeneration line, such that purge air can be conducted through the fuel vapor retention filter and supplied to the intake tract for regenerating the fuel vapor retention filter;
switching on the purge air pump with the flow control valve closed;
upon reaching a constant rotational speed of an impeller of the purge air pump conveying the purge air:
detecting a value for a pressure in the regeneration line upstream of the purge air pump, and
detecting a value for the pressure in the regeneration line downstream of the purge air pump;

determining a value for a differential pressure across the purge air pump based on the pressure values; and
assigning a value for a degree of loading of the fuel vapor retention filter to the value for the differential pressure;
wherein the method is carried out during one or more predetermined periods of time and/or one or more predetermined operating phases of the internal combustion engine and the respectively determined degrees of loading of the fuel vapor retention filter are taken into account in the injection calculation of the internal combustion engine,
wherein at least one of the periods of time is a heating phase of the fuel storage tank or a cooling-down phase of the fuel storage tank.