Abstract: A method for ascertaining a viscosity of a fuel with the aid of an electric fuel pump which is integrated into a fuel circuit including an overflow valve which includes a permanently open discharge channel, a fuel supply and delivery being adjusted with the aid of the electric fuel pump in the fuel circuit at a specific pressure and the viscosity of the fuel being ascertained by taking into account a delivery rate of the electric fuel pump.

Abstract: A method for ascertaining a viscosity of a fuel with the aid of an electric fuel pump which is integrated into a fuel circuit including an overflow valve which includes a permanently open discharge channel, a fuel supply and delivery being adjusted with the aid of the electric fuel pump in the fuel circuit at a specific pressure and the viscosity of the fuel being ascertained by taking into account a delivery rate of the electric fuel pump.

Abstract: A method for ascertaining a position of a rotor relative to a stator of an electrical machine having a permanently excited rotor and a plurality of windings for the stator or vice versa; in response to an energization of at least one of the windings, a change in an inductance of the winding being ascertained; and, on the basis of the change in the inductance of the winding, the position of the rotor being ascertained relative to the stator.

Abstract: A method for ascertaining a position of a rotor relative to a stator of an electrical machine having a permanently excited rotor and a plurality of windings for the stator or vice versa; in response to an energization of at least one of the windings, a change in an inductance of the winding being ascertained; and, on the basis of the change in the inductance of the winding, the position of the rotor being ascertained relative to the stator.

Abstract: A method for operating a pressure-regulating valve of a fuel injection system of an internal combustion engine of, in particular, a motor vehicle; the fuel injection system including a pressure reservoir for storing pressurized fuel, as well as a feed device for delivering fuel to the pressure reservoir; and fuel being removable from the pressure reservoir via the pressure-regulating valve. In an overrun mode of the internal combustion engine, a delivery quantity of fuel delivered to the pressure reservoir by the feed device is set to a value greater than zero, and that a fuel pressure in the pressure reservoir is ascertained.

Abstract: A method for checking a rail pressure sensor, in which at least two values for the pressure of fuel in a fuel reservoir of an injection system are set on the basis of values for the pressure, which are ascertained by the rail pressure sensor; a desired quantity of fuel to be injected that is demanded by an idle-speed controller being ascertained for each set value of the pressure; and the desired quantities being compared to one another.

Abstract: A method for operating a pressure-regulating valve of a fuel injection system of an internal combustion engine of, in particular, a motor vehicle; the fuel injection system including a pressure reservoir for storing pressurized fuel, as well as a feed device for delivering fuel to the pressure reservoir; and fuel being removable from the pressure reservoir via the pressure-regulating valve. In an overrun mode of the internal combustion engine, a delivery quantity of fuel delivered to the pressure reservoir by the feed device is set to a value greater than zero, and that a fuel pressure in the pressure reservoir is ascertained.

Abstract: A method for checking a rail pressure sensor, in which at least two values for the pressure of fuel in a fuel reservoir of an injection system are set on the basis of values for the pressure, which are ascertained by the rail pressure sensor; a desired quantity of fuel to be injected that is demanded by an idle-speed controller being ascertained for each set value of the pressure; and the desired quantities being compared to one another.

Abstract: A method and a device for controlling a fuel metering system are described. The fuel metering system includes at least one injector for injecting fuel into an internal combustion engine. An electric current value is applied to the at least one injector, and a rail pressure value is determined based on the electric current value.

Abstract: A method and a device for controlling a fuel metering system are described. The fuel metering system includes at least one injector for injecting fuel into an internal combustion engine. An electric current value is applied to the at least one injector, and a rail pressure value is determined based on the electric current value.