Volkswagen Ag

Michael Brand

Jens Wodausch

Björn Fröhlich

Silke Weddig

Michael Lindlau

Christian Arenz

A method for controlling a control valve, the control valve controlling a volume flow of a fluid along a line, the method including at least the following steps: (a) performing a closing operation of the control valve; (b) measuring a pressure profile upstream of the control valve; and (c) determining a density of the fluid.

Method for controlling a control valve

A method for operating an internal combustion engine is provided, which has a combustion unit, including a combustion chamber; a fresh gas tract; an exhaust tract, including an exhaust gas sensor integrated therein; and a fuel tank system. During an operation of the internal combustion engine, while purge gas is conducted via a purge gas line a hydrocarbon content of the purge gas is ascertained with the aid of the HC sensor, and the mass flow of the purge gas is also ascertained, and a fuel mass flow introduced into the fresh gas tract is ascertained from these values in combination and a quantity of fuel introduced into the combustion chamber and/or into the fresh gas tract with the aid of at least one fuel injector is adapted.

Method for operating an internal combustion engine, including an HC sensor integrated into a purge gas line

A method for operating a drive system of a motor vehicle having a combustion engine, a fuel tank, and an evaporative emission control system, includes the following steps: opening a canister-purge valve of the evaporative emission control system; using a first sensor of the motor vehicle designed as a pressure sensor to ascertain an evaporative emission control system pressure prevailing in the evaporative emission control system between a filter device of the evaporative emission control system and the canister-purge valve; using a measurement device of the motor vehicle to ascertain an ambient pressure of the motor vehicle; using a computational device of the motor vehicle to compute a flow volume of a fluid streaming through the canister-purge valve on the basis of the ascertained evaporative emission control system pressure and the ascertained ambient pressure; and using an engine control device of the drive system of the motor vehicle to operate the drive system taking into account the computed fluid flow volume.

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Wolfsburg, Germany

Michael Brand