Volkswagen Ag

Jens Wodausch

Björn Fröhlich

Silke Weddig

Florian Zink

Michael Brand

Christian Arenz

Jörg Giere

Christian Jungnickel

Jan Knaup

Florian Imbt

Marcel Leise

Claus-Jürgen Becker

Matthias BÄTJE

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 venting the tank of a vehicle, a device for venting the tank of a vehicle, as well as a vehicle are provided. In this context, the vehicle in which the method is employed has an internal combustion engine that can be operated with a fuel, an air supply system, an exhaust gas system comprising at least an exhaust gas turbocharger, a fuel tank that is designed to supply the internal combustion engine with fuel, and a fuel vapor sorption system. It is provided that, in the method or by means of the device, a drive flow in the air supply system is regulated as a function of an altitude reserve of the exhaust gas turbocharger and as a function of an engine load point, so that the flushing air volume flow of the tank venting system that ensues is determined and can be supplied as a function of an altitude rotational speed of the exhaust gas turbocharger and as a function of the engine load point.

Method and device for venting the tank of a vehicle

A tank venting device for a fuel tank that supplies an internal combustion engine with a fuel includes a fuel vapor sorption system that is configured for reversibly storing fuel vapor in, and removing it from, the fuel tank, wherein the tank venting device includes at least one purge device, which is operable independently of the internal combustion engine, for applying a motive flow to the fuel vapor sorption system in the direction opposite from the fuel tank, so that the fuel vapor sorption system can be purged via a purge line, wherein the purge device includes at least one control device for controlling the motive flow.

Tank venting device for a fuel tank, and vehicle

A tank venting system () for a motor vehicle () has a filter () to filter a venting gas () of a fuel tank () of the motor vehicle (), a pump () to generate a flushing air stream () in order to flush the filter (), and a control unit () that, for purposes of performing a leak test, is configured to detect a pressure signal () that is dependent on the gas pressure (P) present in the fuel tank () and to check whether the pressure signal () meets a prescribed leakage criterion (). The pump () is fluidically interconnected between the filter () and a shut-off valve (), whereby the shut-off valve () is configured to fluidically couple the pump () to an inlet site () of a fresh air system () of an internal combustion engine () of the motor vehicle (), and whereby the control unit () is configured to operate the pump () for flushing the filter () as well as for performing the leak test.

Tank venting system for a motor vehicle as well as motor vehicle and method for operating a tank venting system

A controller for a motor vehicle () has an internal combustion engine (), a transmission (), and a cooling device () with a coolant () for cooling the internal combustion engine (), wherein the controller () is configured to determine a target minimum rotational speed for the internal combustion engine () on the basis of the temperature of the internal combustion engine () and/or the temperature of the coolant () and to determine a target gear setting on the basis of the target minimum rotational speed.

Controller for a motor vehicle, motor vehicle, and method for controlling a motor vehicle

The invention relates to a method for regenerating a particle filter () in an exhaust system () of a motor vehicle () having an internal combustion engine (). Here, for a temperature increase to a temperature (T) required for the regeneration of the particle filter (), a sorption agent container () of a fuel tank () of the motor vehicle () is purged, and the fuel vapours () retained in the sorption agent container (), in particular an activated carbon filter, are supplied directly or indirectly to the exhaust system () upstream of the particle filter (). By means of an exothermic conversion of the fuel vapours () in the exhaust system () upstream of the particle filter (), the exhaust-gas temperature (T) can be increased without the need for engine-internal measures for increasing the exhaust-gas temperature.

Method for regenerating a particle filter, and motor vehicle having a particle filter

A method for venting a fuel tank system of an internal combustion engine is provided, wherein the fuel tank system includes at least a fuel tank, a fuel vapor filter that is fluidically connected to an opening to the environment, a vent line that leads from the fuel tank to the fuel vapor filter, a purge gas line that leads from the fuel vapor filter to a fresh gas tract of the internal combustion engine, a purge gas conveying device that is integrated into the purge gas line, and an exhaust tract with a lambda sensor integrated therein. Control of the purge gas conveying device is carried out based on the measuring signal of the lambda sensor in order to regulate a volume flow of the purge gas in the purge gas line. The method may advantageously be carried out in an internal combustion engine that additionally includes a lambda controller. Since such an internal combustion engine should include a lambda sensor anyway for operating such a lambda controller, the method allows regulation of the venting of the fuel tank system of the internal combustion engine without an additional sensor system, which is advantageous for the manufacturing costs for such an internal combustion engine.

Method for operating an internal combustion engine, internal combustion engine, and motor vehicle

A method for operating an internal combustion engine, which includes at least a combustion engine, a fresh gas line and a fuel tank system. The fuel tank system includes a fuel tank, a fuel vapor filter, a purge gas line that connects the fuel vapor filter to the fresh gas line, and a sensor that is suited for determining a degree of hydrocarbon saturation of purge gas contained in the purge gas line. The fuel tank system also has a tank ventilation valve that is integrated in the purge gas line and/or a purge-gas feed device. In response to a control device, a tank ventilation process is initiated, as needed, for which the purge-gas feed device is operated, and/or the tank ventilation valve is opened; for the tank ventilation process, a hydrocarbon content of the purge gas being ascertained using the sensor. A quantity of fuel to be introduced into at least a combustion chamber of the combustion engine is then adjusted as a function of the ascertained hydrocarbon content. The hydrocarbon content is thereby continuously determined during the tank ventilation process and is utilized to actuate the tank ventilation valve and/or the purge-gas feed device.

Method for operating an internal combustion engine, and internal combustion engine

A method is provided to determine the hydrocarbon content in the purge gas of a fuel tank system of a combustion machine, whereby the fuel tank system comprises at least a fuel tank, a fuel vapor filter that is fluidically connected to an atmospheric port, a vent line leading from the fuel tank to the fuel vapor filter, a purge gas line leading from the fuel vapor filter to the fresh gas line of the combustion machine, a fuel tank vent valve that is integrated into the purge gas line, a pressure sensor that is integrated into the purge gas line and that can be configured as an absolute pressure sensor or as a differential pressure sensor, and a compressor that is integrated into the purge gas line. In this context, it is provided that, during operation of the compressor, at least three pressure measurements are carried out in the purge gas line over a defined period of time by means of the pressure sensor and, only at the end of this period of time, on the basis of the determined pressure values, the loading of the purge gas with hydrocarbons is qualitatively determined in the purge gas that had flowed through the purge gas line during the period of time. Aside from the determination of the quantitative loading, which is preferably carried out parallel to the determination of the qualitative loading, the determination according to the invention of the qualitative loading allows a very precise assessment of the influence that the purge gas&#x2014;which is fed to the fresh gas line of the combustion machine and from there to the internal combustion engine&#x2014;exerts on the combustion processes during operation of the internal combustion engine.

Method for operating a combustion machine, combustion machine and motor vehicle

A method for operating an internal combustion engine which has a number of cylinders and which comprises a fuel system and a fresh air system, whereby fuel is fed in a fuel mass flow via a fuel supply line of the fuel system to the cylinders at a prescribable air-fuel ratio directly by means of the injectors, and fresh air is fed in a fresh air mass flow via a fresh air system, whereby the fuel system comprises a tank venting system with a tank venting line that has a tank venting valve and that, via the interconnected tank venting valve, is connected to at least one line section of the fresh air system via at least one feed point, thereby forming at least one venting path, whereby, owing to a pressure which prevails at the at least one feed point and which is negative relative to the tank venting line and dependent on the load point, the fuel tank of the tank venting system is vented via the at least one venting path, a venting process in which a purging air mass flow containing fuel is removed from the tank venting system and fed to the cylinders as a portion of the fresh air mass flow, so that a total fuel mass flow is fed into the cylinders directly by means of the injectors of the fuel system as well as indirectly via the fresh air mass flow. It is provided that the direct feed of fuel by means of the injector of at least one of the cylinders is blocked, as a result of which a purging air mass flow comprising the fuel volume equivalent that is now absent due to the blocking of the at least one cylinder can advantageously be removed from the tank venting line, while maintaining the prescribed air-fuel ratio via the at least one venting path at the at least one feed point, and this purging air mass flow can be fed as a portion of the fresh air mass flow to the cylinder(s) that is/are still being supplied with fuel.

Method for increasing the quantity of purging air in the tank venting system by completely blocking the injection of at least one cylinder

A tank venting system for an internal combustion engine includes a tank, which is connected via a tank vent to a sorption reservoir for a temporary storage of fuel from a tank venting flow. A purge air pump is provided for feeding regenerated fuel from the sorption reservoir via a purge air flow into an intake air flow to the internal combustion engine. A controller is configured to control the purge air pump in such a way that the purge air flow can be adjusted with regard to its pressure, its mass and/or its volume, thus ensuring that a metering of the regenerated fuel via the purge air flow into the intake air flow takes place in accordance with an operating state of the internal combustion engine. A method for regenerating a sorption reservoir is also provided.

Tank venting system for an internal combustion engine and method for regenerating a sorption reservoir

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.

Growing community of inventors

Braunschweig, Germany

Jens Wodausch