Siemens Aktiengesellschaft

Stefan Schneider

Hong Zhang

Klaus Bayerle

Anton Angermaier

Maximilian Engl

Klaus Neumann

In order to regenerate an activated carbon filter which is seated in a tank vent line, during idling of the internal combustion engine the regeneration valve is brought into the maximum open position, and the throttle valve is simultaneously opened slightly. This produces a higher air mass flow in the intake tract of an internal combustion engine, and the proportion of hydrocarbons introduced by the regeneration remains constant. In order to keep the idling speed of the internal combustion engine constant, a torque reserve is built up, for example by adjusting the ignition angle.

Method for regenerating an activated carbon filter loaded with hydrocarbons

Nonconcentricity or lack of smoothness values are proportional to the change in angular speed of the crankshaft. Deviation values that are proportional to the cyclical combustion fluctuations are ascertained, after the nonconcentricity values of successive combustion cycles are averaged, by comparison of the current nonconcentricity value with the associated mean value. Then the deviation quantity is compared with an individual-cylinder-specific limit value, and cyclical combustion fluctuations are deduced if the deviation quantity exceeds a limit value.

Method for detecting cyclical combustion fluctuations in an internal

A diagnostic device for monitoring an exhaust gas recirculation system determines a diagnostic value of the exhaust gas recirculation system without influencing the operation of the internal combustion engine. The diagnostic value depends on the intake pipe pressure and an observer intake pipe pressure. The latter is determined by an observer from one or more further operating variables of the internal combustion engine. The diagnostic device determines that the exhaust gas recirculation system is defective when the diagnostic value lies outside a range of values that depend on at least one operating variable.

Diagnostic device for monitoring an exhaust gas recirculation system of

A Method for tank venting in an internal combustion engine includes ascertaining a degree of loading of an activated carbon filter. A desired flushing flow is calculated and a pulse duty factor for a tank venting valve is set depending on the level of the degree of loading and a predefined value for a maximum possible fuel mass flow through the tank venting valve. This is done as a function of the desired flushing flow, the temperature of a flushing stream and a pressure gradient at the tank venting valve, in such a way that the lambda deviation, brought about by a flushing procedure, of a lambda controller of the lambda control device, does not exceed a predefined maximum value.

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Wenzenbach, Germany

Stefan Schneider