Mercedes-benz Aktiengesellschaft

Daimler Chrysler Ag

Peter Lautenschutz

Gregor Renner

Dieter Kalweit

Gunter Karl

Johannes Leweux

Anton Waltner

Rudolf Klein

Peter Klein

Christoph Lux

Stephan Kramer

Klaus Rossler

Herwig Biesinger

Alexander Anderson

Matthias Schumacher

Heiko Flebbe

Method for increasing the safety of motor-vehicle occupants in the event of a crash

The invention provides a method for shutting down and restarting individual cylinders of a multicylinder internal combustion engine by deactivating the charge change valves and the fuel injection. According to the invention, in shutting down a selected cylinder, the exhaust valve is disconnected first in all cases. Thereafter, the intake valve and fuel injection for the selected cylinder are controlled such that the last fuel injection into that cylinder takes place immediately before the last intake cycle. When a cylinder is restarted, the exhaust valve is always operated first, and only thereafter is the intake valve opened, with the first fuel injection always taking place immediately before the first intake cycle.

Method for shutting down and restarting individual cylinders of an engine

The invention provides a process for diagnosing defects in an exhaust gas recirculation device of an internal-combustion engine system having an engine timing gear with a knock control. According to the invention, the firing point is advanced until a predetermined minimal knock control displacement is reached, at a time when the engine is operating in steady-state conditions and the exhaust gas recirculation device is active. Subsequently, the exhaust gas recirculation rate is reduced while the advanced firing point is maintained, and it is determined whether the knock control frequency or the knock control displacement change. If not, a defect in the exhaust gas recirculation device is concluded.

Process for diagnosing defects of an exhaust gas recirculation device

Growing community of inventors

Plochingen, Germany

Peter Lautenschutz