Ansaugdiagnose for Zündaussetzmotor

A variety of methods and arrangements for detecting disturbances of the instructed air intake into an internal combustion engine will be described. In some embodiments, the intake manifold pressure is monitored. A Luftansaugereignis generates a fluctuation is recorded intake manifold pressure. The signal is processed by a diagnostic filter to assist in determining whether the actual intake matches the commanded intake. In other embodiments, the measured crankshaft acceleration is compared with the estimated crankshaft acceleration. When the two quantities differ by a threshold amount, a suction error is detected. The two detection methods may also be combined. The approaches described are particularly well suited for use in engines that are operated in a Zundaussetzbetrieb with cylinder deactivation and / or a dynamic Zundniveaumodulationsmodus.