METHOD AND DEVICE FOR ERROR DIAGNOSIS IN AN ENGINE SYSTEM WITH VARIABLE VALVE CONTROLS

A method is described for diagnosing the functioning of one or more variably triggerable intake valves and/or exhaust valves in an internal combustion engine, including the following steps:-determining a modeled pressure value which provides a pressure value in an air system of the internal combustion engine, the pressure variation model describing a pressure variation of an error-free internal combustion engine as a function of the operating point; providing a value for the actual instantaneous pressure in the air system; ascertaining a deviation variable as a function of the modeled pressure value and a value for the actual pressure in the air system; detecting an error in the functioning of the intake valve and/or the exhaust valve as a function of the deviation variable.