Abstract: A method for increasing the measuring accuracy for a limited path is described, where a map of the actual geometric path that is stored in a memory is obtained in a “learning phase.” In addition, a method for better controlling a camshaft offset in a combustion engine is described.

Abstract: A method for increasing the measuring accuracy for a limited path is described, where a map of the actual geometric path that is stored in a memory is obtained in a “learning phase.” In addition, a method for better controlling a camshaft offset in a combustion engine is described.

Abstract: A system for monitoring suction leakage of external air into the exhaust gas path of an internal combustion engine during intermittent reduced pressure phases of the engine, during operation, includes an oxygen concentration sensing lambda probe arranged in the path. The probe issues an output signal having a reduced pressure phase pulsation frequency component of reduced pressure phase amplitude indicative of such oxygen concentration during the reduced pressure phases. The output signal is fed to a control device which generates an error signal when that amplitude exceeds a predetermined threshold level indicative of suction entry of external air into the path during a reduced pressure phase.