Abstract: The invention relates to an apparatus for measuring the cylinder internal pressure of internal combustion engines and, in particular, of gas engines, said apparatus having a first valve (5) which opens into the cylinder interior space, a measurement chamber (6) which can be connected to the cylinder interior space (1a) and can be disconnected from the latter by means of the first valve (5), and a pressure sensor (8) which is arranged in the region of the measurement chamber (6) in order to measure the pressure in the cylinder interior space when the first valve (5) is open. Permanent operation without thermal overload is enabled in such a way that at least one second valve (13) is provided in the region of the measurement chamber (6), said second valve being able to be changed to a closed position at least when the first valve (5) is open in order to seal off the measurement chamber (6) towards the outside.

Abstract: The life of a sensor unit is very strongly dependent on the loading of the sensor unit during use. The life of a sensor unit is generally specified in a number of loading cycles, however, which does not take into consideration the loading of the sensor unit. The invention therefore specifies a method and apparatus for assessing the residual life of a sensor unit which takes into consideration the actual loading of the sensor unit and therefore the residual life of the sensor unit can be estimated more precisely by virtue of a damage factor (S) being determined for the loading of a loading cycle (B) and the loading cycle (B) being weighted therewith.

Abstract: The invention relates to an apparatus for measuring the cylinder internal pressure of internal combustion engines and, in particular, of gas engines, said apparatus having a first valve (5) which opens into the cylinder interior space, a measurement chamber (6) which can be connected to the cylinder interior space (1a) arid can be disconnected from the latter by means of the first valve (5), and a pressure sensor (8) which is arranged in the region of the measurement chamber (6) in order to measure the pressure in the cylinder interior space when the first valve (5) is open. Permanent operation without thermal overload is enabled in such a way that at least one second valve (13) is provided in the region of the measurement chamber (6), said second valve being able to be changed to a closed position at least when the first valve (5) is open in order to seal off the measurement chamber (6) towards the outside.

Abstract: The life of a sensor unit is very strongly dependent on the loading of the sensor unit during use. The life of a sensor unit is generally specified in a number of loading cycles, however, which does not take into consideration the loading of the sensor unit. The invention therefore specifies a method and apparatus for assessing the residual life of a sensor unit which takes into consideration the actual loading of the sensor unit and therefore the residual life of the sensor unit (10) can be estimated more precisely by virtue of a damage factor (S) being determined for the loading of a loading cycle (B) and the loading cycle (B) being weighted therewith.