A process is provided for estimating temperatures in an enclosure during a combustion process. It comprises a component signal composer arranged to generate a number of parallel component signals that differ in phase from each other. Weight sensors assigned to the rear supports are arranged in the force path below the seat belt anchorage points and above the seat rail. The reference structure is aligned with the mounting structure at a second relative orientation, the first and second relative orientations defining the desired relative orientation of the micro-object and the mounting structure.