A control process for the automatic closing of a convertible top of a motor vehicle. Novel aspects of the invention include design of the modules and their interconnection and interoperability, as well as improved operation techniques applicable to UPS systems generally. A portable device forms another part of the system for receiving the data signal relating to the operational parameter for use by the portable device. An optical detection system images the spatial light modulator to an optical detector array. The method may further include computing a feature resource estimate for the feature using each task resource estimate and the feature category value.