Abstract: The invention relates to a surveillance device for installation in a domestic property, comprising event execution means and processing means for generation of commands for at least one event reaction body, characterised in comprising a network (6) of cooperating non-hierarchical modules (1,2,3,4), each comprising detection data processing means (8) and internal communication means (9), configured for exchange of surveillance data between modules. The invention further relates to a surveillance installation comprising several such devices.

Abstract: There is disclosed an electronic dual-fuel injection system for an internal combustion engine having a cylinder block with driving cylinders. The system has an intake manifold which is connected to the driving cylinders to feed fuel mixtures to the cylinders and an air supply assembly including a shuttle-valve body connected to the manifold for feeding air into it. A high grade fuel supply assembly, which includes an injector mounted on the output section of the air supply assembly, serves for feeding high grade fuel to the manifold. A similar but low grade fuel assembly, which includes a plurality of injectors each of which is mounted on the manifold, serves for feeding low grade fuel to one of the driving cylinders. The injection system also includes a computer, connected to the two fuel supply assemblies, and temperature sensors connected to the computer and to the cylinder block to measure its temperature.