System of force sensors, especially for dynamic determination of axial charge, speed, axial distance and total weight of vehicles

摘要

The invention comprises a system of force sensors, especially for the dynamic determination of the axle load, speed, axle base and total weight of vehicles. The system of force sensors is laid permanently in the roadway. It is composed in a modular manner of the amplifier module (11), the sensor module (12) and the output module (13). The individual modules can be coupled tightly by means of plug connections, welded flange connections or bonded flange connections, with the result that lengths according to the roadway widths are obtained. The sensor module (12) consists of a hollow section (1), in which piezoelectric elements (4) are installed under elastic prestress. The piezoelectric elements (4) are accommodated in the hollow section (1) at spacings of, for example, 5 to 10 cm and can be connected as a whole by means of only one electrical conductive foil (5) or connected in groups or singly to the signal-processing unit (19). The road width can be subdivided, as required, according to the subdivision, for example in order to prepare the road load diagram. The hollow sections are so designed that they can be opened elastically by means of lateral clamping in such a way that a simple introduction of the mechanically interconnected piezoelectric elements (4) becomes possible. After this clamping has been released, the piezoelectric elements (4) are under high elastic prestress. Consequently, any tolerance errors can be overcome, and therefore there is no need for expensive mechanical machining, and all parts with standard tolerances can be used. IMAGE