Force sensor systems especially for determining dynamically the axle load, speed, wheelbase and gross weight of vehicles
US5265481A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Dec 23, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G19/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention comprises a force measuring system for the dynamic determination especially of axle loads, speed, vehicle wheelbase and gross weight. The force measuring system is laid permanently in the roadway. It is of modular assembly, consisting of the amplifier (11), sensor (12) and terminal module (13). The individual modules may be coupled tightly by plug-and-socket connections, welding flanges or glued flanges. The sensor module (12) consists of a hollow section (1), in which piezo-elements (4) are fitted under elastic preload. The piezo-elements (4) are accommodated in the hollow section (1) at intervals of typically 5 to 10 cm, and they may be connected all together with only one electrically conductive foil (5) to the signal processing facility (19), or groupwise or even singly. According to this subdivision the road width can be sectioned as desired, in order to obtain a road loading diagram for instance. The hollow section is designed so that it can be opened elastically by lateral clamping, to allow mechanically interconnected piezo-elements (4) to be inserted. After releasing this clamping, the piezo-elements (4) are under high elastic preload. In this way any toleran…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.