Force sensor systems especially for determining dynamically the axle load, speed, wheelbase and gross weight of vehicles
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United States of America Patent
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-
Mar 26, 1996
Issued Date -
N/A
app pub date -
Jun 22, 1994
filing date -
Dec 19, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention comprises a force measuring system and an assembly procedure for the dynamic determination especially of axle loads, speed, as well as for assembly of force and acceleration sensors. The force measuring system can be laid permanently in the roadway. It is of modular assembly, consisting of the amplifier, sensor and terminal module. The sensor module consists of a hollow section, in which piezo-elements are fitted under elastic preload. The hollow section is designed so that it can be opened elastically by lateral clamping, to allow mechanically interconnected piezo-elements to be inserted simply. After releasing this clamping, the piezo-elements are under high elastic preload. The same design principle can also be applied generally to force pressure and acceleration sensors. The elastical clamping force, vital for perfect force transmission to the piezo-elements, is for assembly purposes easily overcome by a proper lateral clamping force.
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