Bulk haulage operators constantly run the risk of prosecution for vehicle overloading (or poor load distribution)
The easiest method
of prevention is to run under-loaded, but this can mean a significant loss of
income. Onboard weighing systems remove the risk of overload fines and ensure
operators always run their vehicle at optimum payload.
Poor load distribution can cause vehicles to tip over during normal driving conditions. This can also occur when vehicles are tipping their load, especially while on unlevel or unstable ground. Systems which use a combination of onboard weighing systems and inclinometers can give advanced warning of an unstable situation.
A typical vehicle
onboard weighing system comprises load cells fitted between the body and chassis
to measure the payload of the body, when it is raised slightly off the chassis.
generally comprise four load cells- two mounted under the tipping gear and one
under each rear hinge.
In certain circumstances the front load cells are replaced by one or more pressure transducers fitted in the hydraulic ram.
Weight indicators can be mounted both in the cab and externally to display teetotal payload. Software is also available that will compute and display the individual axle/bogie weights using information received from the load cells combined with data on the vehicle itself.
In addition to basic displays, audible alarms can be provided and preset to warn of various loading conditions.
There are three
main levels of system available:
weight information only.
and rear load distribution.
Gross vehicle weight
Individual axle weights
Split load/delivery facility.