Engaging hydraulic power
96 iVTInternational.com September 2019
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POCLAIN HYDRAULICS
November 10-16, 2019
Poclain Hydraulics
Hall 16, Stand A17
AGRITECHNICA FLUID POWER
NEW REGULATIONS FOR ON-ROAD BRAKING MEAN HYDRAULIC SYSTEMS HAVE
TO ADAPT TO ENSURE AGRICULTURE VEHICLES COMPLY AND REMAIN SAFE
The new European 2015/68 standard, which
stems from the 167/2013 mother regulation, has
stepped up the requirements for on-road braking. Given
the trend for heavier and faster vehicles, the standard
enforces dual line braking to prevent losing control of the
towed vehicle. The standard is in effect on tractors since
2018 as well as on trailers in certain European countries.
An expert in hydraulic systems for machines travelling
both off and on-road, Poclain Hydraulics has upgraded
its braking offering to comply with the standard. The
system ensures that the braking force is appropriately
distributed between the tractor and the trailer. Compact
and mud-resistant, it is an all-terrain alternative to the
pneumatic technology and is fit for working in the fields.
This new hydraulic braking system is equipped with
an electronic control and available in two versions: The
VBT is dedicated to the tractor, while the EMB is for the
trailer or towed implement. Both are standalone and
compatible with the other solutions on the market.
The VBT system integrates an electronically controlled
valve that modulates the pressure sent to the trailer
braking system based on the force applied to the brake
pedal. It manages the control & supplementary lines of
the trailer whatever the braking system used such as
single, dual line or CUNA for Italy. A single valve fits all
tractor sizes and the braking force is adjusted using the
electronic settings giving OEMs extra design flexibility.
As well as standard compliance, the system offers four
enhancements: ordering the shut-off of the control line
ABOVE: VBT and EMB help
tractor/trailer braking
BELOW: Pressure sent
to the trailer is regulated
should a leak occur, securing the parking brake
test functionality, automatically filling the trailer
accumulator, and synchronizing the tractor and
trailer emergency braking.
In addition to the standard functionalities, the VBT
system can be configured to enable the Hill Start feature,
(automatic parking brake actuation when the tractor
stops on an uphill grade) and the parklock, (automatic
parking brake actuation when the ignition is turned
off). If the tractor runs with a continuously variable
transmission (CVT), the system can be set to brake
the trailer when the tractor decelerates.
Like the VBT, the EMB system integrates a valve with
an embedded electronic control. It is suitable for single,
double or triple axle trailers and can adjust the braking
force according to the trailer weight and the force
applied to the brake pedal. The EMB system stops the
trailer should it break away from the tractor. The system
is easy to integrate as the weight information is given in
the form of an analogic or CAN signal. The trailer
manufacturer can thus choose the sensor used to
transfer the load information.
If the trailer integrates brake actuators whose volume
exceeds 140cc (8.5 cu.in), the system is upgraded with
a pressure amplifier that can charge the accumulator
using the low pressure available on the supplementary
line. Charging is automatic and transparent for
the driver.
With its hydraulic dual line braking systems, Poclain
Hydraulics confirms its commitment to supporting
agricultural vehicle OEMs in marketing machinery that
complies with the current regulations and ensuring
their machines are safe and future-proof. iVT
By Guillaume Besnouin, marketing manager,
Poclain Hydraulics Inc
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