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ON A ROLL WITH HALDEX
Page 62
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Haldex has made its rollover technology more adaptable and simplified its layout. Julian MilInes tried to outfox the equipment.
Here at CM we love a challenge, so when Haldex (in conjunction with International Road Safety Training see pane]) invited us to test its latest trailer antiroll technology we gladly accepted. Haldex was keen to show off its system's significant upgrades, and what better way than with a team of bumbling journalists?
But first, the technology. Its secondgeneration ES+ trailer electronic braking system now has an integrated quick-release valve and two additional service brake ports, which can allow direct connections to the exterior test points. Installation time is reduced thanks to the integral anti-compounding spring brake distribution manifold, eliminating the need for a secondary manifold.
It works by using gentle test pulses to evaluate tyre adhesion and self-calibrate; if a potential rollover situation is detected, the system applies the brakes to slow the vehicle. It can also he connected to a laptop to allow information such as braking reports and service data to be downloaded. And so it was over to Bruntingthorpe test track to find out whether these claims were true.
Hopping on board the pre-prepared Volvo (complete with rollover stabilisers), we were ably assisted by our co-driver, who guided us round the figure-of-eight loop with the intention of tipping over the truck at speed.
The first run was without ESP (electronic stability program), and once sufficient steam was built up the Volvo tipped over without warning, giving way to those lateral g-forces and sending the tanker on to one bank of wheels.And for those of you who haven't rolled a tanker before hopefully the majority there are few indicators before it passes the point of no return, in fact we only realised it had happened once it dropped back into its original upright position.
Then it was time for the ESP run. Like before, we built up ample urge to disturb the rear-but just as the inevitable was about to happen the little blue box took over to rescue the situation. Brakes hissed and speed was dramatically reduced but we were still able to control the vehicle and were aware that we'd pushed it too far.
Of course all this technology comes at a price, but here's some food for thought as well as the obvious risk to life, a vehicle rollover can cost a customer up to £.500,000.0