In cooperation with Paul Nutzfahrzeug, DAF has demonstrated a new function of the PXP additional drive (short for Paul Xtra Power). It is a front-wheel drive, which can be activated by pressing a switch on the instrument panel.
Additional front-wheel drive is currently available for DAF CF and XF tractors in a 4 × 2 chassis configuration and fitted with a PACCAR MX-11 or MX-13 engine. Other types of chassis will follow later this year.
Jak to funguje?
The PXP function has been specially developed for vehicles that have to handle both road and more difficult terrain on construction sites, sand, unpaved roads and hills. Under normal circumstances, all-wheel drive means high maintenance costs and fuel consumption. In addition, this extra traction is only needed in certain situations. And it is for these situations that DAF has introduced the front-wheel drive switching function.
As soon as the vehicle detects a slip of the driven wheels, the PXP function is automatically activated. The more the rear wheels slip, the more power the front wheels provide. The PXP function is available in the first four forward gears and in the first and second reverse gears. From gear 5, or at speeds higher than 20 km per hour, the function deactivates itself.
In order to optionally use the front-wheel drive, the hub of each wheel on the front axle is equipped with a hydraulic motor that generates a torque of at least 6 Nm at a maximum system pressure of 435 bar. The uniqueness of the function lies in the fact that the engines are driven by a hydraulic pump mounted directly on the engine PTO, which saves weight and space on the chassis.
In addition, the hydraulic pump can drive other components: cranes, hook arm systems, stabilizers and loader systems, etc.